JP2016046936A - Motor and compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have a problem that a magnet housed in a slot moves in the circumferential direction and the magnet position varies. SOLUTION: A first magnet accommodating portion 33 is formed in a slot 22 of a rotor so that the width becomes narrower toward an end portion 22b on the outer peripheral surface 20a side of the rotor. The first magnet 40 housed in the first magnet accommodating portion 33 has both side surfaces 41 and 42 of the first magnet 40 sandwiched between both side surfaces of the first magnet accommodating portion 33. [Selection diagram] Fig. 3

Description

  The present invention relates to a motor having a rotor in which a magnet is accommodated and a compressor including the motor.

  As a conventional compressor, a compressor having a compression mechanism and a drive mechanism disposed inside a casing is generally used. The drive mechanism includes a motor having a stator fixed to the inner peripheral surface of the casing and a rotor disposed on the radially inner side. The rotor is formed with a plurality of slots arranged side by side in the circumferential direction, and a magnet is accommodated in each of the plurality of slots.

Japanese Patent Laid-Open No. 11-252839

  In the motor described above, there is a problem that, for example, the magnet accommodated in the slot moves in the circumferential direction due to the centrifugal force generated by the rotation of the rotor, and the magnet position varies. As a result, the vibration of the motor is increased and the noise may be deteriorated.

  As a countermeasure, for example, Patent Document 1 describes a motor that positions a magnet by rotating a rotor before the adhesive is solidified while adhering the magnet with an adhesive inside the slot. However, in this motor, since the magnets are bonded with an adhesive, there is a problem that adhesive waste is clogged in the refrigerant circuit and the cost of the adhesive is high.

  Therefore, an object of the present invention is to provide a motor and a compressor that can fix a magnet in a slot without using an adhesive or reducing the amount of the adhesive used.

  A motor according to a first aspect of the present invention includes a stator and a rotor disposed inside the stator, and the rotor includes a rotor body formed with a plurality of slots arranged in a circumferential direction, and the plurality of the rotors. A first magnet housing portion configured to have a width that decreases toward the end on the outer peripheral surface side of the rotor. The first magnet housed in the first magnet housing portion is characterized in that both side surfaces of the first magnet are sandwiched between both side surfaces of the first magnet housing portion.

  In this motor, for example, due to the centrifugal force generated by the rotation of the rotor, the first magnet accommodated in the first magnet accommodating portion of the slot moves in the direction toward the end on the outer peripheral surface side of the rotor, and the first magnet Since the magnet is sandwiched between both side surfaces of the magnet accommodating portion, the magnet can be firmly fixed in the slot. Therefore, the magnet can be fixed in the slot without using an adhesive or reducing the amount of the adhesive used. Further, in this motor, the first magnet housed in the first magnet housing portion of the slot moves in the direction toward the end portion on the outer peripheral surface side of the rotor, and the first magnet is placed on both side surfaces of the first magnet housing portion. Since it is clamped, the gap between the magnet and the side surface of the slot can be eliminated. Therefore, the magnetic flux of the magnet can be used effectively.

  The motor according to a second aspect is the motor according to the first aspect, wherein the slot has a substantially constant width, and the slot includes a plurality of magnets including the first magnet in the width direction of the slot. The first magnet housing portion is formed between one side surface of the slot and a second magnet different from the first magnet.

  In this motor, the slot width is substantially constant, and a plurality of magnets including the first magnet are accommodated in the slot so as to be stacked in the width direction of the slot. The width can be made constant. Therefore, for example, when the slot is configured so that the width becomes narrower toward the end on the outer peripheral surface side of the rotor, the width of the magnet is not constant, and a part of the magnet is wasted in terms of performance. However, in the configuration of the present invention, it is possible to prevent the useless part from being generated in part of the magnet.

  A motor according to a third aspect is the motor according to the second aspect, wherein the slot is disposed at an end portion on an outer peripheral surface side of the rotor with respect to the second magnet and abuts on an end surface of the second magnet. It has a contact part.

  In this motor, for example, even when the second magnet generates a force toward the end portion on the outer peripheral surface side of the rotor due to the centrifugal force generated by the rotation of the rotor, the second magnet is moved to the outer peripheral surface side of the rotor by the contact portion. Therefore, the magnet can be fixed in the slot more firmly.

  A motor according to a fourth invention is characterized in that, in the motor according to the third invention, the first magnet is arranged outside the second magnet in the width direction of the slot.

  In this motor, the distance between the first magnet and the rotation center of the rotor can be increased in the width direction of the slot as compared with the case where the first magnet is arranged on the inner side of the second magnet. The centrifugal force can be increased. Therefore, since the first magnet moves with a greater force in the direction toward the end portion on the outer peripheral surface side of the rotor, the magnet can be more firmly fixed in the slot.

  A motor according to a fifth invention is characterized in that, in the motor according to the fourth invention, the abutment portion protrudes from an inner side surface in the width direction of the slot.

  In this motor, the contact portion is provided on the inner side surface in the width direction of the slot, which is stronger than the outer surface side in the width direction of the slot. Therefore, the rotor body is deformed when the second magnet presses the contact portion. Can be prevented. In addition, since the magnetic field is less likely to go around the outside of the magnet as compared with the case where the contact portion protrudes from the outer side surface in the width direction of the slot, the proof strength against the reverse magnetic field can be increased.

  A motor according to a sixth aspect is the motor according to the first aspect, wherein the width is substantially constant, and three or more magnets including the first magnet are stacked in the width direction in the slot. The first magnet housing portion is formed between two second magnets different from the first magnet.

  In this motor, the slot width is substantially constant, and since three or more magnets including the first magnet are accommodated in the slot so as to be stacked in the width direction of the slot, the magnet accommodated in the slot The width of can be made constant. Therefore, for example, when the slot is configured so that the width becomes narrower toward the end on the outer peripheral surface side of the rotor, the width of the magnet is not constant, and a part of the magnet is wasted in terms of performance. However, in the configuration of the present invention, it is possible to prevent the useless part from being generated in part of the magnet.

  A compressor according to a seventh aspect is characterized by including the motor according to any one of the first to sixth aspects.

  In this compressor, it is possible to provide a compressor including a motor that can fix the magnet in the slot without using an adhesive or while reducing the amount of the adhesive used.

  As described above, according to the present invention, the following effects can be obtained.

  In the first invention, for example, the centrifugal force generated by the rotation of the rotor causes the first magnet accommodated in the first magnet accommodating portion of the slot to move in the direction toward the end portion on the outer peripheral surface side of the rotor, and the first magnet Is sandwiched between both side surfaces of the first magnet housing portion, so that the magnet can be firmly fixed in the slot. Therefore, the magnet can be fixed in the slot without using an adhesive or reducing the amount of the adhesive used. Further, in this motor, the first magnet housed in the first magnet housing portion of the slot moves in the direction toward the end portion on the outer peripheral surface side of the rotor, and the first magnet is placed on both side surfaces of the first magnet housing portion. Since it is clamped, the gap between the magnet and the side surface of the slot can be eliminated. Therefore, the magnetic flux of the magnet can be used effectively.

  In the second invention, the width of the slot is substantially constant, and a plurality of magnets including the first magnet are accommodated in the slot so as to be stacked in the width direction of the slot. The width of the magnet can be made constant. Therefore, for example, when the slot is configured so that the width becomes narrower toward the end on the outer peripheral surface side of the rotor, the width of the magnet is not constant, and a part of the magnet is wasted in terms of performance. However, in the configuration of the present invention, it is possible to prevent the useless part from being generated in part of the magnet.

  In the third aspect of the invention, for example, even when the second magnet generates a force toward the end on the outer peripheral surface side of the rotor due to the centrifugal force generated by the rotation of the rotor, the second magnet is Since movement to the end portion on the surface side is restricted, the magnet can be more firmly fixed in the slot.

  In the fourth aspect of the invention, the distance between the first magnet and the rotation center of the rotor can be made longer in the width direction of the slot than in the case where the first magnet is arranged inside the second magnet. The centrifugal force generated can be increased. Therefore, since the first magnet moves with a greater force in the direction toward the end portion on the outer peripheral surface side of the rotor, the magnet can be more firmly fixed in the slot.

  In the fifth invention, the contact portion is provided on the inner side surface in the width direction of the slot, which is stronger than the outer surface side in the width direction of the slot. Therefore, the rotor body is deformed by the second magnet pressing the contact portion. Can be prevented. In addition, since the magnetic field is less likely to go around the outside of the magnet as compared with the case where the contact portion protrudes from the outer side surface in the width direction of the slot, the proof strength against the reverse magnetic field can be increased.

  In the sixth invention, the width of the slot is substantially constant, and three or more magnets including the first magnet are accommodated in the slot so as to be stacked in the width direction of the slot. The magnet width can be made constant. Therefore, for example, when the slot is configured so that the width becomes narrower toward the end on the outer peripheral surface side of the rotor, the width of the magnet is not constant, and a part of the magnet is wasted in terms of performance. However, in the configuration of the present invention, it is possible to prevent the useless part from being generated in part of the magnet.

  According to the seventh aspect of the invention, it is possible to provide a compressor including a motor that can fix a magnet in a slot without using an adhesive or while reducing the amount of the adhesive used.

It is a longitudinal section of the compressor concerning a 1st embodiment of the present invention. It is a top view of a rotor main body. (A) is a partially enlarged plan view when only the second magnet is accommodated in the rotor body, and (b) is a partially enlarged plan view of the rotor after motor operation. It is the figure which showed a mode that a magnet was fixed, (a) shows the arrangement | positioning of the magnet at the time of magnet accommodation, (b) shows the arrangement | positioning of the magnet at the time of motor operation, (c) is a motor operation | movement. The arrangement of the later magnets is shown. It is a top view of the rotor main body of the compressor concerning 2nd Embodiment of this invention. (A) is a partially enlarged plan view of the rotor body, and (b) is a partially enlarged plan view of the rotor after motor operation. It is a top view of the rotor main body of the compressor concerning 3rd Embodiment of this invention. (A) is a partially enlarged plan view when two second magnets are accommodated in the rotor body, and (b) is a partially enlarged plan view of the rotor after motor operation. It is a top view of the rotor main body of the compressor concerning 4th Embodiment of this invention. (A) is a partially enlarged plan view when only the second magnet is accommodated in the rotor body, and (b) is a partially enlarged plan view of the rotor after motor operation. It is a top view of the rotor main body of the compressor concerning 5th Embodiment of this invention. (A) is a partially enlarged plan view when only the second magnet is accommodated in the rotor body, and (b) is a partially enlarged plan view of the rotor after motor operation.

  Hereinafter, a compressor according to an embodiment of the present invention will be described with reference to the drawings. In the following, the case where the compressor is arranged in the vertical direction will be described, and the vertical direction in FIG. 1 (that is, the extending direction of the shaft) will be described as the vertical direction.

[First Embodiment]
<Overall configuration of compressor>
First, the compressor 1 concerning 1st Embodiment of this invention is demonstrated, referring FIGS. 1-4. As shown in FIG. 1, the compressor 1 is, for example, a one-cylinder rotary compressor. The compressor 1 includes a hermetic casing 3, a drive mechanism 4 and a compression mechanism 5 that are disposed in the hermetic casing 3. The drive mechanism 4 is disposed above the compression mechanism 5 and drives the compression mechanism 5. The compression mechanism 5 includes a cylinder body 71 having a compression chamber, a front head 72 disposed at the upper end of the cylinder body 71, and a rear head 73 disposed at the lower end of the cylinder body 71. An accumulator 2 is attached to the compressor 1. The refrigerant introduced from the inlet pipe 2 a of the accumulator 2 is introduced from the suction pipe 6 into the sealed casing 3, compressed by the compression mechanism 5, and then discharged from the discharge pipe 7.

<Drive mechanism>
The drive mechanism 4 includes a motor 8 serving as a drive source and a shaft 9 driven by the motor 8. The motor 8 includes a stator 10 that is fixed to the inner peripheral surface of the hermetic casing 3 and a rotor 20 that is disposed on the radially inner side of the stator 10. The shaft 9 is inserted into a through hole 21 a formed in the rotor body 21 of the rotor 20 and is integrated with the rotor 20. In FIG. 1, hatching indicating a cross section of the motor 8 is omitted.

  The stator 10 includes an annular core 11, insulators 12 and 13 disposed on both end surfaces of the core 11, and a coil 14 wound around the core 11 and the insulators 12 and 13. The coil 14 is a so-called concentrated winding type coil, and is wound around each tooth portion (not shown) of the core 11 and the insulators 12 and 13. Note that the winding method of the coil 14 is not limited to concentrated winding, and may be distributed winding.

  As shown in FIGS. 1 to 3, the rotor 20 is accommodated (embedded) in a rotor body 21 in which eight (plurality) slots 22 are arranged side by side in the circumferential direction, and in the plural slots 22. A magnet 23, an end plate member 24 disposed at the upper end portion of the rotor body 21, and an end plate member 25 disposed at the lower end portion of the rotor body 21. The magnet 23 includes a first magnet 40 and a second magnet 50. The end plate members 24 and 25 are fixed to the rotor body 21 by pins. The rotor 20 rotates with the shaft 9 counterclockwise, for example, by an electromagnetic force generated by the current flowing through the coil 14 of the stator 10 and the magnetic flux generated in the rotor body 21.

  The rotor body 21 is a member in which a plurality of thin plates made of a metal material are stacked. Each of the eight slots 22 is a through-hole penetrating the rotor body 21 in the axial direction. As shown in FIG. 2, the eight slots 22 include four slot portions 26. Each slot portion 26 is partitioned into a pair of slots 22 and 22 by a partition 27 provided in the approximate center of the slot portion 26. The four slot portions 26 are arranged at intervals of 90 ° in the circumferential direction around a through hole 21 a formed in the approximate center of the rotor body 21. More specifically, the four slot portions 26 are arranged so that the extension lines of the slot portions 26 adjacent in the circumferential direction are orthogonal to each other.

  As shown in FIG. 2, the width of each slot 22 is substantially constant. The slot 22 includes a magnet accommodating portion 31 that extends in a straight line and has a substantially constant width, and a short-circuit preventing portion 32 that is disposed closer to the outer peripheral surface 20 a of the rotor 20 than the magnet accommodating portion 31. As shown to Fig.3 (a), the magnet accommodating part 31 has the 1st magnet accommodating part 33 (chain line part) in which the 1st magnet 40 is accommodated. The first magnet housing portion 33 is configured such that the width thereof becomes narrower from the end portion 22a on the adjacent slot 22 side toward the end portion 22b on the outer peripheral surface 20a side of the rotor 20 (outside in the longitudinal direction of the magnet housing portion 31). Has been. The first magnet housing portion 33 is formed between the outer surface 28 (one side surface) of the slot 22 and the outer surface 51 of the second magnet 50 housed in the magnet housing portion 31. The second magnet 50 is a magnet different from the first magnet 40, and is disposed along the inner side surface 29 (width side inner surface) of the slot 22. The second magnet 50 is configured such that the width increases from the end 22a on the adjacent slot 22 side toward the end 22b on the outer peripheral surface 20a side of the rotor 20 (the outer side in the longitudinal direction of the magnet housing portion 31). Yes.

  As shown in FIG. 3B, the first magnet 40 and the second magnet 50 are accommodated in the slot 22 so as to be stacked in the width direction of the slot 22. Accordingly, when viewed as a whole of the magnet 23 (the first magnet 40 and the second magnet 50), the width of the magnet 23 is substantially constant.

  The first magnet 40 accommodated in the first magnet accommodating portion 33 is slightly outside the longitudinal direction of the magnet accommodating portion 31 (the end portion 22b) with respect to the second magnet 50 in the state accommodated in the first magnet accommodating portion 33. Side). Accordingly, the first magnet 40 accommodated in the first magnet accommodating portion 33 is in the state accommodated in the first magnet accommodating portion 33, and both side surfaces 41, 42 of the first magnet 40 are on both sides of the first magnet accommodating portion 33. It is sandwiched between the surfaces, that is, between the outer surface 28 of the slot 22 and the outer surface 51 of the second magnet 50.

  The first magnet 40 is obtained by inverting the second magnet 50 by 180 ° in plan view. That is, the first magnet 40 and the second magnet 50 are substantially the same size. Therefore, in this embodiment, the same magnet can be used for the first magnet 40 and the second magnet 50. The first magnet 40 is disposed outside the second magnet 50 in the width direction of the slot 22.

  Each slot 22 is disposed at an end 22 b (on the outer side in the longitudinal direction of the magnet housing portion 31) on the outer peripheral surface 20 a side of the rotor 20 with respect to the second magnet 50, and comes into contact with the end surface 52 of the second magnet 50. have. The abutment portion 60 is a protrusion that protrudes from the inner side surface 29 (width direction inner surface) of the slot 22 toward the outer side in the width direction of the slot 22. The contact portion 60 plays a role of restricting the second magnet 50 from moving outward in the longitudinal direction (on the end 22b side) due to the centrifugal force generated in the second magnet 50 as the rotor 20 rotates.

  In the above description, the configuration of one slot portion 26 (a pair of slots 22 and 22) of the four slot portions 26 and the magnet 23 accommodated in one slot portion 26 (a pair of slots 22 and 22). Although the configuration has been described, the configuration of the other three slot portions 26 and the configuration of the magnets 23 accommodated in the slot portions 26 are the same, and thus the description thereof is omitted.

<Fixing the magnet>
Next, how the magnet 23 is fixed will be described with reference to FIG. 4A shows the arrangement of the magnets 23 when the magnets are accommodated, FIG. 4B shows the arrangement of the magnets 23 during motor operation, and FIG. 4C shows the arrangement of the magnets 23 after motor operation. Yes. As shown in FIG. 4A, when the magnet is accommodated, the first magnet 40 accommodated in the first magnet accommodating portion 33 is between the outer surface 28 of the slot 22 and the outer surface 51 of the second magnet 50. Is not pinched. Therefore, when the magnet is accommodated, the first magnet 40 is in a state of moving slightly in the circumferential direction.

  As shown in FIG. 4B, when the motor 8 is operated, the first magnet 40 has a magnet attracting force and a centrifugal force generated by the rotation of the rotor 20 (force on the outside of the rotor 20 in the radial direction). Will occur. And the 1st magnet 40 moves to a longitudinal direction outer side (end part 22b side) by the circumferential direction component of centrifugal force, and both the side surfaces 41 and 42 of the 1st magnet 40 are the both side surfaces of the 1st magnet accommodating part 33, ie, It is sandwiched between the outer surface 28 of the slot 22 and the outer surface 51 of the second magnet 50. On the other hand, the second magnet 50 receives a force toward the outer side in the longitudinal direction (on the end 22 b side) due to the circumferential component of the centrifugal force, but the second magnet 50 is caused by the contact portion 60 that contacts the end surface 52 of the second magnet 50. Is restricted from moving outward in the longitudinal direction.

  As shown in FIG. 4C, after the operation of the motor 8 is stopped, both side surfaces 41 and 42 of the first magnet 40 are sandwiched between both side surfaces of the first magnet housing portion 33. Will remain. Therefore, the magnet 23 is fixed in the slot 22 without using an adhesive or reducing the amount of adhesive used. Further, since the first magnet 40 is moved and fixed in the direction of receiving the centrifugal force, the magnet position does not vary.

  3 and 4, in order to facilitate understanding of the invention, the magnitude of the displacement of the first magnet 40 with respect to the second magnet 50 is illustrated larger than the actual size, but the second magnet 50 with respect to the second magnet 50 is illustrated. The magnitude of the deviation of one magnet 40 is actually small.

<Characteristics of motor and compressor according to this embodiment>
In the motor 8 of the present embodiment, as shown in FIG. 4B, the first magnet 40 accommodated in the first magnet accommodation portion 33 of the slot 22 is generated by the circumferential component of the centrifugal force generated by the rotation of the rotor 20. The rotor 20 moves in the direction toward the end portion 22b on the outer peripheral surface 20a side, and the both side surfaces 41, 42 of the first magnet 40 are held between the both side surfaces of the first magnet housing portion 33. It can be firmly fixed inside. Therefore, the magnet 23 can be fixed in the slot 22 without using an adhesive for bonding the magnet 23 in the slot 22 or while reducing the amount of the adhesive used. In the motor 8, the first magnet 40 accommodated in the first magnet accommodating portion 33 of the slot 22 moves in the direction toward the end portion 22 b on the outer peripheral surface 20 a side of the rotor 20, and both sides of the first magnet 40 are moved. Since the surfaces 41 and 42 are sandwiched between both side surfaces of the first magnet housing portion 33, a gap between the magnet 23 and the side surface of the slot 22 can be eliminated. Therefore, the magnetic flux of the magnet 23 can be used effectively.

  In the motor 8 of this embodiment, as shown in FIG. 2, the width of the slot 22 is substantially constant, and the first magnet 40 and the second magnet 50 are stacked in the slot 22 in the width direction of the slot 22. Therefore, the entire width of the magnets 23 (first magnet 40 and second magnet 50) accommodated in the slot 22 can be made constant. Therefore, for example, when the slot is configured so that the width becomes narrower toward the end on the outer peripheral surface side of the rotor, the width of the magnet is not constant, and a part of the magnet is wasted in terms of performance. However, in the configuration of the present embodiment, it is possible to prevent a portion that is useless in performance from being generated in a part of the magnet 23.

  Further, in the motor 8 of the present embodiment, as shown in FIG. 4B, the end portion 22 b on the outer peripheral surface 20 a side of the rotor 20 is formed on the second magnet 50 by the circumferential component of the centrifugal force generated by the rotation of the rotor 20. Even when a force toward the outer surface 20a is generated, the contact portion 60 restricts the second magnet 50 from moving in the direction toward the end portion 22b on the outer peripheral surface 20a side of the rotor 20, so that the magnet 23 is made stronger. Can be fixed in the slot 22.

  Further, in the motor 8 of the present embodiment, as shown in FIG. 4B, the first magnet 40 is disposed outside the second magnet 50 in the width direction of the slot 22, so that the first magnet 40 is the second magnet 40. The distance between the first magnet 40 and the rotation center of the rotor 20 can be increased compared to the case where the first magnet 40 and the rotation center of the rotor 20 are disposed inward of the magnet 50 in the width direction of the slot 22. Therefore, the centrifugal force generated in the first magnet 40 can be increased. Accordingly, since the first magnet 40 moves with a greater force in the direction toward the end portion 22 b on the outer peripheral surface 20 a side of the rotor 20, the magnet 23 can be more firmly fixed in the slot 22.

  Further, in the motor 8 of this embodiment, as shown in FIG. 4B, the contact portion 60 is provided on the inner surface 29 side of the slot 22, which has higher rigidity than the outer surface 28 side of the slot 22. The rotor main body 21 can be prevented from being deformed when the end surface 52 of the second magnet 50 presses the contact portion 60 due to the circumferential component of the centrifugal force generated by the rotation of the rotor 20. Further, compared to the case where the contact portion 60 protrudes from the outer surface 28 of the slot 22, the magnetic field is less likely to go around the outside of the magnet 23 (on the end 22 b side), so that the proof strength against the reverse magnetic field can be increased. .

  In the compressor 1 of the present embodiment, the magnet 23 can be fixed in the slot 22 without using an adhesive for bonding the magnet 23 in the slot 22 or reducing the amount of adhesive used. The compressor 1 provided with the motor 8 can be provided.

[Second Embodiment]
Next, the compressor concerning 2nd Embodiment of this invention is demonstrated, referring FIG.5 and FIG.6. In the compressor 1 according to the first embodiment described above, the case where the magnet 23 includes two magnets (the first magnet 40 and the second magnet 50) and the width of the slot 22 is constant has been described. The compressor of the embodiment is different from the first embodiment in that the magnet is composed of only one magnet (first magnet 140) and that the width of the slot 122 is not constant. In addition, in this embodiment, about the thing which has the structure similar to the above-mentioned 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted suitably.

  As shown in FIGS. 5 and 6, each slot 122 includes a first magnet housing part 133 in which the first magnet 140 is housed, and a short circuit prevention that is disposed on the outer peripheral surface 20 a of the rotor more than the first magnet housing part 133. Part 132. As shown in FIG. 6A, the first magnet housing portion 133 is formed between the outer side surface 128 and the inner side surface 129 of the slot 122. And this 1st magnet accommodating part 133 becomes narrow as it goes to the edge part 122b (the longitudinal direction outer side of the 1st magnet accommodating part 133) of the outer peripheral surface 20a side of the rotor from the edge part 122a by the side of the adjacent slot 122 side. It is configured as follows.

  More specifically, as the first magnet housing portion 133 moves toward the end 122b on the outer peripheral surface 20a side of the rotor, the inner surface 129 of the first magnet housing portion 133 extends in the extending direction of the slot portion 126 (FIG. 6A). In the direction of the arrow).

  As shown in FIG. 6B, the first magnet 140 housed in the first magnet housing portion 133 has both side surfaces 141 and 142 of the first magnet 140 in a state of being housed in the first magnet housing portion 133. It is sandwiched between both side surfaces of the first magnet housing portion 133, that is, between the outer side surface 128 and the inner side surface 129 of the slot 122.

<Fixing the magnet>
When the magnet is housed, the first magnet 140 housed in the first magnet housing portion 133 is not sandwiched between the outer surface 128 and the inner surface 129 of the slot 122. Accordingly, when the magnet is accommodated, the first magnet 140 is in a state of moving slightly in the circumferential direction.

  As shown in FIG. 6B, after the motor is operated, the first magnet 140 is moved outward in the longitudinal direction (end portion) by a circumferential component of centrifugal force (force radially outward of the rotor) generated by rotation of the rotor. 122b side). Accordingly, after the motor is operated, both side surfaces 141 and 142 of the first magnet 140 are sandwiched between both side surfaces of the first magnet housing portion 133.

  In FIG. 6, in order to facilitate understanding of the invention, the magnitude of the deviation of the first magnet 140 is shown larger than the actual magnitude, but the magnitude of the deviation of the first magnet 140 is actually slightly smaller. It is.

<Characteristics of motor according to this embodiment>
In this motor, the magnet can be firmly fixed in the slot 122 by forming the slot 122 so that the width of the slot 122 becomes narrower toward the end 122b on the outer peripheral surface 20a side of the rotor. Therefore, even when the magnet cannot be stacked in the width direction of the slot due to the narrow width of the slot 122, the amount of adhesive used is not used without using an adhesive for bonding the magnet into the slot. The magnet can be fixed in the slot while reducing the above-mentioned. Further, in this motor, the first magnet 140 housed in the first magnet housing portion 133 of the slot 122 moves in the direction toward the end 122b on the outer peripheral surface 20a side of the rotor, and both side surfaces 141 of the first magnet 140 are moved. , 142 are sandwiched between both side surfaces of the first magnet housing portion 133, so that a gap between the magnet and the slot 122 can be eliminated in the width direction of the slot 122. Therefore, the magnetic flux of the magnet can be used effectively.

[Third Embodiment]
Next, the compressor concerning 3rd Embodiment of this invention is demonstrated, referring FIG.7 and FIG.8. In the compressor 1 according to the first embodiment described above, the case where the magnet 23 includes two magnets (the first magnet 40 and the second magnet 50) has been described. However, in the compressor according to the present embodiment, there are three magnets. It is different from the first embodiment in that it is composed of magnets (first magnet 240 and two second magnets 250, 253). In addition, in this embodiment, about the thing which has the structure similar to the above-mentioned 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted suitably.

  As shown in FIG. 7, the width of each slot 222 is substantially constant. The slot 222 includes a magnet accommodating portion 231 that extends in a straight line and has a substantially constant width, and a short-circuit preventing portion 232 that is disposed closer to the outer peripheral surface 20 a of the rotor than the magnet accommodating portion 231. As shown in FIG. 8A, the magnet housing part 231 has a first magnet housing part 233 (chain line part) in which the first magnet 240 is housed. The first magnet housing portion 233 is configured to have a width that decreases from an end portion 222a on the adjacent slot 222 side toward an end portion 222b on the outer peripheral surface 20a side of the rotor (on the outside in the longitudinal direction of the magnet housing portion 231). ing. The first magnet housing portion 233 is formed between the two second magnets 250 and 253. The second magnet 250 is a magnet different from the first magnet 240, and is disposed along the inner side surface 229 (width side inner surface) of the slot 222. This 2nd magnet 250 is comprised so that a width | variety may become large as it goes to the edge part 222b by the side of the outer peripheral surface 20a of a rotor. The second magnet 253 is a magnet different from the first magnet 240 and is disposed along the outer surface 228 (width direction outer surface) of the slot 222. This 2nd magnet 253 is comprised so that a width | variety may become large as it goes to the edge part 222b by the side of the outer peripheral surface 20a of a rotor. Therefore, unlike the above-described first and second embodiments, the first magnet housing portion 233 has opposite side surfaces of the first magnet housing portion 233 that are opposite to each other with respect to the extending direction of the slot portion 226 (directions approaching each other). ).

  As shown in FIG. 8B, the first magnet 240 and the two second magnets 250 and 253 are accommodated in the slot 222 so as to be stacked in the width direction of the slot 222. Accordingly, when the magnets (the first magnet 240 and the two second magnets 250 and 253) are viewed as a whole, the width of the magnet is substantially constant.

  The first magnet 240 accommodated in the first magnet accommodating portion 233 is slightly outside the longitudinal direction of the magnet accommodating portion 231 (the end portion 222b) with respect to the second magnet 250 in the state accommodated in the first magnet accommodating portion 233. Side). Accordingly, the first magnet 240 accommodated in the first magnet accommodating portion 233 is configured so that both side surfaces of the first magnet 240 are arranged on both side surfaces of the first magnet accommodating portion 233 in the state accommodated in the first magnet accommodating portion 233. Between the two second magnets 250 and 253.

  Each slot 222 is disposed on the end portion 222b on the outer peripheral surface 20a side of the rotor from the second magnets 250 and 253 (on the outer side in the longitudinal direction of the magnet housing portion 231), and contacts the end surfaces 252 and 255 of the second magnets 250 and 253. It has the contact parts 261 and 262 which touch. The contact portion 261 is a protrusion that protrudes from the inner side surface 229 of the slot 222 (the inner side surface in the width direction) toward the outer side in the width direction of the slot 222. The contact portion 262 is a protrusion that protrudes from the outer surface 228 (width direction outer surface) of the slot 222 toward the width direction inner side of the slot 222. The contact portions 261 and 262 move the second magnets 250 and 253 outward in the longitudinal direction (on the end 222b side) due to a circumferential component of centrifugal force generated in the second magnets 250 and 253 when the rotor rotates. It plays the role of regulating

<Fixing the magnet>
At the time of magnet accommodation, the first magnet 240 accommodated in the first magnet accommodation portion 233 is not sandwiched between the two second magnets 250 and 253. Therefore, the first magnet 240 is in a state of moving slightly in the circumferential direction when the magnet is housed.

  As shown in FIG. 8B, after the motor is operated, the first magnet 240 is moved outward in the longitudinal direction (end portion) by the circumferential component of the centrifugal force (force radially outward of the rotor) generated by the rotation of the rotor. 222b side). Therefore, both sides of the first magnet 240 are sandwiched between both sides of the first magnet housing part 233 after the motor is operated.

  In FIG. 8, in order to facilitate understanding of the invention, the magnitude of the displacement of the first magnet 240 with respect to the two second magnets 250 and 253 is illustrated to be larger than actual, but the two second magnets are illustrated. The magnitude of the displacement of the first magnet 240 with respect to 250 and 253 is actually slight.

<Characteristics of motor according to this embodiment>
In this motor, since both side surfaces of the first magnet housing part 233 are inclined in directions opposite to each other (directions approaching each other) with respect to the extending direction of the slot part 226, the magnet can be fixed more firmly in the slot. In this motor, the first magnet 240 housed in the first magnet housing portion 233 of the slot 222 moves in the direction toward the end portion 222b on the outer peripheral surface 20a side of the rotor, and both side surfaces of the first magnet 240 are moved. Since the first magnet accommodating portion 233 is sandwiched between both side surfaces, the gap between the magnet and the slot 222 can be eliminated in the width direction of the slot 222. Therefore, the magnetic flux of the magnet can be used effectively.

[Fourth Embodiment]
Next, the compressor concerning 4th Embodiment of this invention is demonstrated, referring FIG.9 and FIG.10. In the compressor 1 according to the first embodiment described above, the case where the partition 27 is provided at the approximate center of the slot portion 26 has been described. However, in the compressor according to the present embodiment, there is no partition at the approximate center of the slot portion 326, The slot portion 326 is different from the first embodiment in that the slot portion 326 is inclined toward the center of the rotor from the end toward the center in the circumferential direction. In addition, in this embodiment, about the thing which has the structure similar to the above-mentioned 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted suitably.

  As shown in FIGS. 9 and 10, the slot 322 of the slot portion 326 includes two magnet housing portions 331 and two short-circuit preventing portions 332 disposed on the outer peripheral surface 20 a of the rotor rather than the respective magnet housing portions 331. have. As shown in FIG. 10A, the first magnet housing portion 333 is formed between the outer surface 328 of the slot 322 and the second magnet 350. And this 1st magnet accommodating part 333 becomes so that a width | variety becomes narrow as it goes to the edge part 322b (the longitudinal direction outer side of the 1st magnet accommodating part 333) of the rotor outer peripheral surface 20a side from the approximate center side of the adjacent slot 322. It is configured.

  As shown in FIG. 10B, the first magnet 340 accommodated in the first magnet accommodating portion 333 is configured such that both side surfaces of the first magnet 340 are the first magnets in the state accommodated in the first magnet accommodating portion 333. It is sandwiched between both side surfaces of the accommodating portion 333, that is, between the outer surface 328 of the slot 322 and the second magnet 350.

<Fixing the magnet>
At the time of magnet accommodation, the first magnet 340 accommodated in the first magnet accommodation portion 333 is not sandwiched between the outer surface 328 of the slot 322 and the second magnet 350. Therefore, the first magnet 340 is slightly moved in the circumferential direction when the magnet is accommodated.

  As shown in FIG. 10B, after the motor is operated, the first magnet 340 is moved outward in the longitudinal direction (end portion) by a circumferential component of centrifugal force (force radially outward of the rotor) generated by rotation of the rotor. 322b side). Therefore, both sides of the first magnet 340 are sandwiched between both sides of the first magnet housing part 333 after the motor is operated. On the other hand, like the first magnet 340, the second magnet 350 receives a force directed toward the outside in the longitudinal direction (on the end 322 b side) due to the circumferential component of the centrifugal force, but is in contact with the end surface 352 of the second magnet 350. The contact portion 360 restricts the second magnet 350 from moving outward in the longitudinal direction.

  In FIG. 10, in order to facilitate understanding of the invention, the magnitude of the deviation of the first magnet 340 is shown larger than the actual magnitude, but the magnitude of the deviation of the first magnet 340 is actually slightly smaller. It is.

[Fifth Embodiment]
Next, the compressor concerning 5th Embodiment of this invention is demonstrated, referring FIG.11 and FIG.12. In the compressor 1 according to the above-described first embodiment, the case where the first magnet 40 is disposed outside the second magnet 50 in the width direction of the slot 22 has been described, but in the present embodiment, the first magnet 440 is provided. The case where it arrange | positions in the radial inside rather than the 2nd magnet 450 is demonstrated.

  As shown in FIG. 11, each slot 422 has a substantially constant width. The slot 422 includes a magnet accommodating portion 431 having a substantially constant width extending in a straight line, and a short-circuit preventing portion 432 disposed closer to the outer peripheral surface 20a of the rotor than the magnet accommodating portion 431. As shown in FIG. 11, the magnet housing portion 431 has a first magnet housing portion 433 (a chain line portion) in which the first magnet 440 is housed. The first magnet housing portion 433 is configured to have a width that decreases from an end portion 422a on the adjacent slot 422 side toward an end portion 422b on the outer peripheral surface 20a side of the rotor (the outside in the longitudinal direction of the magnet housing portion 431). ing. The first magnet housing portion 433 is formed between the inner side surface 429 (one side surface) of the slot 422 and the inner side surface 451 of the second magnet 450 housed in the magnet housing portion 431. The second magnet 450 is a magnet different from the first magnet 440, and is disposed along the outer surface 428 (width direction outer surface) of the slot 422. The second magnet 450 is configured such that the width increases from the end 422a on the adjacent slot 422 side toward the end 422b on the outer peripheral surface 20a side of the rotor (on the outside in the longitudinal direction of the magnet housing portion 431). .

  As shown in FIG. 12B, the first magnet 440 and the second magnet 450 are accommodated in the slot 422 so as to be stacked in the width direction of the slot 422. Therefore, when viewed as a whole of the magnets (the first magnet 440 and the second magnet 450), the width of the magnet is substantially constant.

  The first magnet 440 accommodated in the first magnet accommodating portion 433 is slightly outside the longitudinal direction of the magnet accommodating portion 431 (the end portion 422b) with respect to the second magnet 450 in the state accommodated in the first magnet accommodating portion 433. Side). Therefore, the first magnet 440 accommodated in the first magnet accommodating portion 433 is configured such that both side surfaces of the first magnet 440 are between both side surfaces of the first magnet accommodating portion 433 in the state accommodated in the first magnet accommodating portion 433. That is, it is sandwiched between the inner surface 429 of the slot 422 and the inner surface 451 of the second magnet 50.

  The first magnet 440 is obtained by inverting the second magnet 450 by 180 ° in plan view. That is, the first magnet 440 and the second magnet 450 are substantially the same size. Therefore, in this embodiment, the same magnet can be used for the first magnet 440 and the second magnet 450. In addition, the first magnet 440 is disposed on the inner side of the second magnet 450 in the width direction of the slot 422.

  Each slot 422 is disposed at an end 422b (on the outer side in the longitudinal direction of the magnet housing portion 431) on the outer peripheral surface 20a side of the rotor from the second magnet 450, and has a contact portion 460 that contacts the end surface 452 of the second magnet 450. Have. The contact portion 460 is a protrusion that protrudes from the outer surface 428 (width direction outer surface) of the slot 422 toward the width direction inner side of the slot 422. The contact portion 460 plays a role of restricting the second magnet 450 from moving outward in the longitudinal direction (on the end 422b side) due to the centrifugal force generated in the second magnet 450 as the rotor rotates.

<Fixing the magnet>
At the time of magnet accommodation, the first magnet 440 accommodated in the first magnet accommodation portion 433 is not sandwiched between the inner surface 429 of the slot 422 and the second magnet 450. Therefore, the first magnet 440 is in a state of moving slightly in the circumferential direction when the magnet is accommodated.

  As shown in FIG. 10B, after the motor is operated, the first magnet 440 is moved outward in the longitudinal direction (end portion) by a circumferential component of centrifugal force (force radially outward of the rotor) generated by rotation of the rotor. 422b side). Therefore, after the motor is operated, both side surfaces of the first magnet 440 are held between both side surfaces of the first magnet housing portion 433. On the other hand, as with the first magnet 440, the second magnet 450 receives a force toward the outside in the longitudinal direction (on the end 422b side) due to the circumferential component of the centrifugal force, but is in contact with the end surface 452 of the second magnet 450. The contact portion 460 restricts the second magnet 450 from moving outward in the longitudinal direction.

  In FIG. 12, in order to facilitate understanding of the invention, the magnitude of the deviation of the first magnet 440 is shown larger than the actual magnitude, but the magnitude of the deviation of the first magnet 440 is actually slightly smaller. It is.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

[Modification]
In the above-described embodiment, the case where there are four or eight slots and all the slots have the first magnet housing portion has been described. However, the number of slots is not limited to this, and the number of slots is not limited to this. At least one should just have a magnet accommodating part.

  In the first embodiment described above, the width of the slot is substantially constant, and in the slit, two magnets are accommodated so as to be stacked in the width direction of the slot. For example, in the second embodiment described above, As shown, the width of the slot may not be constant, and the number of magnets may be one, three, or four as shown in the second and third embodiments described above, for example. It may be the above.

  In the first embodiment described above, the first magnet is arranged outside the second magnet in the width direction of the slot. For example, as shown in the fifth embodiment described above, the first magnet is arranged in the width direction of the slot. A magnet may be arrange | positioned inside a 2nd magnet.

  In the first embodiment described above, the slot has the contact portion that contacts the end surface of the second magnet, but the contact portion may not be provided.

  In the first embodiment described above, the contact portion protrudes outward in the width direction from the inner circumferential surface of the slot in the width direction. You may protrude in the width direction inner side from the surface.

  In the above-described embodiment, the centrifugal force generated by the rotation of the rotor causes the first magnet accommodated in the first magnet accommodating portion to move to the end portion on the outer peripheral surface side of the rotor, and both side surfaces of the first magnet are first. Although the case where it clamped by the both sides | surfaces of a magnet accommodating part was demonstrated, the method of clamping both the side surfaces of a 1st magnet to the both sides | surfaces of a 1st magnet accommodating part is not restricted to this. For example, at the time of manufacturing the motor, the both sides of the first magnet may be sandwiched between the both sides of the first magnet housing portion by moving the first magnet to the end on the outer peripheral surface side of the rotor with a jig or the like. .

  In the first embodiment described above, the case where the first magnet is disposed between the outer side surface (one side surface) of the slot and the second magnet has been described. For example, as shown in the second embodiment, the first magnet May be disposed between both sides of the slot, or may be disposed between two magnets, for example, as shown in the third embodiment, or, for example, as shown in the fifth embodiment. You may arrange | position between an inner surface (one side surface) and a 2nd magnet.

  In the above-described embodiment, the case where the motor and the compressor are arranged vertically has been described, but the motor and the compressor may be arranged horizontally.

  In the above-described embodiment, the case where the compressor is a rotary compressor has been described. However, the compressor may be another compressor such as a scroll type or a screw type.

  In the above-described embodiment, as shown in FIGS. 2, 5, 7, and 11, the case where the partition 27 is provided between one slot portion has been described, but the partition between the slot portions is not necessary. Good.

  By utilizing the present invention, the magnet can be fixed in the slot without using an adhesive or while reducing the amount of adhesive used.

10 Stator 20 Rotor 21 Rotor body 22, 122, 222, 322, 422 Slot 22b, 122b, 222b, 322b, 422b End 23 Magnet 33, 133, 233, 333, 433 First magnet housing portion 40, 140, 240, 340, 440 First magnet 41, 42, 141, 142 Both side surfaces 50, 250, 253, 350, 450 Second magnet 60, 261, 262, 360, 460 Contact portion

Claims (7)

A stator, and a rotor disposed inside the stator,
The rotor is
A rotor body formed with a plurality of slots arranged side by side in the circumferential direction;
And a magnet accommodated in each of the plurality of slots,
In the slot,
A first magnet housing portion is formed so that the width becomes narrower toward the end portion on the outer peripheral surface side of the rotor;
The motor, wherein the first magnet housed in the first magnet housing portion has both side surfaces of the first magnet sandwiched between both side surfaces of the first magnet housing portion. The slot has a substantially constant width,
A plurality of magnets including the first magnet are accommodated in the slot so as to be stacked in the width direction of the slot,
The motor according to claim 1, wherein the first magnet housing portion is formed between one side surface of the slot and a second magnet different from the first magnet. The slot is
The motor according to claim 2, further comprising an abutting portion that is disposed at an end portion on an outer peripheral surface side of the rotor with respect to the second magnet and abuts on an end surface of the second magnet.   The motor according to claim 3, wherein the first magnet is disposed outside the second magnet in the width direction of the slot.   The motor according to claim 4, wherein the contact portion protrudes from the inner surface in the width direction of the slot. The slot has a substantially constant width,
In the slot, three or more magnets including the first magnet are accommodated so as to be stacked in the width direction,
The motor according to claim 1, wherein the first magnet housing portion is formed between two second magnets different from the first magnet.   A compressor comprising the motor according to claim 1.

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