JP2006034057A - Toroidal coil linear motor, cylinder compressor and pump using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive toroidal coil linear motor with a simple configuration without generating side pull. <P>SOLUTION: The toroidal coil linear motor includes an axis 41 slidably arranged to a housing, a cylindrical element 42 fixed to the axis, and an armature 43 fixed to the housing opposite from the outside around the outer peripheral surface of the cylindrical element through an air gap. The cylindrical element 42 has toroidal magnetic teeth 42a, 42b on both axial ends, and the armature 43 has a toroidal coil 44, a pair of armature yokes 45a, 45b that hold the toroidal coil and a cylindrical yoke 46 that covers the outer periphery of the armature yokes. The armature yokes 45a, 45b have, on its inner surface, a pair of permanent magnets 47a, 47b in N pole and S pole that can be disposed opposite to each toroidal magnetic teeth 42a, 42b. When an AC current is made to flow in the toroidal coil 44, the cylindrical element 42 and the axis 41 horizontally reciprocate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a linear motor that can be used for various types of industrial equipment, and more particularly to an annular coil linear motor that uses an annular coil as an armature. The present invention also relates to a cylinder type compressor and pump using such a linear motor.

A linear stepping motor as a conventional annular linear motor is disclosed in Patent Document 1, for example.
FIG. 4 of Patent Document 1 discloses a configuration in which a movable body 4 including wheels 3 moves linearly on a linear rail 1 on which a large number of fixed teeth 2 are formed. Each of the core portions 8a and 8b of the movable body 4 includes a plurality of small teeth 9 that face the fixed tooth 2 from one direction, and allows current to flow through the coils 28 and 29 wound around each core portion in a predetermined sequence. Thus, the movable body 4 can be linearly moved by the electromagnetic force acting between the fixed teeth 2 and the small teeth 9.

Japanese Patent Laid-Open No. 10-191619 FIG.

However, since the linear stepping motor disclosed in Patent Document 1 is a type in which the rail 1 as a stator and the movable body 4 (moving element) face each other, in addition to the electromagnetic force acting in the moving direction, An electromagnetic attractive force called “side pull” (that is, an electromagnetic force in a direction in which the rail and the movable body are brought close to each other) acts also in a direction perpendicular to the moving direction.
For this reason, in such a single-sided linear stepping motor, a mechanism for receiving the side pull such as the guide mechanism of the movable body 4 such as the wheel 3 so as not to interfere with the linear movement is necessary, and the mechanism is complicated. There is a problem that the cost is high.

  On the other hand, as shown in FIG. 12, an annular coil type linear stepping motor in which a rod-like moving element 2 is arranged in a cylindrical stator 1 is also known. The stator 1 is configured by arranging two sets of unit stators 3 and 4 in parallel in the axial direction with an embedded permanent magnet 5 interposed therebetween. The unit stators 3 and 4 include coils 3a and 4a that are wound around the axis in an annular shape, and armature yokes 3b and 4b that hold the coils. In each unit stator, annular magnetic teeth 3c, 4c are formed on the inner peripheral surface so as to alternately repeat irregularities along the axial direction, and the movable element 2 has an annular shape that can be opposed to the annular magnetic teeth 3c, 4c. Many magnetic teeth 2a are formed.

  In the configuration of FIG. 12, the movable element 2 can be moved linearly by alternately passing current through the coils 3a and 4a. Since the mover 2 faces the stator in the entire circumferential direction, no side pull occurs. However, since the annular coil linear stepping motor shown in FIG. 12 is a polyphase type, the structure is complicated, and there is a problem that it is expensive to use as a drive source for a compressor.

By the way, the structure as shown in FIG. 13 is conventionally known as a compressor for an air conditioner of an automobile.
The compressor of FIG. 13 reciprocates a piston by the driving force of an automobile engine transmitted via an electromagnetic clutch. The electromagnetic clutch includes a driving wheel 10 that rotates with the driving force of the engine, and a driven wheel 12 that is pressed against the driving wheel 10 by energizing the excitation coil 11 and transmits the driving force. When the driven wheel 12 rotates, the disk 13 tilted and fixed to the rotation axis of the driven wheel 12 rotates. Grooves are formed in the disk 13 in the circumferential direction, and a plurality of hard balls 14 are fitted in the grooves. A piston 16 that can reciprocate in the cylinder 15 is attached to each of the hard spheres 14.
When the disk 13 rotates, the hard sphere 14 follows the displacement of the disk 13 along the groove, causing the piston 16 to reciprocate within the cylinder 15. The cylinder 15 is provided with intake and exhaust ducts, and compressed gas is supplied to an evaporator (not shown).

  In the configuration of FIG. 13, the compression ratio can be changed by arbitrarily setting the tilt angle of the disk 13, but the angle is set at the time of manufacture for each product and cannot be changed during use. Further, since it involves a complicated wobble operation, there is a problem that the stress applied to the mechanism is large and the life is relatively short. If the compressor drive source is a linear motor and the piston that reciprocates in a single cylinder is driven by a single linear stepping motor, the compression ratio can be easily changed even during use, and the stress on the mechanism Can be reduced. However, simply connecting a linear stepping motor to the compressor piston requires separate cylinder space and linear stepping motor space, and a mechanism for guiding the movable part in the linear stepping motor is required. Cannot be made compact.

The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide an annular coil single-phase linear motor that does not generate a side pull and has a simple configuration and low cost. .
Another object of the present invention is to provide a compact cylinder compressor and pump using an annular coil single phase linear motor that achieves the above object.

  An annular coil linear single-phase motor according to the present invention includes an armature configured by holding one annular coil with a pair of armature yokes made of a magnetic material, and an air gap in a radial direction with respect to the armature. A cylindrical member that has a magnetic structure facing each other and is linearly movable relative to the armature along the axial direction, a shaft that supports one of the armature and the cylindrical member, and a shaft that supports the shaft And the other of the armature and the cylindrical member is concentrically fixed, and each of the pair of armature yokes has an axial N on the surface facing the magnetic body structure of the cylindrical member. A pair of annular magnets alternately magnetized to the poles and the S poles are provided, and the armature and the magnetic force acting between the armature and the magnetic structure formed on the cylindrical member by energizing the annular coil One of the cylindrical members along the axis Relatively linearly moved, or the one with the shaft of the armature and the cylindrical member so as to be integrated, characterized in that for relatively reciprocated with respect to the housing against.

The ring-coil single-phase linear motor of the present invention can be classified into the following three types when focusing on the structure constituting the magnetic circuit of the electric yoke and the cylindrical member.
(1) Each armature yoke has a single annular magnetic tooth, and the magnetic structure of the cylindrical member is a pair of N and S pole permanent magnets that can face one annular magnetic tooth, and the other annular magnet. A pair of N and S pole permanent magnets that can be opposed to the magnetic teeth. When one of the permanent magnets faces the N pole of the permanent magnet, the other annular magnetic tooth is permanent. A type configured to face the south pole of the magnet,
(2) The magnetic structure of the cylindrical member includes a pair of annular magnetic teeth, and one armature yoke includes a pair of N and S pole permanent magnets that can face the one annular magnetic tooth, The other armature yoke is provided with a pair of N and S-pole annular permanent magnets that can face the other annular magnetic teeth, and one of these permanent magnets faces the N pole of the permanent magnet. When the other annular magnetic teeth are configured to face the south pole of the permanent magnet,
(3) Each armature yoke has a single annular magnetic tooth, and the magnetic structure of the cylindrical member includes a permanent magnet magnetized in the N and S poles along the axial direction, and the permanent magnet in the axial direction. A pair of unit movers comprising a pair of magnetic poles sandwiched from both sides are provided, and these permanent magnets are arranged such that the directions of the magnetic poles are opposite to each other, and one annular magnetic tooth is in contact with the N pole of the permanent magnet And the other annular magnetic tooth is configured to face the magnetic pole in contact with the S pole of the permanent magnet.

In any of the above types, the following four types can be considered as to which member is fixed and which member is moved.
(a) The cylindrical member is supported by the shaft, and the armature is fixed to the housing through the air gap on the outer periphery of the cylindrical member, the shaft is fixed to the housing, and the cylindrical member is guided by the shaft. A linear movement relative to the housing,
(b) The cylindrical member is supported by the shaft, and the armature is fixed to the housing via an air gap on the outer periphery of the cylindrical member, and the shaft is supported so as to be linearly movable in the axial direction with respect to the housing. A type in which the cylindrical member moves linearly relative to the housing integrally with the shaft,
(c) The armature is supported by the shaft, the cylindrical member is fixed to the housing via the air gap on the outer periphery of the armature, the shaft is fixed to the housing, and the armature is the housing with the shaft as a guide. A linear movement relative to
(d) The armature is supported by the shaft, the cylindrical member is fixed to the housing via the air gap on the outer periphery of the armature, and the shaft is supported so as to be linearly movable in the axial direction with respect to the housing. The child moves linearly relative to the housing integrally with the shaft.

  These forms (a) to (d) can be combined with any of the types (1), (2), and (3). For example, in the case of the form (a), “relatively linearly moving” includes a case where the housing is fixed and the cylindrical member moves, and a case where the cylindrical member is fixed and the housing side moves. .

  The cylinder type compressor or pump of the present invention uses the above annular coil linear motor, fixes the shaft and the cylindrical member so as to move linearly integrally, and moves in the cylinder along the axial direction at both ends of the shaft. It can be configured by attaching a piston. By energizing the annular coil, the piston can be reciprocated to compress and output the air or liquid in the cylinder. In this case, it is desirable to resonate the piston by connecting the piston to the cylinder by a spring, and considering the spring constant of the spring and the inertia of the moving body, and adjusting the input AC frequency to the resonance frequency.

According to the annular coil type single-phase linear motor of the present invention, the structure can be simplified from the multiphase type. Moreover, the part used as a movable element can be vibrated by sending alternating current through a single phase type annular coil. When used as a drive source for a compressor or pump, the single-phase type is more efficient than the multi-phase type, and the cost can be reduced.
The reason is that, in the case of the polyphase type, the combined thrust when a plurality of phases are excited does not take the form of the sum of the polyphase type. For example, in the two-phase system, in the two-phase excitation, the output is √2 times the sum of the two phases, and the efficiency is √2 / 2, that is, about 70%. Thus, since the single-phase method is not the synthesis of the output, it is more efficient than the two-phase method.

  Moreover, according to the cylinder type compressor or pump of the present invention, the cylinder of the compressor can be used as a bearing by connecting the shaft fixed to the cylindrical member to the piston, and no guide mechanism is required on the linear motor side. As a result, the entire compressor can be made compact.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an annular coil type single-phase linear motor and a cylinder type compressor according to the present invention will be described below based on examples shown below.

1 is a cross-sectional view of an annular coil linear motor according to a first embodiment of the present invention, and FIG. 2 is a front view of the motor of FIG.
The motor 40 according to the first embodiment includes a shaft 41 that is linearly reciprocable with respect to a housing (not shown), a cylindrical member 42 fixed to the shaft 41, and an outer peripheral surface of the cylindrical member 42. The armature 43 is fixed to a housing (not shown) so as to face the outside through an air gap. The cylindrical member 42 is formed of a magnetic material, and includes annular magnetic teeth 42a and 42b at both ends in the axial direction, and is formed in a pincushion shape as a whole. In addition, what is necessary is just to comprise similarly to the case of FIG. 3, FIG. 4 mentioned later as a housing in the structure of FIG.

  The armature 43 is a single unit armature. The armature yoke 45a covers the outer periphery of the annular coil 44, a pair of cylindrical armature yokes 45a and 45b with a flange that sandwich the annular coil 44, and the annular coil 44. , 45b, and a cylindrical yoke 46 connected to 45b. Further, the inner peripheral side of each armature yoke 45a, 45b is formed to wrap around the inner side of the annular coil 44, and the inner peripheral side of one armature yoke 45a can face one annular magnetic tooth 42a. The N pole magnetized in the radial direction over the entire inner periphery, and the S pole is magnetized in the same manner at a position distant in the axial direction, and a pair of N and S pole permanent magnets 47a is provided, On the inner peripheral side of the armature yoke 45b, there is provided a pair of N and S pole permanent magnets 47b that can face the other annular magnetic teeth 42b. These permanent magnets 47a and 47b are arranged such that when one annular magnetic tooth faces the north pole of the permanent magnet, the other annular magnetic tooth faces the south pole of the permanent magnet.

When current flows through the annular coil 44 of the motor 40 of the first embodiment in a predetermined direction, the N polarity of the permanent magnet 47a is increased, the S polarity is decreased, the S polarity of the permanent magnet 47b is increased, and the N polarity is decreased. For this reason, the annular magnetic teeth 42a and 42b of the cylindrical member 42 are attracted and opposed to the north pole of the permanent magnet 47a and the south pole of the permanent magnet 47b.
Further, when a current flows through the annular coil 44 in the reverse direction, the N polarity of the permanent magnet 47a is weakened, the S polarity is strengthened, the S polarity of the permanent magnet 47b is weakened, and the N polarity is strengthened. For this reason, the annular magnetic teeth 42a and 42b of the cylindrical member 42 are attracted to the south pole of the permanent magnet 47a and the north pole of the permanent magnet 47b and move to the right from the state shown in FIG. Therefore, when an alternating current is passed through the annular coil 44, the cylindrical member 42 and the shaft 41 reciprocate (vibrate) left and right. That is, the motor of the first embodiment is the above-mentioned type (2) in terms of magnetic circuit, and is structurally in the form (b) above.

  3 and 4 are cross-sectional views showing one operating state of a cylinder compressor for an air conditioner using the motor 40 of the first embodiment. In this compressor, a first cylinder 51 and a second cylinder 52 are attached to both sides in the axial direction with the motor 40 of the first embodiment sandwiched in the center.

  In this example, the shaft 41 of the motor 40 and the cylindrical member 42 are fixed so as to move linearly integrally (that is, in the same manner as in the form (b) in the first embodiment). 1. First and second pistons 53 and 54 moving in the second cylinders 51 and 52 are attached. The first and second cylinders 51 and 52 are provided with intake ports 51a and 52a and exhaust ports 51b and 52b, respectively. Each intake port and exhaust port are provided with valves (not shown) to control the inflow and outflow of gas. In addition, springs 55 and 56 are provided between the pistons 53 and 54 and the cylinders.

  Thus, two compressors are provided on both sides of the linear motor, and the function of the bearing of the moving part of the linear motor is shared by the pistons 53 and 54 moving in the cylinders 51 and 52. Thereby, it is not necessary to provide an independent bearing on the linear motor side, and the entire compressor including the motor can be configured compactly.

When an alternating current is passed through the annular coil 44, the cylindrical member 42 reciprocates between the position shown in FIG. 3 and the position shown in FIG. 4, and the pistons 53 and 54 are connected to the cylinder by the shaft 41 driven simultaneously. Reciprocate within.
That is, in the state of FIG. 3, the current flowing through the annular coil 44 forms a coil magnetic flux indicated by a dotted line in the direction shown in the figure, and the magnetic flux of the permanent magnet indicated by a solid line is strengthened. As a result, the annular magnetic teeth 42a and 42b of the cylindrical member 42 are attracted to the N pole of the permanent magnet 47a and the S pole of the permanent magnet 47b. Therefore, the gas in the first cylinder 51 is compressed and discharged from the exhaust port 51b, and conversely, the gas is sucked into the second cylinder 52 from the intake port 52a. In this case, the intake port 51a and the exhaust port 52b are closed.
Next, when the direction of the current changes, the state shifts to the state shown in FIG. At this time, gas is sucked into the first cylinder 51 from the intake port 51a, and the gas in the second cylinder 52 is compressed and discharged from the exhaust port 52b. In this case, the exhaust port 51b and the intake port 52a are closed. 3 and 4 show the case where the pistons 53 and 54 are arranged in the cylinders 51 and 52, the pistons are arranged on the inner periphery of the stator 46 of the motor 40 instead. It may be.

When an evaporator or the like is attached to the cylinder type compressor shown in FIGS. 3 and 4, an air conditioner can be configured. That is, the gas compressed by the compressor is rapidly expanded by the evaporator, so that the gas can be cooled and the surrounding heat can be absorbed to cool the surroundings.
In addition, if it replaces with gas and uses a liquid in the structure of FIG. 3, FIG. 4, the single phase linear motor of this invention can be used also as a motive power source of a pump.

  In addition, when alternating current is applied, the spring constant of the springs 55 and 56 and the inertia of the moving body are taken into account, and the input alternating current frequency is adjusted to the resonance frequency by an inverter or the like, thereby resonating the piston and Efficiency can be increased. In general, a single-phase motor has a single magnetomotive force vector due to a coil, and is therefore more efficient than a multi-phase motor. Further, since the structure is simple, the cost can be reduced.

FIG. 5 is a cross-sectional view of a cylinder type compressor showing a modification of the application example of the first embodiment shown in FIGS. The motor 40A used in this example is of the same type (2) as that of the first embodiment in terms of magnetic circuit, but is structurally in the form (d) described above.
That is, the armature 43A is fixed to the hollow shaft 41A, and the cylindrical member 42A is disposed on the outer periphery thereof. The shaft 41A is fixed to the cylinder case 51A at both ends, and the cylindrical member 42A is fixed to the inner peripheral wall of a piston case 53A serving as a housing slidably disposed in the cylinder case 51A in the axial direction. Each of the cylinder case 51A and the piston case 53A has a columnar shape in which disc-shaped bottom walls are formed at both ends of the cylinder. The bottom wall of the piston case 53A and the bottom wall of the cylinder case 51A located outside the cylinder case 51A Between them, coil springs 55A and 56A wound around the shaft 41A are arranged.

  The armature 43A has an annular coil 44A and a pair of armature yokes 45Aa and 45Ab surrounding the annular coil 44A, and the lead wire L that feeds power to the annular coil 44A is wired through the internal space of the shaft 41A. Each armature yoke 45Aa, 45Ab has a pair of cylindrical permanent magnets 47Aa, 47Ab fixed to the outer peripheral surface thereof. The cylindrical member 42A is formed with annular magnetic teeth 42Aa and 42Ab projecting inward at both ends in the axial direction. When one annular magnetic tooth faces the N pole of the permanent magnet, the other annular magnetic tooth Is configured to face the south pole of the permanent magnet.

  Also, the bottom wall on both sides of the cylinder case 51A is provided with an intake port and an exhaust port, similar to those shown in FIGS. Each intake port and exhaust port are provided with valves (not shown) to control the inflow and outflow of gas.

  According to said structure, two compressors can be provided in the both sides of a linear motor. Further, the function of the bearing of the moving part of the linear motor is shared by the piston case 53A that moves in the cylinder case 51A. Thereby, it is not necessary to provide an independent bearing on the linear motor side, and the entire compressor including the motor can be configured compactly.

When an alternating current is passed through the annular coil 44A, the cylindrical member 42A reciprocates, and the piston case 53A is reciprocated in the cylinder case 51A integrally therewith.
That is, in the state of FIG. 5, the coil magnetic flux generated by the current flowing through the annular coil 44A is fixed to the N pole magnetic flux of the permanent magnet 47Aa fixed to one armature yoke 45Aa and the other armature yoke 45Ab. The magnetic flux of the south pole of the permanent magnet 47Ab is strengthened. As a result, the annular magnetic teeth 42Aa and 42Ab of the cylindrical member 42 are attracted to the N pole of the permanent magnet 47Aa and the S pole of the permanent magnet 47Ab, and the piston case 53A moves to the left in the figure within the cylinder case 51A. Therefore, the gas in the left space in the figure of the cylinder case 51A is compressed and discharged from the exhaust port, and conversely, the gas is sucked into the right space in the figure from the intake port.

  When the direction of the current changes, the annular magnetic teeth 42Aa and 42Ab of the cylindrical member 42A are attracted to the S pole of the permanent magnet 47Aa and the N pole of the permanent magnet 47Ab, and the piston case 53A moves to the right in the figure in the cylinder case 51A. . Therefore, the gas in the space on the right side of the cylinder case 51A in the drawing is compressed and discharged from the exhaust port, and conversely, the gas is sucked into the space on the left side in the drawing from the intake port.

When an evaporator or the like is attached to the cylinder type compressor of FIG. 5, an air conditioner can be configured.
When flowing an alternating current, considering the spring constants of the coil springs 55A and 56A and the inertia of the moving body, the frequency of the input alternating current is matched with the resonance frequency, thereby resonating the piston and increasing the efficiency of the compressor. Can do. In the case of FIG. 5 as well, if a liquid is used instead of a gas, a cylinder pump can be obtained.

  6 is a cross-sectional view of an annular coil linear motor according to a second embodiment of the present invention, and FIG. 7 is a front view of the motor of FIG. The motor 60 according to the second embodiment includes a shaft 61 that is linearly reciprocable with respect to a housing (not shown), a cylindrical member 62 fixed to the shaft 61, and an outer peripheral surface of the cylindrical member 62. On the other hand, the armature 63 is fixed to a housing (not shown) so as to face the outside through an air gap.

The armature 63 is a single unit armature. The armature yoke 65a covers the outer periphery of the annular coil 64, a pair of cylindrical armature yokes 65a and 65b with a hook that sandwich the annular coil 64, and the annular coil 64. And a cylindrical yoke 66 connected to 65b.
In addition, the inner peripheral side of each armature yoke 65a, 65b is formed to wrap around the inside of the annular coil 64, and a pair of annular magnetic teeth 65c, 65d that are excited with different polarities when the annular coil 64 is energized. Is formed.

  The cylindrical member 62 is formed on a cylinder made of a magnetic material, and has a pair of N and S poles that can face one annular magnetic tooth 65c, and a pair of permanent magnets 62a and the N and S poles that can face the other annular magnetic tooth 65d. A pair of permanent magnets 62b is provided. The relationship between these magnetic teeth and the magnet is set so that when one annular magnetic tooth faces the N pole of the permanent magnet, the other annular magnetic tooth faces the S pole of the permanent magnet. That is, the motor of Example 4 is the above-mentioned type (1) in terms of magnetic circuit, and is structurally in the form (b) above.

  When a current flows through the annular coil 64 of the motor 60 of the second embodiment in a predetermined direction, the annular magnetic tooth 65c of one armature yoke 65a is excited to the N pole, and the annular magnetic tooth 65d of the other armature yoke 65b. Is excited by the S pole, the S pole of the permanent magnet 62a and the N pole of the permanent magnet 62b are attracted to face the magnetic teeth, and the cylindrical member 62 and the shaft 61 are on the left side with respect to the neutral state shown in FIG. Move to. When the current flows through the annular coil 64 in the opposite direction, the N pole of the permanent magnet 62a and the S pole of the permanent magnet 62b are attracted to face the magnetic teeth, and the cylindrical member 62 is opposed to the neutral state shown in FIG. And the shaft 61 moves to the right. Therefore, when an alternating current is passed through the annular coil 64, the cylindrical member 62 and the shaft 61 reciprocate (oscillate) left and right.

  FIG. 8 is a cross-sectional view of the annular coil linear motor according to the third embodiment of the present invention, and FIG. 9 is a front view of the motor of FIG. The motor 70 according to the third embodiment includes a shaft 71 supported so as to be linearly reciprocable in an axial direction with respect to a housing (not shown), a cylindrical member 72 fixed to the shaft 71, and an outer peripheral surface of the cylindrical member 72. On the other hand, an armature 73 fixed to a housing (not shown) is provided facing the outside through an air gap.

The armature 73 is a single unit armature. The armature yoke 75a covers the outer periphery of the annular coil 74, a pair of cylindrical armature yokes 75a and 75b with a hook that sandwich the annular coil 74, and the annular coil 74. And a cylindrical yoke 76 connected to 75b.
Further, the inner peripheral side of each armature yoke 75a, 75b is formed to wrap around the inside of the annular coil 74, and a pair of annular magnetic teeth 75c, 75d that are excited with different polarities when energized to the annular coil 74 are provided. Is formed.

The cylindrical member 72 is integrally formed from HB-shaped first and second unit movers 72a and 72b and a magnetic body 72c disposed therebetween, and is integrally formed with the shaft 71 against a housing (not shown). Are configured to be linearly movable.
The first unit mover 72a includes a permanent magnet 77 magnetized in the axial direction at the center and a pair of mover magnetic poles 78a and 78b covering both sides in the axial direction.
The other unit mover 72b is similarly configured. The relationship between these magnetic teeth and magnets is that when one annular magnetic tooth is opposed to the magnetic pole in contact with the N pole of the first unit mover 72a, the other annular magnetic tooth is in contact with the S pole of the permanent magnet. It is set to oppose.
That is, the motor of the third embodiment is the above-described type (3) in terms of magnetic circuit, and is structurally in the form (b) above.

When a current flows in the annular coil 74 of the motor 70 of the fifth embodiment in a predetermined direction, a coil magnetic flux is generated as shown by a broken line in FIG. 10, and the annular magnetic tooth 75c of one armature yoke 75a becomes the S pole. Since the annular magnetic teeth 75d of the other armature yoke 75b are excited to the N pole, the magnetic pole in contact with the N pole of the first unit mover 72a and the magnetic pole in contact with the S pole of the second unit mover 72b are excited. Is opposed to the magnetic teeth, and the cylindrical member 72 and the shaft 71 are moved to the right with respect to the neutral state of FIG.
The magnetic flux generated from the N pole of the permanent magnet 77 of the first unit mover 72a is changed from one armature yoke 75a through the cylindrical yoke 76 and the other armature yoke 75b as shown by the solid line in FIG. A closed magnetic path that returns to the S pole of the permanent magnet 77 through the second unit mover 72b and the magnetic body 72c is formed.

Further, when a current flows through the annular coil 74 in the reverse direction, a coil magnetic flux is generated as shown by a broken line in FIG. 11, the annular magnetic teeth 75c of one armature yoke 75a are excited to the N pole, and the other armature. Since the annular magnetic tooth 75d of the yoke 75b is excited to the S pole, the magnetic pole in contact with the S pole of the first unit mover 72a and the N pole of the second unit mover 72b are attracted to face the magnetic teeth. The cylindrical member 72 and the shaft 71 move to the left with respect to the neutral state in FIG.
The magnetic flux generated from the N pole of the permanent magnet 77 of the second unit mover 72b is changed from one armature yoke 75b through the cylindrical yoke 76 and the other armature yoke 75a as shown by the solid line in FIG. A closed magnetic path that returns to the S pole of the permanent magnet 77 through one unit mover 72a and the magnetic body 72c is formed.

  Therefore, when an alternating current is passed through the annular coil 74, the cylindrical member 72 and the shaft 71 reciprocate (vibrate). When the HB cylindrical member 72 is used as in the fifth embodiment, the magnetic flux of the permanent magnet is stronger than that of the PM type shown in the fourth embodiment, and the coil current is less likely to be affected by the armature reaction that is a magnet demagnetization. There are advantages.

The motor 60 of the second embodiment or the motor 70 of the third embodiment can be used as a power source for the cylinder compressor or pump shown in FIG.
In that case, by connecting pistons to both ends of the shaft 61 (71) fixed so as to move integrally with the cylindrical member 62 (72), the compressor or pump can be driven as in the case of FIG. it can.

1 is a cross-sectional view of an annular coil linear stepping motor according to Embodiment 1 of the present invention. It is a front view of the motor of FIG. It is sectional drawing which shows one operation state of the cylinder type compressor using the motor of FIG. It is sectional drawing which shows another operation state of the cylinder type compressor using the motor of FIG. FIG. 6 is a cross-sectional view of a cylinder compressor showing a modification of the application example of the first embodiment. It is sectional drawing of the annular coil type | mold linear stepping motor concerning Example 2 of this invention. It is a front view of the motor of FIG. It is sectional drawing of the annular coil type | mold linear stepping motor concerning Example 3 of this invention. It is a front view of the motor of FIG. It is explanatory drawing which shows operation | movement of the motor of FIG. It is explanatory drawing which shows operation | movement of the motor of FIG. It is sectional drawing of the conventional annular coil type linear stepping motor. It is explanatory drawing which shows schematic structure of the compressor for the conventional air conditioners of a motor vehicle.

Explanation of symbols

40, 60, 70: annular coil linear motor 41: shaft 42: cylindrical members 42a, 42b: magnetic teeth 43: armature 44: annular coils 45a, 45b: armature yoke 46: cylindrical yokes 47a, 47b: permanent magnets

Claims (11)

An armature configured to hold an annular coil with a pair of armature yokes made of a magnetic material;
A cylindrical member having a magnetic structure opposed to the armature through a radial air gap, and relatively movable linearly along the axial direction with respect to the armature;
A shaft that supports one of the armature and the cylindrical member;
A cylindrical housing that supports the shaft and has the other of the armature and the cylindrical member fixed concentrically;
Each of the pair of armature yokes has a pair of annular magnetic teeth formed in a convex shape on the surface facing the magnetic body structure of the cylindrical member or a pair of magnets alternately magnetized in the N and S poles in the axial direction. An annular magnet is provided,
One of the armature and the cylindrical member is moved along the axis with respect to the housing by a magnetic force acting between the armature and a magnetic structure formed on the cylindrical member by energizing the annular coil. An annular coil type single-phase linear motor that is relatively linearly moved, or one of the armature and the cylindrical member and the shaft are integrally moved relatively to the housing.   Each of the armature yokes has a single annular magnetic tooth, and the magnetic body structure of the cylindrical member has a pair of N and S pole permanent magnets that can face one of the annular magnetic teeth, and the other of the other A pair of N and S pole permanent magnets that can be opposed to the annular magnetic teeth, and these permanent magnets are arranged so that when one of the annular magnet teeth faces the N pole of the permanent magnet, the other annular magnet The annular coil type single-phase linear motor according to claim 1, wherein teeth are configured to face the south pole of the permanent magnet.   The magnetic structure of the cylindrical member includes a pair of annular magnetic teeth, and one armature yoke includes a pair of N and S pole permanent magnets that can face the one annular magnetic tooth, The other armature yoke is provided with a pair of N and S-pole permanent magnets that can face the other annular magnetic teeth, and one of the permanent magnets has one of the annular magnetic teeth of the permanent magnet. 2. The annular coil single-phase linear motor according to claim 1, wherein when facing the N pole, the other annular magnetic tooth is opposed to the S pole of the permanent magnet.   Each of the armature yokes has a single annular magnetic tooth, and the magnetic structure of the cylindrical member includes a permanent magnet magnetized in N and S poles along the axial direction, and the permanent magnet on both sides in the axial direction. A pair of unit movers comprising a pair of magnetic poles sandwiched from each other is provided. These permanent magnets are arranged so that the directions of the magnetic poles are opposite to each other, and one of the annular magnetic teeth is in contact with the N pole of the permanent magnet. 2. The annular coil single-phase linear motor according to claim 1, wherein when facing the magnetic pole, the other annular magnetic tooth is opposed to the magnetic pole in contact with the S pole of the permanent magnet.   The cylindrical member is supported by the shaft, the armature is fixed to the outer periphery of the cylindrical member, the shaft is fixed to the housing, and the cylindrical member uses the shaft as a guide. The annular coil type single-phase linear motor according to any one of claims 1 to 4, wherein the ring-shaped single-phase linear motor is linearly moved relative to the housing.   The cylindrical member is supported by the shaft, and the armature is fixed to the housing on the outer periphery of the cylindrical member, and the shaft is supported so as to be linearly movable in the axial direction with respect to the housing. 5. The annular coil single-phase linear motor according to claim 1, wherein the cylindrical member linearly moves relative to the housing integrally with the shaft.   The armature is supported by the shaft, the cylindrical member is fixed to the housing on the outer periphery of the armature, the shaft is fixed to the housing, and the armature uses the shaft as a guide. The annular coil type single-phase linear motor according to claim 1, wherein the annular coil type single-phase linear motor moves linearly relative to the housing.   The armature is supported by the shaft, and the cylindrical member is fixed to the housing on an outer periphery of the armature, and the shaft is supported so as to be linearly movable in the axial direction with respect to the housing. 5. The annular coil single-phase linear motor according to claim 1, wherein the child linearly moves relative to the housing integrally with the shaft.   The annular coil single-phase linear motor according to claim 1, wherein the shaft and the cylindrical member are fixed so as to move linearly integrally, and pistons that move in the cylinder along the axial direction are provided at both ends of the shaft. A cylinder-type compressor or pump characterized in that the piston is reciprocated by attaching current to the annular coil.   A spring is disposed on the inner periphery of the piston and the cylinder or motor stator, and considering the spring constant of the spring and the inertia of the moving body, the frequency of the alternating current input is adjusted to the resonance frequency, whereby the piston The cylinder type compressor or pump according to claim 9, wherein   3. The annular coil linear motor according to claim 2, wherein the cylindrical member includes a back yoke made of a magnetic material fixed to a side of the permanent magnet provided on the cylindrical member that does not face the armature. .

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