JP6520047B2 - Motor and compressor using the same - Google Patents

Description

  The present invention relates to a motor and a compressor using the same.

  BACKGROUND Conventionally, a compressor that compresses fluid is known and mounted in many products such as an air conditioner.

  The compressor has a closed vessel, a motor and a fluid compression mechanism installed therein. The electric motor has a stator fixed to the closed vessel and a rotor rotatably provided inside the stator. The rotation of the rotor is transmitted to the fluid compression mechanism via the drive shaft.

  In the fluid compression mechanism, the drive shaft is often provided with an eccentric part, and the movable part is often attached to the eccentric part. For this reason, the center of gravity of the eccentric part and the movable part is offset from the rotation axis, and the weight distribution thereof is unbalanced, so that vibration may occur during operation of the compressor. In order to correct this imbalance and stabilize the rotation of the rotor, balance weights are usually attached to the rotor.

  It is necessary to adjust the weight of the balance weight in order to properly correct the imbalance in the weight distribution of the eccentric part and the movable part. Patent Document 1 (Japanese Patent No. 3789825) firstly forms a punching hole in the balance weight as a method of adjusting the weight of the balance weight, and secondly forms a notch on the side surface of the balance weight Disclose how to

  However, these methods complicate the shape of the outer surface of the balance weight with an increase in the unevenness of the balance weight and the like. The complexity of this shape can agitate the fluid and lubricating oil in the compressor's closed container and cause an increase in oil spillage.

  In order to prevent the adverse effect of complicating the outer surface shape of the balance weight, in the compressor disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 2014-70586), a cover that covers the balance weight is installed on the rotor. However, this configuration increases the cost due to the addition of the cover and requires an extra assembly step of attaching the cover.

  An object of the present invention is to control the weight adjustment of the balance weight from inducing an undesirable phenomenon such as an increase in oil spillage.

  A motor according to a first aspect of the present invention includes a rotor, a stator, and a balance weight. The rotor rotates about the rotation axis. The stator interacts magnetically with the rotor. The balance weight is attached to the rotor. The balance weight has a rotor contact surface that contacts the rotor. In the vicinity of the rotor contact surface of the balance weight, a recessed portion recessed in the extending direction of the rotation axis is provided. The recess is surrounded by the rotor contact surface.

  According to this configuration, the recess of the balance weight is surrounded by the rotor contact surface. Therefore, the recess is not exposed when the balance weight is attached to the rotor. As a result, the influence of the recess on the external environment of the motor is suppressed.

  An electric motor according to a second aspect of the present invention is the electric motor according to the first aspect, wherein the balance weight further has at least two through holes. The at least two through holes are for receiving fasteners. The fastener secures the balance weight to the rotor. The recess is located between the two through holes.

  According to this configuration, the fastener fixes the balance weight to the rotor on both sides of the recess respectively. As a result, since the sealing performance of the recess is enhanced, the influence of the recess on the external environment of the motor can be further reduced.

  The motor according to a third aspect of the present invention is the motor according to the second aspect, wherein the distance from the rotation axis to the center of the recess is larger than the distance from the rotation axis to the centers of the respective through holes.

  According to this configuration, the recess is provided on the outer peripheral side of the rotor. As a result, since it is possible to greatly change the mr amount which is the product of the mass of the balance weight and the radial distance from the rotation axis to the center of gravity of the balance weight, weight balance adjustment can be effectively performed. it can.

  The electric motor according to a fourth aspect of the present invention is the electric motor according to any one of the first to third aspects, wherein the depth in the direction of the rotation axis of the recess is the dimension in the direction of the rotation axis of the balance weight 5% or more and 90% or less of

  According to this configuration, a large fluctuation range of the weight of the balance weight can be secured.

  A compressor according to a fifth aspect of the present invention includes the motor according to any one of the first to fourth aspects, a drive shaft, and a fluid compression mechanism. The drive shaft is fixed to the rotor. The fluid compression mechanism is coupled to the drive shaft. The fluid compression mechanism compresses the fluid by the power transmitted from the motor via the drive shaft.

  According to this configuration, the recess of the balance weight is surrounded by the rotor contact surface. Therefore, the recess is isolated from the fluid in the compressor, the lubricating oil, and the like, and the fluid, the lubricating oil, and the like are not easily affected by the recess. As a result, undesirable phenomena such as agitation of the fluid and the lubricating oil or an increase in oil leakage hardly occur.

  A compressor according to a sixth aspect of the present invention is the compressor according to the fifth aspect, which is a rotary type or a scroll type.

  According to this configuration, it is possible to provide a rotary compressor or a scroll compressor which is less likely to induce an increase in oil leakage.

  According to the motor according to the first aspect and the second aspect of the present invention, it is possible to suppress the influence of the recess of the balance weight on the external environment of the motor.

  According to the motor of the third aspect of the present invention, adjustment of the weight balance of the rotor can be effectively performed.

  According to the motor of the fourth aspect of the present invention, it is possible to secure a large fluctuation range of the weight of the balance weight.

  According to the compressor according to the fifth aspect or the sixth aspect of the present invention, undesirable phenomena such as stirring of the fluid and the lubricating oil or an increase in oil outflow hardly occur.

FIG. 1 is a schematic view of a motor according to a first embodiment of the present invention. FIG. 1 is a bottom view of a rotor of a motor according to a first embodiment of the present invention. Sectional drawing along the III-III line of FIG. FIG. 1 is a perspective view of a balance weight of a motor according to a first embodiment of the present invention. FIG. 1 is a plan view of a balance weight of a motor according to a first embodiment of the present invention. FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 5; The schematic diagram of the compressor concerning 2nd Embodiment and 3rd Embodiment of this invention. Sectional drawing of the compressor based on 2nd Embodiment of this invention. Sectional drawing of the compressor based on 3rd Embodiment of this invention.

  Hereinafter, an embodiment of an air conditioner according to the present invention will be described using the drawings. The specific configurations of the motor and the compressor according to the present invention are not limited to the following embodiments, and can be appropriately modified without departing from the scope of the invention.

First Embodiment
(1) Overall Configuration FIG. 1 is a schematic view of a motor according to a first embodiment of the present invention. The motor 100 includes a casing 110, a stator 120, a rotor 10, a balance weight 80, and a balance weight 90 (see FIG. 3).

(2) Detailed configuration (2-1) Casing 110
As shown in FIG. 1, the casing 110 accommodates various parts of the motor 100. The casing 110 is only shown conceptually in FIG. 1, and the casing 110 can have any shape as required.

(2-2) Stator 120
The stator 120 is fixed to the casing 110. The stator 120 has a plurality of coils 121 constituting a plurality of magnetic poles.

(2-3) Rotor 10
The rotor 10 is rotatably installed around the rotation axis RA. A gap G is generated between the rotor 10 and the stator 120.

  FIG. 2 is a bottom view of the rotor 10. A drive shaft installation hole 11 is provided in a region including the rotation axis RA of the rotor 10, and a drive shaft (not shown) is inserted and fixed here. In the rotor 10, a plurality of permanent magnets 40 constituting a plurality of magnetic poles are embedded.

  FIG. 3 is a cross-sectional view taken along the line III-III of FIG. The rotor 10 has a rotor core 20 made of laminated steel plates and the like, and upper and lower two end plates 30 for preventing the permanent magnet 40 from jumping out of the rotor core 20. The rotor 10 is provided with fastener insertion holes 12 into which fasteners 50 are inserted. The fastener 50 is for fastening and fixing the rotor core 20, the end plate 30, and balance weights 80 and 90 described later, and is, for example, a rivet. Alternatively, the fasteners 50 may be bolts and nuts, screws, and the like.

(2-4) Balance weights 80 and 90
A balance weight 90 is installed on the upper end plate 30 of the rotor 10. A balance weight 80 is installed on the lower end plate 30.

  Depending on the degree of weight distribution imbalance to be corrected, the balance weight 90 may not necessarily be installed.

(3) Details of Configuration of Balance Weight 80 FIG. 4 is a perspective view of the balance weight 80. As shown in FIG. Two through holes 83 are formed in the balance weight 80. The through hole 83 is used for inserting the fastener 50 or the like. The number of through holes 83 is not limited to two, and may be other than that.

  On the upper side of the balance weight 80 in the drawing, a recess 82 and a rotor contact surface 81 surrounding the entire circumference thereof are provided. On the other hand, a lower surface 85 is provided below the balance weight 80 in the drawing.

  The recess 82 is provided between the two through holes 83. The recess 82 has a bottom surface 82a extending in the circumferential direction of the rotor 10 and four side surfaces surrounding it, that is, a first long side surface 82b, a second long side surface 82c, a first short side surface 82d, and a first 2 has a short side surface 82e. The bottom surface 82 a is parallel or substantially parallel to the rotor contact surface 81.

  As shown in FIG. 3, the balance weights 80 are attached to the rotor 10 such that the rotor contact surface 81 contacts the end plate 30 of the rotor 10. At this time, the bottom surface 82 a of the recess 82 is closer to the lower surface 85 than the rotor contact surface 81. That is, the position of the projection point of the bottom surface 82a to the rotation axis RA is different from the position of the projection point of the rotor contact surface 81 to the rotation axis RA, and the projection point of the lower surface 85 to the rotation axis RA Closer to the location of. Hereinafter, this structure will be expressed as "the recess 82 is recessed in the extending direction of the rotation axis RA."

  The recess 82 is recessed in the extending direction of the rotation axis RA, and the entire periphery is surrounded by the rotor contact surface 81, so the recess 82 is not exposed to the outside. Thus, the recess 82 is a closed space sealed.

  FIG. 5 is a plan view of the balance weight 80. As shown in FIG. The balance weight 80 has an arc shape extending in the circumferential direction. The recess 82 also has a circular arc shape extending in the circumferential direction. The width of the recess 82 corresponds to the distance between the first long side surface 82 b and the second long side surface 82 c in the radial direction of the rotor 10. Plotting the center of the width of the recess 82 produces an arc-shaped curve. This curve is the center RC of the recess 82. The through hole 83 has a circular cross section having a center HC. The distance A from the rotation axis RA to the center RC of the recess 82 is larger than the distance B from the rotation axis RA to the center HC of the through hole 83.

  6 is a cross-sectional view taken along the line VI-VI of FIG. The depth D, which is the dimension in the extension direction of the rotational axis RA of the recess 82, is the height difference between the rotor contact surface 81 and the bottom surface 82a. The height H, which is the dimension in the extension direction of the rotation axis RA of the balance weight 80, is the height difference between the rotor contact surface 81 and the lower surface 85. When the depth D of the recess 82 is varied in the range of 5% to 90% of the height H of the balance weight 80, a large weight adjustment range can be realized. If the balance weight 80 is made of, for example, brass, the balance weight 80 can have sufficient strength even if the depth D is varied within this range.

  In the present embodiment, the concave portion 82 has a circular arc shape extending in the circumferential direction, but the shape of the concave portion 82 is not limited to this, and may extend linearly, for example.

(4) Characteristics (4-1)
In the vicinity of the rotor contact surface 81 of the balance weight 80, a recessed portion 82 recessed in the extension direction of the rotation axis RA is provided. The recess 82 is surrounded by the rotor contact surface 81.

  According to this configuration, when the balance weight 80 is attached to the rotor 10, the recess 82 is not exposed. As a result, the influence of the recess 82 on the external environment of the motor 100 is suppressed.

(4-2)
In the balance weight 80, the recess 82 is located between the two through holes 83.

  According to this configuration, the fastener 50 fixes the balance weight 80 to the rotor 10 on both sides of the recess 82 respectively. As a result, since the sealing property of the recess 82 is enhanced, the influence of the recess 82 on the external environment of the motor 100 can be further reduced.

(4-3)
The distance A from the rotation axis RA to the center RC of the recess 82 is larger than the distance B from the rotation axis RA to the centers HC of the respective through holes 83.

  According to this configuration, the recess 82 is provided on the outer peripheral side. As a result, the mr amount, which is the product of the mass of the balance weight 80 and the distance in the radial direction from the rotation axis RA to the center of gravity of the balance weight, can be greatly varied, so weight balance adjustment is performed effectively. be able to.

(4-4)
The depth D of the recess 82 is not less than 5% and not more than 90% of the height H of the balance weight 80.

  According to this configuration, a large fluctuation range of the weight of the balance weight 80 can be secured.

Second and Third Embodiments
(1) Common Overall Configuration FIG. 7 is a schematic view of a compressor according to the second and third embodiments of the present invention. The compressor 200 includes a sealed container 210, an electric motor 100, a fluid compression mechanism 220, and a drive shaft 260.

  The closed container 210 accommodates various components of the compressor 200. The closed container 210 is only shown conceptually in FIG. 7, and the shape of the closed container 210 can be changed as needed.

  The motor 100 is according to the first embodiment described above. A drive shaft 260 is fixed to the drive shaft installation hole 11 (FIG. 3) of the rotor 10 (FIG. 3) of the motor 100.

  The fluid compression mechanism 220 compresses a fluid such as a refrigerant. The power necessary for compression is supplied from the motor 100 to the fluid compression mechanism 220 via the drive shaft 260.

(2) Second Embodiment FIG. 8 is a cross-sectional view showing a detailed configuration of a compressor 200A according to a second embodiment. The compressor 200A is a rotary compressor. Arrows indicate the flow of fluid to be compressed. This fluid is, for example, a refrigerant used in an air conditioner.

  In the sealed container 210, the motor 100, the fluid compression mechanism 220A, the first bearing member 231, the second bearing member 232, and the drive shaft 260 are accommodated. The first bearing member 231 and the second bearing member 232 rotatably support a drive shaft 260 connecting the motor 100 and the fluid compression mechanism 220A. Furthermore, a lubricating oil reservoir 250 is provided below the inside of the sealed container 210.

  The fluid is taken in from the suction pipe 241, compressed by the fluid compression mechanism 220A, and discharged from the discharge pipe 242.

  The motor 100 is according to the first embodiment described above. The role of the casing 110 of the motor 100 is played by the closed container 210. A balance weight 80 is attached to the rotor 10. The balance weight 80 is provided with a recess 82 which is not exposed to the outside of the rotor 10.

  The fluid compression mechanism 220A includes a cylinder 221A fixed to the closed container 210, and a piston 222A installed on the eccentric portion 261 of the drive shaft 260. When the motor 100 revolves the piston 222A in the cylinder 221A, the volume of the compression chamber 223A defined by the cylinder 221A and the piston 222A is reduced, whereby the fluid is compressed.

(3) Third Embodiment FIG. 9 is a cross-sectional view showing a detailed configuration of a compressor 200B according to a third embodiment. The compressor 200B is a scroll compressor. Arrows indicate the flow of fluid to be compressed. This fluid is, for example, a refrigerant used in an air conditioner.

  In the sealed container 210, the motor 100, the fluid compression mechanism 220B, the first bearing member 231, the second bearing member 232, and the drive shaft 260 are accommodated. The first bearing member 231 and the second bearing member 232 rotatably support a drive shaft 260 connecting the motor 100 and the fluid compression mechanism 220B. Furthermore, a lubricating oil reservoir 250 is provided below the inside of the sealed container 210.

  The fluid is taken in from the suction pipe 241, compressed by the fluid compression mechanism 220B, and discharged from the discharge pipe 242.

  The motor 100 is according to the first embodiment described above. The role of the casing 110 of the motor 100 is played by the closed container 210. A balance weight 80 is attached to the rotor 10. The balance weight 80 is provided with a recess 82 which is not exposed to the outside of the rotor 10.

  The fluid compression mechanism 220B has a fixed scroll 221B fixed to the closed container 210 and a movable scroll 222B installed on the eccentric part 261 of the drive shaft 260. When the motor 100 revolves the movable scroll 222B, the volume of the compression chamber 223B defined by the fixed scroll 221B and the movable scroll 222B is reduced, whereby the fluid is compressed.

(4) Features In this section, the features common to the compressor according to the second embodiment (FIG. 8) and the third embodiment (FIG. 9) will be described.

  The lubricating oil stored in the lubricating oil reservoir 250 is pumped up to lubricate the friction points of the motor 100 and the fluid compression mechanisms 220A and 220B, and then travels down the inner surface of the sealed container 210 and the surface of the other components. And return to the lubricating oil reservoir 250 again.

  However, when the rotor 10 rotates during operation of the compressors 200A and 200B, the fluid to be compressed, which is filled in the closed vessel 210, is agitated. As a result, mist formation of circulating liquid lubricating oil may occur, and further mixing of the fluid and the lubricating oil may occur. At this time, the lubricating oil may flow along the fluid path together with the fluid and may be discharged from the discharge pipe 242, so-called "out of oil" may occur.

  In general, by optimizing the distance between the motor 100 and the lubricating oil reservoir 250, the shape of the sealed container 210, and the design of other parts, it is possible to prevent oil spill from occurring. However, even in such a case, if the shape of the balance weight 80 is changed to adjust the weight balance, the shape change may affect the movement of the fluid, which may cause an increase in the oil rise. is there.

  On the other hand, according to the present invention, since the balance weight 80 is adjusted in weight by the recess 82 not exposed to the outside of the rotor 10, the movement of the fluid is not affected, and the induction of the undesirable phenomenon is suppressed. Ru.

  The present invention is widely applicable to a motor used for various applications, a compressor using the motor, an air conditioner using the compressor, and the like.

DESCRIPTION OF SYMBOLS 10 Rotor 11 Drive shaft installation hole 12 Fastener insertion hole 20 Rotor core 30 End plate 40 Permanent magnet 50 Fastener 80 Balance weight 81 Rotor contact surface 82 Recess 82a Bottom surface 82b 1st long side 82c 2nd long side 82d 1st short side 82e 2nd short side 83 through hole 85 bottom 90 balance weight 100 motor 110 casing 120 stator 121 coil 200 200A, 200B compressor 210 closed vessel 220, 220A, 220B fluid compression mechanism 221A cylinder 221B Fixed scroll 222A Piston 222B Movable scroll 223A, 223B Compression chamber 231 First bearing member 232 Second bearing member 241 Suction pipe 242 Discharge pipe 250 Lubricant storage portion 260 Drive shaft 261 Eccentric portion A From the center of rotation axis to the center of the recess Center of RA rotation axis RC recess distance B rotation axis from the distance D the recess to the center of the through hole of the depth G gap H counterweight height HC through hole

Patent No. 3789825 gazette JP, 2014-70586, A

Claims (5)

A rotor (10) that rotates about a rotational axis (RA);
A stator (120) magnetically interacting with the rotor;
A balance weight (80) attached to the rotor;
Equipped with
The balance weight is
A rotor contact surface (81) which is arc-shaped and contacts the rotor ;
A rotor non-contact surface (85) which is arc-shaped and faces the rotor contact surface;
Have
In the vicinity of the rotor contact surface of the balance weight, a recessed portion (82) recessed in the extending direction of the rotation axis is provided.
The recess is surrounded by the rotor contact surface ,
The rotor non-contact surface is a plane,
The rotor non-contact surface has a region overlapping with the recess in a plan view,
The balance weight comprises at least two through holes (83) extending from the rotor contact surface to the rotor non-contact surface for receiving fasteners (50) for securing the balance weight to the rotor. In addition,
Motor (100). The distance (A) from the rotation axis to the center (RC) of the recess is greater than the distance (B) from the rotation axis to the centers (HC) of the respective through holes.
The motor according to claim 1 . The depth (D) in the direction of the rotation axis of the recess is 5% or more and 90% or less of the dimension (H) in the direction of the rotation axis of the balance weight.
The electric motor according to claim 1 or 2 . The motor according to any one of claims 1 to 3 ;
A drive shaft (260) fixed to the rotor;
A fluid compression mechanism (220) coupled to the drive shaft and compressing a fluid by the power transmitted from the motor via the drive shaft;
A compressor (200) comprising: Rotary type or scroll type
The compressor according to claim 4 .

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