JP5733336B2 - Stator, motor and compressor - Google Patents

Description

  The present invention relates to a stator including an insulator that insulates a core and a coil, a motor including the stator, and a compressor including the motor.

  A conventional stator includes an annular core and insulators arranged on both end faces of the core. The insulator has a protrusion that protrudes from the outer end toward the core. And this insulator is fixed to a core by engaging this protrusion part with the groove part formed in the outer peripheral surface of a core.

  By the way, the core is formed by laminating a plurality of thin plates made of a metal material in the vertical direction. It is preferable that the plurality of thin plates used for the core have the same shape from the viewpoints of simplifying the manufacturing process and reducing the mold cost. That is, it is preferable that the core is formed of one type of thin plate. Therefore, the groove part formed in the outer peripheral surface of the core is a through groove penetrating in the vertical direction so that it can be formed of one kind of thin plate.

Special table 2007-531485 gazette

  In the conventional stator, since the core is relatively large, the influence of the groove on the flow of magnetic flux is small. Therefore, there is no significant problem even if the groove formed on the outer peripheral surface of the core is a through groove. However, in recent years, with the downsizing of compressors, downsizing of cores has been promoted. In that case, there is a problem that the through groove formed in the outer peripheral surface of the core obstructs the flow of magnetic flux and the motor efficiency is lowered.

  Therefore, an object of the present invention is to provide a stator, a motor, and a compressor that can prevent a groove formed on an outer peripheral surface of a core from obstructing a flow of magnetic flux and reducing motor efficiency.

A stator according to a first aspect of the present invention includes an annular core having a plurality of teeth projecting radially inward, and an insulator disposed at an axial end of the core. A projecting portion projecting from the end portion toward the core, the core being disposed on an outer peripheral surface of the axial end portion, and having a groove portion engaged with the projecting portion, wherein the groove portion projects from the projecting portion; It is characterized by having substantially the same shape as the portion and not in the entire region in the axial direction.

In this stator, since there are no groove portions in the entire area in the axial direction, the core portion can be increased as compared with the conventional stator in which the groove portion is a through groove. Therefore, it can prevent that the groove part formed in the outer peripheral surface of a core obstructs the flow of magnetic flux, and reduces motor efficiency.
Further, since the core portion can be increased as compared with the conventional stator, the rigidity of the core can be improved.
Further, in the conventional stator in which the groove portion is a through groove, oil stays in a portion of the groove portion that does not engage with the protruding portion of the insulator. However, in this stator, since there is no groove portion in the entire area in the axial direction, the amount of oil remaining in the groove portion can be reduced.

  In the stator according to the second invention, in the stator according to the first invention, the insulator is arranged at the first insulator disposed at one axial end portion of the core and the other axial end portion of the core. A first groove portion of the core that engages with a first protrusion of the first insulator, and a second groove portion of the core that engages with a second protrusion of the second insulator. Are in the same position in plan view.

  In this stator, since the first groove portion and the second groove portion are at the same position in plan view, the types of thin plates for forming the core can be reduced.

  In the stator according to the third invention, in the stator according to the second invention, the first groove portion and the second groove portion are arranged at positions corresponding to the tooth portions on the outer peripheral surface of the core. Features.

  In this stator, since the groove portion is arranged at a position where the influence on the magnetic flux flow is small, it is possible to prevent the groove portion formed on the outer peripheral surface of the core from obstructing the magnetic flux flow.

  A motor according to a fourth aspect of the invention includes the stator according to any one of the first to third aspects of the invention, and a rotor arranged inside the stator.

  In this motor, by using the above stator, the groove formed on the outer peripheral surface of the core can be prevented from obstructing the flow of magnetic flux, the rigidity of the core can be improved, and the amount of oil retained in the groove can be reduced. Can be reduced.

  In the compressor concerning 5th invention, the motor concerning 4th invention is provided, It is characterized by the above-mentioned.

  In this compressor, by using the motor described above, it is possible to prevent the grooves formed on the outer peripheral surface of the core from obstructing the flow of magnetic flux, improve the rigidity of the core, and reduce the amount of oil retained in the grooves. Can be reduced.

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

In the first invention, since there are no groove portions in the entire area in the axial direction, the core portion can be increased as compared with the conventional stator in which the groove portion is a through groove. Therefore, it can prevent that the groove part formed in the outer peripheral surface of a core obstructs the flow of magnetic flux, and reduces motor efficiency.
Further, since the core portion can be increased as compared with the conventional stator, the rigidity of the core can be improved.
Further, in the conventional stator in which the groove portion is a through groove, oil stays in a portion of the groove portion that does not engage with the protruding portion of the insulator. However, in this stator, since there is no groove portion in the entire area in the axial direction, the amount of oil remaining in the groove portion can be reduced.

  In the second invention, since the first groove portion and the second groove portion are at the same position in plan view, the types of thin plates for forming the core can be reduced.

  In the third aspect of the invention, since the groove portion is disposed at a position where the influence on the magnetic flux flow is small, it is possible to prevent the groove portion formed on the outer peripheral surface of the core from obstructing the magnetic flux flow.

  In 4th invention, by using said stator, it can prevent that the groove part formed in the outer peripheral surface of a core inhibits the flow of magnetic flux, can improve the rigidity of a core, and the residence of the oil which retains in a groove part The amount can be reduced.

  In the fifth invention, by using the motor described above, the groove formed on the outer peripheral surface of the core can be prevented from obstructing the flow of magnetic flux, the rigidity of the core can be improved, and the amount of oil retained in the groove Can be reduced.

It is sectional drawing which shows the compressor which concerns on embodiment of this invention. It is the perspective view which looked at the stator shown in FIG. 1 from upper direction. (A) is a plan view of the core shown in FIG. 1, (b) is a sectional view taken along line III (b) -III (b) of (a), and (c) is a diagram of magnetic flux in the core. It is a figure for demonstrating a flow. It is a perspective view of the insulator shown in FIG. FIG. 5 is a partially enlarged cross-sectional view of the compressor corresponding to a cross section taken along line VV shown in FIG. 3. It is a top view of the thin plate which comprises the core shown in FIG.

  Hereinafter, an embodiment of a compressor 1 according to the present invention will be described with reference to the drawings.

[Compressor 1]
As shown in FIG. 1, the compressor 1 is a one-cylinder rotary compressor, and includes an accumulator 2, a sealed casing 3, a drive mechanism 4 and a compression mechanism 5 disposed in the sealed casing 3. ing. The drive mechanism 4 is disposed above the compression mechanism 5. The compression mechanism 5 includes a cylinder 51, a front head 52, and a rear head 53. In addition, lubricating oil L for smoothing the operation of the sliding portion of the compression mechanism 5 is stored at the bottom of the sealed casing 3. In FIG. 1, hatching indicating a cross section of the drive mechanism 4 is omitted.

  In the compressor 1, the refrigerant (in this embodiment, CO 2) introduced from the inlet pipe 2 a of the accumulator 2 is introduced into the sealed casing 3 from the suction pipe 6, compressed by the compression mechanism 5, and then discharged from the discharge pipe 7. Discharged from. The compressor 1 is used by being incorporated in a refrigeration cycle such as an air conditioner, for example, and is installed in the direction shown in FIG. 1, that is, the direction in which the direction of the shaft 9 is the vertical direction.

[Drive mechanism 4]
The drive mechanism 4 drives the compression mechanism 5 and includes a motor 8 serving as a drive source and a shaft 9 driven by the motor 8. This motor 8 is a concentrated winding motor in which a coil 90 (see FIG. 2) of each phase (U phase, V phase, W phase) is wound around a tooth portion 62 of a core 60 described later. The motor 8 includes a stator 10 including a core 60 and a rotor 11 disposed on the radially inner side. The shaft 9 is inserted into a through hole 11 a formed at a substantially central portion of the rotor 11.

<Stator 10>
The stator 10 includes an annular core 60 fixed to the inner peripheral surface of the hermetic casing 3, an upper insulator 70 (first insulator) disposed at an upper end portion 60 a (one axial end portion) of the core 60, and a core 60. A lower insulator 80 (second insulator) disposed at the lower end 60b (the other end in the axial direction), and a core 60 and a coil 90 (see FIG. 2) wound around the upper and lower insulators 70 and 80. .

<Core 60>
The core 60 is formed by laminating a plurality of thin plates made of metal materials and joining them together by welding or the like. As shown in FIG. 3, the core 60 includes an annular back yoke portion 61, nine tooth portions 62 projecting radially inward from the back yoke portion 61, and adjacent tooth portions 62. It has nine slots 63 formed. Nine slots 63 are formed through the core 60 in the vertical direction. The rotor 11 is disposed in the through hole H formed in the substantially central portion of the core 60.

  In addition, nine core cut portions 64 that are straight portions in plan view are formed on the outer peripheral surface of the core 60. Each core cut portion 64 is provided at a position corresponding to the tooth portion 62 on the outer peripheral surface of the core 60. The core cut portion 64 is not in contact with the inner peripheral surface of the sealed casing 3. Therefore, the lubricating oil L that has passed through the sliding portion of the compression mechanism 5 and the rotor 11 passes through the gap between the inner peripheral surface of the sealed casing 3 and the core cut portion 64. The lubricating oil L is then stored at the bottom of the sealed casing 3.

  As shown in FIG. 3, groove portions 65 are formed on the outer peripheral surfaces of both end portions 60 a and 60 b of the core 60. As shown in FIG. 3B, the groove 65 is divided into a first groove 66 and a second groove 67. In the following description of the groove portion, the groove portion 65 is used when the first groove portion 66 and the second groove portion 67 do not need to be distinguished, and the first groove portion 66 or the second groove portion 67 is usually used.

  The first groove 66 is disposed on the outer peripheral surface of the upper end 60 a of the core 60. A protrusion 74 (first protrusion) protruding from the outer end of the upper insulator 70 toward the core 60 is engaged with the first groove 66. Three first groove portions 66 are formed at predetermined intervals (120 °) in the circumferential direction. Each first groove portion 66 is disposed in the core cut portion 64. That is, each first groove portion 66 is disposed at a position corresponding to the tooth portion 62 on the outer peripheral surface of the core 60 (outside in the radial direction of the tooth portion 62).

  The second groove portion 67 is disposed on the outer peripheral surface of the lower end portion 60 b of the core 60. The second groove 67 engages with a protruding portion 84 (second protruding portion) that protrudes from the outer end portion of the lower insulator 80 toward the core 60 side. Three second groove portions 67 are formed at predetermined intervals (120 °) in the circumferential direction. Each second groove portion 67 is disposed in the core cut portion 64. That is, each second groove portion 67 is disposed at a position corresponding to the tooth portion 62 on the outer peripheral surface of the core 60. The first groove portions 66 and the second groove portions 67 are arranged at the same position in plan view.

  As shown in FIG. 3B, the groove portion 65 does not exist in the entire region in the axial direction of the core 60. Therefore, a part of the region in the axial direction of the core 60 has no groove 65 and is a core portion. For example, in the present embodiment, as shown in FIG. 3B, the portion between the first groove portion 66 and the second groove portion 67 is the core 60 portion. Further, as shown in FIG. 3C, the flow of magnetic flux in the core 60 is directed from the radially inner end of the tooth portion 62 toward the radially outer portion of the back yoke portion 61 rather than the slot 63. . Therefore, the position corresponding to the tooth portion 62 on the outer peripheral surface of the core 60 is less affected by the magnetic flux.

  As shown in FIG. 5, the axial lengths of the first groove portion 66 and the second groove portion 67 are substantially the same as the axial lengths of the engaging portions 75 and 85 of the protruding portions 74 and 84. The circumferential lengths of the first groove portion 66 and the second groove portion 67 are substantially the same as the circumferential lengths of the engaging portions 75 and 85 of the projecting portions 74 and 84.

  Here, the core 60 is formed of two types of thin plates having different shapes. As shown in FIG. 6A, the thin plate 68 has three cutouts 68a corresponding to the groove portions 65 formed on the outer peripheral surface. Further, as shown in FIG. 6B, the thin plate 69 has no notch formed on the outer peripheral surface. As shown in FIG. 3B, the thin plate 68 is used in a range A in which the groove portion 65 is formed in the axial direction of the core 60. That is, the range A of the core 60 is formed by stacking a plurality of thin plates 68. Further, the thin plate 69 is used in a range B where the groove portion 65 does not exist in the axial direction of the core 60. That is, the range B of the core 60 is formed by stacking a plurality of thin plates 69.

<Upper insulator 70>
As shown in FIG. 1, the upper insulator 70 is disposed at the upper end portion 60 a of the core 60. As shown in FIG. 4, the upper insulator 70 includes nine teeth 71 projecting radially inward, a substantially annular outer wall 72 formed at the radially outer end of the teeth 71, and It has the inner wall part 73 formed in the radial direction inner side edge part of the tooth | gear part 71, respectively. The nine teeth 71 are stacked on the nine teeth 62 of the core 60, respectively. The outer wall part 72 prevents the coil 90 wound around the tooth part 71 and the tooth part 62 of the core 60 from collapsing outward in the radial direction. Further, the inner wall portion 73 prevents the coil 90 from collapsing inward in the radial direction.

  Three protrusions 74 (first protrusions) are formed on the outer end portion (outer wall portion 72) of the upper insulator 70. The protruding portion 74 protrudes radially outward from the outer wall portion 72 and then protrudes toward the core 60 side. A portion protruding toward the core 60 side is an engaging portion 75.

<Lower insulator 80>
As shown in FIG. 1, the lower insulator 80 is disposed at the lower end 60 b of the core 60. The lower insulator 80 is disposed at the upper end portion 60a of the core 60 and has substantially the same configuration as the upper insulator 70. Have However, since the lower insulator 80 has substantially the same configuration as the upper insulator 70, a detailed description of these configurations is omitted.

<Features of Stator, Motor, and Compressor of this Embodiment>
The stator 10, the motor 8, and the compressor 1 of this embodiment have the following characteristics.

In the stator 10 of this embodiment, since the groove part 65 does not exist in the whole area in an axial direction, a core part can be increased compared with the conventional stator whose groove part is a through groove. Therefore, it can prevent that the groove part 65 formed in the outer peripheral surface of the core 60 obstructs the flow of magnetic flux, and reduces motor efficiency.
Further, since the core portion can be increased as compared with the conventional stator, the rigidity of the core 60 can be improved.
Further, in the conventional stator in which the groove portion is a through groove, oil stays in a portion of the groove portion that does not engage with the protruding portion of the insulator. However, in this stator 10, since the groove part 65 does not exist in the whole area in the axial direction, the amount of oil remaining in the groove part 65 can be reduced.

Moreover, in the stator 10 of this embodiment, the 1st groove part 66 of the core 60 engaged with the protrusion part 74 (1st protrusion part) of the upper insulator 70 (1st insulator), and the lower insulator 80 (2nd insulator). Since the second groove portion 67 of the core 60 that engages with the protruding portion 84 (second protruding portion) is in the same position in plan view, the core 60 can be formed by the two types of thin plates 68 and 69.
For example, when the first groove portion 66 and the second groove portion 67 are at different positions in plan view, a thin plate used in a range where the first groove portion 66 is formed and a thin plate used in a range where the second groove portion 67 is formed. In addition, three types of thin plates, ie, a thin plate (thin plate 69) used in a range where there is no groove 65 (range B shown in FIG. 3B) are required.
Therefore, in this stator 10, since the first groove 66 and the second groove 67 are in the same position in plan view, compared to the case where the first groove 66 and second groove 67 are in different positions in plan view. The type of thin plate forming the core 60 can be reduced.

  Further, in the stator 10 of the present embodiment, the groove portion 65 is disposed at a position corresponding to the tooth portion 62 on the outer peripheral surface of the core 60. That is, as shown in FIG. 3C, the groove 65 is disposed at a position where the influence on the flow of magnetic flux is small. Therefore, it can prevent that the groove part 65 formed in the outer peripheral surface of the core 60 obstructs the flow of magnetic flux.

  Further, in the motor 8 of the present embodiment, by using the stator 10 described above, the groove portion 65 formed on the outer peripheral surface of the core 60 can be prevented from obstructing the flow of magnetic flux, and the rigidity of the core 60 can be improved. The amount of oil remaining in the groove 65 can be reduced.

  Further, in the compressor 1 of the present embodiment, by using the motor 8 described above, the groove portion 65 formed on the outer peripheral surface of the core 60 can be prevented from obstructing the flow of magnetic flux, and the rigidity of the core 60 can be improved. The amount of oil remaining in the groove 65 can be reduced.

  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 meanings equivalent to the scope of claims for patent and all modifications within the scope.

  In the above-described embodiment, the groove portion 65 is disposed at a position corresponding to the tooth portion 62 on the outer peripheral surface of the core 60 (outside in the radial direction of the tooth portion 62), but the groove portion 65 is the slot 63 in the back yoke portion 61. It may be arranged in the radially outer portion.

  Moreover, in the said embodiment, although the 1st groove part 66 and the 2nd groove part 67 are in the same position in planar view, you may exist in a different position in planar view.

  Moreover, in the said embodiment, although the axial direction length of the 1st groove part 66 and the 2nd groove part 67 is substantially the same as the axial direction length of the engaging parts 75 and 85 of the protrusion parts 74 and 84, the protrusion part 74, It may be longer than the axial length of the 84 engaging portions 75 and 85.

  Moreover, in the said embodiment, although the core 60 is formed in cyclic | annular form, the core divided | segmented into plurality may be connected cyclically | annularly. The insulators 70 and 80 are each integrally formed in an annular shape, but may be formed by annularly connecting a plurality of divided insulators.

  By utilizing the present invention, it is possible to prevent the grooves formed on the outer peripheral surface of the core from obstructing the flow of magnetic flux, improve the rigidity of the core, and reduce the amount of oil remaining in the grooves.

DESCRIPTION OF SYMBOLS 1 Compressor 8 Motor 10 Stator 11 Rotor 60 Core 60a Upper end part (Axial direction one end part)
60b Lower end (the other end in the axial direction)
62 Tooth portion 65 Groove portion 66 First groove portion 67 Second groove portion 70 Upper insulator (first insulator)
74 Protrusion (first protrusion)
80 Lower insulator (second insulator)
84 Protrusion (second protrusion)

Claims (5)

An annular core having a plurality of teeth projecting radially inward;
An insulator disposed at an axial end of the core;
The insulator is
Having a protruding portion protruding from the outer end toward the core,
The core is
It is disposed on the outer peripheral surface of the axial end portion, and has a groove portion that engages with the protruding portion,
The stator, wherein the groove portion has substantially the same shape as the projecting portion and is not located in the entire region in the axial direction. The insulator has a first insulator disposed at one axial end portion of the core and a second insulator disposed at the other axial end portion of the core,
The first groove portion of the core that engages with the first protrusion of the first insulator and the second groove portion of the core that engages with the second protrusion of the second insulator are in the same position in plan view. The stator according to claim 1.   The stator according to claim 2, wherein the first groove portion and the second groove portion are arranged at positions corresponding to the tooth portions on the outer peripheral surface of the core.   A motor comprising the stator according to any one of claims 1 to 3 and a rotor disposed inside the stator.   A compressor comprising the motor according to claim 4.

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