WO2020017625A1

WO2020017625A1 - Motor and compressor provided therewith

Info

Publication number: WO2020017625A1
Application number: PCT/JP2019/028413
Authority: WO
Inventors: 宏北垣; 武本田; 彰太川島
Original assignee: 日本電産株式会社
Priority date: 2018-07-20
Filing date: 2019-07-19
Publication date: 2020-01-23
Also published as: JPWO2020017625A1

Abstract

This motor is provided with a rotor that rotates about a central axis extending in the up/down direction, a stator that faces opposite the rotor in the radial direction with a gap therebetween, and a cylindrical case in the interior of which the rotor and the stator are located. The stator includes: a plurality of core pieces having core back parts that are arranged annularly and extend along the circumferential direction and tooth parts that extend in the radial direction from the core back parts; and at least one annular ring member that is mounted onto an outer peripheral surface or an inner peripheral surface of the core back parts. The core pieces and the ring member(s) are steel sheet stacks formed of a plurality of magnetic steel sheets which are stacked together. The stator is fixed to an inner peripheral surface of the case via the ring member(s).

Description

Motor and compressor including the same

The present invention relates to a motor and a compressor using the motor. This application claims priority to and / or incorporates priority from U.S. Provisional Patent Application No. 62 / 700,961, filed July 20, 2018.

Generally, in a compressor, at least one of the outer peripheral surface of the stator core and the inner peripheral surface of the cylindrical housing needs to be provided with a passage (a groove or the like) through which the refrigerant passes. Therefore, when the stator core is fixed to the housing by press fitting or the like, a so-called round core is generally used as the compressor stator core in order to increase the contact area between the outer peripheral surface of the stator core and the inner peripheral surface of the housing as much as possible. It is a target. The round core is a stator core whose core back portion is not divided in the circumferential direction.

However, when a round core is used, it is necessary to secure a space for the nozzle between the slots. Therefore, the space factor of the round core is lower than that of a straight core or the like. When a round core is used, a method of painting an insulator instead of an insulator is also conceivable. When the insulator is abolished, there is a problem of insulation between the coil and the stator core when the conductor is to be wound by the thickness of the insulator. Therefore, it is conceivable to use a split core instead of the round core as the stator core of the compressor motor. The space factor of the split core is higher than that of the round core.

However, as described above, at least one of the outer peripheral surface of the stator core and the inner peripheral surface of the housing needs to be provided with a passage for allowing the coolant to pass therethrough. For this reason, if a split core is adopted as the stator core, the contact area between the core back and the housing is smaller than in the case of a round core stator core. Therefore, when the split core is fixed to the housing by press-fitting, the outer peripheral surface of the stator core and the inner peripheral surface of the housing come into partial contact with each other, not the entire circumference. As a result, the stator core of the split core cannot be firmly fixed to the housing. In addition, since the core pieces are partially in contact with each other, even when the core pieces of the split cores are arranged in a ring shape, the positions of the core pieces constituting the split cores may be shifted during press-fitting.

Therefore, it is an object of the present invention to provide a stator core for a compressor using a split core that can be easily assembled and a method of manufacturing the same.

A motor, a rotor that rotates about a central axis extending in the vertical direction, a stator radially opposed to the rotor with a gap therebetween, and a cylindrical case in which the rotor and the stator are located. Wherein the stator has a plurality of core pieces having a core back portion annularly arranged along a circumferential direction and a teeth portion extending radially from the core back portion and extending along the circumferential direction, and an outer peripheral surface of the core back or At least one annular ring member attached to an inner peripheral surface, wherein the stator is fixed to the inner peripheral surface of the case via the ring member.

FIG. 1 is a sectional view of a motor according to one embodiment. FIG. 2 is a perspective view of a stator piece according to one embodiment. FIG. 3 is a schematic diagram of a compressor provided with a motor according to one embodiment. FIG. 4 is a schematic diagram of a method of fixing the case and the stator in one embodiment. FIG. 5 is a perspective view of a motor according to one embodiment. FIG. 6 is a plan view of a motor according to one embodiment. FIG. 7 is a perspective view of a motor according to one embodiment. FIG. 8 is a plan view of a motor according to one embodiment. FIG. 9 is a plan view of a stator core and a ring member according to a modification. FIG. 10 is an enlarged plan view of a tooth portion according to a modification. FIG. 11 is a partially enlarged view of a sixth convex portion and a first concave portion according to a modification. FIG. 12 is a partially enlarged view of a fifth concave portion and a fourth convex portion according to a modification. FIG. 13 is a partially enlarged view of a second concave portion and a third convex portion according to a modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the scope of the present invention is not limited to the following embodiment, and can be arbitrarily changed within the technical idea of the present invention.

において In the drawings below, in order to make each configuration easy to understand, the scale, number, and the like of the actual structure and each structure may be different. In each figure, the Z axis is shown as appropriate. The Z-axis direction in each drawing is a direction parallel to the axial direction of the central axis J shown in FIG. In the following description, the positive side (+ Z side, one side) in the Z-axis direction is referred to as “upper side”, and the negative side (−Z side, the other side) in the Z-axis direction is referred to as “lower side”. Call. Note that the terms “upper side” and “lower side” are simply directions used for description, and do not limit the actual positional relationship or direction. Unless otherwise specified, a direction parallel to the central axis J (Z-axis direction) is simply called “axial direction”, a radial direction about the central axis J is simply called “radial direction”, and a central axis J , Ie, around the central axis J, is simply referred to as “circumferential direction”. Further, in the following description, “in plan view” means a state viewed from the axial direction.

(motor)
FIG. 1 is a cross-sectional view of a motor 1 according to the present embodiment. The motor 1 includes a rotor 10 that rotates about a central axis J that extends in the up-down direction, a stator 20 that radially opposes the rotor 10 via a gap, and a case 2. The motor 1 has a bearing and a bearing holder (not shown).

The case 2 accommodates each member constituting the motor 1. As shown in FIG. 1, the rotor 10 and the stator 20 are located inside the case 2. The case 2 has a cylindrical shape that opens to one or both of the upper side (+ Z side) and the lower side (−Z side). A bearing holder (not shown) is attached to the opening of the case 2.

(Rotor)
The rotor 10 has a shaft 11, a rotor core 12, and a plurality of rotor magnets 13. The shaft 11 extends in one direction around a center axis J extending in the up-down direction (Z-axis direction). The upper and lower ends of the shaft 11 are supported by bearings (not shown) so as to be rotatable around the central axis J. The rotor core 12 is fixed to the shaft 11. The rotor core 12 surrounds the shaft 11 in the circumferential direction. A plurality (ten in the present embodiment) of the rotor magnets 13 are fixed to the outer surface of the rotor core 12 along the circumferential direction. The plurality of rotor magnets 13 have N poles and S poles arranged alternately in the circumferential direction. The rotor core 12 and the rotor magnet 13 rotate together with the shaft 11. The magnet may be a single member instead of a plurality. Further, at least a part of the magnet may be embedded in the rotor core 12.

(Stator)
The stator 20 surrounds a radially outer side of the rotor 10. The stator 20 includes a plurality of stator pieces 30 arranged in a ring along the circumferential direction. In the stator 20, the stator pieces 30 adjacent in the circumferential direction are connected to each other. That is, the stator 20 is configured by connecting a plurality of stator pieces 30 along the circumferential direction. The stator 20 has at least one annular ring member R.

ステータ The stator 20 of the present embodiment has fifteen teeth portions 42. A slot 3 for accommodating the coil wire 21 is provided between the teeth 42. Since the rotor 10 has ten rotor magnets 13, the motor 1 of the present embodiment is a motor having 10 poles and 15 slots. In addition, the number of poles and the number of slots of the motor are not limited to the present embodiment, and are appropriately selected depending on a required output, a winding method, and the like. However, by selecting a combination in which the ratio of the number of poles / the number of slots is 2/3, the winding of the coil wire 21 becomes easy.

(Stator piece)
Next, the configuration of the stator piece 30 of the present embodiment will be described. FIG. 2 is a perspective view of the stator piece 30.

Although not shown, the stator piece 30 of the stator 20 includes a core piece 40, an upper insulator 50A, a lower insulator 50B, an insulating sheet (not shown), and a coil wire 21.

The core piece 40 is configured by stacking a plurality of plate members having a substantially T-shape in plan view along the axial direction. Therefore, the core piece 40 has a uniform shape along the axial direction.

The core piece 40 has a core back portion 41, a teeth portion 42, and an umbrella portion 43. As shown in FIG. 1, the core pieces 40 are arranged side by side in the circumferential direction to form a stator core 201 of the stator 20.

The core back portion 41 is arranged in a ring along the circumferential direction and extends along the circumferential direction. The core back portion 41 is connected to the core back portion 41 of the adjacent core piece 40 at an end 41b facing the circumferential direction. The core back portion 41 has a first facing surface 41a facing radially inward.

The teeth portion 42 extends radially inward from the center in the circumferential direction of the core back portion 41. The width of the teeth 42 along the circumferential direction is uniform. The teeth portion 42 has a pair of side surfaces 42A facing in the circumferential direction. The coil wire 21 is wound around the teeth portion 42 via an upper insulator 50A, a lower insulator 50B, and an insulating sheet. In the present embodiment, the winding method of the coil wire 21 is a concentrated winding.

Umbrella part 43 is located at the tip (radially inner end part) of teeth part 42. The umbrella part 43 is wider in the circumferential direction than the teeth part 42. That is, the dimension of the umbrella section 43 along the circumferential direction is larger than the dimension of the teeth section 42 along the circumferential direction. The dimension of the umbrella section 43 along the circumferential direction is smaller than the dimension of the core back section 41 along the circumferential direction. The surface of the umbrella portion 43 facing radially inward faces the rotor magnet 13 of the rotor 10. The umbrella unit 43 has a second facing surface 43a facing radially outward. The second opposing surface 43a radially opposes the first opposing surface 41a of the core back portion 41. The coil wire 21 passes between the first facing surface 41a and the second facing surface 43a.

The core piece 40 has an upper surface 40b and a lower surface 40c. The upper surface 40b and the lower surface 40c are provided with round holes (concave portions) (not shown). The round hole is located at the center in the circumferential direction of the core back portion 41. The upper insulator 50A and the lower insulator 50B have a protrusion (not shown) extending in the axial direction. The protrusion is inserted into the round hole. Thereby, the upper insulator 50A and the lower insulator 50B are fixed to the core piece 40.

The insulating sheet is made of an insulating resin material such as polypropylene terephthalate (PET). Note that the material forming the insulating sheet is not particularly limited as long as the material has insulating properties and can be bent. The insulating sheet has a uniform thickness to obtain a desired insulating performance.

(Compressor)
FIG. 3 is a schematic diagram of a compressor (compressor) 100 provided with the motor 1 of the present embodiment. The compressor 100 of the present embodiment includes the motor 1, a compression mechanism 101 located below the motor 1, a case 109, and an accumulator 108.

The compression mechanism unit 101 includes an eccentric rotor 103 and a cylinder 102 surrounding the eccentric rotor 103. The eccentric rotor 103 is connected to the shaft 11 of the motor 1 and rotates with the driving of the motor 1. The compressor rear part 101 is linked with the motor 1.

The case 109 houses the motor 1 and the compression mechanism 101. The suction pipe 104 and the discharge pipe 105 are connected to the case 109. Lubricating oil is supplied to the lubricating oil reservoir 107 inside the case 109, and the operation of the compression mechanism 101 is smoothened.
The refrigerant (cooling gas) and the lubricating oil are stored in the accumulator 108 in a separated state. The refrigerant separated in the accumulator 108 is supplied to the compression mechanism 101 inside the case 109 via the suction pipe 104.

The compressor 100 rotates the eccentric rotor 103 of the compression mechanism 101 as the motor 1 is driven. Thereby, the compressor 100 draws the refrigerant from the suction pipe 104 into the cylinder 102 and compresses the refrigerant in the compression mechanism 101. The compressed refrigerant passes around and inside the motor 1 and is discharged from a discharge pipe 105 provided at an upper part of the case 109.

Hereinafter, a method of fixing the stator 20 to the case 109 will be described with reference to FIG. FIG. 4 is a schematic diagram of a method of fixing the stator 20 and the case 109 in one embodiment. The case 109 in FIG. 4 simplifies the case 109 in FIG. 3 and shows only a part in the axial direction. The stator 20 includes a plurality of stator pieces 30 arranged in a ring along the circumferential direction. In the stator 20, the stator pieces 30 adjacent in the circumferential direction are connected to each other. That is, the stator 20 is configured by connecting a plurality of stator pieces 30 along the circumferential direction.

(Ring member)
The stator 20 has at least one annular ring member R. Specifically, a cylindrical ring member R is attached to the outer peripheral surface of the stator 20 (the outer peripheral surface of the core back portion 41). The ring member R is attached to the outer peripheral surface of the core back portion 41 by press-fitting, shrink fitting, or the like, for example, in a state where the split cores are arranged in an annular shape. In the present embodiment, the ring member R contacts the entire periphery of the core back portion 41 of the stator core 201. Thereby, the ring member R can hold each stator piece 30 in an annular shape. As a result, for example, when the stator is moved, the core piece 40 can be easily moved to a machine or the like while maintaining the annular state.

As described above, the case 109 houses the motor 1 and the compression mechanism 101. The case 109 is a cylindrical member extending in the axial direction. In the present embodiment, the case 109 has a tubular portion and a lid. The tubular portion is a tubular member extending in the axial direction. The lid portion extends radially inward from one axial end of the cylindrical portion. In the present embodiment, when viewed from the axial direction, the lid is annular. The material of the case 109 is, for example, aluminum. However, the material of the case 109 may be a material other than aluminum, such as SUS, and is not particularly limited.

ステータ The stator with the ring member R attached is held inside the case 109. The stator 20 to which the ring member R is attached is fixed in the cylindrical portion of the case 109 by, for example, shrink fitting or press fitting.

As described above, at least one of the outer peripheral surface of the core back 41 and the inner peripheral surface of the case 109 is provided with a groove through which the refrigerant passes and extends in the axial direction. Therefore, when the outer peripheral surface of the core back 41 directly contacts the inner peripheral surface of the case 109, the contact area is smaller than that of the structure in which the groove is provided.

However, since the ring member R is attached to the outer peripheral surface of the stator core 201, the outer peripheral surface of the ring member R contacts the inner peripheral surface of the case 109 over the entire circumference. In other words, the stator core 201 is indirectly fixed to the case 109 via the ring member R. The area where the inner peripheral surface of the case 109 contacts the outer peripheral surface of the ring member R is larger than when the outer peripheral surface of the core back 41 directly contacts the inner peripheral surface of the case 109. Therefore, the stator 20 can be firmly fixed inside the case 109 via the ring member R. In other words, the stator 20 is fixed to the inner peripheral surface of the case 109 via the ring member R.

In the present embodiment, only one ring member R is attached to the outer peripheral surface of the stator core 201. However, a plurality of ring members R may be attached to the outer peripheral surface of stator core 201. In this case, the ring members R are preferably arranged in the axial direction.

形状 Further, the shape of the ring member R is not necessarily limited to a cylindrical shape. The shape of the ring member R may be, for example, a substantially C-shape when viewed from the axial direction. In this case, it is preferable that the plate-shaped member be bent and attached to the outer peripheral surface of the stator core 201.

As shown in FIGS. 5 to 8, the material of the ring member may be, for example, the same electromagnetic steel plate as the stator core. In this case, it is desirable that the ring member RA be co-produced with the stator core 201A. That is, both the ring member RA and the stator core 201A are manufactured from the same electromagnetic steel sheet in which one or a plurality of sheets are laminated by press working or the like.

プレス In the press working for co-machining, for example, a progressive die is used. For the press in the progressive die, for example, an electromagnetic steel plate having a thickness T = 0.2 mm to 0.5 mm can be used. Further, when the outer diameter of the stator core 201A is in the vicinity of φ100 mm, the range of the tolerance can be set to 80 μm, which is different from the normal range.

The core piece and the ring member RA are laminated steel sheets in which a plurality of electromagnetic steel sheets are laminated. By using the same electromagnetic steel plate as that of the stator core 201A as the material of the ring member RA, it is possible to prevent the stator core 201A composed of a plurality of core pieces from being decomposed due to stress concentration at the time of shrink fitting or press fitting, for example. it can. Further, the ring member RA does not need to be made of a different material, so that costs and the like can be reduced.

As a method of punching the ring member RA from an electromagnetic steel plate (that is, a laminated steel plate), for example, there is a method of performing pushback on the laminated steel plate and taking out the ring member RA and the stator core 201A as an integrated product.

In addition, as a method of punching the ring member from the electromagnetic steel sheet, the stator core 201A is punched out from a laminated steel sheet in which two or more electromagnetic steel sheets are stacked, and then, from the laminated steel sheet obtained by punching the stator core, the ring member RA is further extracted. There is a way to punch out.

締結 For fastening the stamped stator core 201A and the ring member RA, for example, there is a method in which an adhesive is applied and fixed between the outer peripheral surface (core back portion) of the stator core 201A and the inner peripheral surface of the ring member RA. In this case, when viewed from the axial direction, it is desirable that the outer shape of the outer peripheral surface of the stator core 201A and the outer shape of the inner peripheral surface of the ring member RA have the same shape (for example, circular).

Further, the fastening between the stator core 201A and the ring member RA is performed by using a deviation of a burr surface, a sagging surface, or a translocation (rotating the direction of the electromagnetic steel plates when laminating the cores and laminating) of the stator core 201A. It may be done by making a slight interference and press-fitting.

In addition, the fastening between the stator core 201A and the ring member RA changes the distance between the central axis and the outer peripheral portion of the stator core 201A (the outer peripheral surface of the core back) for each circumferential position (angle) from the central axis as a starting point, A margin may be provided between the ring member RA and the stator core 201A and the ring member RA may be fixed by press fitting or the like.

As shown in FIGS. 7 and 8, the stator core 201A may be punched out and taken out as described above. When the ring member RA is manufactured by a method of further punching the ring member RA from the electromagnetic steel sheet after the stator core 201A has been punched, the ring member RA is arranged radially outside the stator core 201A. Thereafter, the punched ring member RA may be faced (applied a force from the axial direction) so that the inner peripheral surface of the ring member RA protrudes so as to reduce the inner diameter of the ring member. Thus, the inner peripheral surface of the ring member comes into contact with the outer peripheral surface of the stator core, and at least one of the inner peripheral surface of the ring member and the outer peripheral surface of the stator core undergoes elastic deformation or plastic deformation. As a result, the ring member and the stator core can be fastened. Preferably, an engagement projection RA1 protruding radially outward is formed on the inner peripheral surface of the ring member RA, and the engagement projection RA1 engages with an engagement recess 201A1 provided on the outer peripheral surface of the stator core. 7 and 8, the outer peripheral surface of the stator core 201A faces the inner peripheral surface of the ring member RA via a gap. The gap is located between the adjacent tooth portions 42A in the circumferential direction. A bumper may be arranged in the gap. The inner peripheral surface of the ring member RA has a first inner peripheral surface RAS1 and a second inner peripheral surface RAS2. The inner peripheral surface of the ring member RA has a ∨-shaped surface due to the first inner peripheral surface RAS1 and the second inner peripheral surface RAS2. The inner peripheral surface of the stator core 201A has a third inner peripheral surface 201A3 and a fourth inner peripheral surface 201A4. The inner peripheral surface of the stator core 201A has a ∨-shaped surface due to the third inner peripheral surface 201A3 and the fourth inner peripheral surface 201A4. The first inner peripheral surface RAS1 and the third inner peripheral surface 201A3 are preferably parallel. The second inner peripheral surface RAS2 and the fourth inner peripheral surface 201A4 are preferably parallel.

Furthermore, the stator core and the ring member may have other shapes than those described above. 9 to 13 show shapes of a stator core and a ring according to another modification. FIG. 9 is a plan view of a stator core and a ring member according to a modification of the present invention. FIG. 10 is an enlarged plan view of a tooth portion (a portion surrounded by a circle in FIG. 9) according to a modification of the present invention. FIG. 11 is a partially enlarged view of a sixth convex portion and a first concave portion according to a modification of the present invention. FIG. 12 is a partially enlarged view of a fifth concave portion and a fourth convex portion according to a modification of the present invention. FIG. 13 is a partially enlarged view of a second concave portion and a third convex portion according to a modification of the present invention.

ステータ Similarly to the above, the stator core 201B and the ring RB shown in FIGS. 9 to 13 are formed by punching, laminating and fixing (for example, caulking, welding, etc.) electromagnetic steel plates. In FIG. 9, the core back portion 41B of the stator core 201B is fixed to the ring portion RB by press fitting or the above-described method.

コア When viewed from the axial direction, the core piece 40B has a substantially T-shaped outer shape. The core back part 41B of the core piece 40B is provided with a first recess 41B1 that is recessed radially inward. In other words, a first recess 41B1 that is recessed radially inward is formed on the outer peripheral surface of the core back portion 41B of the core piece 40B. The circumferential position of the first concave portion 41B1 is substantially the same as the circumferential position of the tooth portion 42B. That is, the first concave portion 41B1 is located radially outside the tooth portion 42B.

第 A second recess 41B2 is formed at one end in the circumferential direction of the core piece 40B so as to be recessed toward the other side in the circumferential direction. At the other end in the circumferential direction of the core piece 40B, a third convex portion 41B3 that protrudes toward one side in the circumferential direction is provided. More specifically, a second concave portion 41B2 that is recessed toward the other side in the circumferential direction is formed at one end in the circumferential direction of the core back portion 41B, and is formed at the other end in the circumferential direction of the core back portion 41B. A third convex portion 41B3 protruding toward the other side in the circumferential direction is formed.

One core piece 40B is circumferentially adjacent to another core piece 40B. The third convex portion 41B3 of another core piece 40B located on the other side in the circumferential direction fits into the second concave portion 41B2 of one core piece 40B. Thereby, one core piece 40B and another core piece 40B that are adjacent in the circumferential direction are connected. Preferably, the third convex portion 41B3 is fixed to the second concave portion 41B2 by press fitting. In this case, one core piece 40B and one end (or the other side) in the circumferential direction and the other end (or one side) in the circumferential direction of the other core piece 40B are in contact with each other, and the one core piece 40B and A boundary with another core piece 40B is formed. A fourth convex portion 41B4 projecting radially outward is formed at a radially outer portion of the boundary. The fourth convex portion 41B4 is a portion of one core piece 40B and a radially outer portion of one circumferential end (or the other side) and another circumferential end of the other core piece 40B (or one end). It is composed of at least one of the radially outer parts.

The ring portion RB is located radially outside the core back portion 41B. The inner peripheral surface of the ring portion RB is fixed to a part of the outer peripheral surface of the core back portion 41B by press fitting. A fifth recess RB5 recessed radially outward is formed on the inner peripheral surface of the ring portion RB. In the circumferential direction, the position of the fifth concave portion RB5 is the same as the position where the second concave portion 41B2 and the third convex portion 41B3 are combined. At least a part of the fourth protrusion 41B4 is accommodated in the fifth recess RB5. Thereby, when the third convex portion 41B3 and the second concave portion 41B2 are combined, the outer peripheral surfaces of the core pieces 40B adjacent in the circumferential direction are deformed, and the ring member RB is prevented from being deformed from a predetermined shape. be able to.

A sixth convex portion RB6 is formed on the inner peripheral surface of the ring member RB so as to protrude radially inward. The sixth convex portion RB6 protrudes radially inward from the inner peripheral portion of the ring member RB. The circumferential position of the sixth convex portion RB6 is the same as the circumferential position of the first concave portion 41B1. At least a part of the sixth protrusion RB6 is accommodated in the first recess 41B1. More specifically, at least a part of the sixth convex portion RB6 is arranged in the first concave portion 41B1 with a gap.

溝 On the inner peripheral surface of the ring member RB, on both sides in the circumferential direction of the sixth convex portion RB6, groove portions RB61 recessed outward in the radial direction are respectively formed.

内 The inner surface of the first recess 41B1 has a first recess inner wall 41B11, a second recess inner wall 41B12, a third recess inner wall 41B13, and a fourth recess inner wall 41B14. The first recess inner wall portion 41B11 is a portion extending along the circumferential direction. When viewed from the axial direction, the first recess inner wall portion 41B11 is substantially straight.

The pair of second recess inner wall portions 41B12 extend radially outward from both circumferential sides of the first recess inner wall portion 41B11. The pair of second recess inner wall portions 41B12 extend in a direction away from each other in the circumferential direction. When viewed from the axial direction, the second recess inner wall portion 41B12 extends linearly.

The third recess inner wall portion 41B13 extends radially outward from a radially outer end of the second recess inner wall portion 41B12. When viewed from the axial direction, the pair of third recess inner wall portions 41B13 extend substantially linearly. When viewed from the axial direction, the third recess inner wall portion 41B13 is substantially parallel.

The pair of fourth recess inner wall portions 41B14 extend radially outward from radially outer ends of the pair of third inner wall portions 41B13, and extend in a direction away from each other in the circumferential direction.

When viewed from the axial direction, the first protrusion inner wall RB61, which is the radially inner end of the sixth protrusion RB6, has a substantially linear shape extending in the circumferential direction. The first convex inner wall RB62 radially opposes the first concave inner wall 41B11. The pair of second protrusion inner walls RB62 located on both circumferential sides of the first protrusion inner wall 41B11 extend in the radial direction and are substantially parallel.

The second projection inner wall RB62 faces the third recess inner wall 41B13 in the circumferential direction.

The third convex inner wall 41B13 extends radially outward from the radial outer end of the second convex inner wall RB62. The pair of third convex portion inner walls RB63 extend apart from each other in the circumferential direction. The third convex third convex inner wall RB63 faces the fourth concave inner wall 41B14 at least in the radial direction.

空間 A space is formed by the first to third convex inner walls RB61 to RB63 and the first to fourth concave inner walls 41B11 to 41B14. In other words, a space is formed between the sixth convex portion RB6 and the first concave portion 41B1. In addition, as described above, when viewed from the axial direction, there is a linear portion on the inner wall constituting the space formed between the sixth convex portion RB6 and the first concave portion 41B1, and therefore, will be described later. As described above, when the pushback is performed, the jig is fitted into the space, and the processing can be easily performed using the straight line portion.

In addition, even when the core back portion 41B is fixed to the ring member RB by press-fitting or the like, the above-described configuration suppresses a portion around the inner wall of the first recess from being plastically deformed. As a result, the area of the magnetic path in the core back portion is suppressed from being reduced, and the magnetic flux can efficiently flow when the motor is driven.

として As an example of a method of manufacturing the stator core 201B and the ring member RB shown in FIG. 9, for example, first, one or more electromagnetic steel sheets are stacked to form a laminated steel sheet. Next, a portion to be a rotor core (not shown) is punched from the laminated steel plate. Next, the core back portion, the teeth portion, and the ring portion are further punched from the laminated steel plate from which the rotor core has been punched. Furthermore, push-back (push-BACK) is performed at the joint between the tooth portion 42B and the ring member RB and at the end of the core back portion 41B adjacent in the circumferential direction. A space is formed between the core back portion 41B and the ring member RB by pushback. That is, the method for manufacturing the motor 1 according to the present invention includes a step of laminating one or more electromagnetic steel sheets to form a laminated steel sheet. Further, a step of taking out a portion to be a rotor core (not shown) from the laminated steel sheet is included. Further, the method further includes a step of taking out the core back portion, the teeth portion, and the ring portion from the same laminated steel plate after taking out the rotor core. Further, a step of forming a space by pushback between the core back portion 41B and the ring member RB is included.

Thereby, the first concave portion 41B1, the second concave portion 41B2, the third convex portion 41B3, the fourth convex portion 41B4, the fifth concave portion RB5, and the sixth convex portion RB6 are formed. Ring member RB and teeth portion 42B are fixed by shrink fitting or press fitting. That is, the portions on the outer circumferential surface of the teeth portion 42B on both circumferential sides of the first concave portion 41B1 and the inner circumferential surface of the ring member RB are fixed by shrink fitting or press fitting.

巻線 The winding method of the coil wire 21 is not limited to concentrated winding, but may be another kind of winding method such as distributed winding, wave winding, lap winding, full-section winding, or short-section winding.

種類 The type of compressor is not limited to the one described above, and may be another type of compressor. The motor having the above-described stator piece can be used in devices other than the compressor.

Claims

A motor,
A rotor that rotates about a central axis extending in a vertical direction,
A stator radially opposed to the rotor via a gap,
A cylindrical case in which the rotor and the stator are located,
With
The stator is
A plurality of core pieces having a core back portion annularly arranged along the circumferential direction and teeth portions extending radially from the core back portion and extending along the circumferential direction,
At least one annular ring member attached to an outer peripheral surface or an inner peripheral surface of the core back;
Has,
The core piece and the ring member are laminated steel sheets in which a plurality of electromagnetic steel sheets are laminated,
The stator is fixed to an inner peripheral surface of the case via the ring member.
The motor according to claim 1, wherein the rotor is a laminated steel sheet in which a plurality of electromagnetic steel sheets are laminated.
The motor according to claim 1 or 2,
The ring member is fixed to the core back by press fitting.
The motor according to any one of claims 1 to 3, wherein
The stator is fixed in the case by shrink fitting via the ring member.
The motor according to any one of claims 1 to 4,
When viewed from the axial direction, the outer shape of the ring member is substantially C-shaped.
The motor according to any one of claims 1 to 5,
A plurality of the ring members are attached to the core back.
The motor according to any one of claims 1 to 6, wherein
The ring member has a sixth protrusion protruding radially inward,
On the outer peripheral surface of the core back portion, a first concave portion is formed that is concave inward in the radial direction,
At least a part of the sixth convex portion is disposed in the first concave portion with a gap.
The motor according to any one of claims 1 to 7,
A second concave portion that is concave toward the other side in the circumferential direction is formed at one end in the circumferential direction of the core back portion,
A third protrusion protruding toward the other side in the circumferential direction is formed at the other end in the circumferential direction of the core back portion,
One of the core pieces is circumferentially adjacent to the other of the core pieces,
The third convex portion of the other core piece fits into the second concave portion of the one core piece.
A compressor,
A motor according to any one of claims 1 to 8,
A compression mechanism interlocked with the motor;
Having.
It is a manufacturing method of the motor according to any one of claims 1 to 9,
The core back portion and the ring member are taken out of the same laminated steel plate;
A configuration in which a space configured by pushback is configured between the core back portion and the ring member;
A step in which the ring member and the core back member are fixed by shrink fitting;
including.