JP6574345B2 - Electric motor and compressor - Google Patents

Description

  The present invention relates to an electric motor, and more particularly to an electric motor that winds a stator winding using a concentrated winding method.

As an electric motor that drives equipment (for example, an air conditioner, a compressor mechanism of a compressor provided in a cooling device, a refrigeration device, etc., a vehicle, an in-vehicle device mounted on the vehicle), a stator and a stator An electric motor having a rotor that is rotatably arranged is used. The stator has a stator core and a stator winding. The stator core includes a yoke portion extending along the circumferential direction, a teeth base portion extending from the yoke portion along the radial direction, and a tooth tip portion extending along the circumferential direction formed on the tip side of the teeth base portion. It has the teeth part which has. The stator winding is wound around the teeth base portion of the teeth portion. The stator winding is generally composed of a copper wire and an insulating film covering the outer periphery of the copper wire. As a method of winding the stator winding around the teeth base, a distributed winding method or a concentrated winding method is used.
An electric motor using a concentrated winding method as a method of winding the stator winding around the teeth base is disclosed in Patent Document 1. In the electric motor disclosed in Patent Document 1, end insulating members are arranged on both axial sides of the stator core. The end insulating member is disposed at a position facing the yoke portion and the tooth tip portion of the stator core, and is disposed at a position facing the outer wall portion and the inner wall portion extending along the circumferential direction and the teeth base portion of the stator core. The connecting portion is disposed and extends along the radial direction between the outer wall portion and the inner wall portion. The stator winding is wound around the connecting portion between the teeth base of the stator core and the end insulating member in a state where the end insulating members are arranged on both sides in the axial direction of the stator core.
Here, in the outer peripheral surface of the connecting portion of the end insulating member, when the corner portion in the region where the stator winding is wound is formed in a pin angle (90 ° square shape), the pin angle of the connecting portion There is a possibility that the insulation coating of the stator winding may be damaged due to the contact with the corner portion, resulting in poor insulation. For this reason, in the electric motor disclosed in Patent Document 1, the corner portion of the connecting portion of the end insulating member is formed on the R surface (arc surface).

JP 2001-268835 A

In recent years, there has been a demand for a small and high output motor. As a solution, a method of winding the stator winding while pulling it with a strong force is considered. By using this method, the stator winding can be wound at a high density, and the output of the electric motor can be increased without increasing the size of the stator core.
Here, in the electric motor disclosed in Patent Document 1, when the stator winding is wound while being pulled with a strong force, the stator winding closely adheres along the R surface of the corner portion, The compressive stress applied to the region on the corner (R surface) side and the tensile stress applied to the region on the opposite side of the corner (R surface) increase. For this reason, wrinkles due to compressive stress are generated in the insulating coating on the corner side of the stator winding, or cracks due to tensile stress are generated on the insulating coating on the side opposite to the corner of the stator winding. It may occur and the insulating coating may be damaged.
The present invention has been devised in view of such points, and an electric motor while preventing damage to a stator winding (stator winding wound by a concentrated winding method) wound using an end insulating member. It aims at providing the technique which can raise the output of.

One invention relates to an electric motor. The electric motor of the present invention includes a stator and a rotor arranged to be rotatable relative to the stator. The electric motor of the present invention can be configured as various types of electric motors including a stator and a rotor, for example, a permanent magnet electric motor or an induction motor.
The stator includes a stator core, end insulating members disposed on both sides in the axial direction of the stator core, and a stator winding. Preferably, positioning means for positioning the end insulating member on the stator core is provided.
The stator core has a yoke portion extending along the circumferential direction and a teeth portion extending along the radial direction from the yoke portion when viewed from a direction perpendicular to the axial direction. The teeth part has a teeth base part extending along the radial direction from the yoke part, and a teeth tip part provided on the tip side (rotation center side) of the tooth base part and extending along the circumferential direction. The end insulating member includes an outer wall portion and an inner wall portion extending along the circumferential direction when viewed from a direction perpendicular to the axial direction, and a connecting portion extending along the radial direction between the outer wall portion and the inner wall portion. Have. The outer wall portion, the inner wall portion, and the connecting portion of the end insulating member are arranged at positions facing the yoke portion, the tooth tip portion, and the tooth base portion of the stator core. The stator winding is wound around the connecting portion of the end insulating member and the tooth portion (tooth base portion) of the stator core. That is, the stator winding is wound by a concentrated winding method. As the stator winding, a stator winding made of a copper wire and an insulating film covering the periphery of the copper wire and having a wire diameter in the range of 0.6 mm to 1.4 mm is used.
And the outer peripheral surface of the connection part of an edge part insulation member cross | intersects the bottom face extended along the extension direction of the end surface of a stator core, and the extension direction of a bottom face seeing in the cross section along the circumferential direction. First and second side surfaces extending in a direction, a top surface extending in a direction intersecting with the extending direction of each of the first and second side surfaces, and formed between the first side surface and the top surface. A first cut surface extending in a direction intersecting with the extending direction of each of the first side surface and the top surface, and formed between the second side surface and the top surface, and each of the second side surface and the top surface It has the 2nd cut surface extended in the direction which cross | intersects the extension direction. The bottom surface, top surface, first and second side surfaces, and first and second cut surfaces are formed in a planar shape.
An angle θ1 formed by the extension line of the first side surface and the extension line of the first cut surface, an angle θ2 formed by the extension line of the first cut surface and the extension line of the top surface, and an extension line of the top surface The angle θ3 formed by the extension line of the second cut surface, and the angle θ4 formed by the extension line of the second cut surface and the extension line of the second side surface are within the range of 130 ° and 140 ° ([130 ° ≦ θ1, θ2, θ3, θ4 ≦ 140 °]). The angles θ1 to θ4 are angles formed on the center side (opposite side of the stator winding) of the connecting portion. In addition, the description “an extended line on the first side surface” means “a line along the surface of the first side surface” or “a line obtained by extending a line along the surface of the first side surface”. The same applies to other aspects. In addition, when the end insulating member is formed of resin, the connecting portion of each surface may have a curved surface shape, for example, an arc surface shape with a radius of about 0.2 mm to 0.4 mm due to dimensional tolerance.
Moreover, the length H between the connection points of the extended line of the top surface and the extended lines of the first and second cut surfaces, the extended line of the first cut surface and the extended lines of the first side surface and the top surface, respectively. And the length N between the connection points of the extension line of the second cut surface and the extension lines of the second side surface and the top surface are the wire diameter D ( mm)) ([L, M, N ≧ 2 × D]).
In the present invention, even if the stator winding is wound around the connecting portion of the end insulating member and the teeth portion of the stator core while being pulled with a strong force, it is between the first and second cut surfaces and the stator winding. Since a gap is generated in the stator winding, the compressive stress applied to the inner diameter side (first cut surface side, second cut surface side) and the outer diameter side (opposite side of the first cut surface, second side) of the stator winding It is possible to prevent an increase in tensile stress applied to the side opposite to the cut surface) and to prevent damage to the stator winding. Therefore, a small and high output motor can be provided .
In a different form of the invention , the first and second side surfaces extend in a direction perpendicular to the extending direction of the bottom surface (including "substantially right angle"), and the top surface is the first and second side surfaces. It extends in a direction perpendicular to the extending direction (including “substantially right angle”), that is, in a direction parallel to the extending direction of the bottom surface (including “substantially parallel”).
In this embodiment, the end insulating member can be easily formed.
Another invention relates to a compressor.
The compressor of the present invention includes a compression mechanism section and an electric motor that drives the compression mechanism section. Any of the above-described electric motors is used as the electric motor.
The present invention has the same effect as each electric motor described above.

  In the electric motor and compressor of the present invention, the output can be increased while preventing damage to the stator winding wound using the end insulating member.

It is a figure which shows schematic structure of one Embodiment of the compressor of this invention. It is a figure which shows schematic structure of the stator of one Embodiment of the electric motor of this invention. It is an enlarged view of the part III of FIG. It is an enlarged view of the part IV of FIG. It is a figure which shows the connection part of the conventional edge part insulation member. It is a figure which shows the connection part of the other conventional edge part insulation member. It is a figure which shows the connection part of the edge part insulation member used with the electric motor of one Embodiment. It is an enlarged view of the part VIII of FIG. It is a figure explaining the structure of the connection part of the edge part insulation member used with the electric motor of one Embodiment. It is a figure which shows the model which measures the relationship between the angle formed by each surface of the connection part of an edge part insulation member, and the thickness of the insulating film of a stator winding. It is a graph which shows the relationship between the angle formed by each surface of the connection part of an edge part insulation member, and the thickness of the insulating film of a stator winding. It is a figure which shows the model which measures the relationship between the length of the cut surface of the connection part of an edge part insulation member, and the thickness of the insulation film of a required stator winding. It is a graph which shows the relationship between the length of the cut surface of the connection part of an edge part insulation member, and the thickness of the insulation film of a required stator winding. It is a figure which shows the model which measures the relationship between the length of the top face of the connection part of an edge part insulation member, and the thickness of the insulation film of a required stator winding. It is a graph which shows the relationship between the length of the top face of the connection part of an edge part insulation member, and the thickness of the insulation film of a required stator winding.

Below, the electric motor and compressor of this invention are demonstrated with reference to drawings.
In the present specification, the “axial direction” indicates the direction of a line (rotation center line) passing through the center of the rotor in a state where the rotor is rotatably arranged with respect to the stator. The “circumferential direction” is a circle centered on the rotation center line when viewed in a cross section perpendicular to the axial direction (direction of the rotation center line) in a state where the rotor is rotatably arranged with respect to the stator. Indicates the circumferential direction. Further, the “radial direction” indicates a direction passing through the rotation center line when viewed in a cross section perpendicular to the axial direction (direction of the rotation center line) in a state where the rotor is rotatably arranged with respect to the stator. .

One embodiment of the compressor of the present invention is shown in FIG. A compressor 10 according to an embodiment shown in FIG. 1 includes a sealed container 20, a compression mechanism unit 30, an electric motor 100, and an accumulator 40.
The compression mechanism unit 30 and the electric motor 100 are arranged in a sealed state in the sealed container 20. The sealed container 20 is provided with a discharge port 21 and a suction port 22. An oil sump 33 is provided below the compression mechanism 30 to store lubricating oil supplied to a bearing portion of the rotating shaft 180 of the electric motor 100, a sliding portion of the compression mechanism 30, and the like.
The compression mechanism unit 30 includes a cylinder 31 and an eccentric rotor 32 that is driven by the rotating shaft 180 of the electric motor 100.
In the present embodiment, the electric motor 100 is configured as a permanent magnet electric motor. The electric motor 100 has a stator 110 and a rotor 160. The stator 110 includes a stator core 120, end insulating members 140 and 150, and a stator winding 130. The stator 110 will be described later. The rotor 160 has a rotor core 170 and a rotation shaft 180. The rotor core 170 is composed of a plurality of laminated electromagnetic steel plates. In the rotor core 170, a plurality of magnet insertion holes 171 into which the permanent magnets 172 are inserted are formed along the axial direction. The rotor core 170 is integrated by caulking pins 175 in a state where end plates 173 and balance weights 174 are disposed on end surfaces on both axial sides.
The accumulator 40 separates the cooling medium (for example, cooling gas) and the lubricating oil. The cooling medium separated by the accumulator 40 is supplied to the suction port 22 via the suction pipe 41. The lubricating oil separated by the accumulator 40 is supplied to the oil sump 33.

  The compression mechanism unit 30 compresses the cooling medium sucked from the suction port 22 in the cylinder 31 as the eccentric rotor 32 rotates. The cooling medium compressed by the compression mechanism unit 30 is discharged from the discharge port 21 through a passage provided in the electric motor 100. As a passage through which the cooling medium passes, for example, a groove formed by a notch surface formed along the axial direction on the outer periphery of the stator core 120 and an inner peripheral surface of the hermetic container 20, the stator core 120 or the rotor core 170. In addition, holes formed along the axial direction, gaps formed between the inner peripheral surface of the stator core 120 and the outer peripheral surface of the rotor core 170 are used.

Next, the configuration of the stator 110 of the electric motor 100 will be described with reference to FIGS. FIG. 2 is a diagram illustrating a schematic configuration of the stator 110. In FIG. 2, the stator winding 130 is not shown. 3 is a view of the portion III of FIG. 2 from a direction perpendicular to the axial direction, and FIG. 4 is a view of the portion IV of FIG. 2 seen from a direction perpendicular to the axial direction.
The stator 110 includes a stator core 120, a stator winding 130 (see FIG. 1), and end insulating members 140 and 150.

Stator core 120 is composed of a plurality of laminated electromagnetic steel plates. The stator core 120 has end faces 120A and 120B on both sides in the axial direction.
The stator core 120 includes a yoke portion 121 extending along the circumferential direction and a plurality of teeth portions 122 extending along the radial direction when viewed from a direction perpendicular to the axial direction. The teeth portion 122 is provided on the tooth base portion 122a extending inward (rotation center side) along the radial direction from the yoke portion 121, and on the distal end side (rotation center side) of the teeth base portion 122a, and extends along the circumferential direction. It has the tooth | gear front-end | tip part 122b which exists. A tooth tip surface 122c is formed on the rotation center side of the tooth tip portion 122b. A rotor insertion space 120a into which the rotor 160 is inserted is formed by the tooth tip surface 122c. Further, a slot 125 into which the stator winding 130 is inserted is formed by the teeth portions 122 adjacent in the circumferential direction.

The end insulating members 140 and 150 are made of resin and have end surfaces 140A and 150A on one side in the axial direction. The end insulating members 140 and 150 are disposed at positions where the end surface 140A of the end insulating member 140 faces the end surface 120A on one side of the stator core 120, and the end surface 150A of the end insulating member 150 is the stator core 120. The configuration is the same except that it is arranged at a position facing the other end face 120B. Therefore, the configuration of the end insulating member 140 will be described below.
The end insulating member 140 is provided on the inner wall (rotation center side) of the outer wall 141 and the outer wall 141 extending along the circumferential direction when viewed from the direction perpendicular to the axial direction, and extends along the circumferential direction. The inner wall 142, the outer wall 141, and the inner wall 142 are provided between the inner wall 142 and the inner wall 142. The connecting wall 143 extends in the radial direction. The outer wall portion 141, the connecting portion 143, and the inner wall portion 142 of the end insulating member 140 are disposed at positions facing the yoke portion 121, the teeth base portion 122a, and the tooth tip portion 122b of the stator core 120, respectively. An inner peripheral surface 142 a is formed on the rotation center side of the inner wall portion 142. A rotor insertion space 140a into which the rotor 160 is inserted is formed by the inner peripheral surface 142a. A winding insertion space 145 into which the stator winding 130 is inserted is formed by the connecting portions 143 adjacent in the circumferential direction. The winding insertion space 145 is disposed at a position facing the slot 125 of the stator core 120.
Similarly to the end insulating member 140, the end insulating member 150 also has an outer wall portion 151, an inner wall portion 152, a connecting portion 153, a rotor insertion space 150 a, and a winding insertion space 155.

In the present embodiment, recesses 128 are formed in the end faces 120A and 120B of the stator core 120. Further, the end surface 140A of the end insulating member 140 is formed with a protrusion 148 that can be fitted into the recess 128 formed on the end surface 120A of the stator core 120, and the end surface 150A of the end insulating member 150 is formed on the end surface 150A. A protrusion 158 that can be fitted into the recess 128 formed on the end surface 120B of the stator core 120 is formed.
Positioning means for positioning the end insulating member 140 on the stator core 120 by the protrusion 148 formed on the end surface 140A of the end insulating member 140 and the recess 128 formed on one end surface 120A of the stator core 120. The end insulating member 150 is formed into the stator core 120 by the protrusion 158 formed on the end surface 150A of the end insulating member 150 and the recess 128 formed on the other end surface 120B of the stator core 120. Positioning means for positioning is configured.

When the stator core 120 is configured by laminating electromagnetic steel plates punched by a press or the like, the boundary between the recess 128 and the end surfaces 120A and 120B becomes a sharp square shape (edge). Further, when the end insulating member 140 (150) is molded from resin, the base portion of the protrusion 148 (158) formed on the end surface 140A (150A) becomes a curved surface (R surface). In this state, when the end insulating member 140 (150) is disposed at a position facing the end surface 140A (150A) of the stator core 120, the edge of the recess 128 and the root of the protrusion 148 (158) are brought into contact with each other. As a result, a gap occurs between the end surface 120A (120B) of the stator core 120 and the end surface 140A (150A) of the end insulating member 140 (150), and the end insulating member 140 (150) is damaged. Alternatively, the end insulating member 140 (150) may fall off from the end surface 120A (120B) of the stator core 120.
In the present embodiment, depressions are formed around the protrusions 148 and 158 on the end surface 140A of the end insulating member 140 and the end surface 150A of the end insulating member 150. This prevents contact between the edge of the recess 128 and the root of the protrusion 148 (158), and the end surface 120A (120B) of the stator core 120 and the end surface 140A (150A) of the end insulating member 140 (150). It is possible to prevent a gap (rattle) between the two.

A slot insulating member 126 is inserted into the slot 125 of the stator core 120. In the present embodiment, in order to improve the insulation between the stator winding 130 and the stator core 120, the slot insulating member 126 is inserted into the slot 125 so as to protrude from the end faces 120A and 120B of the stator core 120 in the axial direction. Inserted.
Then, in a state where the end insulating members 140 and 150 are disposed on both sides in the axial direction of the stator core 120, the stator winding 130 is connected to the teeth 122 (tooth base 122a) and the end insulating members of the stator core 120. It is wound around the connecting portion 143 of 140 and the connecting portion 153 of the end insulating member 150. That is, the stator winding 130 is wound by a concentrated winding method.
In addition, an interphase insulating member 127 that insulates the stator winding 130 wound around each adjacent tooth portion 122 is inserted into the slot 125.
Note that the copper loss of the stator winding is inversely proportional to the wire diameter (cross-sectional area). For this reason, if a stator winding having a large wire diameter (cross-sectional area) is used, the copper loss of the stator winding is reduced. However, if a stator winding having a large wire diameter is used, the operation of winding the stator winding becomes difficult. Further, when a stator winding having a small wire diameter (cross-sectional area) is used, an operation of winding the stator winding becomes easy. However, if a stator winding with a small wire diameter is used, the copper loss of the stator winding increases. For this reason, in this embodiment, considering the copper loss of the stator winding and the winding workability of the stator winding, for example, a stator winding having a wire diameter of 0.6 mm to 1.4 mm is used.

Here, the conventional technique in which the corner portion of the outer peripheral surface of the connecting portion of the end insulating member has a pin angle (90-degree square shape) as viewed in a cross section along the circumferential direction will be described with reference to FIG. . 5A is a cross-sectional view of the connecting portion 243 of the conventional end insulating member along the circumferential direction, and FIG. 5B is an enlarged view of a portion V in FIG. 5A. is there.
The outer peripheral surface of the connecting portion 243 is formed by a bottom surface 243a, a top surface 243b, a first side surface 243c, and a second side surface 243d. The bottom surface 243a extends in parallel with the extending direction of the end surface 240A of the stator core 220 (the teeth base 222a), and the first side surface 243c and the second side surface 243d are perpendicular to the extending direction of the bottom surface 243a. The top surface 243b extends in a direction perpendicular to the extending direction of each of the first side surface 243b and the second side surface 243d, that is, in a direction parallel to the bottom surface 243a.
Since the connecting portions (corner portions) 244a and 244b between the top surface 243b and the first side surface 243c and the second side surface 243d are pin angles, the stator winding 230 contacts the connecting portion 244a and the connecting portion 244b. In some places, the insulating coating of the stator winding 230 may be damaged.

In addition, referring to FIG. 6, another conventional technique in which the connection portion (corner portion) of the outer peripheral surface of the coupling portion of the end insulating member is an R surface (arc surface) when viewed in a cross section along the circumferential direction. explain. 6A is a cross-sectional view of the connecting portion 343 of another conventional end insulating member along the circumferential direction, and FIG. 6B is an enlarged view of the portion VI in FIG. 6A. FIG.
The outer peripheral surface of the connecting portion 343 is formed by a bottom surface 343a, a top surface 343b, a first side surface 343c, a second side surface 343d, a first R surface 343e, and a second R surface 343f. In the connecting portion 343 shown in FIG. 6, the pin angle connecting portion (corner portion) shown in FIG. 5 is formed on the R surface (arc surface).
In the connecting portion 343 shown in FIG. 6, as in the connecting portion 243 shown in FIG. 5, the insulation coating of the stator winding 230 is damaged due to contact with the pin angle connecting portion (corner portion). Can be prevented. However, when the stator winding 330 is wound around the connecting portion 343 and the teeth base portion 322a while being pulled with a strong force, the stator winding 330 is in close contact with the first R surface 343e and the second R surface 343f, The compressive stress (solid line arrow in FIG. 6) applied to the region on the first R surface 343e and second R surface 343f side of the stator winding 330 increases, and the first R surface 343e and the second R surface 343e increase. The tensile stress (broken arrow in FIG. 6) applied to the region opposite to the surface 343f increases. For this reason, wrinkles due to compressive stress are generated in the insulating coating in the region on the first R surface 343e and second R surface 343f side of the stator winding 330, or the first winding of the stator winding 330 There is a possibility that cracks due to tensile stress occur in the insulating film in the region opposite to the R surface 343e and the second R surface 343f, and the insulating film is damaged.

Next, the connection part 143 of the edge part insulation member 140 used with the stator 110 of this embodiment is demonstrated with reference to FIGS. 7 is a cross-sectional view of the connecting portion 143 along the circumferential direction, and FIG. 8 is an enlarged view of a portion VIII in FIG. FIG. 9 is a diagram for explaining the configuration of the connecting portion 143. In addition, since the connection part 153 of the edge part insulation member 150 is the same structure as the connection part 143 of the edge part insulation member 140, description is abbreviate | omitted.
The outer peripheral surface of the connecting portion 143 is formed by a bottom surface 143a, a top surface 143b, a first side surface 143c, a second side surface 143d, a first cut surface 143e, and a second cut surface 143f. Each surface 143a-143f is formed in planar shape.
The bottom surface 143a forms part of the end surface 140A of the end insulating member 140. The bottom surface 143a extends in parallel with the extending direction of the end surface 120A (including “substantially parallel”) in a state where the end insulating member 140 is disposed at a position facing the end surface 120A on one side of the stator core 120. To do.
The first side surface 143c and the second side surface 143d extend in a direction perpendicular to the extending direction of the bottom surface 143a (including "substantially right angle").
The top surface 143b has a direction perpendicular to the extending direction of each of the first side surface 143c and the second side surface 143d (including “substantially right angle”), that is, parallel to the extending direction of the bottom surface 143a (“substantially parallel”). Including).
The first cut surface 143e has an extension direction of the first side surface 143c and an extension direction of the top surface 143b between the first side surface 143c and the top surface 143b (between the connection portion 144b and the connection portion 144a). It extends in the crossing direction.
The second cut surface 143f has an extension direction of the top surface 143b and an extension direction of the second side surface 143d between the top surface 143b and the second side surface 143d (between the connection portion 144c and the connection portion 144d). It extends in the crossing direction.
The outer peripheral surface (the top surface 143b, the first cut surface 143e, the second cut surface 143f, the first side surface 143c, and the second side surface 143d) of the connecting member 143 pulls the stator winding 130 with a strong force. However, when wound around the connecting member 143 and the teeth portion 122 (the teeth base portion 122a), a gap 149a is formed between the stator winding 130 and the first cut surface 143e, and the stator winding 130 and the second portion A gap 149b is formed between the cut surfaces 143f.

  In the present embodiment, when the stator winding 130 is wound around the connecting portion 143 and the tooth base 122a, the gaps 149a and 149b are formed between the stator winding 130 and the first cut surface 143e and the second cut surface 143f. Therefore, the compressive stress applied to the region on the first cut surface 143e and second cut surface 143f side of the stator winding 130 and the side opposite to the first cut surface 143e and second cut 143f are formed. An increase in tensile stress applied to the region can be suppressed, and damage to the insulating coating of the stator winding can be prevented.

Next, the suitable structure of the connection part 143 is demonstrated.
When the end insulating member 140 is integrally formed of resin, the connecting portions (connections shown in FIGS. 7 and 9) of each surface of the connecting portion 143 are determined depending on the manufacturing accuracy of the mold (dimensional tolerance). The portions 144a to 144d) may have a curved surface shape, for example, an arc surface shape with a radius of about 0.2 mm to 0.4 mm. Therefore, in this specification, the term “extended line” is used as a term meaning a line along a surface or a line obtained by extending a line along a surface, and an angle or a length is defined as “extended line”. It is defined using For example, the description “the connection portion between the extension line of the first surface and the extension line of the second surface” is “the connection portion between the first surface and the second surface” or “along the first surface”. This means a connecting portion between a line obtained by extending a line and a line extending from the line along the second surface.

Consider the angle formed by the extended lines of each surface of the outer peripheral surface of the connecting portion 143.
As shown in FIG. 9, the angle formed by the extension line of the first side surface 143c and the extension line of the first cut surface 143e is θ1, and the extension line of the first cut surface 143e and the top surface 143b The angle formed by the extended line is θ2, the angle formed by the extended line of the top surface 143b and the extended line of the second cut surface 143f is θ3, the extended line of the second cut surface 143f and the second side surface 143d The angle formed by the extended line is θ4. θ1 to θ4 are angles formed on the center side (opposite side of the stator winding 130) of the connecting portion 143 among the angles formed by the extending lines of the respective outer peripheral surfaces of the connecting portion 143.

When the stator winding 130 having the same wire diameter is wound around the connecting portion 143 and the teeth portion 122 (the teeth base portion 122a) while being pulled with the same force, the angles θ1 to θ4 and the thickness of the insulating coating on the stator winding 130 The relationship of (the thickness of the insulating coating after the tensile and compressive stresses are applied to the stator winding 130 by winding the stator winding 130) was determined using the model shown in FIG.
From FIG. 9, [(θ1−90 °) + (θ2−90 °) + 90 ° = 180 °] is established. That is, [θ1 + θ2 = 270 °] is established. Similarly, [(θ3-90 °) + (θ4-90 °) + 90 ° = 180 °] is established. That is, [θ3 + θ4 = 270 °] is established.
In the model shown in FIG. 10, the cut surface 143E formed between the surface 143B, the surface 143C, and the surface 143B and the surface 143C (between the connection portion 144c and the connection portion 144a) is changed between the extended line of the surface 143B and the cut surface 143E. An angle θ is formed by the extended line, an angle (270 ° −θ) is formed by the extended line of the cut surface 143E and the extended line of the surface 143C, and the length of the cut surface 143E (the extended line of the cut surface 143E and the surface 143B) The length m) between the extension wire connecting portion 144A and the cut surface 143E extension wire and the surface 143C extension wire 144B is set to three times the wire diameter D of the stator winding 130. In the state, the angle θ was changed, and the thickness of the insulating coating of the stator winding 130 was measured.

FIG. 11 shows a graph in which the relationship between the angle θ and the thickness of the insulating coating of the stator winding 130 is obtained using the model shown in FIG. In FIG. 11, the horizontal axis represents the angle θ (°), and the vertical axis represents the thickness (mm) of the insulating coating.
From the graph shown in FIG. 11, in the region where the angle θ is smaller than 130 °, the thickness of the insulating coating of the stator winding 130 increases as the angle θ increases, and the region where the angle θ is 130 ° or more. Thus, it can be understood that the thickness of the insulating coating of the stator winding 130 does not change greatly even if the angle θ is different. This is because the cut surface 143E is formed between the surface 143B and the surface 143C (between the connection portion 144B and the connection portion 144A), so that when the stator winding 130 is wound, the stator winding 130 and the surface 143C are cut. This is because a gap is formed between the surfaces 143E, and an increase in compressive stress and tensile stress applied to the stator winding 130 due to winding is suppressed.
That is, by setting the angles θ1, θ2, θ3, and θ4 to 130 ° or more (so that [130 ° ≦ θ1, θ2, θ3, θ4] is satisfied), the thickness of the insulating coating of the stator winding 130 is increased. Thickness can be prevented, and damage to the insulating film can be prevented.
As described above, [θ1 + θ2 = 270 °] and [θ3 + θ4 = 270 °] are established from FIG.
From the above, in order to prevent damage to the insulating film of the stator winding, the angles θ1, θ2, θ3, θ4 should be set within the range of 130 ° and 140 ° ([130 ° ≦ θ1, θ2, θ3 , Θ4 ≦ 140 °] is preferably set).

  Consider the length M of the first cut surface 143e and the length N of the second cut surface 143f. The length M of the first cut surface 143e is “between the connecting portions of the extended line of the first cut surface 143e and the extended lines of the first side surface 143c and the top surface 143b (the connecting portion 144b and the connecting portion). The length N of the second cut surface 143f is defined as “the connection between the extension line of the second cut surface 143f and the extension lines of the top surface 143b and the second side surface 143d”. Defined as "distance between parts".

The length M of the first cut surface 143e and the second cut surface when the stator winding having the same wire diameter is wound around the connecting portion 143 and the teeth portion 122 (the teeth base portion 122a) while being pulled with the same force. 143f length N and required insulation coating thickness (stator required to prevent damage to insulation coating of stator winding 130 due to compressive and tensile stresses applied to stator winding 130 by winding) The relationship of the thickness of the insulating coating of the winding 130 was determined using the model shown in FIG. In the model shown in FIG. 12, the angle formed by the extended line of the surface 143C and the extended line of the cut surface 143E is set to 140 °, and the angle formed by the extended line of the cut surface 143E and the extended line of the surface 143B. Is set to 130 °, the length of the cut surface 143E (the connecting portion 144A between the extended line of the cut surface 143E and the extended line of the surface 143B, the extended line of the cut surface 143E and the extended line of the surface 143C, The required thickness of the insulating coating was measured by changing the length m between the connecting portions 144B.
FIG. 13 shows a graph in which the relationship between the length m of the cut surface 143E and the necessary thickness of the insulating coating is obtained using the model shown in FIG. In FIG. 13, the horizontal axis represents the length m of the cut surface 143 </ b> E expressed by the magnification of the wire diameter D (mm) of the stator winding 130, and the vertical axis represents the insulating coating of the stator winding 130. The thickness (mm) of the insulating coating of the stator winding 130 necessary for preventing the damage is shown.

From the graph shown in FIG. 13, in the region where the length m of the cut surface 143E is smaller than twice the wire diameter D of the stator winding 130, the required thickness of the insulation coating increases as the length m increases. Can be understood to be thinner. This is because when the length m of the cut surface 143E is short, the stator winding 130 comes into close contact with the cut surface 143E, and the compressive stress and the cut surface applied to the region of the stator winding 130 on the cut surface 143E side. This is because the tensile stress applied to the region opposite to 143E increases. On the other hand, in the region where the length m of the cut surface 143E is twice or more the wire diameter D of the stator winding 130, it can be understood that even if the length m is different, the required thickness of the insulating coating does not change greatly. This is because when the length m of the cut surface 143E is increased, a gap is formed between the stator winding 130 and the cut surface 143E, and the compressive stress and cut applied to the region of the stator winding 130 on the cut surface 143E side. This is because an increase in tensile stress applied to the region opposite to the surface 143E is suppressed.
That is, in order to reduce the thickness of the insulating coating of the stator winding 130 while preventing damage to the stator winding 130, the length M of the first cut surface 143e and the length of the second cut surface 143f are used. The length N is preferably set to be not less than twice the wire diameter D of the stator winding 130 (so that [D × 2 ≦ M, N] is satisfied).

Consider the length H of the top surface 143b. The length H of the top surface 143b is “between the connecting portions of the extending line of the top surface 143b and the extending lines of the first cut surface 143e and the second cut surface 143f (between the connecting portion 144a and the connecting portion 144c. ) Length ".
When the width along the circumferential direction of the teeth base portion 122a of the teeth portion 122 is W (see FIG. 7), the length H of the top surface 143b is [H = W−M × sin (θ2−90 °) −N ×. sin (θ3-90 °)].

The length H of the top surface 143b and the required thickness of the insulation coating when the stator winding having the same wire diameter is wound around the connecting portion 143 and the teeth portion 122 (the teeth base portion 122a) while being pulled with the same force. The relationship was determined using the model shown in FIG. In the model shown in FIG. 14, the angle formed by the extended line of the cut surface 143E on one side and the extended line of the surface 143B is set to 130 °, and is formed by the extended line of the surface 143B and the cut surface 143F on the other side. In a state where the angle to be set is 130 °, the length of the surface 143B (the length between the connection portion 144A and the connection portion 144C) h is changed to change the required thickness of the insulating coating (the stator by winding) The thickness of the insulating coating of the stator winding 130 required to prevent damage to the insulating coating of the stator winding 130 due to the compressive stress and tensile stress applied to the winding 130 was measured.
FIG. 15 shows a graph in which the relationship between the length h of the surface 143B and the necessary thickness of the insulating coating is obtained using the model shown in FIG. In FIG. 15, the horizontal axis indicates the length h of the surface 143B expressed by the magnification of the wire diameter D (mm) of the stator winding 130, and the vertical axis prevents damage to the stator winding 130. The thickness (mm) of the insulating coating of the stator winding 130 necessary for the purpose is shown.

From the graph shown in FIG. 15, in the region where the length h of the surface 143B is smaller than twice the wire diameter D of the stator winding 130, the required thickness of the insulating coating increases as the length h increases. I can understand that it gets thinner. This is because when the length h of the surface 143B is short, the curvature of the bending portion of the stator winding 130 between the connecting portion 144A and the connecting portion 144C is reduced (rapidly bent). This is because the compressive stress applied to the region on the surface 143B side and the tensile stress applied to the region opposite to the surface 143B are increased. On the other hand, in the region where the length h of the surface 143B is twice or more the wire diameter D of the stator winding 130, it can be understood that even if the length h is different, the required thickness of the insulating coating does not change greatly. This is because when the length h of the surface 143B increases, the curvature of the bending portion of the stator winding 130 between the connection portion 144A and the connection portion 144C increases (bently bends), and the stator winding 130 This is because an increase in compressive stress applied to the region on the surface 143B side and an increase in tensile stress applied to the region on the side opposite to the surface 14BE are suppressed.
That is, in order to reduce the thickness of the insulating coating of the stator winding 130 while preventing damage to the stator winding 130, the length H of the top surface 143b is set to 2 of the wire diameter D of the stator winding 130. It is preferable to set it at least twice (so that [D × 2 ≦ H] is satisfied).

  The length M of the first cut surface 143e is within a range in which the length N of the second cut surface 143f and the length H of the top surface 143b are at least twice the wire diameter D of the stator winding 130. Limited to The length N of the second cut surface 143f is within a range in which the length M of the first cut surface 143e and the length H of the top surface 143b are at least twice the wire diameter D of the stator winding 130. Limited to The length H of the top surface 143b is within a range in which the length M of the first cut surface 143e and the length N of the second cut surface 143f are at least twice the wire diameter D of the stator winding 130. Limited to

The present invention is not limited to the configuration described in the embodiment, and various changes, additions, and deletions are possible.
The shape of the outer peripheral surface of the connecting portion of the end insulating member is not limited to the configuration described in the embodiment. For example, the first and second side surfaces are preferably formed so as to extend in a direction perpendicular to the extending direction of the bottom surface, but extend in a direction intersecting with the extending direction of the bottom surface. It may be formed. The extending direction of the top surface is preferably formed so as to extend in a direction orthogonal to the first and second side surfaces, but may be formed in a direction intersecting with the first and second side surfaces. Good. Preferably, one cut surface is formed between the top surface and the first side surface and between the top surface and the second side surface, but a plurality of cut surfaces may be formed.
The electric motor of the present invention is not limited to a permanent magnet electric motor, and can be configured as various types of electric motors including a rotor and a stator.
The electric motor of the present invention can be used as an electric motor for driving various devices other than the compression mechanism section of the compressor.

10 Compressor 20 Case (sealed container)
21 Discharge pipe 22 Suction pipe 30 Compression mechanism part 31 Cylinder 32 Eccentric rotor 33 Lubricating oil retainer 40 Accumulator 41 Suction pipe 100 Motor 110 Stator 120 Stator core 120A, 120B End face 120a Rotor insertion space 121 Yoke part 122 Teeth part 122a, 222a, 322a Teeth base portion 122b Teeth tip portion 122c Teeth tip surface 125 Slot 126 Slot insulation member 127 Interphase insulation member 128 Recess 130, 230, 330 Stator winding 140, 150 End insulation member 140A, 150A End face 40a, 50a Rotor Insertion space 141, 151 Outer wall portion 142, 152 Inner wall portion 142a, 152a Inner peripheral surface 143, 153, 243, 343 Connecting portion 143a, 243a, 343a Bottom surface 143b, 243b, 343b Top surface 143c, 143d, 243c, 243d, 343c, 343d Side surfaces 143e, 143f Cut surfaces 144a to 144d, 244a, 244b, 344a to 344d Connection portion 145, 155 Winding insertion space 148, 158 Protrusion portion 149a, 149b Clearance 343e, 343f R surface

Claims (3)

A stator and a rotor arranged to be rotatable relative to the stator;
The stator includes a stator core having end faces on both sides in the axial direction, an end insulating member disposed at a position facing the end face of the stator core, and a stator winding.
The stator core includes a yoke portion extending along a circumferential direction when viewed from a direction perpendicular to the axial direction, and a teeth portion extending along the radial direction from the yoke portion, and the end insulating portion The member has an outer wall portion and an inner wall portion extending in the circumferential direction when viewed from a direction perpendicular to the axial direction, and a connecting portion extending in the radial direction between the outer wall portion and the inner wall portion. The stator winding is an electric motor wound around the coupling portion of the end insulating member and the teeth portion of the stator core,
The outer peripheral surface of the connecting portion of the end insulating member has a bottom surface, a first side surface, a second side surface, a top surface, and a first cut formed in a planar shape when viewed in a cross section along the circumferential direction. A bottom surface extending along the end surface of the stator core, and the first side surface and the second side surface intersect with an extending direction of the bottom surface. The top surface extends in a direction intersecting the extending direction of the first side surface and the extending direction of the second side surface, and the first cut surface is 1 is formed between one side surface and the top surface, and extends in a direction intersecting with the extending direction of the first side surface and the extending direction of the top surface, and the second cut surface is the top surface And extending in a direction crossing the extending direction of the top surface and the extending direction of the second side surface,
As the stator winding, a stator winding having a wire diameter D in the range of 0.6 mm and 1.4 mm is used.
An angle θ1 formed by the extension line of the first side surface and the extension line of the first cut surface, an angle θ2 formed by the extension line of the first cut surface and the extension line of the top surface, the top The angle θ3 formed by the extended line of the surface and the extended line of the second cut surface, and the angle θ4 formed by the extended line of the second cut surface and the extended line of the second side surface are 130 °. Set within the range of 140 °,
A length H between connection points of the extended line of the top surface, the extended line of the first cut surface, and the extended line of the second cut surface, the extended line of the first cut surface, and the first Length M between connection points of the extended line of the side surface and the extended line of the top surface, and the connection point of the extended line of the second cut surface and the extended line of the second side surface and the extended line of the top surface The length N between them is set to be twice or more the wire diameter D of the stator winding . The electric motor according to claim 1 ,
The first side surface and the second side surface extend in a direction perpendicular to the extending direction of the bottom surface, and the top surface extends in the extending direction of the first side surface and the extending side of the second side surface. An electric motor characterized by extending in a direction perpendicular to the current direction. A compressor comprising a compression mechanism section and an electric motor that drives the compression mechanism section, wherein the electric motor according to claim 1 or 2 is used as the electric motor.

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