WO2019065140A1

WO2019065140A1 - Stator, motor, and compressor

Info

Publication number: WO2019065140A1
Application number: PCT/JP2018/033002
Authority: WO
Inventors: 英明内勢; 貴之右田; 真郷青野; 彰太川島
Original assignee: 日本電産株式会社
Priority date: 2017-09-29
Filing date: 2018-09-06
Publication date: 2019-04-04
Also published as: CN211720362U

Abstract

This stator according to one embodiment comprises: a stator core having an annular core back centered on a center axis extending in the vertical direction, and a plurality of teeth extending from the core back in the radial direction; a plurality of coils provided on the teeth; and a coil support which is annular and is positioned on the upper side of the stator core. The plurality of coils each have an inner lead-out line which is led out from inside in the radial direction of the coil support to the upper side, and an outer lead-out line which is led out from outside in the radial direction of the coil support to the upper side. The coil support has an annular main body centered on the center axis. A plurality of grooves are provided on the outer surface of the main body facing outside in the radial direction, the grooves extending along the vertical direction and opening in the vertical direction. The inner lead-out lines are lead along the grooves and out to the upper side of the coil support, and are connected to outer lead-out lines extending from other coils.

Description

Stator, motor and compressor

The present invention relates to a stator, a motor and a compressor.

BACKGROUND Conventionally, as a motor used for a compressor or the like, there is a motor in which an end of a coil wire is fixed to a coil support and movement of the end of the coil wire due to vibration is suppressed. Patent Document 1 discloses a structure in which U-phase, V-phase and W-phase stator windings (coil wires) bundled as a neutral point are fixed to a housing member.

JP, 2012-170166, A

In the conventional structure, in order to connect and fix the ends of a coil wire, the coil wire needed to be drawn complicatedly. For this reason, in the conventional structure, the winding of the end of the coil wire is performed manually, and there is a problem that it is difficult to improve the productivity of the stator.

An object of the present invention is to provide a stator, a motor, and a method of manufacturing the stator, which can enhance productivity by facilitating the routing of a lead wire drawn from a coil in view of the above-mentioned circumstances.

The stator according to a preferred embodiment of the present invention is provided with a stator core having an annular core back portion centered on a vertically extending central axis and a plurality of teeth portions radially extending from the core back portion; And an annular coil support located on the upper side of the stator core. Each of the plurality of coils has an inner lead wire drawn from the radially inner side to the upper side of the coil support and an outer lead wire drawn from the radial outer side to the upper side of the coil support. The coil support has an annular main body centered on the central axis. A plurality of groove portions extending in the vertical direction and opening in the vertical direction are provided on an inner side surface facing inward in the radial direction of the main body portion. The inner lead is drawn to the upper side of the coil support through the groove and is connected to the outer lead extending from the other coil.

A motor according to a preferred embodiment of the present invention has a rotor which is opposed to the above-mentioned stator with a gap in the radial direction and which rotates around the central axis.

The compressor in a preferred embodiment of the present invention has the stator described above.

According to a preferred embodiment of the present invention, it is possible to provide a stator, a motor and a method of manufacturing the stator capable of enhancing the productivity by facilitating the routing of a lead wire drawn from a coil.

FIG. 1 is a cross-sectional view of a motor of a preferred embodiment. FIG. 2 is a perspective view of a stator of a preferred embodiment. FIG. 3 is a perspective view of a stator piece of a preferred embodiment. FIG. 4 is a schematic view showing a layout configuration of inner and outer lead wires extending from a coil in the stator of a preferred embodiment. FIG. 5 is a partial cross-sectional view of a coil support of a preferred embodiment. FIG. 6 is a plan view showing the procedure of the routing process of the outer lead wire according to a preferred embodiment. FIG. 7 is a perspective view of a coil support of a preferred variation. FIG. 8 is a schematic view of a compressor of a preferred embodiment.

Hereinafter, a motor according to an embodiment of the present invention will be described with reference to the drawings. In the following drawings, in order to make each configuration easy to understand, the scale, the number, and the like in an actual structure and each structure may be different.

In each figure, an XYZ coordinate system is shown as appropriate. In the present specification, the Z-axis direction is a vertical direction with the positive side at the upper side and the negative side at the lower side. A central axis J appropriately shown in each drawing is an imaginary line which is parallel to the Z-axis direction and extends in the vertical direction. In the following description, the axial direction of the central axis J, that is, the direction parallel to the vertical direction is simply referred to as “axial direction”, and the radial direction centering on the central axis J is simply referred to as “radial direction”. The circumferential direction centered on is simply referred to as "circumferential direction". In each figure, the circumferential direction is appropriately indicated by an arrow θ.

In the present specification, the positive side in the Z-axis direction in the axial direction is referred to as “upper side”, and the negative side in the Z-axis direction in the axial direction is referred to as “lower side”. Note that the vertical direction, the upper side, and the lower side are directions used merely for the purpose of explanation, and do not limit the actual positional relationship when using the motor or the attitude of the motor.

In the present specification, the side advancing in the counterclockwise direction as viewed from the upper side to the lower side, that is, the side advancing in the direction of the arrow θ is referred to as “circumferential one side”. The side advancing clockwise as viewed from the upper side to the lower side in the circumferential direction, that is, the side advancing in the direction opposite to the direction of the arrow θ is referred to as “the other side in the circumferential direction”.

<Motor>

FIG. 1 is a cross-sectional view of a motor 1 of the present embodiment. The motor 1 of the present embodiment is a three-phase alternating current motor. The motor 1 of the present embodiment is an inner rotor type motor.

The motor 1 includes a rotor 2, a stator 3, a bearing holder 4, a housing 5, and a pair of bearings 6. The rotor 2 rotates relative to the stator 3 about a central axis J extending along the vertical direction.

The housing 5 is in the form of a tube having a bottom. The housing 5 accommodates the rotor 2, the stator 3, the bearing holder 4 and the pair of bearings 6 therein.

The bearing holder 4 is located above the stator 3. The bearing holder 4 is supported on the inner peripheral surface of the housing 5.

The pair of bearings 6 are axially spaced from each other. The pair of bearings 6 support the shaft 2 a of the rotor 2. One of the bearings 6 of the pair of bearings 6 is supported by the bearing holder 4. The other bearing 6 of the pair of bearings 6 is supported by the housing 5. Only one bearing 6 may be disposed on the motor 1 to support the shaft 2a.

<Rotor>

The rotor 2 can rotate around the central axis J. The rotor 2 is opposed to the stator 3 with a gap in the radial direction. The rotor 2 includes a shaft 2a having a central axis J, a rotor core 2b, and a plurality of magnets 2c. In the present embodiment, the number of magnets 2c is ten.

The shaft 2a extends along the central axis J. In the example of the present embodiment, the shaft 2a has a cylindrical shape extending in the axial direction. The shaft 2 a is rotatably supported around the central axis J by a plurality of bearings 6. The shaft 2a is not limited to the above cylindrical shape, but may be, for example, a cylindrical shape.

The rotor core 2b is a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the axial direction. The rotor core 2b is provided with a central hole 2h penetrating in the axial direction. The central hole 2 h is located at the center of the rotor core 2 b as viewed in the axial direction. The shaft 2a is passed through the central hole 2h. The shaft 2a is fixed directly or indirectly to the rotor core 2b.

The plurality of magnets 2c are fixed to the outer peripheral surface of the rotor core 2b. The magnet 2 c radially faces the tooth portion 12 of the stator 3. The plurality of magnets 2c includes a magnet 2c whose radially outer side is an N pole and a magnet 2c whose radially outer side is an S pole. The magnet 2c whose radially outer side is an N pole and the magnet 2c whose radially outer side is an S pole are alternately arranged in the circumferential direction. In place of the plurality of magnets 2c, an annular magnet may be used in which N and S poles are alternately magnetized in the circumferential direction.

The rotor 2 of this embodiment is a SPM (Surface Permanent Magnet) type rotor in which the magnets 2 c are disposed on the outer peripheral surface of the rotor core 2 b. However, the rotor 2 may be an IPM (Interior Permanent Magnet) type rotor in which a magnet is embedded inside the rotor core. Also, the rotor core 2b and the magnet 2c may be housed inside a cylindrical rotor cover.

<Stator>

FIG. 2 is a perspective view of the stator 3. The stator 3 has a substantially annular shape centering on the central axis J. The stator 3 has a plurality of stator pieces 3A annularly arranged along the circumferential direction, and a coil support 40 positioned above the plurality of stator pieces 3A.

FIG. 3 is a perspective view of one stator piece 3A. In the stator 3, stator pieces 3A adjacent in the circumferential direction are connected. That is, a portion of the stator 3 excluding the coil support 40 is configured by connecting a plurality of stator pieces 3A along the circumferential direction.

The stator 3 of the present embodiment has fifteen stator pieces 3A. The stator piece 3A has a core piece 10A, an insulator 20, and a coil 50. That is, in the present embodiment, the stator 3 has 15 core pieces 10A, 15 insulators 20, and 15 coils 50. The coil 50 is composed of a coil wire 51.

The core piece 10A is a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the axial direction. Thus, the core piece 10A extends in the axial direction with a uniform cross section. The fifteen core pieces 10A are arranged side by side around the central axis J. The fifteen core pieces 10A are connected to one another in the circumferential direction to constitute a stator core 10. That is, the stator 3 has a stator core 10.

The stator core 10 surrounds the rotor 2 at the radially outer side of the rotor 2. The stator core 10 has a core back portion 11, a plurality of teeth portions 12, and a plurality of umbrella portions 13.

As shown in FIG. 2, the core back portion 11 has a substantially annular shape centering on the central axis J. The outer peripheral surface of the core back portion 11 is fixed to the inner peripheral surface of the housing 5.

As shown in FIG. 3, the teeth 12 extend radially inward from the core back portion 11. The teeth 12 extend in the radial direction with a substantially uniform cross section. In stator core 10, the plurality of teeth 12 are arranged at equal intervals along the circumferential direction. An insulator 20 is attached to the teeth portion 12. The coil wire 51 is wound around the teeth portion 12 via the insulator 20. Therefore, the coil wire 51 is positioned between the pair of teeth 12 adjacent in the circumferential direction. In addition, the core back part 11 and the teeth part 12 may be formed separately, may be comprised as one member, and may be formed as a single member.

The umbrella portion 13 is located at the radially inner end of the tooth portion 12. The umbrella portion 13 is wider in the circumferential direction than the teeth portion 12. That is, the dimension along the circumferential direction of the umbrella portion 13 is larger than the dimension along the circumferential direction of the teeth portion 12. The surface of the umbrella portion 13 facing inward in the radial direction has an arc shape centering on the central axis J when viewed from the axial direction. The radially inner surface of the umbrella portion 13 radially faces the magnet 2 c of the rotor 2. In addition, the dimension along the circumferential direction of the umbrella part 13 may be the same as the dimension along the circumferential direction of the teeth part 12, and may be small. The teeth portion 12 may not have the umbrella portion 13. The surface of the umbrella portion 13 facing inward in the radial direction may have not only an arc shape centered on the central axis J but also another shape such as a linear shape as viewed from the axial direction.

The stator 3 of the present embodiment has a plurality of teeth portions 12. In the present embodiment, the number of teeth 12 is fifteen. As described above, the rotor 2 of the present embodiment has ten magnets 2c. Therefore, the motor 1 of the present embodiment is a motor configured of 10 poles and 15 slots. The number of poles and the number of slots of the motor are not limited to those in the present embodiment, and are appropriately selected depending on the output and the like.

The insulator 20 is made of an insulating material (for example, an insulating resin). One insulator 20 is attached to one tooth portion 12. That is, the insulator 20 is attached to the stator core 10. The fifteen insulators 20 are arranged at equal intervals along the circumferential direction. The fifteen insulators 20 are attached to the stator core 10.

The insulator 20 has an upper piece 20A and a lower piece 20B. The upper piece 20A is attached to the core piece 10A from the upper side. The lower piece 20B is attached to the core piece 10A from the lower side. The upper piece 20A surrounds the upper end surface of the core back portion 11 and the upper region of both circumferential end surfaces of the teeth portion 12. Further, the lower piece 20B surrounds the lower end surface of the core back portion 11 and the lower regions of both end surfaces of the tooth portion 12 in the circumferential direction. In the present embodiment, the upper piece 20A and the lower piece 20B have the same shape. However, the upper piece 20A and the lower piece 20B may have different shapes.

The insulator 20 has a base 21, an inner wall 23 and an outer wall 24.

The base portion 21 surrounds the entire outer peripheral surface of the tooth portion 12. The base 21 is interposed between the outer peripheral surface of the teeth 12 and the coil 50. In addition, as long as the base part 21 can ensure insulation with the teeth part 12 and the coil wire 51, a part of outer peripheral surface of the teeth part 12 may be exposed.

The inner wall portion 23 overlaps the umbrella portion 13 as viewed in the axial direction. The inner wall portion 23 extends along the circumferential direction and the axial direction (vertical direction). The inner wall portion 23 is located radially inward of the coil 50. The inner wall portion 23 is provided in each of the upper piece 20A and the lower piece 20B. The inner wall portion 23 of the upper piece 20 </ b> A is located immediately above the umbrella portion 13 and contacts the upper end surface of the umbrella portion 13. The inner wall portion 23 of the lower piece 20B is located immediately below the umbrella portion 13 and contacts the lower end surface of the umbrella portion 13. The inner wall portion 23 restricts the radial inward movement of the coil wire 51 wound around the teeth portion 12. The inner wall portion 23 has an arc shape curved along the circumferential direction as viewed from the axial direction. As shown in FIG. 2, the inner wall portions 23 of the fifteen insulators 20 are connected to each other in the circumferential direction to form a cylindrical wall portion centered on the central axis J.

As shown in FIG. 3, the inner wall portion 23 is provided with an inner wall notch 23 a extending downward from the upper end edge. The inner wall notch 23a penetrates in the radial direction. Further, the inner wall notch 23a opens upward. In the manufacturing process of the stator 3, the inner lead wire 55 extending from the coil 50 is drawn out to the inner wall notch 23 a. In the present embodiment, the inner lead 55 passes through the inner wall notch 23a provided in the upper piece 20A.

According to the present embodiment, the inner lead wire 55 is drawn from the coil 50 at a position overlapping the inner wall notch 23a in the circumferential direction. Therefore, in the manufacturing process of the stator 3, the inner lead wire 55 can be linearly extended radially inward by passing the inner lead wire 55 through the inner wall notch 23 a from the end of winding or the beginning of winding of the coil 50. Thereby, in the manufacturing process of the stator 3, it can suppress that the inner lead wire 55 inhibits the assembly | attachment of another member. More specifically, in the steps of arranging and connecting the stator pieces 3A in an annular shape and arranging the coil support 40 on the upper side of the annularly arranged stator core 10, the inner lead wire 55 does not disturb the operation. , Can improve work efficiency.

The outer wall portion 24 overlaps the core back portion 11 as viewed in the axial direction. The outer wall portion 24 extends along the circumferential direction and the axial direction (vertical direction). The outer wall portion 24 is located radially outward of the coil 50. The outer wall portion 24 is provided to each of the upper piece 20A and the lower piece 20B. The outer wall portion 24 of the upper piece 20A is located immediately above the core back portion 11 and contacts the upper end surface of the core back portion 11. The outer wall portion 24 of the lower piece 20B is located immediately below the core back portion 11 and contacts the lower end surface of the core back portion 11. The outer wall portion 24 extends along the circumferential direction. The outer wall portion 24 radially faces the inner wall portion 23. The outer wall portion 24 restricts the movement of the coil wire 51 wound around the teeth portion 12 outward in the radial direction. The outer wall portion 24 has an arc shape curved along the circumferential direction as viewed from the axial direction. As shown in FIG. 2, the outer wall portions 24 of the fifteen insulators 20 are connected to each other in the circumferential direction to form a cylindrical wall portion centered on the central axis J.

As shown in FIG. 3, the outer wall portion 24 is provided with a pair of outer wall cutouts 24 a extending downward from the upper end edge. The outer wall notch 24a penetrates in the radial direction. Also, the outer wall notch 24a opens upward. The pair of outer wall cutouts 24 a are arranged along the circumferential direction. An outer lead wire 56 extending from the coil 50 is drawn out of one of the pair of outer wall notches 24a. That is, the outer lead wire 56 is drawn radially outward from the coil 50 through the outer wall notch 24a. The upper end edge of the outer wall portion 24 faces the coil support 40 in the axial direction (vertical direction). According to the present embodiment, since the outer lead wire 56 passes through the outer wall notch 24a, the outer lead wire 56 can be passed radially outward of the coil support 40. In the present embodiment, the outer lead wire 56 passes through the outer wall notch 24a provided in the upper piece 20A.

The coil 50 is provided to the teeth portion 12. More specifically, the coil 50 is configured by winding the coil wire 51 around the teeth portion 12. In the present embodiment, one coil wire 51 is wound around one tooth portion 12. The coil 50 has an inner lead 55 and an outer lead 56. In the present embodiment, the inner lead wire 55 corresponds to the winding start of the coil wire 51, and the outer lead wire 56 corresponds to the winding end of the coil wire 51. That is, the inner lead wire 55 and the outer lead wire 56 are both end portions of the coil wire 51. The inner lead wire 55 is drawn from the radially inner side of the coil 50. The outer lead wire 56 is drawn from the radially outer side of the coil 50. As shown in FIG. 1, the inner lead wire 55 is drawn from the radially inner side to the upper side of the coil support 40. Similarly, the outer lead wire 56 is drawn from the radially outer side to the upper side of the coil support 40.

FIG. 4 is a schematic view showing a wiring configuration of the inner leader 55 and the outer leader 56 extending from the coil 50 in the stator 3 of the present embodiment.

In the present embodiment, the motor 1 is a three-phase motor having a U-phase, a V-phase and a W-phase. The plurality of coils 50 are classified into a plurality of first phase coils, a plurality of second phase coils, and a plurality of third phase coils that constitute any one of U phase, V phase, and W phase. More specifically, the fifteen coils 50 include five U-phase coils (first phase coils) 50 U, five V-phase coils (second phase coils) 50 V, and five W-phase coils Third phase coil) 50 W. U-phase coil 50U, V-phase coil 50V, and W-phase coil 50W are repeatedly arranged in this order in the circumferential direction. The number of phases of the motor 1 is not limited to three, and may be two or four or more.

The plurality of coils 50 of the same phase are connected in series with one another. That is, five U-phase coils 50U are connected in series, five V-phase coils 50V are connected in series, and five W-phase coils 50W are connected in series. The outer lead wire 56 of the coil 50 is connected to the inner lead wire 55 of another coil 50 of the same phase.

The outer lead wire 56 of the coil 50 is drawn to one side in the circumferential direction with respect to the drawn coil 50. The outer lead wire 56 is connected with the inner lead wire 55 extending from the coil 50 of the same phase beyond the two coils 50 of the two other phases in the circumferential direction. For example, the outer lead wire 56 of the U-phase coil 50U is drawn to one side in the circumferential direction, and exceeds the V-phase coil 50V and the W-phase coil 50W in the circumferential direction. Wired with The inner lead wire 55 and the outer lead wire 56 are connected to each other at the connection portion 59.

Three outer lead wires 56 at the end of U-phase coil 50 U, V-phase coil 50 V and W-phase coil 50 W connected in series are drawn to the lower side of stator 3. As shown in FIG. 1, it is drawn downward from the stator 3. The three outer lead wires 56 drawn downward are connected to the control device of the motor 1. The control device applies an alternating current to the U-phase coil 50U, the V-phase coil 50V, and the W-phase coil 50W.

The three inner lead wires 55 at the end of the U-phase coil 50U, the V-phase coil 50V, and the W-phase coil 50W connected in series are mutually connected to form a neutral point. The neutral points are connected to each other at the neutral point connection 59N. Thereby, the plurality of coils 50 are connected to one another by Y connection.

As shown in FIG. 2, the wire connection portion 59 is formed, for example, by welding by resistance welding in a state in which the inner lead wire 55 and the outer lead wire 56 are bundled by the conductive gripping member 59 a. Similarly, the neutral point connection portion 59N is formed by welding by resistance welding in a state in which the three inner lead wires 55 are bundled by the conductive gripping member 59a. The stator 3 of the present embodiment is provided with twelve connection portions 59 and one neutral point connection portion 59N. The inner leader 55 and the outer leader 56 may be formed by a method other than welding. When welding the inner leader 55 and the outer leader 56, welding etc. is performed while holding the inner leader 55 and the outer leader 56 at a predetermined position with a jig or the like without using the holding member 59a. May be

<Coil support>

As shown in FIG. 2, the coil support 40 is annular around the central axis J. The coil support 40 has a rotationally symmetrical shape every 24 ° obtained by equally dividing one turn into 15 parts around the central axis J. The coil support 40 is located above the stator core 10. The coil support 40 overlaps all the coils 50 as viewed in the axial direction. The coil support 40 is made of, for example, a resin material. The coil support 40 according to the present embodiment includes a main body 41, a plurality of guides 45, and a flange 49.

The main body portion 41 has an annular shape centered on the central axis J. The main body portion 41 has an inner side surface 41 a facing inward in the radial direction, an outer side surface 41 b facing outward in the radial direction, and an upper surface 41 c facing upward.

A plurality of grooves 43 extending in the axial direction (vertical direction) is provided on the inner side surface 41 a of the main body 41. In the present embodiment, the groove portions 43 are provided in the main body portion 41 by the same number as the number of the coils 50. In the present embodiment, the number of grooves 43 is fifteen. The plurality of grooves 43 are arranged at equal intervals in the circumferential direction. The groove 43 opens vertically. The inner lead wire 55 of the coil 50 is passed through the groove 43. That is, the inner lead 55 is drawn to the upper side of the coil support 40 through the groove 43. Furthermore, the inner lead 55 is connected to the outer lead 56 extending from the other coil 50.

According to the present embodiment, the inner lead 55 is drawn through the groove 43 to the upper side of the coil support 40. Therefore, it can be suppressed that the inner lead wire 55 protrudes radially inward with respect to the inner side surface 41 a of the coil support 40. Inside the radial direction of the stator 3, the rotor 2 which rotates around the central axis J is arrange | positioned. For this reason, the stator 3 needs to provide a sufficient clearance in the radial direction with respect to the rotor 2. According to the present embodiment, since the inner lead wire 55 passes inside the inner side surface 41 a of the coil support 40, the coil support 40 is enlarged in the radial direction while suppressing the interference between the stator 3 and the rotor 2. It can be suppressed.

According to the present embodiment, by locating the inner leader 55 inside the groove 43 of the coil support 40, the inner leader 55 can be held on the inner circumferential surface of the groove 43. Thus, the arrangement of the inner lead wire 55 can be stabilized, and the connection process between the inner lead wire 55 and the outer lead wire 56 in the assembly process can be stably performed. In addition, since the plurality of inner lead wires 55 are located inside the different groove portions 43, it is possible to enhance the reliability of the insulation between the plurality of inner lead wires 55. The three inner lead wires 55 connected by the neutral point connection portion 59N are located inside one groove portion 43.

According to the present embodiment, the groove 43 opens radially inward on the inner side surface 41 a of the main body 41. Therefore, the inner lead wire 55 can be easily inserted into the groove 43 by raising the radially inner lead wire 55 upward in the assembly process of the stator 3. For this reason, according to the present embodiment, the routing process of the inner lead wire 55 can be simplified.

The groove 43 is connected to the inner wall notch 23 a provided in the inner wall 23 of the insulator 20 at the lower opening. That is, the circumferential position of the inner wall notch 23 a overlaps the circumferential position of the groove 43. Therefore, the inner lead wire 55 is raised by raising the inner lead wire 55 drawn inward in the radial direction from the inner wall notch 23a in the winding step of the coil 50 in the wiring step of the inner lead wire 55. Can be inserted smoothly into the As a result, not only the manufacturing process of the stator 3 can be simplified, but also the manufacturing process of the stator 3 can be automated.

A flange 49 is provided on the inner side surface 41 a of the main body 41. The flange portion 49 is located at the lower end of the inner side surface 41 a and protrudes radially inward from the inner side surface 41 a. The flange portion 49 is divided into a plurality (the number of groove portions) by the groove portion 43. In the present embodiment, the flange portion 49 is divided into 15 pieces by the groove portion 43. In the present specification, one flange portion 49 is described as being divided into fifteen pieces. The flange portion 49 is substantially annular as viewed in the axial direction.

The flange 49 is in contact with the upper end edge of the inner wall 23 of the insulator 20. The flange portion 49 is welded to the upper end edge of the inner wall portion 23. Thereby, the coil support 40 is fixed to the plurality of insulators 20. The flange 49 may be fixed to the inner wall 23 by a method other than welding.

As shown in FIG. 1, the outer side surface 41 b of the main body portion 41 is a conical surface that inclines to the central axis J as it goes upward. A plurality of guiding portions 45 are provided on the outer side surface 41 b. In the present embodiment, the guide portions 45 are provided in the main body portion 41 by the same number as the number of the coils 50. In the present embodiment, the number of guiding portions 45 is fifteen.

As shown in FIG. 2, each of the plurality of guide portions 45 is a rib that protrudes radially outward from the outer side surface 41 b of the main body portion 41 and extends in a spiral shape along a conical surface. That is, the guide part 45 is a rib which inclines toward an upper side as it goes to the circumferential direction one side. Moreover, the guide part 45 is a rib which inclines radially inward along the outer side surface 41b as it goes to the circumferential direction one side. One guide 45 extends across the three coils 50 in the circumferential direction.

The plurality of guiding portions 45 are arranged at equal intervals along the circumferential direction. A pair of guide portions 45 adjacent to each other in the circumferential direction oppose each other in the axial direction (vertical direction). An outer lead wire 56 is drawn between a pair of guide portions 45 adjacent to each other in the circumferential direction. Thereby, the plurality of guiding portions 45 respectively guide the plurality of outer leader lines 56.

The outer lead wire 56 is guided by the guide portion 45 and routed in the circumferential direction and upward along the outer side surface 41 b. Further, the outer lead wire 56 is drawn to the upper side of the coil support 40 and is connected to the inner lead wire 55 extending from the other coil 50.

According to the present embodiment, the outer lead wire 56 is guided by the guide portion 45 and drawn around the upper surface of the coil support 40 in a conical spiral along the outer surface 41 b. For this reason, in the manufacturing process of the stator 3, the arrangement of the outer lead wire 56 can be easily performed. More specifically, in the manufacturing process of the stator 3, the outer lead wire 56 is wound around the outer surface 41 b of the coil support 40 by rotating the stator 3 in a state where the outer lead wire 56 is pulled out and gripped radially outward. It is possible to As a result, not only the manufacturing process of the stator 3 can be simplified, but also the manufacturing process of the stator 3 can be automated.

According to the present embodiment, the outer side surface 41 b of the main body 41 is a conical surface. For this reason, the routing path of the outer lead wire 56 is helical along the conical surface. More specifically, the outer lead wire 56 extends upward and radially inward toward one circumferential side. Outer lead wires 56 drawn from a pair of coils 50 adjacent to each other in the circumferential direction extend in the circumferential direction in parallel at the top and bottom. According to the present embodiment, since the outer lead wire 56 spirally extends along the conical surface, one of the upper sides of the pair of outer lead wires 56 parallel to the upper and lower sides is radially inward with respect to the other lower side. To position. Thereby, the dimension of the direction of an axis of coil support 40 can be controlled, securing the distance of a pair of outside leader line 56 parallel to the upper and lower sides. As a result, the axial dimension of the stator 3 can be reduced.

According to the present embodiment, the outer lead wire 56 extends radially inward toward one circumferential side. Since the outer lead wire 56 is connected to the inner lead wire 55 passing through the radially inner side of the coil support 40, the connection with the inner lead wire 55 is facilitated by bringing the tip of the outer lead wire 56 closer to the radial inner side. be able to.

According to the present embodiment, the guide portion 45 is located between the pair of outer lead wires 56 extending from the coils 50 adjacent to each other in the circumferential direction. For this reason, the guide portion 45 can enhance the reliability of the insulation between the pair of outer lead wires 56 extending in the circumferential direction in parallel with each other in the vertical direction. In addition, since the outer lead wire 56 is sandwiched between the pair of guide portions 45 in the axial direction (vertical direction), the holding of the outer lead wire 56 by the coil support 40 can be stabilized.

The upper surface 41 c of the main body portion 41 is provided with a plurality of recessed portions 42 recessed downward. In the present embodiment, the concave portion 42 is provided in the main body portion 41 by the same number (15) as the number of the coils 50. The plurality of recesses 42 are arranged at equal intervals in the circumferential direction. One concave portion 42 is located between a pair of groove portions 43 adjacent to each other in the circumferential direction.

In the recess 42, the connection portion 59 or the neutral point connection portion 59N between the inner lead wire 55 and the outer lead wire 56 is accommodated. The concave portion 42 is filled with the filling resin portion 9 in which the wire connection portion 59 or the neutral point wire connection portion 59N is embedded.

The filled resin portion 9 is an insulating resin material. In the present embodiment, the filling resin portion 9 is a so-called potting material. The filled resin portion 9 may be an adhesive. The filled resin portion 9 is filled in the recess 42 and cured in an uncured state. Thereby, the filling resin portion 9 is fixed to the inner peripheral surface of the recess 42. In addition, the filling resin portion 9 fixes the wire connection portion 59 or the neutral point wire connection portion 59 </ b> N inside the recess 42. The filled resin portion 9 may be, for example, an anaerobic resin, a resin that is cured by ultraviolet light, or a resin that is mixed with a liquid of two or more resins and cured, and is not particularly limited.

As described above, the stator 3 is provided with twelve connection portions 59 and one neutral point connection portion 59N. In addition, the coil support 40 is provided with fifteen recesses 42. The connection portions 59 are accommodated in the recess 42 one by one. The neutral point connection portion 59N is accommodated in the recess 42 in which the connection portion 59 is not accommodated. For this reason, neither the wire connection portion 59 nor the neutral point wire connection portion 59N is accommodated in the two concave portions 42 among the fifteen concave portions 42. Further, the filling resin portion 9 is not filled in the recess 42 in which the wire connection portion 59 and the neutral point wire connection portion 59N are not accommodated.

According to this embodiment, the wire connection portion 59 or the neutral point wire connection portion 59N is surrounded by the filling resin portion 9. Thereby, the reliability of the insulation of the connection part 59 and the neutral point connection part 59N can be improved. Further, according to the present embodiment, the wire connection portion 59 or the neutral point wire connection portion 59N is disposed inside the recess 42 and fixed by the filling resin portion 9. As a result, even when vibration is applied to the motor 1, interference of the connection portion 59 and the neutral point connection portion 59N with other portions can be suppressed.

According to the present embodiment, one connection portion 59 is accommodated in one recess 42. That is, the plurality of wire connection parts 59 are accommodated in different recessed parts 42 respectively. Therefore, the contact between the connection portions 59 can be reliably suppressed, and the short circuit of the coil wires 51 of different phases can be effectively suppressed.

FIG. 5 is a partial cross-sectional view of the coil support 40 of the present embodiment.

The main body 41 has a wall 44 that divides the groove 43 and the recess 42. The wall 44 constitutes the inner wall of the groove 43 and constitutes the inner wall of the recess 42. The inner lead wire 55 is drawn upward through the groove 43 and is bent toward the recess 42 starting from the upper end edge 44 a of the wall 44. Thus, the wire connection portion 59 located at the tip of the inner lead wire 55 is accommodated in the recess 42.

According to the present embodiment, it is possible to suppress the inner lead wire 55 from protruding above the coil support 40 by bending the inner lead wire 55 starting from the upper end edge 44 a of the wall portion 44. Further, since the wall portion 44 divides the groove portion 43 and the recess portion 42, the tip of the inner lead wire 55 can be accommodated in the recess portion 42 by one bending process extending upward from the groove portion 43. The process can be simplified.

In the present embodiment, the upper end 44 a of the wall 44 is a curved surface that curves along the thickness direction. Therefore, when the inner lead wire 55 is bent along the upper end edge 44 a of the wall portion 44, the inner lead wire 55 can be bent smoothly.

<Manufacturing method>

Next, a method of manufacturing the stator 3 will be described.

The manufacturing process of the stator 3 mainly includes a winding process, a connection process, a coil support assembling process, a wiring process, a connection process, and a filling process. A winding process, a connection process, a coil support assembling process, a wiring process, a connection process and a filling process are performed in this order. Hereinafter, each process of a manufacturing method of stator 3 is explained in detail.

(Winding process)

The winding step is a step of forming the stator piece 3A shown in FIG.

In the winding process, first, the core pieces 10A are formed by laminating the electromagnetic steel plates in the axial direction and fixing them to each other.

Then, the insulator 20 is attached to the core piece 10A. Next, the coil wire 51 is wound around the teeth portion 12 of the core piece 10A via the insulator 20 to form a coil 50. At this time, the inner lead wire 55 corresponding to the winding start of the coil wire 51 is drawn radially inward from the radially inner end of the coil 50 through the inner wall notch 23a. Further, the outer lead wire 56 corresponding to the winding end of the coil wire 51 is drawn radially outward from the radially outer end of the coil 50 through the outer wall notch 24a.

In the winding step, the stator piece 3A is formed through the above steps. In the winding process of this embodiment, fifteen stator pieces 3A are formed. The coil wire 51 is not wound around the tooth portion 12 to constitute the coil 50, but the coil wire 51 is wound beforehand to constitute the coil 50, and then the coil 50 is attached to the tooth portion 12 It is also good.

(Connection process)

In the coupling step, fifteen stator pieces 3A are arranged in a ring around central axis J. That is, the 15 core pieces 10A are arranged in a ring around the central axis J. Furthermore, a pair of core pieces 10A adjacent in the circumferential direction are connected to each other at the end face facing the circumferential direction of the core back portion 11.

In the coupling step, the stator core 10 having fifteen core pieces 10A is formed through the above steps.

(Coil support assembly process)

In the coil support assembling process, as shown in FIG. 2, first, the coil support 40 is disposed on the upper side of the stator core 10 formed in the connecting process. Furthermore, the flange portion 49 of the coil support 40 is welded to the insulator 20, and the coil support 40 is fixed to the stator core 10 via the insulator 20.

(Planning process)

The routing step is a step of routing the inner leader 55 and the outer leader 56. The routing process includes a routing process of the inner leader 55 and a routing process of the outer leader 56. Either of the routing step of the inner lead wire 55 and the routing step of the outer lead wire 56 may be performed in advance. Here, the case where the routing process of the inner lead wire 55 is performed in advance will be described.

[Routing process of the inner leader]

The inner lead wire 55 in the state before performing the wiring process extends radially inward from the coil 50 through the inner wall notch 23 a of the insulator 20. Note that among the fifteen inner lead wires 55, the three inner lead wires 55 are connected to one another in the subsequent connection step to form a neutral point. For this reason, unlike the other twelve inner lead wires 55, the three inner lead wires 55 extend radially inward through one inner wall notch 23a.

In the process of arranging the inner lead 55, the tip of the inner lead 55 is grasped to draw the inner lead upward. As a result, the plurality of inner leads 55 drawn radially inward are drawn around the coil support 40 through the grooves 43. Since the inner wall notch 23 a is connected to the groove 43 of the coil support 40, the inner lead 55 can be smoothly inserted into the groove 43 by extending the inner lead 55 upward.

[Outline leader routing process]

The outer lead wire 56 in the state before performing the wiring process extends radially outward from the coil 50 through the outer wall notch 24 a of the insulator 20. Of the fifteen outer lead wires 56, the three outer lead wires 56 are drawn to the lower side of the stator 3 without passing through the outer wall notch 24a. The three outer lead wires 56 drawn downward are connected to a control device (not shown) that controls the motor 1. In the following description, when simply referred to as the outer lead wire 56, the twelve outer lead wires 56 excluding the three outer lead wires 56 drawn downward are meant.

FIG. 6 is a plan view showing the procedure of the routing process of the outer lead wire 56. As shown in FIG. In addition, illustration of the inner lead wire 55 is abbreviate | omitted in FIG.

In the present embodiment, the routing process of the outer lead wire 56 is performed using an assembly jig. The assembly jig has a holding portion (not shown) for holding the stator core 10 and a plurality of gripping portions 91. In the present embodiment, the number of gripping portions 91 is twelve.

In the step of arranging the outer lead wire 56, first, the stator core 10 is fixed to the holding portion of the jig, and the tip 56a of the outer lead wire 56 is gripped by the holding portion 91 of the jig. That is, the tips 56 a of the plurality of outer lead wires 56 drawn outward in the radial direction are held. Thus, the outer lead wires 56 are each extended linearly from the coil 50 in the radial direction without slack.

Next, without rotating the grip portion 91, the stator core 10 and the coil support 40 are rotated to the other side in the circumferential direction by the holding portion of the jig. That is, the stator core 10 and the coil support 40 are rotated relative to the tip 56 a of the outer lead wire 56 around the central axis J. As the coil support 40 rotates, the outer lead wire 56 is wound around the outer surface 41 b of the coil support 40. Thereby, the outer lead wire 56 is drawn around the upper side of the coil support 40 in a conical spiral shape along the outer side surface 41 b of the coil support 40.

As shown by a two-dot chain line in FIG. 6, the gripping portion 91 preferably moves inward in the radial direction as the coil support 40 rotates. Further, in order to smoothly arrange the outer lead wire 56 in a conical spiral shape, it is preferable to move the grip portion 91 upward with the rotation of the coil support 40. However, the upward movement of the grip portion 91 accompanying the rotation of the coil support 40 is not essential. The outer surface 41b is provided with a guiding portion 45 for guiding the outer lead wire 56 in a conical spiral shape, so that even if the grip portion 91 is not moved upward, the routing path of the outer lead wire 56 is a conical spiral shape. Can be

In the present embodiment, the case where the stator core 10 and the coil support 40 are rotated and the tip 56 a of the outer lead wire 56 is not rotated has been described. However, these only need to be relatively rotated. For example, with the stator core 10 and the coil support 40 fixed, the tips 56a of the plurality of outer lead wires 56 may be rotated circumferentially around the central axis J to one side.

(Connection process)

The wire connection step is a step of mutually connecting the inner lead wire 55 and the outer lead wire 56 drawn to the upper side of the coil support 40 to form a wire connection portion 59.

As shown in FIG. 2, a conductive gripping member 59 a is attached to the wire connection portion 59. In the wire connection step, first, on the upper side of the coil support 40, the inner lead wire 55 and the outer lead wire 56 are gripped and simply fixed by the gripping members 59a. Furthermore, the inner lead wire 55 and the outer lead wire 56 are gripped via the gripping members 59a, and these are welded by resistance welding. Thereby, in the wire connection process, the inner lead wire 55 and the outer lead wire 56 are wired on the upper side of the coil support 40. The inner lead wire 55 and the outer lead wire 56 may be connected by a method other than welding. When connecting the inner lead wire 55 and the outer lead wire 56, even if the inner lead wire 55 and the outer lead wire 56 are connected by welding or the like using a jig or the like without the holding member 59a. Good.

Further, in the connection step, the three inner lead wires 55 constituting the neutral point connection portion 59N are connected to each other. The connection process of the three inner lead wires 55 is performed by the same procedure as the procedure of connecting the inner lead wire 55 and the outer lead wire 56.

(Filling process)

The filling process is performed after the connection process.

In the filling step, first, the connection portion 59 and the neutral point connection portion 59N between the inner lead wire 55 and the outer lead wire 56 are accommodated in different concave portions 42, respectively. Then, the uncured filled resin portion 9 is filled in the plurality of concave portions 42 in which the wire connection portion 59 and the neutral point wire connection portion 59N are accommodated. As a result, the wire connection portion 59 and the neutral point wire connection portion 59N are embedded in the uncured filled resin portion 9. Furthermore, the filling resin portion 9 is cured in a state in which the wire connection portion 59 and the neutral point wire connection portion 59N are embedded.

<Modification of coil support>

FIG. 7 is a perspective view of a coil support 140 of a modification that can be adopted in the above-described embodiment. About the component of an aspect same as the above-mentioned embodiment, the same numerals are attached and the explanation is omitted.

The coil support 140 according to the present modification includes the main body 41, the plurality of guides 145, and the flange 49, as in the above-described embodiment. Moreover, the outer side surface 41b of the main-body part 41 is a conical surface which inclines in the central axis J as it goes to an upper side similarly to the above-mentioned embodiment.

The guide portion 145 of this variation has a support surface 146 facing upward. The support surface 146 extends in a conical spiral along the outer surface 41 b of the main body 41. The support surface 146 of this modification is a step surface facing upward and extending in a conical spiral shape. The support surface 146 guides the lower side of the outer lead wire 56. That is, the guide portion 145 guides the outer lead wire 56 of the coil 50.

The support surface 146 has a first region 146a, and a second region 146b connected to one side in the circumferential direction from the first region 146a and extending above the first region 146a. That is, the first region 146a and the second region 146b are connected in this order toward one side in the circumferential direction. In addition, the second region 146b extends above the first region 146a.

The guide portion 145 has a rib 147 in the first region 146a. For this reason, the guide portion 145 has a rib lower surface 146c that faces downward on the lower side of the first region 146a. On the other hand, the guide part 145 does not have a rib in the second region 146b. For this reason, the first area 146a is formed wider in the radial direction than the second area 146b by the radial dimension of the rib 147.

Here, attention is focused on a pair of guide portions 145 arranged adjacent to each other in the circumferential direction. Of the pair of guide portions 145 arranged adjacent to each other in the circumferential direction, one located on the other side in the circumferential direction is referred to as a first guide portion 145A, and the other located on one side in the circumferential direction is a second guide portion It is called 145B. The first guiding portion 145A and the second guiding portion 145B are arranged in this order toward one side in the circumferential direction.

The first regions 146a of the first guiding portion 145A and the first regions 146a of the second guiding portion 145B are arranged at mutually different positions as viewed from the axial direction. The second region 146b of the first guiding portion 145A is located above and radially inward of the first region 146a of the second guiding portion 145B. For this reason, in the present modification, the support surfaces 146 of the first guiding portion 145A and the second guiding portion 145B do not overlap with each other as viewed from the axial direction. According to this modification, the guide part 145 of the coil support 140 can be easily manufactured by the metal mold | die which makes an axial direction a drawing direction. As a result, it is possible to reduce the cost of the mold and manufacture the coil support 140 inexpensively.

The relationship between the first guide portion 145A and the second guide portion 145B described above is the same in all the guide portions 145 arranged adjacent to each other in the circumferential direction.

According to this modification, the outer lead wire 56 passes under the rib 147 of the guiding portion 145. Therefore, the guide part 145 of this modification can guide the outside leader line 56 not only on the support surface 146 facing upward but also on the rib lower surface 146c. According to this modification, the holding of the outer lead wire 56 by the coil support 140 can be stabilized.

(Compressor)

FIG. 8 is a schematic view of a compressor 100 provided with the motor 1 of the present embodiment. The compressor 100 of the present embodiment includes a motor 1, a compression mechanism unit 101 located below the motor 1, a case 109, and an accumulator 108.

The compression mechanism portion 101 has an eccentric rotor 103 and a cylinder 102 surrounding the eccentric rotor 103. The eccentric rotor 103 is connected to the shaft 2 a of the motor 1 and rotates with the driving of the motor 1.

The case 109 accommodates the motor 1 and the compression mechanism unit 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 to make the operation of the compression mechanism unit 101 smooth.

In the accumulator 108, the refrigerant (cooling gas) and the lubricating oil are stored in a separated state. The refrigerant separated in the accumulator 108 is supplied to the compression mechanism section 101 inside the case 109 via the suction pipe 104.

The compressor 100 rotates the eccentric rotor 103 of the compression mechanism unit 101 with the drive of the motor 1. Thereby, the compressor 100 sucks the refrigerant from the suction pipe 104 into the cylinder 102 and compresses it in the compression mechanism section 101. The compressed refrigerant passes through the periphery and the inside of the motor 1 and is discharged from a discharge pipe 105 provided at the top of the case 109.

In the above-mentioned embodiment and its modification, the outer side surface 41b of the main body 41 may not necessarily be a conical surface as long as it is a surface which inclines inward in the radial direction toward the upper side. Similarly, in the above-described embodiment and its variations, the outer leader line 56 extends along a conical spiral. However, the routing path of the outer lead wire 56 may be a conical spiral even if it is not a strictly conical spiral. That is, the outer lead wire 56 may pass through a wiring route extending upward and radially inward toward one circumferential side. In the present specification, conical spiral means a spiral along a conical surface.

Although the embodiment of the present invention and the modification thereof have been described above, each configuration and combination thereof in the embodiment and the modification are only an example, and addition of the configuration without departing from the spirit of the present invention Omissions, substitutions and other changes are possible. Further, the present invention is not limited by the embodiments.

DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Rotor, 3 ... Stator piece, 9 ... Filling resin part, 10 ... Stator core, 10A ... Core piece, 11 ... Core back part, 12 ... Teeth part, 20 ... Insulator, 21 ... Base, 23: inner wall, 23a: inner wall notch, 24: outer wall, 24a: outer wall notch, 40, 140: coil support, 41: main body, 41a: inner surface, 41b: outer surface, 41c, upper surface, 42: Recesses, 43: Grooves, 44: Walls, 44a: Upper edge, 45, 145: Guides, 50: Coils, 50 U: U-phase coil (first phase coil), 50 V: V-phase coil (second phase coil) , 50 W: W phase coil (third phase coil), 51: coil wire, 55: inner lead wire, 56: outer lead wire, 56a: tip, 59: connection portion, 100: compressor, 146: support surface, 146a ... second Regions, 146b ... second region, J ... central axis

Claims

A stator core having an annular core back portion centered on a vertically extending central axis and a plurality of teeth portions radially extending from the core back portion;

A plurality of coils provided in the teeth portion;

An annular coil support located on the upper side of the stator core;

Equipped with

The plurality of coils may

An inner lead wire drawn from the radially inner side to the upper side of the coil support;

An outer lead wire drawn from the radially outer side to the upper side of the coil support;

The coil support has an annular main body centering on the central axis, and a plurality of grooves extending in the vertical direction are provided on the inner side facing the radial direction inner side of the main body, extending in the vertical direction. ,

The inner lead is drawn to the upper side of the coil support through the groove and is connected to the outer lead extending from the other coil.

Stator.
And an insulator attached to the stator core,

The insulator is

A base surrounding the outer peripheral surface of the teeth portion;

An inner wall portion located radially inward of the coil and extending along a circumferential direction and a vertical direction;

An outer wall portion located radially outward of the coil and extending along a circumferential direction and a vertical direction;

The inner wall portion is provided with an inner wall notch portion extending downward from the upper end edge,

The inner lead wire is drawn from the coil at a position overlapping the inner wall notch in the circumferential direction.

The stator according to claim 1.
The stator according to claim 2, wherein a circumferential position of the inner wall notch overlaps a circumferential position of the groove.
The outer wall portion is provided with an outer wall notch extending downward from the upper end edge,

The outer leader line is drawn radially outward from the coil through the outer wall notch.

The stator according to claim 2 or 3.
The coil support has a plurality of guiding portions provided on an outer side surface facing the radially outer side of the main body portion and guiding a plurality of the outer lead wires, respectively.

The outer lead is drawn along the outer surface to the upper side of the coil support and is connected to the inner lead extending from the other coil.

The stator according to any one of claims 1 to 4.
The upper surface of the main body portion facing upward is provided with a plurality of recessed portions which are recessed downward.

The recess is located between a pair of grooves adjacent to each other in the circumferential direction,

A connection portion between the inner lead wire and the outer lead wire is accommodated in the recess,

The concave portion is filled with a filling resin portion in which the wire connection portion is embedded.

The stator according to any one of claims 1 to 5.
The stator according to claim 6, wherein the inner leader line is bent toward the recess, starting from an upper end edge of a wall that divides the groove and the recess.
The stator according to claim 7, wherein an upper end edge of a wall that divides the groove and the recess is a curved surface that curves along a thickness direction.
The stator according to any one of claims 1 to 8;

And a rotor which is opposed to the stator with a gap in the radial direction and which rotates about the central axis.

motor.
A compressor comprising the motor according to claim 9.