WO2021181593A1

WO2021181593A1 - Stator, electric motor, compressor, air conditioner, and method for manufacturing stator

Info

Publication number: WO2021181593A1
Application number: PCT/JP2020/010708
Authority: WO
Inventors: 松岡　篤
Original assignee: 三菱電機株式会社
Priority date: 2020-03-12
Filing date: 2020-03-12
Publication date: 2021-09-16
Also published as: JP7278474B2; JPWO2021181593A1

Abstract

A stator (3) has a stator core (31) and three-phase coils (32) attached to the stator core (31) in a distributed winding manner. The three-phase coils (32) have 6×n U-phase coils (32U), 6×n V-phase coils (32V), and 6×n W-phase coils (32W) at coil ends (32a). Each of the 6×n U-phase coils (32U), 6×n V-phase coils (32V), and 6×n W-phase coils (32W) includes 2×n sets of coil groups each including first to third coils. The first coil is disposed on the stator core (31) at two slot pitches, the second coil is disposed on the stator core (31) at two slot pitches, and the third coil is disposed on the stator core (31) at one slot pitch.

Description

Manufacturing method for stators, motors, compressors, air conditioners, and stators

This disclosure relates to a stator for motors.

Generally, a stator having a three-phase coil is known (for example, Patent Document 1). The stator core disclosed in Patent Document 1 has 24 slots, the three-phase coil forms eight magnetic poles, and the number of slots for one magnetic pole is three. In this stator, the coils of each phase are arranged every three slots, and are attached to the stator core by lap winding, and two coils of the same phase are arranged in each slot. In this case, the stator has an advantage that 100% of the magnetic flux emitted from the rotor toward the stator can be used.

Jitsukaisho 53-114012

However, an electric motor that uses 100% of the magnetic flux emitted from the rotor toward the stator is affected by the harmonic components contained in the magnetic flux from the rotor, so the induced voltage containing many harmonics is applied to each phase. It occurs in the coil. As a result, the torque ripple in the motor increases.

The purpose of this disclosure is to suppress the increase in torque ripple in the motor.

The stator according to one aspect of the present disclosure is
Stator iron core and
It is equipped with a three-phase coil attached to the stator core by distributed winding.
The stator core has 18 × n slots (n is an integer of 1 or more).
Each of the 18 × n slots is provided in an inner layer in which one of the three-phase coils is arranged and outside the inner layer in the radial direction, and one coil of the three-phase coils is provided. Including the outer layer on which
The three-phase coil has 6 × n U-phase coils, 6 × n V-phase coils, and 6 × n W-phase coils at the coil ends of the three-phase coils, and has 10 × n U-phase coils. Form a magnetic pole,
Each of the 6 × n U-phase coils, the 6 × n V-phase coils, and the 6 × n W-phase coils is a 2 × n set in which the first to third coils are a set. Including the coil group of
At the coil end, the first to third coils are arranged in this order in the circumferential direction.
A part of the first coil is arranged in the first slot of the 18 × n slots together with a part of the second coil.
At the coil end, the third coil is adjacent to the second coil with one of the 18 × n slots in between.
The first coil is arranged on the stator core at a 2-slot pitch.
The second coil is arranged on the stator core at a 2-slot pitch.
The third coil is arranged on the stator core at a pitch of one slot.
The stator according to another aspect of the present disclosure is
Stator iron core and
It is equipped with a three-phase coil attached to the stator core by distributed winding.
The stator core has 18 × n slots (n is an integer of 1 or more).
Each of the 18 × n slots is provided in an inner layer in which one of the three-phase coils is arranged and outside the inner layer in the radial direction, and one coil of the three-phase coils is provided. Including the outer layer on which
The three-phase coil has 6 × n U-phase coils, 6 × n V-phase coils, and 6 × n W-phase coils at the coil ends of the three-phase coils, and has 10 × n U-phase coils. Form a magnetic pole,
Each of the 6 × n U-phase coils, the 6 × n V-phase coils, and the 6 × n W-phase coils is a 2 × n set in which the first to third coils are a set. Including the coil group of
At the coil end, the first to third coils are arranged in this order in the circumferential direction.
A part of the second coil is a second of the 18 × n slots adjacent to the first slot of the 18 × n slots in which a part of the first coil is arranged. Located in 2 slots,
At the coil end, the third coil is adjacent to the second coil with one of the 18 × n slots in between.
The first coil is arranged on the stator core at a pitch of one slot.
The second coil is arranged on the stator core at a pitch of one slot.
The third coil is arranged on the stator core at a 2-slot pitch.
The motor according to another aspect of the present disclosure is
With the stator
It includes a rotor arranged inside the stator.
The compressor according to another aspect of the present disclosure is
With a closed container
With the compression device arranged in the closed container,
It includes the electric motor that drives the compression device.
The air conditioner according to another aspect of the present disclosure is
With the compressor
Equipped with a heat exchanger.
The method for manufacturing a stator according to another aspect of the present disclosure
A method for manufacturing a stator having a stator core having 18 × n slots (n is an integer of 1 or more) and a three-phase coil attached to the stator core.
Each of the 18 × n slots is provided in an inner layer in which one of the three-phase coils is arranged and outside the inner layer in the radial direction, and one coil of the three-phase coils is provided. Including the outer layer on which
The three-phase coil has 6 × n U-phase coils, 6 × n V-phase coils, and 6 × n W-phase coils at the coil ends of the three-phase coils, and has 10 × n U-phase coils. Form a magnetic pole,
Each of the 6 × n U-phase coils, the 6 × n V-phase coils, and the 6 × n W-phase coils is a 2 × n set in which the first to third coils are a set. Including the coil group of
The first coil is arranged in a distributed winding around the stator core at a 2-slot pitch, and
The second coil is arranged in a distributed winding around the stator core at a pitch of 2 slots.
The third coil is arranged in a distributed winding around the stator core at a pitch of one slot.
The method for manufacturing a stator according to another aspect of the present disclosure
A method for manufacturing a stator having a stator core having 18 × n slots (n is an integer of 1 or more) and a three-phase coil attached to the stator core.
Each of the 18 × n slots is provided in an inner layer in which one of the three-phase coils is arranged and outside the inner layer in the radial direction, and one coil of the three-phase coils is provided. Including the outer layer on which
The three-phase coil has 6 × n U-phase coils, 6 × n V-phase coils, and 6 × n W-phase coils at the coil ends of the three-phase coils, and has 10 × n U-phase coils. Form a magnetic pole,
Each of the 6 × n U-phase coils, the 6 × n V-phase coils, and the 6 × n W-phase coils is a 2 × n set in which the first to third coils are a set. Including the coil group of
The first coil is arranged in a distributed winding around the stator core at a pitch of one slot.
The second coil is arranged in a distributed winding around the stator core at a pitch of one slot.
The third coil is arranged in a distributed winding around the stator core at a pitch of 2 slots.

According to the present disclosure, it is possible to suppress an increase in torque ripple in the motor.

It is a top view which shows schematic structure of the electric motor which concerns on Embodiment 1. FIG. It is sectional drawing which shows schematic structure of a rotor. It is a top view which shows the structure of a stator schematically. It is a figure which shows typically the arrangement of the three-phase coil at a coil end, and the arrangement of a three-phase coil in a slot. It is a figure which shows schematic structure of a stator seen from the center of a stator. It is a figure which shows schematic structure of a stator seen from the outside of a stator. It is a flowchart which shows an example of the manufacturing process of a stator. It is a figure which shows the example of the insertion instrument for inserting a three-phase coil into a stator core. It is a figure which shows the insertion process of the 1st coil in step S11. It is a figure which shows the insertion process of the 2nd coil in step S12. It is a figure which shows the insertion process of the 3rd coil in step S14. It is a top view which shows the electric motor which concerns on a comparative example. It is a figure which shows the comparison with the winding coefficient of the stator in the comparative example. It is a top view which shows schematic structure of the electric motor which concerns on Embodiment 2. FIG. It is a top view which shows schematic structure of the stator in Embodiment 2. FIG. It is a figure which shows typically the arrangement of the three-phase coil in a coil end and a slot. It is a figure which shows schematic structure of the stator seen from the center of the stator shown in FIG. It is a figure which shows schematic structure of the stator seen from the outside of the stator shown in FIG. It is a flowchart which shows an example of the manufacturing process of a stator. It is a figure which shows the insertion process of the 2nd coil in step S21. It is a figure which shows the insertion process of the 3rd coil in step S23. It is a figure which shows the insertion process of the 1st coil in step S25. It is a top view which shows schematic structure of the electric motor which concerns on Embodiment 3. FIG. It is a top view which shows schematic structure of the stator in Embodiment 3. FIG. It is a figure which shows typically the arrangement of the three-phase coil in a coil end and a slot. It is a figure which shows schematic structure of the stator seen from the center of the stator shown in FIG. 23. It is a figure which shows schematic structure of the stator seen from the outside of the stator shown in FIG. 23. It is a schematic diagram which shows the example of the delta connection of the three-phase coil in Embodiment 3. It is a figure which shows the example of the three-phase coil connected by the delta connection in Embodiment 3. FIG. It is a flowchart which shows an example of the manufacturing process of a stator. It is a figure which shows the insertion process of the 3rd coil in step S31. It is a figure which shows the insertion process of the 2nd coil in step S33. It is a figure which shows the insertion process of the 1st coil in step S34. It is a figure which shows another example of the stator core in Embodiment 3. FIG. It is a figure which shows schematic manufacturing process of the stator core shown in FIG. 34. It is a figure which shows schematic manufacturing process of the stator core shown in FIG. 34. It is a figure which shows schematic manufacturing process of the stator core shown in FIG. 34. It is a top view which shows schematic structure of the electric motor which concerns on Embodiment 4. FIG. It is a top view which shows schematic structure of the stator in Embodiment 4. FIG. It is a figure which shows typically the arrangement of the three-phase coil at a coil end, and the arrangement of a three-phase coil in a slot. It is a figure which shows schematic structure of the stator seen from the center of the stator shown in FIG. 39. It is a figure which shows schematic the structure of the stator 3 seen from the outside of the stator 3 shown in FIG. 39. It is a schematic diagram which shows the example of the delta connection of the three-phase coil in Embodiment 4. It is a figure which shows the example of the three-phase coil connected by the delta connection in Embodiment 4. It is a flowchart which shows an example of the manufacturing process of a stator. It is a figure which shows the insertion process of the 2nd coil in step S41. It is a figure which shows the insertion process of the 1st coil in step S43. It is a figure which shows the insertion process of the 3rd coil in step S45. It is a figure which shows the comparison with the winding coefficient of the stator in the comparative example. It is a top view which shows schematic structure of the electric motor which concerns on Embodiment 5. It is a top view which shows schematic structure of the stator in Embodiment 5. It is a figure which shows typically the arrangement of the three-phase coil in a coil end and a slot. It is a figure which shows schematic structure of the stator seen from the center of the stator shown in FIG. 51. It is a figure which shows schematic structure of the stator seen from the outside of the stator shown in FIG. 51. It is a flowchart which shows an example of the manufacturing process of a stator 3. It is a figure which shows the insertion process of the 2nd coil in step S51. It is a figure which shows the insertion process of the 3rd coil in step S53. It is a figure which shows the insertion process of the 1st coil in step S55. It is a figure which shows another example of the stator core in Embodiment 5. It is a figure which shows schematic manufacturing process of the stator core shown in FIG. 59. It is a figure which shows schematic manufacturing process of the stator core shown in FIG. 59. It is a figure which shows schematic manufacturing process of the stator core shown in FIG. 59. It is a top view which shows schematic structure of the electric motor which concerns on Embodiment 6. It is a top view which shows schematic structure of the stator in Embodiment 6. It is a figure which shows typically the arrangement of the three-phase coil in a coil end and a slot. It is a figure which shows schematic structure of the stator seen from the center of the stator shown in FIG. 64. It is a figure which shows schematic structure of the stator seen from the outside of the stator shown in FIG. 64. It is a flowchart which shows an example of the manufacturing process of a stator. It is a figure which shows the insertion process of the 3rd coil in step S61. It is a figure which shows the insertion process of the 2nd coil in step S63. It is a figure which shows the insertion process of the 1st coil in step S65. It is sectional drawing which shows schematic structure of the compressor which concerns on Embodiment 7. FIG. It is a figure which shows schematic the structure of the refrigerating air-conditioning apparatus which concerns on Embodiment 8.

Embodiment 1.
In the xyz Cartesian coordinate system shown in each figure, the z-axis direction (z-axis) indicates a direction parallel to the axis Ax of the electric motor 1, and the x-axis direction (x-axis) is orthogonal to the z-axis direction (z-axis). The y-axis direction (y-axis) indicates a direction orthogonal to both the z-axis direction and the x-axis direction. The axis Ax is the center of the stator 3 and the center of rotation of the rotor 2. The direction parallel to the axis Ax is also referred to as "axial direction of rotor 2" or simply "axial direction". The radial direction is the radial direction of the rotor 2 or the stator 3 and is a direction orthogonal to the axis Ax. The xy plane is a plane orthogonal to the axial direction. The arrow D1 indicates the circumferential direction centered on the axis Ax. The circumferential direction of the rotor 2 or the stator 3 is also simply referred to as the "circumferential direction".

<Motor 1>
FIG. 1 is a top view schematically showing the structure of the motor 1 according to the first embodiment.

The motor 1 has a rotor 2 having a plurality of magnetic poles, a stator 3, and a shaft 4 fixed to the rotor 2. The electric motor 1 is, for example, a permanent magnet synchronous motor.

The rotor 2 is rotatably arranged inside the stator 3. There is an air gap between the rotor 2 and the stator 3. The rotor 2 rotates about the axis Ax.

FIG. 2 is a cross-sectional view schematically showing the structure of the rotor 2.
The rotor 2 has a rotor core 21 and a plurality of permanent magnets 22.

The rotor core 21 has a plurality of magnet insertion holes 211 and a shaft hole 212 in which the shaft 4 is arranged. The rotor core 21 may further have at least one flux barrier portion that is a space communicating with each magnet insertion hole 211.

In the present embodiment, the rotor 2 has a plurality of permanent magnets 22. Each permanent magnet 22 is arranged in each magnet insertion hole 211.

One permanent magnet 22 forms one magnetic pole of the rotor 2, that is, N pole or S pole. However, two or more permanent magnets 22 may form one magnetic pole of the rotor 2.

In the present embodiment, one permanent magnet 22 forming one magnetic pole of the rotor 2 is arranged straight in the xy plane. However, in the xy plane, a set of permanent magnets 22 forming one magnetic pole of the rotor 2 may be arranged so as to have a V shape.

The center of each magnetic pole of the rotor 2 is located at the center of each magnetic pole of the rotor 2 (that is, the north pole or the south pole of the rotor 2). Each magnetic pole of the rotor 2 (also simply referred to as "each magnetic pole" or "magnetic pole") means a region serving as an north pole or an south pole of the rotor 2.

<Stator 3>
FIG. 3 is a top view schematically showing the structure of the stator 3.
FIG. 4 is a diagram schematically showing the arrangement of the three-phase coil 32 at the coil end 32a and the arrangement of the three-phase coil 32 in the slot 311. In FIG. 4, the dashed line indicates the coil of each phase at the coil end 32a, and the chain line indicates the boundary between the inner layer and the outer layer in each slot 311.
As shown in FIG. 3, the stator 3 has a stator core 31 and a three-phase coil 32 attached to the stator core 31 in a distributed winding manner.

The stator core 31 has an annular yoke, a plurality of teeth extending radially from the yoke, and 18 × n (n is an integer of 1 or more) slots 311 in which the three-phase coils 32 are arranged. .. Each slot is also referred to as, for example, a first slot, a second slot, ..., Nth slot. As shown in FIG. 4, each of the 18 × n slots 311 is provided outside the inner layer in which one of the three-phase coils 32 is arranged and the inner layer in the radial direction, and is a three-phase coil. Includes an outer layer on which one of the 32 coils is located. That is, in the example shown in FIG. 4, the space in each slot 311 is divided into an inner layer and an outer layer. In this embodiment, n = 1. Therefore, in the example shown in FIGS. 3 and 4, the stator core 31 has 18 slots 311.

FIG. 5 is a diagram schematically showing the structure of the stator 3 as seen from the center of the stator 3.
FIG. 6 is a diagram schematically showing the structure of the stator 3 as seen from the outside of the stator 3.
The three-phase coil 32 (ie, the coil of each phase) has a coil side arranged in slot 311 and a coil end 32a not arranged in slot 311. Each coil end 32a is an end portion of the three-phase coil 32 in the axial direction.

The three-phase coil 32 has 6 × n U-phase coils 32U, 6 × n V-phase coils 32V, and 6 × n W-phase coils 32W at each coil end 32a (FIG. 1). That is, the three-phase coil 32 has three phases, a first phase, a second phase, and a third phase. For example, the first phase is the U phase, the second phase is the V phase, and the third phase is the W phase. In this embodiment, each of the three phases is referred to as a U phase, a V phase, and a W phase. Each U-phase coil 32U, each V-phase coil 32V, and each W-phase coil 32W shown in FIG. 1 are also simply referred to as coils.

In this embodiment, n = 1. Therefore, in the example shown in FIG. 1, at the coil end 32a, the three-phase coil 32 has six U-phase coils 32U, six V-phase coils 32V, and six W-phase coils 32W. However, the number of coils in each phase is not limited to six. In this embodiment, the stator 3 has the structure shown in FIG. 3 at the two coil ends 32a. However, the stator 3 may have a structure shown in FIG. 3 at one of the two coil ends 32a.

When a current flows through the three-phase coil 32, the three-phase coil 32 forms 10 × n magnetic poles. In this embodiment, n = 1. Therefore, in the present embodiment, when a current flows through the three-phase coil 32, the three-phase coil 32 forms 10 magnetic poles.

As shown in FIG. 3, three U-phase coils 32U adjacent to each other in the circumferential direction at each coil end 32a are referred to as a first coil U1, a second coil U2, and a third coil U3, respectively. As shown in FIG. 3, three V-phase coils 32V adjacent to each other in the circumferential direction at each coil end 32a are referred to as a first coil V1, a second coil V2, and a third coil V3, respectively. As shown in FIG. 3, the three W-phase coils 32W adjacent to each other in the circumferential direction at each coil end 32a are referred to as a first coil W1, a second coil W2, and a third coil W3, respectively. Each first coil U1, each second coil U2, each third coil U3, each first coil V1, each second coil V2, each third coil V3, each first coil W1, each The second coil W2 and each third coil W3 are also simply referred to as coils.

<U-phase coil 32U>
The 6 × n U-phase coils 32U include a 2 × n set of coil groups Ug, which is a set of first to third coils U1, U2, and U3 adjacent to each other in the circumferential direction at each coil end 32a. In the example shown in FIG. 5, the six U-phase coils 32U are a group of two coils in which the first to third coils U1, U2, and U3 adjacent to each other in the circumferential direction at each coil end 32a are a set. Contains Ug. In other words, the six U-phase coils 32U include two sets of coil groups Ug, and each coil group Ug of the six U-phase coils 32U is a first coil adjacent to each other in the circumferential direction at each coil end 32a. Includes U1, a second coil U2, and a third coil U3.

At each

coil end

32a, 2 × n sets of coil groups Ug out of the 6 U-phase coils 32U are arranged at equal intervals in the circumferential direction of the stator 3. At each coil end 32a, the first coil U1, the second coil U2, and the third coil U3 of each coil group Ug are arranged in this order in the circumferential direction of the stator 3. Each first coil U1 is arranged on the stator core 31 at a 2-slot pitch, and each second coil U2 is arranged on the stator core 31 at a 2-slot pitch, and each third coil U3 Are arranged on the stator core 31 at a pitch of one slot. At each coil end 32a, the third coil U3 of each coil group Ug is adjacent to the second coil U2 with one slot 311 interposed therebetween.

2 slot pitch means "every 2 slots". That is, the 2-slot pitch means that one coil is arranged in slot 311 every two slots. In other words, the 2-slot pitch means that one coil is arranged in slot 311 every other slot.

1 slot pitch means "every 1 slot". That is, one slot pitch means that one coil is arranged in two slots 311 adjacent to each other in the circumferential direction.

As shown in FIG. 5, at each coil end 32a, the third coil U3, the second coil U2, and the first coil U1 of each coil group Ug are arranged in this order in the axial direction. .. In other words, at each coil end 32a, in each coil group Ug, the third coil U3 is closest to the stator core 31, the first coil U1 is farthest to the stator core 31, and the second coil U2. Is located between the first coil U1 and the third coil U3 in the axial direction.

The first coil U1, the second coil U2, and the third coil U3 of each coil group Ug are connected in series.

A part of the first coil U1 and a part of the second coil U2 in each coil group Ug are arranged in one slot 311 out of 18 slots 311. That is, a part of the first coil U1 of each coil group Ug, together with a part of the second coil U2, is placed in one slot 311 (for example, the first slot) of the 18 slots 311. Have been placed.

In this case, the other part of the first coil U1 of each coil group Ug is arranged in one slot 311 together with a part of the coils of the other phase, and the first of the coil group Ug. The other part of the coil U2 of 2 is arranged in one slot 311 together with some of the coils of the other phase, and the third coil U3 of each coil group Ug is together with the coil of the other phase. It is arranged in one slot 311 (for example, a second slot).

For example, in FIG. 4, a part of the first coil U1 is a first part U1a of the first coil U1, and the other part of the first coil U1 is a second part of the first coil U1. U1b, part of the second coil U2 is the first part U2a of the second coil U2, and the other part of the second coil U2 is the second part U2b of the second coil U2. Yes, part of the third coil U3 is the first part U3a of the third coil U3, and the other part of the third coil U3 is the second part U3b of the third coil U3.

However, in the present application, a part of the first coil U1 may be read as a second part U1b of the first coil U1, and the other part of the first coil U1 may be referred to as a first coil U1. The part U1a of 1 may be read, a part of the second coil U2 may be read as the second part U2b of the second coil U2, and the other part of the second coil U2 may be read as the second part. It may be read as the first part U2a of the coil U2, a part of the third coil U3 may be read as the second part U3b of the third coil U3, and another part of the third coil U3. May be read as the first portion U3a of the third coil U3.

<V-phase coil 32V>
The 6 × n V-phase coils 32V include a 2 × n set of coil groups Vg, which is a set of first to third coils V1, V2, and V3 adjacent to each other in the circumferential direction at each coil end 32a. In the example shown in FIG. 5, the six V-phase coils 32V are a group of two coils in which the first to third coils V1, V2, and V3 adjacent to each other in the circumferential direction at each coil end 32a are a set. Contains Vg. In other words, the six V-phase coils 32V include two sets of coil groups Vg, and each coil group Vg of the six V-phase coils 32V is a first coil adjacent to each other in the circumferential direction at each coil end 32a. Includes V1, a second coil V2, and a third coil V3.

At each

coil end

32a, 2 × n sets of coil groups Vg out of the 6 V-phase coils 32V are arranged at equal intervals in the circumferential direction of the stator 3. At each coil end 32a, the first coil V1, the second coil V2, and the third coil V3 of each coil group Vg are arranged in this order in the circumferential direction of the stator 3. Each first coil V1 is arranged in the stator core 31 at a 2-slot pitch, and each second coil V2 is arranged in the stator core 31 at a 2-slot pitch, and each third coil V3. Are arranged on the stator core 31 at a pitch of one slot. At each coil end 32a, the third coil V3 of each coil group Vg is adjacent to the second coil V2 with one slot 311 interposed therebetween.

At each coil end 32a, the third coil V3, the second coil V2, and the first coil V1 of each coil group Vg are arranged in this order in the axial direction. In other words, at each coil end 32a, in each coil group Vg, the third coil V3 is closest to the stator core 31, the first coil V1 is farthest to the stator core 31, and the second coil V2. Is located between the first coil V1 and the third coil V3 in the axial direction.

The first coil V1, the second coil V2, and the third coil V3 of each coil group Vg are connected in series.

A part of the first coil V1 and a part of the second coil V2 in each coil group Vg are arranged in one slot 311 out of 18 slots 311. That is, a part of the first coil V1 of each coil group Vg is arranged in one slot 311 of the 18 slots 311 together with a part of the second coil V2.

In this case, the other part of the first coil V1 of each coil group Vg is arranged in one slot 311 together with a part of the coils of the other phase, and the first of the coil group Vg. The other part of the coil V2 of 2 is arranged in one slot 311 together with some of the coils of the other phase, and the third coil V3 of each coil group Vg is together with the coils of the other phase. It is arranged in one slot 311.

For example, in FIG. 4, a part of the first coil V1 is a first part V1a of the first coil V1, and the other part of the first coil V1 is a second part of the first coil V1. It is V1b, a part of the second coil V2 is a first part V2a of the second coil V2, and another part of the second coil V2 is a second part V2b of the second coil V2. Yes, part of the third coil V3 is the first part V3a of the third coil V3, and the other part of the third coil V3 is the second part V3b of the third coil V3.

However, in the present application, a part of the first coil V1 may be read as a second part V1b of the first coil V1, and the other part of the first coil V1 may be referred to as a first coil V1. A part of the second coil V2 may be read as a second part V2b of the second coil V2, and the other part of the second coil V2 may be read as a second part V1a. It may be read as the first part V2a of the coil V2, a part of the third coil V3 may be read as the second part V3b of the third coil V3, and another part of the third coil V3. May be read as the first portion V3a of the third coil V3.

<W phase coil 32W>
The 6 × n W-phase coils 32W include a 2 × n set of coil groups Wg in which the first to third coils W1, W2, and W3 adjacent to each other in the circumferential direction at each coil end 32a are a set. In the example shown in FIG. 5, the six W-phase coils 32W are a group of two coils in which the first to third coils W1, W2, and W3 adjacent to each other in the circumferential direction at each coil end 32a are a set. Contains Wg. In other words, the six W-phase coils 32W include two sets of coil groups Wg, and each coil group Wg of the six W-phase coils 32W is a first coil adjacent to each other in the circumferential direction at each coil end 32a. Includes W1, a second coil W2, and a third coil W3.

At each

coil end

32a, 2 × n sets of coil groups Wg out of the 6 W-phase coils 32W are arranged at equal intervals in the circumferential direction of the stator 3. At each coil end 32a, the first coil W1, the second coil W2, and the third coil W3 of each coil group Wg are arranged in this order in the circumferential direction of the stator 3. Each first coil W1 is arranged on the stator core 31 at a 2-slot pitch, each second coil W2 is arranged on the stator core 31 at a 2-slot pitch, and each third coil W3. Are arranged on the stator core 31 at a pitch of one slot. At each coil end 32a, the third coil W3 of each coil group Wg is adjacent to the second coil W2 with one slot 311 interposed therebetween.

At each coil end 32a, the third coil W3, the second coil W2, and the first coil W1 of each coil group Wg are arranged in this order in the axial direction. In other words, at each coil end 32a, in each coil group Wg, the third coil W3 is closest to the stator core 31, the first coil W1 is farthest to the stator core 31, and the second coil W2. Is located between the first coil W1 and the third coil W3 in the axial direction.

The first coil W1, the second coil W2, and the third coil W3 of each coil group Wg are connected in series.

A part of the first coil W1 and a part of the second coil W2 in each coil group Wg are arranged in one slot 311 out of 18 slots 311. That is, a part of the first coil W1 of each coil group Wg is arranged in one slot 311 of the 18 slots 311 together with a part of the second coil W2.

In this case, the other part of the first coil W1 of each coil group Wg is arranged in one slot 311 together with a part of the coils of the other phases, and the first of the coil groups Wg. The other part of the coil W2 of 2 is arranged in one slot 311 together with a part of the coils of the other phase, and the third coil W3 of each coil group Wg is together with the coils of the other phase. It is arranged in one slot 311.

For example, in FIG. 4, a part of the first coil W1 is a first part W1a of the first coil W1, and the other part of the first coil W1 is a second part of the first coil W1. W1b, a part of the second coil W2 is a first part W2a of the second coil W2, and another part of the second coil W2 is a second part W2b of the second coil W2. Yes, a part of the third coil W3 is a first part W3a of the third coil W3, and another part of the third coil W3 is a second part W3b of the third coil W3.

However, in the present application, a part of the first coil W1 may be read as a second part W1b of the first coil W1, and the other part of the first coil W1 may be referred to as a first coil W1. The part W1a of 1 may be read, a part of the second coil W2 may be read as the second part W2b of the second coil W2, and the other part of the second coil W2 may be read as the second part. It may be read as the first part W2a of the coil W2, a part of the third coil W3 may be read as the second part W3b of the third coil W3, and another part of the third coil W3. May be read as the first portion W3a of the third coil W3.

<Coil arrangement at coil end 32a>
The arrangement of the three-phase coil 32 at each coil end 32a will be specifically described below. As described above, each of the 6 × n U-phase coils 32U, the 6 × n V-phase coils 32V, and the 6 × n W-phase coils 32W each includes a set of first to third coils. 2 × n sets of coils are included. At each

coil end

32a, 2 × n sets of coils are arranged at equal intervals in the circumferential direction of the stator 3. In each phase, one set of coils (also referred to as each coil group) is three coils adjacent to each other in the circumferential direction.

At each coil end 32a of each phase, the first to third coils constituting each coil group are arranged in this order in the circumferential direction of the stator 3. In the example shown in FIG. 3, at each coil end 32a of each phase, the first coil, the second coil, and the third coil constituting each coil group are arranged in this order counterclockwise. .. However, at each coil end 32a of each phase, the first coil, the second coil, and the third coil constituting each coil group may be arranged in this order clockwise.

At least two coils in each coil group of each phase partially overlap in the radial direction. In this embodiment, the first coil and the second coil of each phase partially overlap in the radial direction. In other words, a part of the first coil and a part of the second coil of each phase overlap in the radial direction.

At each coil end 32a of each phase, the region where the first to third coils of each coil group are arranged is divided into an inner region and an outer region. The inner region is the region closest to the center of the stator core 31. The outer region is a region located outside the inner region in the xy plane. In other words, the outer region is the region farthest from the center of the stator core 31. In the present embodiment, at the coil end 32a of each coil group, the first coil is arranged in the outer region, the second coil is arranged from the inner region to the outer region, and the third coil is arranged inside. It is located in the area.

As shown in FIGS. 5 and 6, at each coil end 32a of each phase, the third coil, the second coil, and the first coil of each coil group are arranged in this order in the axial direction. ing. In other words, at each coil end 32a of each phase, in each coil group, the third coil is closest to the stator core 31, the first coil is farthest to the stator core 31, and the second coil is. , Is located between the first coil and the third coil in the axial direction.

<Outline of coil arrangement in slot 311>
As shown in FIG. 4, the first coil of each coil group of each phase is arranged in the outer layer of slot 311. The second coil of each coil group of each phase is arranged in the inner layer and the outer layer of the slot 311. Specifically, a part of each second coil is arranged in the inner layer of the slot 311 and the other part of the second coil is arranged in the outer layer of the slot 311. The third coil of each coil group of each phase is arranged in the inner layer of slot 311.

Therefore, as shown in FIG. 4, the coils of each phase are arranged in the 6 outer layers and the 6 inner layers of the slot 311.

<Arrangement of U-phase coil 32U in slot 311>
The arrangement of the U-phase coil 32U in the slot 311 will be specifically described below.
A part of each first coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the second coil of the U-phase coil 32U is arranged. The other part of each first coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the third coil of the W-phase coil 32W is arranged. Therefore, the other part of each first coil of the U-phase coil 32U is arranged in the slot 311 outside the third coil of the W-phase coil 32W in the radial direction.

A part of each second coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the first coil of the U-phase coil 32U is arranged. The other part of each second coil of the U-phase coil 32U is arranged in the outer layer of slot 311 in which the third coil of the V-phase coil 32V is arranged. Therefore, the other part of each second coil of the U-phase coil 32U is arranged in the slot 311 outside the third coil of the V-phase coil 32V in the radial direction.

A part of each third coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged. The other part of each third coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged. Therefore, each third coil of the U-phase coil 32U is arranged inside the coil of the other phase in the slot 311.

<Arrangement of V-phase coil 32V in slot 311>
The arrangement of the V-phase coil 32V in the slot 311 will be specifically described below.
A part of each first coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged. The other part of each first coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the third coil of the U-phase coil 32U is arranged. Therefore, the other part of each first coil of the V-phase coil 32V is arranged in the slot 311 outside the third coil of the U-phase coil 32U in the radial direction.

A part of each second coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged. The other part of each second coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the third coil of the W-phase coil 32W is arranged. Therefore, the other part of each second coil of the V-phase coil 32V is arranged in the slot 311 outside the third coil of the W-phase coil 32W in the radial direction.

A part of each third coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged. The other part of each third coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the second coil of the U-phase coil 32U is arranged. Therefore, each third coil of the V-phase coil 32V is arranged inside the coil of the other phase in the slot 311.

<Arrangement of W-phase coil 32W in slot 311>
The arrangement of the W-phase coil 32W in the slot 311 will be specifically described below.
A part of each first coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged. The other part of each first coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the third coil of the V-phase coil 32V is arranged. Therefore, the other part of each first coil of the W-phase coil 32W is arranged in the slot 311 outside the third coil of the V-phase coil 32V in the radial direction.

A part of each second coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged. The other part of each second coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the third coil of the U-phase coil 32U is arranged.

A part of each third coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the first coil of the U-phase coil 32U is arranged. The other part of each third coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged. Therefore, each third coil of the W-phase coil 32W is arranged inside the coil of the other phase in the slot 311.

<Modification example of coil arrangement>
In this application, "first coil" may be read as "third coil". In this case, in the example shown in FIG. 3, at the coil end 32a of each phase, the third coil, the second coil, and the first coil of each coil group are arranged in this order in the circumferential direction of the stator 3. Will be done. That is, in the example shown in FIG. 3, at the coil end 32a of each phase, the third coil, the second coil, and the first coil of each coil group are arranged in this order counterclockwise.

<Winding coefficient>
In the motor 1 according to the present embodiment, three slots 311 correspond to one magnetic pole of the rotor 2, and each coil group is arranged with two coils arranged at a two-slot pitch and at a one-slot pitch. It is composed of one coil. Therefore, the short-node winding coefficient kp2 of the fundamental wave component (γ = 1) of the coil arranged at the 2-slot pitch is kp2, and the short-node winding coefficient kp1 of the fundamental wave component (γ = 1) of the coil arranged at the 1-slot pitch is , It is calculated by the following formula.
sin [{S / (Q / P)} x (π / 2) x γ]
The short-node winding coefficient of the distributed winding three-phase coil 32 is a coefficient indicating the ratio of the amount of magnetic flux that one coil can interlink. Assuming that P is the number of magnetic poles of the three-phase coil 32, Q is the number of slots 311, S is the number of slot pitches, and γ is the order of harmonics, P = 10 and Q = 18 in this embodiment. Therefore, kp2 = 0.985 and kp1 = 0.766. Since the phases of the induced voltages generated in the coils arranged at the 2-slot pitch are different, the short-node winding coefficient kp2 does not become 1.

The distributed winding coefficient of the distributed winding three-phase coil 32 is a coefficient for correcting the phase difference of the magnetic flux interlinking with the three-phase coil 32. Since the coils arranged at the 2-slot pitch are out of phase by ± 10 ° with respect to the coils arranged at the 1-slot pitch, the distribution winding coefficient of the fundamental wave component (γ = 1) of the coils arranged at the 2-slot pitch is kd2 is calculated by the following formula.
kd2 = cos (10 ° x γ) = 0.985

Since the coils arranged at the 1-slot pitch in the present embodiment are the reference of the phase of the induced voltage generated in the 3-phase coil 32, the fundamental wave component (γ = 1) of the coils arranged at the 1-slot pitch The distribution winding coefficient kd1 is 1.

Therefore, in the present embodiment, the winding coefficient kw for the fundamental wave component in the motor 1 is obtained by the following equation.
kw = {kp2 × kd1 × (2/3)} + {kd1 × (1/3)} = 0.902

The ratio of the number of magnetic poles P to the number of slots S is P: S = 2: 3, and the winding coefficient of the stator of the centralized winding is usually 0.866. On the other hand, in the present embodiment, since the winding coefficient kw = 0.902, the magnetic flux emitted from the rotor 2 can be effectively used.

<Insulation member>
The stator 3 may have an insulating member that insulates the coils of each phase of the three-phase coil 32. The insulating member is, for example, insulating paper.

<Coil connection>
The three-phase coil 32 is connected by, for example, a delta connection. In this case, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected by a delta connection.

<Manufacturing method of stator 3>
An example of a method for manufacturing the stator 3 will be described.
An example of a method for manufacturing the stator 3 will be described in more detail below.

FIG. 7 is a flowchart showing an example of the manufacturing process of the stator 3.
FIG. 8 is a diagram showing an example of an insertion device 9 for inserting the three-phase coil 32 into the stator core 31.

FIG. 9 is a diagram showing an insertion step of the first coil in step S11.
In step S11, as shown in FIG. 9, the first coil of each phase is attached to the stator core 31 prepared in advance by the insertion tool 9. Specifically, at the coil end 32a, the first coils of each phase are arranged at equal intervals in the circumferential direction, and the first coils of each phase are arranged in a distributed winding in the outer layer of the slot 311 of the stator core 31. .. That is, the first coil of the U-phase coil 32U, the first coil of the V-phase coil 32V, and the first coil of the W-phase coil 32W are arranged in the outer layer of the slot 311 by distributed winding.

For example, a part of each first coil of the U-phase coil 32U is arranged in the outer layer of slot 311 in which the second coil of the U-phase coil 32U is arranged. The other part of each first coil of the U-phase coil 32U is arranged in the outer layer of slot 311 in which the third coil of the W-phase coil 32W is arranged. Therefore, the other part of each first coil of the U-phase coil 32U is arranged in the slot 311 outside the third coil of the W-phase coil 32W in the radial direction.

A part of each first coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged. The other part of each first coil of the V-phase coil 32V is arranged in the outer layer of slot 311 in which the third coil of the U-phase coil 32U is arranged. Therefore, the other part of each first coil of the V-phase coil 32V is arranged in the slot 311 outside the third coil of the U-phase coil 32U in the radial direction.

A part of each first coil of the W-phase coil 32W is arranged in the outer layer of slot 311 in which the second coil of the W-phase coil 32W is arranged. The other part of each first coil of the W-phase coil 32W is arranged in the outer layer of slot 311 in which the third coil of the V-phase coil 32V is arranged. Therefore, the other part of each first coil of the W-phase coil 32W is arranged in the slot 311 outside the third coil of the V-phase coil 32V in the radial direction.

When the three-phase coil 32 is inserted into the stator core 31 with the insertion tool 9 shown in FIG. 8, the coil is arranged between the blades 91 of the insertion tool 9, and the blade 91 is inserted inside the stator core 31 together with the coil. .. The coil is then slid axially and placed in slot 311. In steps S12 and S14, which will be described later, the three-phase coil 32 is inserted into the stator core 31 in the same manner.

FIG. 10 is a diagram showing an insertion step of the second coil in step S12.
In step S12, as shown in FIG. 10, the second coil of each phase is attached to the stator core 31 by the insertion tool 9. Specifically, at the coil end 32a, the second coils of each phase are arranged at equal intervals in the circumferential direction, and the second coils of each phase are arranged in a distributed winding in the outer layer and the inner layer of the slot 311.

For example, a part of each second coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the first coil of the U-phase coil 32U is arranged. The other part of each second coil of the U-phase coil 32U is arranged in the outer layer of slot 311 in which the third coil of the V-phase coil 32V is arranged.

A part of each second coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged. The other part of each second coil of the V-phase coil 32V is arranged in the outer layer of slot 311 in which the third coil of the W-phase coil 32W is arranged.

A part of each second coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged. The other part of each second coil of the W-phase coil 32W is arranged in the outer layer of slot 311 in which the third coil of the U-phase coil 32U is arranged.

In step S13, an insulating member is arranged in the slot 311 so as to insulate the coils of each phase of the three-phase coil 32. Specifically, the insulating member is arranged in the slot 311 in which one coil is arranged in the outer layer of the slot 311. In this embodiment, the insulating member is arranged in the 12 slots 311.

FIG. 11 is a diagram showing an insertion step of the third coil in step S14.
In step S14, as shown in FIG. 11, the third coil of each phase is attached to the stator core 31 by the insertion tool 9. Specifically, at the coil end 32a, the third coils of each phase are arranged at equal intervals in the circumferential direction, and the third coils of each phase are arranged in a distributed winding in the inner layer of the slot 311. That is, the third coil of the U-phase coil 32U, the third coil of the V-phase coil 32V, and the third coil of the W-phase coil 32W are arranged in the inner layer of the slot 311 by distributed winding.

For example, a part of each third coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged. The other part of each third coil of the U-phase coil 32U is arranged in the inner layer of slot 311 in which the second coil of the W-phase coil 32W is arranged. Therefore, each third coil of the U-phase coil 32U is arranged inside the coil of the other phase in slot 311.

A part of each third coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged. The other part of each third coil of the V-phase coil 32V is arranged in the inner layer of slot 311 in which the second coil of the U-phase coil 32U is arranged. Therefore, each third coil of the V-phase coil 32V is arranged inside the coil of the other phase in the slot 311.

A part of each third coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the first coil of the U-phase coil 32U is arranged. The other part of each third coil of the W-phase coil 32W is arranged in the inner layer of slot 311 in which the second coil of the V-phase coil 32V is arranged. Therefore, each third coil of the W-phase coil 32W is arranged inside the coil of the other phase in the slot 311.

In steps S11 to S14, each first coil is arranged in a distributed winding on the stator core 31 at a 2-slot pitch, and each second coil is arranged in a distributed winding on the stator core 31 at a 2-slot pitch. , Each third coil is arranged in a distributed winding around the stator core 31 at a pitch of one slot. As a result, the three-phase coil 32 is attached to the stator core 31 in a distributed winding so that the three-phase coil 32 has the arrangement described in this embodiment at each coil end 32a and slot 311 of the three-phase coil 32. ..

In step S15, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected to each other. For example, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected by a delta connection. Further, the shape of the connected three-phase coil 32 is adjusted. As a result, the stator 3 shown in FIG. 3 is obtained.

<Comparison example>
FIG. 12 is a top view showing the motor 1a according to the comparative example.
In the comparative example, the three-phase coil 32 is lapped and attached to the stator core 31. In this case, at each coil end 32a, one side of each coil is arranged in the outer layer of slot 311 and the other side of the coil is arranged in the inner layer of the other slot 311.

Therefore, when the three-phase coil 32 is lapped and attached to the stator core 31, it is difficult to attach the three-phase coil 32 to the stator core 31 using an insertion tool (for example, the insertion tool 9 shown in FIG. 8). .. Therefore, usually, when the three-phase coil 32 is attached to the stator core 31 by lap winding as in the comparative example, the three-phase coil 32 is attached to the stator core 31 by hand. In this case, the productivity of the stator 3 decreases.

When two coils are arranged in each slot, there is a difference in inductance between the two coils in each slot. In this case, the current flowing through the three-phase coil varies between the phases while the motor is being driven, so that the current does not easily flow in the phase having a large inductance, and the current tends to flow in the phase having a small inductance. As a result, torque ripple occurs. For example, a torque ripple that is twice the electrical angular period is generated. In an electric motor having a stator forming 10 magnetic poles, torque ripple having a frequency 10 times the rotational speed is generated.

When there is a difference in inductance between the coil groups, the current does not flow evenly in the coil groups, causing current imbalance. In this case, the amplitude of the current flowing through the coil group having a small inductance becomes large, and the phase of the current advances. The amplitude of the current flowing through the coil group with large inductance becomes small, and the phase of the current is delayed. As a result, the torque of the motor is output in a phase-shifted state, so that the sum of the peak values of the amplitudes of the currents flowing through each coil group is larger than the sum of the peak values of the amplitudes of the phase currents. Losses such as copper loss caused by resistance increase.

<Advantages of stator 3>
FIG. 13 is a diagram showing a comparison with the winding coefficient of the stator in the comparative example.
In the table shown in FIG. 13, the fundamental wave and each harmonic are components included in the induced voltage generated in each phase.
In FIG. 13, Comparative Example 1 is the motor 1a shown in FIG. Comparative Example 2 is an electric motor including a three-phase coil having 10 magnetic poles formed and attached to the stator core by centralized winding, and a stator core having 15 slots.

In the motor 1 according to the present embodiment, the winding coefficient of the harmonic component is small as a whole. Therefore, in the motor 1 according to the present embodiment, the torque ripple can be reduced. In particular, as compared with Comparative Example 1, the winding coefficient in the third harmonic component can be reduced.

In Comparative Example 1, the winding coefficient of the fundamental wave component is high. Therefore, the magnetic flux of the rotor can be effectively used. Further, in Comparative Example 1, the winding coefficients of the 5th harmonic component, the 7th harmonic component, the 11th harmonic component, and the 13th harmonic component are small. Therefore, in Comparative Example 1, the torque ripple can be reduced. However, in Comparative Example 1, the winding coefficient of the third harmonic component is large. Therefore, for example, when the three-phase coils 32 of the motor 1a according to Comparative Example 1 are connected by a delta connection, a circulating current is generated in the three-phase coils 32, and the performance of the motor 1a deteriorates.

In Comparative Example 2, the winding coefficient of the fundamental wave is small, and the winding coefficient of the 5th harmonic component, the 7th harmonic component, the 11th harmonic component, and the 13th harmonic component is large. Therefore, the utilization rate of the magnetic flux of the rotor decreases, and in Comparative Example 2, a larger current is required to output the torque equivalent to that of the motor 1 according to the present embodiment. Further, since the winding coefficients of the 5th harmonic component, the 7th harmonic component, the 11th harmonic component, and the 13th harmonic component are large, the torque ripple tends to be large.

Normally, in an electric motor having a centralized winding stator, the size of the coil end of the three-phase coil in the axial direction is small, so that the electric resistance of the three-phase coil can be reduced. Therefore, in an electric motor having a centrally wound stator, copper loss can be reduced. However, as the torque output increases, the influence of the axial size of the coil end of the 3-phase coil decreases, so the motor efficiency (that is, the utilization rate of the magnetic flux of the rotor) due to the size of the winding coefficient is taken into consideration. It is desirable to do.

In the present embodiment, the winding coefficients of the 3rd harmonic component, the 5th harmonic component, and the 13th harmonic component are smaller than those of Comparative Example 1, and the 7th harmonic component and the 11th harmonic component are smaller. The winding coefficients of are equivalent to those of Comparative Example 1. Therefore, in the present embodiment, an increase in torque ripple can be suppressed. Further, in the motor 1 according to the present embodiment, even when the three-phase coils 32 are connected by a delta connection, the generation of circulating current in the three-phase coils 32 can be reduced, and as a result, the performance of the motor 1 can be reduced. Can be suppressed.

Normally, at the coil end, when three coils of different phases are stacked in the axial direction, the length of the coil arranged on the outermost side in the axial direction is longer than the length of the coils of the other phases. In this case, the electrical resistance of the coil increases and the copper loss in the motor increases. On the other hand, in the present embodiment, the three-phase coil 32 is arranged on the stator core 31 so that the three coils having different phases are not stacked in the axial direction. Therefore, since the size of the coil end 32a of the three-phase coil 32 in the axial direction is small, the electric resistance of the three-phase coil 32 can be reduced. As a result, the copper loss in the motor 1 can be reduced.

Furthermore, when the first coil, the second coil, and the third coil of each coil group are connected in parallel, the balance of the coil arrangement is likely to be lost. Therefore, the loss due to the imbalance of the current between the coils connected in parallel tends to increase. On the other hand, in the present embodiment, the first coil, the second coil, and the third coil of each coil group are connected in series. Therefore, when the first coil, the second coil, and the third coil of each coil group are connected in series, it is possible to suppress an increase in loss due to current imbalance between the coils.

According to the method for manufacturing the stator 3, the stator 3 having the advantages described in the present embodiment can be manufactured. Further, according to the method for manufacturing the stator 3, the three-phase coil 32 can be attached to the stator core 31 by using the insertion tool 9. Therefore, for example, the stator 3 can be manufactured more efficiently than the stator 3a described as a comparative example. Further, since the coil longer in the circumferential direction than the third coil is arranged in the outer layer of the slot 311, the arrangement of the third coil is easy.

Embodiment 2.
FIG. 14 is a top view schematically showing the structure of the motor 1 according to the second embodiment.
In the second embodiment, the arrangement of the three-phase coil 32 is different from the arrangement described in the first embodiment. In the second embodiment, a configuration different from that of the first embodiment will be described. The configuration not described in the present embodiment can be the same as that in the first embodiment.

<Stator 3>
FIG. 15 is a top view schematically showing the structure of the stator 3 in the second embodiment.
FIG. 16 is a diagram schematically showing the arrangement of the coil end 32a and the three-phase coil 32 in the slot 311. In FIG. 16, the dashed line indicates the coil of each phase at the coil end 32a, and the chain line indicates the boundary between the inner layer and the outer layer in each slot 311.

In the examples shown in FIGS. 15 and 16, the stator core 31 has 18 slots 311 as in the first embodiment.

<Coil arrangement at coil end 32a>
In the present embodiment, at the coil end 32a of each coil group, the first coil is arranged in the inner region, the second coil is arranged in the outer region, and the third coil is arranged from the inner region to the outer region. It is arranged over the area.

FIG. 17 is a diagram schematically showing the structure of the stator 3 as seen from the center of the stator 3 shown in FIG.
FIG. 18 is a diagram schematically showing the structure of the stator 3 as seen from the outside of the stator 3 shown in FIG.
As shown in FIGS. 17 and 18, at each coil end 32a of each phase, in each coil group, the third coil is closest to the stator core 31 and the second coil is to the stator core 31. The farthest. The first coil may be located between the second coil and the third coil in the axial direction, may be the same height as the second coil in the axial direction, and may be the same height as the second coil in the axial direction, and the third coil in the axial direction. It may be the same height as.

<Outline of coil arrangement in slot 311>
The first coil of each coil group of each phase is arranged in the inner layer of slot 311. The second coil of each coil group of each phase is arranged in the outer layer of slot 311. The third coil of each coil group of each phase is arranged in the outer layer and the inner layer of the slot 311.

Therefore, as shown in FIG. 15, the coils of each phase are arranged in the 6 outer layers and the 6 inner layers of the slot 311.

<Arrangement of U-phase coil 32U in slot 311>
The arrangement of the U-phase coil 32U in the slot 311 will be specifically described below.
A part of each first coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the second coil of the U-phase coil 32U is arranged. The other part of each first coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the third coil of the W-phase coil 32W is arranged. Therefore, the other part of each first coil of the U-phase coil 32U is arranged inside the third coil of the W-phase coil 32W in the radial direction in the slot 311.

A part of each second coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the first coil of the U-phase coil 32U is arranged. The other part of each second coil of the U-phase coil 32U is arranged in the outer layer of slot 311 in which the third coil of the V-phase coil 32V is arranged. Therefore, the other part of each second coil of the U-phase coil 32U is arranged in the slot 311 outside the third coil of the V-phase coil 32V in the radial direction.

A part of each third coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged. The other part of each third coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged. Therefore, the other part of each third coil of the U-phase coil 32U is arranged inside the second coil of the W-phase coil 32W in the radial direction in the slot 311.

<Arrangement of V-phase coil 32V in slot 311>
The arrangement of the V-phase coil 32V in the slot 311 will be specifically described below.
A part of each first coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged. The other part of each first coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the third coil of the U-phase coil 32U is arranged. Therefore, the other part of each first coil of the V-phase coil 32V is arranged inside the third coil of the U-phase coil 32U in the radial direction in the slot 311.

A part of each second coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged. The other part of each second coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the third coil of the W-phase coil 32W is arranged. Therefore, the other part of each second coil of the V-phase coil 32V is arranged in the slot 311 outside the third coil of the W-phase coil 32W in the radial direction.

A part of each third coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged. The other part of each third coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the second coil of the U-phase coil 32U is arranged. Therefore, the other part of each third coil of the V-phase coil 32V is arranged inside the second coil of the U-phase coil 32U in the radial direction in the slot 311.

<Arrangement of W-phase coil 32W in slot 311>
The arrangement of the W-phase coil 32W in the slot 311 will be specifically described below.
A part of each first coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged. The other part of each first coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the third coil of the V-phase coil 32V is arranged. Therefore, the other part of each first coil of the W-phase coil 32W is arranged inside the third coil of the V-phase coil 32V in the radial direction in the slot 311.

A part of each second coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged. The other part of each second coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the third coil of the U-phase coil 32U is arranged. Therefore, the other part of each second coil of the W-phase coil 32W is arranged in the slot 311 outside the third coil of the U-phase coil 32U in the radial direction.

A part of each third coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the first coil of the U-phase coil 32U is arranged. The other part of each third coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged. Therefore, the other part of each third coil of the W-phase coil 32W is arranged inside the second coil of the V-phase coil 32V in the radial direction in the slot 311.

<Winding coefficient>
The winding coefficient kw for the fundamental wave component in the motor 1 according to the present embodiment is the same as that in the first embodiment.

<Coil connection>
The three-phase coil 32 is connected by, for example, a delta connection.

<Manufacturing method of stator 3>
An example of the method for manufacturing the stator 3 described in the second embodiment will be described.
FIG. 19 is a flowchart showing an example of the manufacturing process of the stator 3.

FIG. 20 is a diagram showing an insertion step of the second coil in step S21.
In step S21, as shown in FIG. 20, the second coil of each phase is attached to the stator core 31 prepared in advance by the insertion tool 9. Specifically, at the coil end 32a, the second coils of each phase are arranged at equal intervals in the circumferential direction, and the second coils of each phase are arranged in a distributed winding in the outer layer of the slot 311 of the stator core 31. .. That is, the second coil of the U-phase coil 32U, the second coil of the V-phase coil 32V, and the second coil of the W-phase coil 32W are arranged in the outer layer of the slot 311 by distributed winding.

In step S22, an insulating member is arranged in the slot 311 so as to insulate the coils of each phase of the three-phase coil 32. Specifically, an insulating member is arranged between each second coil and the third coil arranged in the inner layer of the slot 311 in step S23. In step S22, for example, the insulating member is arranged in the six slots 311.

FIG. 21 is a diagram showing an insertion step of the third coil in step S23.
In step S23, as shown in FIG. 21, the third coil of each phase is attached to the stator core 31 by the insertion tool 9. Specifically, at the coil end 32a, the second coils of each phase are arranged at equal intervals in the circumferential direction, and the third coils of each phase are arranged in a distributed winding in the outer layer and the inner layer of the slot 311.

For example, a part of each third coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged. The other part of each third coil of the U-phase coil 32U is arranged in the inner layer of slot 311 in which the second coil of the W-phase coil 32W is arranged. Therefore, the other part of each third coil of the U-phase coil 32U is arranged inside the second coil of the W-phase coil 32W in the radial direction in the slot 311.

A part of each third coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged. The other part of each third coil of the V-phase coil 32V is arranged in the inner layer of slot 311 in which the second coil of the U-phase coil 32U is arranged. Therefore, the other part of each third coil of the V-phase coil 32V is arranged inside the second coil of the U-phase coil 32U in the radial direction in the slot 311.

A part of each third coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the first coil of the U-phase coil 32U is arranged. The other part of each third coil of the W-phase coil 32W is arranged in the inner layer of slot 311 in which the second coil of the V-phase coil 32V is arranged. Therefore, the other part of each third coil of the W-phase coil 32W is arranged inside the second coil of the V-phase coil 32V in the radial direction in the slot 311.

In step S24, an insulating member is arranged in the slot 311 so as to insulate the coils of each phase of the three-phase coil 32. Specifically, an insulating member is arranged between each third coil arranged in the outer layer and the first coil arranged in the inner layer of the slot 311 in step S25. In step S24, for example, the insulating member is arranged in the six slots 311.

FIG. 22 is a diagram showing an insertion step of the first coil in step S25.
In step S25, as shown in FIG. 22, the first coil of each phase is attached to the stator core 31 by the insertion tool 9. Specifically, at the coil end 32a, the first coils of each phase are arranged at equal intervals in the circumferential direction, and the first coils of each phase are arranged in a distributed winding in the inner layer of the slot 311 of the stator core 31. .. That is, the first coil of the U-phase coil 32U, the first coil of the V-phase coil 32V, and the first coil of the W-phase coil 32W are arranged in the inner layer of the slot 311 by distributed winding.

For example, a part of each first coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the second coil of the U-phase coil 32U is arranged. The other part of each first coil of the U-phase coil 32U is arranged in the inner layer of slot 311 in which the third coil of the W-phase coil 32W is arranged. Therefore, the other part of each first coil of the U-phase coil 32U is arranged inside the third coil of the W-phase coil 32W in the radial direction in the slot 311.

A part of each first coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged. The other part of each first coil of the V-phase coil 32V is arranged in the inner layer of slot 311 in which the third coil of the U-phase coil 32U is arranged. Therefore, the other part of each first coil of the V-phase coil 32V is arranged inside the third coil of the U-phase coil 32U in the radial direction in the slot 311.

A part of each first coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged. The other part of each first coil of the W-phase coil 32W is arranged in the inner layer of slot 311 in which the third coil of the V-phase coil 32V is arranged. Therefore, the other part of each first coil of the W-phase coil 32W is arranged inside the third coil of the V-phase coil 32V in the radial direction in the slot 311.

In steps S21 to S25, each first coil is arranged in a distributed winding on the stator core 31 at a 2-slot pitch, and each second coil is arranged in a distributed winding on the stator core 31 at a 2-slot pitch. , Each third coil is arranged in a distributed winding around the stator core 31 at a pitch of one slot. As a result, the three-phase coil 32 is attached to the stator core 31 in a distributed winding so that the three-phase coil 32 has the arrangement described in this embodiment at each coil end 32a and slot 311 of the three-phase coil 32. ..

In step S26, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected to each other. For example, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected by a delta connection. Further, the shape of the connected three-phase coil 32 is adjusted. As a result, the stator 3 shown in FIG. 15 is obtained.

<Advantages of stator 3>
The stator 3 in the present embodiment has the advantages described in the first embodiment.

Further, at each coil end 32a, a first coil and a second coil are arranged on each third coil. In other words, at each coil end 32a, the first coil and the second coil are arranged outside each third coil in the axial direction. That is, at each coil end 32a, each third coil is arranged between the first coil and the second coil and the stator core 31. In this case, the first coil does not overlap the second coil in the xy plane. Therefore, the size of the coil end 32a in the axial direction can be suppressed.

According to the method for manufacturing the stator 3 in the present embodiment, the stator 3 having the advantages described in the present embodiment can be manufactured.

Further, the method for manufacturing the stator 3 in the present embodiment has the advantages described in the first embodiment.

Further, in the method for manufacturing the stator 3 in the present embodiment, the first coil and the second coil are arranged on each third coil at each coil end 32a. In other words, at each coil end 32a, the first coil and the second coil are arranged outside each third coil in the axial direction. Therefore, the third coil can be easily attached to the stator core 31. In other words, when the third coil is attached to the stator core 31, the second coil does not interfere with the attachment of the third coil.

Embodiment 3.
FIG. 23 is a top view schematically showing the structure of the motor 1 according to the third embodiment.
In the third embodiment, the arrangement of the three-phase coil 32 is different from the arrangement described in the first embodiment. In the third embodiment, a configuration different from that of the first embodiment will be described. The configuration not described in the present embodiment can be the same as that in the first embodiment.

<Stator 3>
FIG. 24 is a top view schematically showing the structure of the stator 3 in the third embodiment.
FIG. 25 is a diagram schematically showing the arrangement of the coil end 32a and the three-phase coil 32 in the slot 311. In FIG. 25, the dashed line indicates the coil of each phase at the coil end 32a, and the chain line indicates the boundary between the inner layer and the outer layer in each slot 311.

In the examples shown in FIGS. 24 and 25, the stator core 31 has 18 slots 311 as in the first embodiment.

<Coil arrangement at coil end 32a>
In the present embodiment, at the coil end 32a of each coil group, the first coil is arranged in the inner region, the second coil is arranged from the outer region to the inner region, and the third coil is arranged on the outer region. It is located in the area.

FIG. 26 is a diagram schematically showing the structure of the stator 3 as seen from the center of the stator 3 shown in FIG. 23.
FIG. 27 is a diagram schematically showing the structure of the stator 3 as seen from the outside of the stator 3 shown in FIG. 23.
As shown in FIGS. 26 and 27, at each coil end 32a of each phase, in each coil group, the third coil is closest to the stator core 31 and the first coil is the stator core 31. The farthest.

<Outline of coil arrangement in slot 311>
The first coil of each coil group of each phase is arranged in the inner layer of slot 311. The second coil of each coil group of each phase is arranged in the outer layer and the inner layer of the slot 311. The third coil of each coil group of each phase is arranged in the outer layer of slot 311.

A part of each second coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the first coil of the U-phase coil 32U is arranged. The other part of each second coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the third coil of the V-phase coil 32V is arranged. Therefore, the other part of each second coil of the U-phase coil 32U is arranged inside the third coil of the V-phase coil 32V in the radial direction in the slot 311.

A part of each third coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged. The other part of each third coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged. Therefore, the other part of each third coil of the U-phase coil 32U is arranged in the slot 311 outside the second coil of the W-phase coil 32W in the radial direction.

A part of each second coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged. The other part of each second coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the third coil of the W-phase coil 32W is arranged. Therefore, the other part of each second coil of the V-phase coil 32V is arranged inside the third coil of the W-phase coil 32W in the radial direction in the slot 311.

A part of each third coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged. The other part of each third coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the second coil of the U-phase coil 32U is arranged. Therefore, the other part of each third coil of the V-phase coil 32V is arranged in the slot 311 outside the second coil of the U-phase coil 32U in the radial direction.

A part of each second coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged. The other part of each second coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the third coil of the U-phase coil 32U is arranged. Therefore, the other part of each second coil of the W-phase coil 32W is arranged inside the third coil of the U-phase coil 32U in the radial direction in the slot 311.

A part of each third coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the first coil of the U-phase coil 32U is arranged. The other part of each third coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged. Therefore, the other part of each third coil of the W-phase coil 32W is arranged in the slot 311 outside the second coil of the V-phase coil 32V in the radial direction.

<Coil connection>
FIG. 28 is a schematic diagram showing an example of delta connection of the three-phase coil 32 in the third embodiment.
FIG. 29 is a diagram showing an example of a three-phase coil 32 connected by a delta connection in the third embodiment.
The three-phase coil 32 is connected by, for example, a delta connection. Therefore, as compared with, for example, a star connection, the voltage applied to the three-phase coil 32 can be reduced while maintaining the output of the motor 1. As described in the first embodiment, in the motor 1, the third harmonic component included in the induced voltage generated in each phase can be reduced. Therefore, even when the three-phase coil 32 is connected by the delta connection, the generation of the circulating current in the three-phase coil 32 can be reduced, and as a result, the deterioration of the performance of the motor 1 can be suppressed.

<Manufacturing method of stator 3>
An example of the method for manufacturing the stator 3 described in the third embodiment will be described.
FIG. 30 is a flowchart showing an example of the manufacturing process of the stator 3.

FIG. 31 is a diagram showing an insertion step of the third coil in step S31.
In step S31, as shown in FIG. 31, the third coil of each phase is attached to the stator core 31 prepared in advance by the insertion tool 9. Specifically, at the coil end 32a, the third coils of each phase are arranged at equal intervals in the circumferential direction, and the third coils of each phase are arranged in a distributed winding in the outer layer of the slot 311. That is, the third coil of the U-phase coil 32U, the third coil of the V-phase coil 32V, and the third coil of the W-phase coil 32W are arranged in the outer layer of the slot 311 by distributed winding.

In step S32, an insulating member is arranged in the slot 311 so as to insulate the coils of each phase of the three-phase coil 32. Specifically, the insulating member is arranged in the slot 311 in which the third coil is arranged. In this case, the insulating member is arranged inside each third coil in the radial direction. In this embodiment, the insulating member is arranged in the 12 slots 311.

FIG. 32 is a diagram showing an insertion step of the second coil in step S33.
In step S33, as shown in FIG. 32, the second coil of each phase is attached to the stator core 31 by the insertion tool 9. Specifically, at the coil end 32a, the second coils of each phase are arranged at equal intervals in the circumferential direction, and the second coils of each phase are arranged in a distributed winding in the outer layer and the inner layer of the slot 311.

For example, a part of each second coil of the U-phase coil 32U is arranged in the outer layer of slot 311 in which the first coil of the U-phase coil 32U is arranged. The other part of each second coil of the U-phase coil 32U is arranged in the inner layer of slot 311 in which the third coil of the V-phase coil 32V is arranged.

A part of each second coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged. The other part of each second coil of the V-phase coil 32V is arranged in the inner layer of slot 311 in which the third coil of the W-phase coil 32W is arranged.

A part of each second coil of the W-phase coil 32W is arranged in the outer layer of slot 311 in which the first coil of the W-phase coil 32W is arranged. The other part of each second coil of the W-phase coil 32W is arranged in the inner layer of slot 311 in which the third coil of the U-phase coil 32U is arranged.

FIG. 33 is a diagram showing an insertion step of the first coil in step S34.
In step S34, as shown in FIG. 33, the first coil of each phase is attached to the stator core 31 by the insertion tool 9. Specifically, at the coil end 32a, the first coils of each phase are arranged at equal intervals in the circumferential direction, and the first coils of each phase are arranged in a distributed winding in the inner layer of the slot 311 of the stator core 31. .. That is, the first coil of the U-phase coil 32U, the first coil of the V-phase coil 32V, and the first coil of the W-phase coil 32W are arranged in the inner layer of the slot 311 by distributed winding.

In steps S31 to S34, each first coil is arranged in a distributed winding on the stator core 31 at a 2-slot pitch, and each second coil is arranged in a distributed winding on the stator core 31 at a 2-slot pitch. , Each third coil is arranged in a distributed winding around the stator core 31 at a pitch of one slot. As a result, the three-phase coil 32 is attached to the stator core 31 in a distributed winding so that the three-phase coil 32 has the arrangement described in this embodiment at each coil end 32a and slot 311 of the three-phase coil 32. ..
In step S35, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected to each other. For example, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected by a delta connection. Further, the shape of the connected three-phase coil 32 is adjusted. As a result, the stator 3 shown in FIG. 24 is obtained.

Further, at each coil end 32a, among the first to third coils of each coil group, the first coil arranged in the inner layer is at the highest position in the axial direction, and the third coil arranged in the outer layer. Is at the lowest position in the axial direction. Therefore, it is possible to prevent the three-phase coil 32 from spreading outward in the xy plane.

Further, at each coil end 32a of each phase, the third coil is the closest to the stator core 31 and the first coil is the farthest to the stator core 31 in each coil group. Therefore, in the outer region of each coil end 32a, the size of the coil end 32a in the axial direction can be suppressed.

According to the method for manufacturing the stator 3, the stator 3 having the advantages described in the present embodiment can be manufactured.

Further, in the method for manufacturing the stator 3 in the present embodiment, at each coil end 32a, the third coil among the first to third coils of each coil group is first arranged in the outer layer of the slot 311. .. Therefore, the first coil and the second coil can be easily attached to the stator core 31, and a compact coil end 32a can be formed.

Modification example.
FIG. 34 is a diagram showing another example of the stator core 31 according to the third embodiment. The arrangement of the three-phase coil 32 shown in FIG. 34 is the same as the arrangement of the three-phase coil 32 shown in FIG. 24.
The stator 3 may have a stator core 31a instead of the stator core 31. The stator core 31a is divided into a plurality of divided cores 31b. That is, the stator core 31a is composed of a plurality of divided cores 31b. Each split core 31b has at least one slot 311. The stator core 31a shown in FIG. 34 can also be applied to the stator core 31 in the first embodiment and the stator core 31 in the second embodiment.

In the stator core 31a, each slot 311 in which the first coil (specifically, a part of the first coil) and the second coil (specifically, a part of the second coil) are arranged is arranged. Is divided into a plurality of divided cores 31b. In the example shown in FIG. 34, the stator core 31a is divided into six dividing cores 31b. A coil having a different phase from each other is attached to each of the divided cores 31b. Specifically, two coils arranged at a one-slot pitch and one coil arranged at a two-slot pitch are attached to each of the divided cores 31b.

35 to 37 are views schematically showing a manufacturing process of the stator core 31a shown in FIG. 34. In FIGS. 35 to 37, a part of the stator core 31a is shown.
As shown in FIG. 35, a plurality of split cores 31b are arranged in a straight line. A first coil, a second coil, and a third coil connected in series for each coil group of each phase are simultaneously arranged in slot 311. The first coil, the second coil, and the third coil of each coil group of each phase are connected by, for example, a string.

FIG. 35 shows an example in which the first coil W1, the second coil W2, and the third coil W3 of the W-phase coils 32W are arranged. FIG. 36 shows an example in which the first coil V1, the second coil V2, and the third coil V3 of the V-phase coils 32V are arranged. FIG. 37 shows an example in which the first coil U1, the second coil U2, and the third coil U3 of the U-phase coils 32U are arranged.

After arranging the first coil, the second coil, and the third coil of each coil group of each phase in the slot 311, the string is cut. These steps are repeated.

After attaching the three-phase coils 32 to the split cores 31b, these split cores 31b are arranged in an annular core such that the stator 3 has the arrangement of the three-phase coils 32 shown in FIG. The U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W connect to each other. For example, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected by a delta connection. Further, the shape of the connected three-phase coil 32 is adjusted. As a result, the stator 3 shown in FIG. 34 is obtained. In the manufacturing process of the stator core 31a shown in FIG. 34, since the first coil, the second coil, and the third coil connected in series are attached to the split core 31b, the three-phase coil 32 is attached to the stator core 31b. After mounting on 31a, the step of connecting the first coil, the second coil, and the third coil in series can be reduced.

Embodiment 4.
FIG. 38 is a top view schematically showing the structure of the motor 1 according to the fourth embodiment.
In the fourth embodiment, the arrangement of the three-phase coil 32 is different from the arrangement described in the first embodiment. In the fourth embodiment, a configuration different from that of the first embodiment will be described. The configuration not described in the present embodiment can be the same as that in the first embodiment.

<Stator 3>
FIG. 39 is a top view schematically showing the structure of the stator 3 in the fourth embodiment.
FIG. 40 is a diagram schematically showing the arrangement of the three-phase coil 32 at the coil end 32a and the arrangement of the three-phase coil 32 in the slot 311. In FIG. 40, the dashed line indicates the coil of each phase at the coil end 32a, and the chain line indicates the boundary between the inner layer and the outer layer in each slot 311.

In the example shown in FIG. 39, the stator core 31 has 18 slots 311 as in the first embodiment.
<Coil arrangement at coil end 32a>
At each coil end 32a of each phase, the first to third coils constituting each coil group are arranged in this order in the circumferential direction of the stator 3. At each coil end 32a, the first coil of each coil group of each phase is arranged on the stator core 31 at a 1-slot pitch, and the second coil of each coil group of each phase has a stator at a 1-slot pitch. It is arranged in the iron core 31, and the third coil of each coil group of each phase is arranged in the stator core 31 at a 2-slot pitch.

At each coil end 32a, the third coil of each coil group of each phase is adjacent to the second coil with one slot 311 interposed therebetween.

In the example shown in FIG. 39, at the coil end 32a of each coil group, the first coil is arranged from the inner region to the outer region, the second coil is arranged in the outer region, and the third coil is arranged. Is located in the inner area.

FIG. 41 is a diagram schematically showing the structure of the stator 3 as seen from the center of the stator 3 shown in FIG. 39.
FIG. 42 is a diagram schematically showing the structure of the stator 3 as seen from the outside of the stator 3 shown in FIG. 39.
As shown in FIGS. 41 and 42, in each coil end 32a of each phase, in each coil group, the first coil and the second coil have a stator core 31 as compared with the third coil. close. Among each coil group, the third coil is the farthest from the stator core 31.

<Outline of coil arrangement in slot 311>
The first coil of each coil group of each phase is arranged in the outer layer and the inner layer of the slot 311. The second coil of each coil group of each phase is arranged in the outer layer of slot 311. In each coil group of each phase, part of the second coil is another slot 311 (eg, first slot) adjacent to slot 311 (eg, first slot) in which part of the first coil is located. It is located in (2 slots).
The third coil of each coil group of each phase is arranged in the inner layer of slot 311.

Therefore, as shown in FIG. 40, the coils of each phase are arranged in the 6 outer layers and the 6 inner layers of the slot 311.

<Arrangement of U-phase coil 32U in slot 311>
The arrangement of the U-phase coil 32U in the slot 311 will be specifically described below.
A part of each first coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the third coil of the W-phase coil 32W is arranged. The other part of each first coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged.

A part of each second coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the third coil of the V-phase coil 32V is arranged. The other part of each second coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged.

A part of each third coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged. The other part of each third coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged.

<Arrangement of V-phase coil 32V in slot 311>
The arrangement of the V-phase coil 32V in the slot 311 will be specifically described below.
A part of each first coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the third coil of the U-phase coil 32U is arranged. The other part of each first coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged.

A part of each second coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the third coil of the W-phase coil 32W is arranged. The other part of each second coil of the V-phase coil 32V is arranged in the outer layer of slot 311 in which the first coil of the U-phase coil 32U is arranged.

A part of each third coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the second coil of the U-phase coil 32U is arranged. The other part of each third coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged.

<Arrangement of W-phase coil 32W in slot 311>
The arrangement of the W-phase coil 32W in the slot 311 will be specifically described below.
A part of each first coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the third coil of the V-phase coil 32V is arranged. The other part of each first coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the second coil of the U-phase coil 32U is arranged.

A part of each second coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the third coil of the U-phase coil 32U is arranged. The other part of each second coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged.

A part of each third coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged. The other part of each third coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the first coil of the U-phase coil 32U is arranged.

<Winding coefficient>
In the present embodiment, the coils arranged at the 1-slot pitch are out of phase by ± 10 ° with respect to the coils arranged at the 2-slot pitch, so that the fundamental wave component (γ =) of the coils arranged at the 1-slot pitch is The distribution winding coefficient kd2 of 1) is calculated by the following equation.
kd1 = cos (10 ° x γ) = 0.985

In the present embodiment, the coils arranged at the 2-slot pitch are the reference for the phase of the induced voltage generated in the 3-phase coil 32, so that the fundamental wave component (γ = 1) of the coils arranged at the 2-slot pitch The distribution winding coefficient kd2 is 1.

Similar to the first embodiment, kp2 = 0.985 and kp1 = 0.766.

Therefore, in the present embodiment, the winding coefficient kw for the fundamental wave component in the motor 1 is obtained by the following equation.
kw = {kp2 × 1 × (1/3)} + {kp1 × kd1 × (2/3)} = 0.831

The ratio of the number of magnetic poles P to the number of slots S is P: S = 2: 3, and the winding coefficient of the stator of the centralized winding is usually 0.866. On the other hand, in the present embodiment, the winding coefficient kw = 0.831.

<Coil connection>
FIG. 43 is a schematic view showing an example of delta connection of the three-phase coil 32 in the fourth embodiment.
FIG. 44 is a diagram showing an example of a three-phase coil 32 connected by a delta connection in the fourth embodiment.
The three-phase coil 32 is connected by, for example, a delta connection. Therefore, as compared with, for example, a star connection, the voltage applied to the three-phase coil 32 can be reduced while maintaining the output of the motor 1. As described in the first embodiment, in the motor 1, the third harmonic component included in the induced voltage generated in each phase can be reduced. Therefore, even when the three-phase coil 32 is connected by the delta connection, the generation of the circulating current in the three-phase coil 32 can be reduced, and as a result, the deterioration of the performance of the motor 1 can be suppressed.

<Manufacturing method of stator 3>
An example of the method for manufacturing the stator 3 described in the fourth embodiment will be described.
FIG. 45 is a flowchart showing an example of the manufacturing process of the stator 3.

FIG. 46 is a diagram showing an insertion step of the second coil in step S41.
In step S41, as shown in FIG. 46, the second coil of each phase is attached to the stator core 31 prepared in advance by the insertion tool 9. Specifically, at the coil end 32a, the second coils of each phase are arranged at equal intervals in the circumferential direction, and the second coils of each phase are arranged in a distributed winding in the outer layer of the slot 311. That is, the second coil of the U-phase coil 32U, the second coil of the V-phase coil 32V, and the second coil of the W-phase coil 32W are arranged in the outer layer of the slot 311 by distributed winding.

In step S42, the insulating member 33 is arranged in the slot 311 so as to insulate the second coil of each phase of the three-phase coil 32. Specifically, in the slot 311 in which the second coil is arranged, the insulating member is arranged inside each second coil in the radial direction. In step S42, for example, the insulating member is arranged in the 12 slots 311.

FIG. 47 is a diagram showing an insertion step of the first coil in step S43.
In step S43, as shown in FIG. 47, the first coil of each phase is attached to the stator core 31 prepared in advance by the insertion tool 9. Specifically, at the coil end 32a, the first coils of each phase are arranged at equal intervals in the circumferential direction, and the first coils of each phase are arranged in a distributed winding in the outer layer and the inner layer of the slot 311.

For example, a part of each first coil of the U-phase coil 32U is arranged in the outer layer of slot 311 in which the third coil of the W-phase coil 32W is arranged. The other part of each first coil of the U-phase coil 32U is arranged in the inner layer of slot 311 in which the second coil of the V-phase coil 32V is arranged. A part of each first coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the third coil of the U-phase coil 32U is arranged. The other part of each first coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged. A part of each first coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the third coil of the V-phase coil 32V is arranged. The other part of each first coil of the W-phase coil 32W is arranged in the inner layer of slot 311 in which the second coil of the U-phase coil 32U is arranged.

In step S44, an insulating member is arranged in the slot 311 so as to insulate the first coil of each phase. Specifically, an insulating member is arranged between each first coil arranged in the outer layer and the third coil arranged in the inner layer of the slot 311 in step S45. In step S44, for example, the insulating member is arranged in the six slots 311.

FIG. 48 is a diagram showing an insertion step of the third coil in step S45.
In step S45, as shown in FIG. 48, the third coil of each phase is attached to the stator core 31 prepared in advance by the insertion tool 9. Specifically, at the coil end 32a, the third coil of each phase is arranged at equal intervals in the circumferential direction, and the third coil of each phase is arranged in a distributed winding in the inner layer of the slot 311 of the stator core 31. .. That is, the third coil of the U-phase coil 32U, the third coil of the V-phase coil 32V, and the third coil of the W-phase coil 32W are arranged in the inner layer of the slot 311 by distributed winding.

For example, a part of each third coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged. The other part of each third coil of the U-phase coil 32U is arranged in the inner layer of slot 311 in which the first coil of the V-phase coil 32V is arranged. A part of each third coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the second coil of the U-phase coil 32U is arranged. The other part of each third coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged. A part of each third coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged. The other part of each third coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the first coil of the U-phase coil 32U is arranged.

In steps S41 to S45, each first coil is arranged in a distributed winding on the stator core 31 at a 1-slot pitch, and each second coil is arranged in a distributed winding on the stator core 31 at a 1-slot pitch. , Each third coil is arranged in a distributed winding around the stator core 31 at a 2-slot pitch. As a result, the three-phase coil 32 is attached to the stator core 31 in a distributed winding so that the three-phase coil 32 has the arrangement described in this embodiment at each coil end 32a and slot 311 of the three-phase coil 32. ..

In step S46, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected to each other. For example, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected by a delta connection. Further, the shape of the connected three-phase coil 32 is adjusted. As a result, the stator 3 shown in FIG. 39 is obtained.

<Advantages of stator 3>
FIG. 49 is a diagram showing a comparison with the winding coefficient of the stator in the comparative example.
In the table shown in FIG. 49, the fundamental wave and each harmonic are components included in the induced voltage generated in each phase.
In FIG. 49, Comparative Example 1 is the motor 1a shown in FIG. Comparative Example 2 is an electric motor including a three-phase coil having 10 magnetic poles formed and attached to the stator core by centralized winding, and a stator core having 15 slots.

Embodiment 5.
FIG. 50 is a top view schematically showing the structure of the motor 1 according to the fifth embodiment.
In the fifth embodiment, the arrangement of the three-phase coil 32 is different from the arrangement described in the fourth embodiment. In the fifth embodiment, a configuration different from that of the fourth embodiment will be described. The configuration not described in the present embodiment can be the same configuration as in the first or fourth embodiment.

<Stator 3>
FIG. 51 is a top view schematically showing the structure of the stator 3 in the fifth embodiment.
FIG. 52 is a diagram schematically showing the arrangement of the coil end 32a and the three-phase coil 32 in the slot 311. In FIG. 52, the dashed line indicates the coil of each phase at the coil end 32a, and the chain line indicates the boundary between the inner layer and the outer layer in each slot 311.

In the examples shown in FIGS. 51 and 52, the stator core 31 has 18 slots 311 as in the fourth embodiment.

FIG. 53 is a diagram schematically showing the structure of the stator 3 as seen from the center of the stator 3 shown in FIG. 51.
FIG. 54 is a diagram schematically showing the structure of the stator 3 as seen from the outside of the stator 3 shown in FIG. 51.
As shown in FIGS. 53 and 54, at each coil end 32a of each phase, the third coil in each coil group is the farthest from the stator core 31.

Therefore, as shown in FIG. 51, the coils of each phase are arranged in the 6 outer layers and the 6 inner layers of the slot 311.

<Arrangement of U-phase coil 32U in slot 311>
The arrangement of the U-phase coil 32U in the slot 311 will be specifically described below.
A part of each first coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the third coil of the W-phase coil 32W is arranged. The other part of each first coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged.

A part of each second coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the third coil of the V-phase coil 32V is arranged. The other part of each second coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged.

A part of each third coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged. The other part of each third coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged.

<Arrangement of V-phase coil 32V in slot 311>
The arrangement of the V-phase coil 32V in the slot 311 will be specifically described below.
A part of each first coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the third coil of the U-phase coil 32U is arranged. The other part of each first coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged.

A part of each third coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the second coil of the U-phase coil 32U is arranged. The other part of each third coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged.

<Arrangement of W-phase coil 32W in slot 311>
The arrangement of the W-phase coil 32W in the slot 311 will be specifically described below.
A part of each first coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the third coil of the V-phase coil 32V is arranged. The other part of each first coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the second coil of the U-phase coil 32U is arranged.

A part of each third coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged. The other part of each third coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the first coil of the U-phase coil 32U is arranged.

<Winding coefficient>
The winding coefficient kw for the fundamental wave component in the motor 1 according to the present embodiment is the same as that in the fourth embodiment.

<Manufacturing method of stator 3>
An example of the method for manufacturing the stator 3 described in the fifth embodiment will be described.
FIG. 55 is a flowchart showing an example of the manufacturing process of the stator 3.

FIG. 56 is a diagram showing an insertion step of the second coil in step S51.
In step S51, as shown in FIG. 56, the second coil of each phase is attached to the stator core 31 prepared in advance by the insertion tool 9. Specifically, at the coil end 32a, the second coils of each phase are arranged at equal intervals in the circumferential direction, and the second coils of each phase are arranged in a distributed winding in the outer layer of the slot 311 of the stator core 31. .. That is, the second coil of the U-phase coil 32U, the second coil of the V-phase coil 32V, and the second coil of the W-phase coil 32W are arranged in the outer layer of the slot 311 by distributed winding.

In step S52, an insulating member is arranged in the slot 311 so as to insulate the second coil of each phase of the three-phase coil 32. Specifically, in the slot 311 in which the second coil is arranged, the insulating member is arranged inside each second coil in the radial direction. In step S42, for example, the insulating member is arranged in the 12 slots 311.

FIG. 57 is a diagram showing an insertion step of the third coil in step S53.
In step S53, as shown in FIG. 57, the third coil of each phase is attached to the stator core 31 prepared in advance by the insertion tool 9. Specifically, at the coil end 32a, the third coils of each phase are arranged at equal intervals in the circumferential direction, and the third coils of each phase are arranged in a distributed winding in the outer layer and the inner layer of the slot 311.

For example, a part of each third coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged. The other part of each third coil of the U-phase coil 32U is arranged in the outer layer of slot 311 in which the first coil of the V-phase coil 32V is arranged. A part of each third coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the second coil of the U-phase coil 32U is arranged. The other part of each third coil of the V-phase coil 32V is arranged in the outer layer of slot 311 in which the first coil of the W-phase coil 32W is arranged. A part of each third coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged. The other part of each third coil of the W-phase coil 32W is arranged in the outer layer of slot 311 in which the first coil of the U-phase coil 32U is arranged.

In step S54, an insulating member is arranged in the slot 311 so as to insulate the third coil of each phase. Specifically, an insulating member is arranged between each third coil arranged in the outer layer and the first coil arranged in the inner layer of the slot 311 in step S55. In step S54, for example, the insulating member is arranged in the six slots 311.

FIG. 58 is a diagram showing an insertion step of the first coil in step S55.
In step S55, as shown in FIG. 58, the first coil of each phase is attached to the stator core 31 prepared in advance by the insertion tool 9. Specifically, at the coil end 32a, the first coils of each phase are arranged at equal intervals in the circumferential direction, and the first coils of each phase are arranged in a distributed winding in the inner layer of the slot 311 of the stator core 31. .. That is, the first coil of the U-phase coil 32U, the first coil of the V-phase coil 32V, and the first coil of the W-phase coil 32W are arranged in the inner layer of the slot 311 by distributed winding.

For example, a part of each first coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the third coil of the W-phase coil 32W is arranged. The other part of each first coil of the U-phase coil 32U is arranged in the inner layer of slot 311 in which the second coil of the V-phase coil 32V is arranged. A part of each first coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the third coil of the U-phase coil 32U is arranged. The other part of each first coil of the V-phase coil 32V is arranged in the inner layer of slot 311 in which the second coil of the W-phase coil 32W is arranged. A part of each first coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the third coil of the V-phase coil 32V is arranged. The other part of each first coil of the W-phase coil 32W is arranged in the inner layer of slot 311 in which the second coil of the U-phase coil 32U is arranged.

In steps S51 to S55, each first coil is arranged in a distributed winding on the stator core 31 at a 1-slot pitch, and each second coil is arranged in a distributed winding on the stator core 31 at a 1-slot pitch. , Each third coil is arranged in a distributed winding around the stator core 31 at a 2-slot pitch. As a result, the three-phase coil 32 is attached to the stator core 31 in a distributed winding so that the three-phase coil 32 has the arrangement described in this embodiment at each coil end 32a and slot 311 of the three-phase coil 32. ..

In step S56, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected to each other. For example, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected by a delta connection. Further, the shape of the connected three-phase coil 32 is adjusted. As a result, the stator 3 shown in FIG. 41 is obtained.

<Advantages of stator 3>
The stator 3 in the present embodiment has the advantages described in the fourth embodiment.

Further, at each coil end 32a, a third coil is arranged on the first coil and the second coil. In other words, at each coil end 32a, a third coil is arranged outside the first coil and the second coil in the axial direction. That is, at each coil end 32a, the first coil and the second coil are arranged between the third coil and the stator core 31. Therefore, the size of the coil end 32a in the axial direction can be suppressed.

Further, the method for manufacturing the stator 3 in the present embodiment has the advantages described in the fourth embodiment.

Further, in the method for manufacturing the stator 3 in the present embodiment, a third coil is arranged on the first coil and the second coil at each coil end 32a. In other words, at each coil end 32a, a third coil is arranged outside the first coil and the second coil in the axial direction. Each second coil is located on the outer layer of slot 311. Therefore, the first coil can be easily attached to the stator core 31. In other words, when the first coil is attached to the stator core 31, the other coils do not interfere with the attachment of the first coil.

Modification example.
FIG. 59 is a diagram showing another example of the stator core 31 according to the fifth embodiment. The arrangement of the three-phase coil 32 shown in FIG. 59 is the same as the arrangement of the three-phase coil 32 shown in FIG.
The stator 3 may have a stator core 31c instead of the stator core 31. The stator core 31c is divided into a plurality of divided cores 31d. That is, the stator core 31c is composed of a plurality of divided cores 31d. Each split core 31d has at least one slot 311. The stator core 31c shown in FIG. 59 can also be applied to the stator core 31 in the fourth embodiment and the stator core 31 in the sixth embodiment described later.

The stator core 31c has a slot 311 (for example, a first slot) in which each first coil (specifically, a part of the first coil) is arranged and the same phase adjacent to the first coil. The second coil (specifically, a part of the second coil) is divided into a plurality of division cores 31d in the region between the second coil and the slot 311 (for example, the second slot) in which the second coil is arranged. For example, the stator core 31c is divided into a plurality of division cores 31d in the region between each first coil U1 and the slot 311 in which the second coil U2 adjacent to the first coil U1 is arranged. There is. In the example shown in FIG. 34, the stator core 31c is divided into six dividing cores 31d. A coil having a different phase from each other is attached to each of the divided cores 31d. Specifically, two coils arranged at a one-slot pitch and one coil arranged at a two-slot pitch are attached to each of the divided cores 31d.

60 to 62 are diagrams schematically showing a manufacturing process of the stator core 31c shown in FIG. 59. In FIGS. 60 to 62, a part of the stator core 31c is shown.
As shown in FIG. 60, a plurality of split cores 31d are arranged in a straight line. A first coil, a second coil, and a third coil connected in series for each coil group of each phase are simultaneously arranged in slot 311. The first coil, the second coil, and the third coil of each coil group of each phase are connected by, for example, a string.

FIG. 60 shows an example in which the first coil W1, the second coil W2, and the third coil W3 of the W-phase coils 32W are arranged. FIG. 61 shows an example in which the first coil V1, the second coil V2, and the third coil V3 of the V-phase coils 32V are arranged. FIG. 62 shows an example in which the first coil U1, the second coil U2, and the third coil U3 of the U-phase coils 32U are arranged.

After attaching the three-phase coils 32 to the split cores 31d, these split cores 31d are arranged in an annular core such that the stator 3 has the arrangement of the three-phase coils 32 shown in FIG. 59. The U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W connect to each other. For example, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected by a delta connection. Further, the shape of the connected three-phase coil 32 is adjusted. As a result, the stator 3 shown in FIG. 59 is obtained. In the manufacturing process of the stator core 31c shown in FIG. 59, since the first coil, the second coil, and the third coil connected in series are attached to the split core 31d, the three-phase coil 32 is attached to the stator core 31d. After mounting on 31c, the step of connecting the first coil, the second coil, and the third coil in series can be reduced.

Embodiment 6.
FIG. 63 is a top view schematically showing the structure of the motor 1 according to the sixth embodiment.
In the sixth embodiment, the arrangement of the three-phase coil 32 is different from the arrangement described in the fourth embodiment. In the sixth embodiment, a configuration different from that of the fourth embodiment will be described. The configuration not described in the present embodiment can be the same configuration as in the first or fourth embodiment.

<Stator 3>
FIG. 64 is a top view schematically showing the structure of the stator 3 in the sixth embodiment.
FIG. 65 is a diagram schematically showing the arrangement of the coil end 32a and the three-phase coil 32 in the slot 311. In FIG. 65, the dashed line indicates the coil of each phase at the coil end 32a, and the chain line indicates the boundary between the inner layer and the outer layer in each slot 311.

In the examples shown in FIGS. 64 and 65, the stator core 31 has 18 slots 311 as in the fourth embodiment.

<Coil arrangement at coil end 32a>
In the present embodiment, at the coil end 32a of each coil group, the first coil is arranged in the inner region, the second coil is arranged from the inner region to the outer region, and the third coil is arranged on the outer region. It is located in the area.

FIG. 66 is a diagram schematically showing the structure of the stator 3 as seen from the center of the stator 3 shown in FIG. 64.
FIG. 67 is a diagram schematically showing the structure of the stator 3 as seen from the outside of the stator 3 shown in FIG. 64.
As shown in FIGS. 66 and 67, at each coil end 32a of each phase, the third coil in each coil group is the farthest from the stator core 31.

Therefore, as shown in FIG. 64, the coils of each phase are arranged in the 6 outer layers and the 6 inner layers of the slot 311.

A part of each second coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the third coil of the V-phase coil 32V is arranged. The other part of each second coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged.

A part of each third coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the second coil of the W-phase coil 32W is arranged. The other part of each third coil of the U-phase coil 32U is arranged in the outer layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged.

A part of each second coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the third coil of the W-phase coil 32W is arranged. The other part of each second coil of the V-phase coil 32V is arranged in the outer layer of slot 311 in which the first coil of the U-phase coil 32U is arranged.

A part of each third coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the second coil of the U-phase coil 32U is arranged. The other part of each third coil of the V-phase coil 32V is arranged in the outer layer of the slot 311 in which the first coil of the W-phase coil 32W is arranged.

A part of each second coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the third coil of the U-phase coil 32U is arranged. The other part of each second coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the first coil of the V-phase coil 32V is arranged.

A part of each third coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the second coil of the V-phase coil 32V is arranged. The other part of each third coil of the W-phase coil 32W is arranged in the outer layer of the slot 311 in which the first coil of the U-phase coil 32U is arranged.

<Manufacturing method of stator 3>
An example of the method for manufacturing the stator 3 described in the sixth embodiment will be described.
FIG. 68 is a flowchart showing an example of the manufacturing process of the stator 3.

FIG. 69 is a diagram showing an insertion step of the third coil in step S61.
In step S61, as shown in FIG. 69, the third coil of each phase is attached to the stator core 31 prepared in advance by the insertion tool 9. Specifically, at the coil end 32a, the third coil of each phase is arranged at equal intervals in the circumferential direction, and the third coil of each phase is arranged in a distributed winding in the outer layer of the slot 311 of the stator core 31. .. That is, the third coil of the U-phase coil 32U, the third coil of the V-phase coil 32V, and the third coil of the W-phase coil 32W are arranged in the outer layer of the slot 311 by distributed winding.

In step S62, an insulating member is arranged in the slot 311 so as to insulate the third coil of each phase of the three-phase coil 32. Specifically, in the slot 311 in which the third coil is arranged, the insulating member is arranged inside each third coil in the radial direction. In step S42, for example, the insulating member is arranged in the 12 slots 311.

FIG. 70 is a diagram showing an insertion step of the second coil in step S63.
In step S63, as shown in FIG. 70, the second coil of each phase is attached to the stator core 31 prepared in advance by the insertion tool 9. Specifically, at the coil end 32a, the second coils of each phase are arranged at equal intervals in the circumferential direction, and the second coils of each phase are arranged in a distributed winding in the outer layer and the inner layer of the slot 311.

For example, a part of each second coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the third coil of the V-phase coil 32V is arranged. The other part of each second coil of the U-phase coil 32U is arranged in the outer layer of slot 311 in which the first coil of the W-phase coil 32W is arranged. A part of each second coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the third coil of the W-phase coil 32W is arranged. The other part of each second coil of the V-phase coil 32V is arranged in the outer layer of slot 311 in which the first coil of the U-phase coil 32U is arranged. A part of each second coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the third coil of the U-phase coil 32U is arranged. The other part of each second coil of the W-phase coil 32W is arranged in the outer layer of slot 311 in which the first coil of the V-phase coil 32V is arranged.

In step S64, an insulating member is arranged in the slot 311 so as to insulate the second coil of each phase. Specifically, an insulating member is arranged between each second coil arranged in the outer layer and the first coil arranged in the inner layer of the slot 311 in step S65. In step S64, for example, the insulating member is arranged in the six slots 311.

FIG. 71 is a diagram showing an insertion step of the first coil in step S65.
In step S65, as shown in FIG. 71, the first coil of each phase is attached to the stator core 31 prepared in advance by the insertion tool 9. Specifically, at the coil end 32a, the first coils of each phase are arranged at equal intervals in the circumferential direction, and the first coils of each phase are arranged in a distributed winding in the inner layer of the slot 311 of the stator core 31. .. That is, the first coil of the U-phase coil 32U, the first coil of the V-phase coil 32V, and the first coil of the W-phase coil 32W are arranged in the inner layer of the slot 311 by distributed winding.

For example, the arrangement of the U-phase coil 32U in the slot 311 will be specifically described below.
A part of each first coil of the U-phase coil 32U is arranged in the inner layer of the slot 311 in which the third coil of the W-phase coil 32W is arranged. The other part of each first coil of the U-phase coil 32U is arranged in the inner layer of slot 311 in which the second coil of the V-phase coil 32V is arranged. A part of each first coil of the V-phase coil 32V is arranged in the inner layer of the slot 311 in which the third coil of the U-phase coil 32U is arranged. The other part of each first coil of the V-phase coil 32V is arranged in the inner layer of slot 311 in which the second coil of the W-phase coil 32W is arranged. A part of each first coil of the W-phase coil 32W is arranged in the inner layer of the slot 311 in which the third coil of the V-phase coil 32V is arranged. The other part of each first coil of the W-phase coil 32W is arranged in the inner layer of slot 311 in which the second coil of the U-phase coil 32U is arranged.

In steps S61 to S65, each first coil is arranged in a distributed winding on the stator core 31 at a 1-slot pitch, and each second coil is arranged in a distributed winding on the stator core 31 at a 1-slot pitch. , Each third coil is arranged in a distributed winding around the stator core 31 at a 2-slot pitch. As a result, the three-phase coil 32 is attached to the stator core 31 in a distributed winding so that the three-phase coil 32 has the arrangement described in this embodiment at each coil end 32a and slot 311 of the three-phase coil 32. ..

In step S66, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected to each other. For example, the U-phase coil 32U, the V-phase coil 32V, and the W-phase coil 32W are connected by a delta connection. Further, the shape of the connected three-phase coil 32 is adjusted. As a result, the stator 3 shown in FIG. 64 is obtained.

Further, in the method for manufacturing the stator 3 in the present embodiment, a third coil is arranged on the first coil and the second coil at each coil end 32a. In other words, at each coil end 32a, a third coil is arranged outside the first coil and the second coil in the axial direction. Each third coil is located on the outer layer of slot 311. Therefore, the first coil can be easily attached to the stator core 31. In other words, when the first coil is attached to the stator core 31, the other coils do not interfere with the attachment of the first coil.

Embodiment 7.
The compressor 300 according to the seventh embodiment will be described.
FIG. 72 is a cross-sectional view schematically showing the structure of the compressor 300.

The compressor 300 has an electric motor 1 as an electric element, a closed container 307 as a housing, and a compression mechanism 305 as a compression element (also referred to as a compression device). In this embodiment, the compressor 300 is a scroll compressor. However, the compressor 300 is not limited to the scroll compressor. The compressor 300 may be a compressor other than the scroll compressor, for example, a rotary compressor.

The electric motor 1 in the compressor 300 is the electric motor 1 described in one of the first to eighth embodiments. The electric motor 1 drives the compression mechanism 305.

The compressor 300 further includes a subframe 308 that supports the lower end of the shaft 4 (that is, the end opposite to the compression mechanism 305 side).

The compression mechanism 305 is arranged in the closed container 307. The compression mechanism 305 includes a fixed scroll 301 having a spiral portion, a swing scroll 302 having a spiral portion forming a compression chamber between the spiral portion of the fixed scroll 301, and a compliance frame 303 holding the upper end portion of the shaft 4. And a guide frame 304 which is fixed to the closed container 307 and holds the compliance frame 303.

A suction pipe 310 penetrating the closed container 307 is press-fitted into the fixed scroll 301. Further, the closed container 307 is provided with a discharge pipe 306 for discharging the high-pressure refrigerant gas discharged from the fixed scroll 301 to the outside. The discharge pipe 306 communicates with an opening provided between the compression mechanism 305 of the closed container 307 and the electric motor 1.

The motor 1 is fixed to the closed container 307 by fitting the stator 3 into the closed container 307. The configuration of the motor 1 is as described above. A glass terminal 309 that supplies electric power to the motor 1 is fixed to the closed container 307 by welding.

When the motor 1 rotates, the rotation is transmitted to the swing scroll 302, and the swing scroll 302 swings. When the swing scroll 302 swings, the volume of the compression chamber formed by the spiral portion of the swing scroll 302 and the spiral portion of the fixed scroll 301 changes. Then, the refrigerant gas is sucked from the suction pipe 310, compressed, and discharged from the discharge pipe 306.

Since the compressor 300 has the motor 1 described in one of the first to sixth embodiments, it has the advantages described in the corresponding embodiment.

Further, since the compressor 300 has the electric motor 1 described in one of the first to sixth embodiments, the performance of the compressor 300 can be improved.

Embodiment 8.
The refrigerating and air-conditioning apparatus 7 as an air conditioner having the compressor 300 according to the seventh embodiment will be described.
FIG. 73 is a diagram schematically showing the configuration of the refrigerating and air-conditioning apparatus 7 according to the eighth embodiment.

The refrigerating and air-conditioning device 7 can be operated for heating and cooling, for example. The refrigerant circuit diagram shown in FIG. 73 is an example of a refrigerant circuit diagram of an air conditioner capable of cooling operation.

The refrigerating and air-conditioning device 7 according to the eighth embodiment has an outdoor unit 71, an indoor unit 72, and a refrigerant pipe 73 connecting the outdoor unit 71 and the indoor unit 72.

The outdoor unit 71 includes a compressor 300, a condenser 74 as a heat exchanger, a throttle device 75, and an outdoor blower 76 (first blower). The condenser 74 condenses the refrigerant compressed by the compressor 300. The drawing device 75 decompresses the refrigerant condensed by the condenser 74 and adjusts the flow rate of the refrigerant. The diaphragm device 75 is also referred to as a decompression device.

The indoor unit 72 has an evaporator 77 as a heat exchanger and an indoor blower 78 (second blower). The evaporator 77 evaporates the refrigerant decompressed by the throttle device 75 to cool the indoor air.

The basic operation of the cooling operation in the refrigerating and air-conditioning device 7 will be described below. In the cooling operation, the refrigerant is compressed by the compressor 300 and flows into the condenser 74. The refrigerant is condensed by the condenser 74, and the condensed refrigerant flows into the drawing device 75. The refrigerant is decompressed by the throttle device 75, and the decompressed refrigerant flows into the evaporator 77. The refrigerant evaporates in the evaporator 77, and the refrigerant (specifically, the refrigerant gas) flows into the compressor 300 of the outdoor unit 71 again. Similarly, when air is sent to the condenser 74 by the outdoor blower 76, heat is transferred between the refrigerant and air, and similarly, when air is sent to the evaporator 77 by the indoor blower 78, heat is transferred between the refrigerant and air. Moving.

The configuration and operation of the refrigerating and air-conditioning device 7 described above is an example, and is not limited to the above-mentioned example.

According to the refrigerating and air-conditioning apparatus 7 according to the eighth embodiment, since the motor 1 described in one of the first to sixth embodiments is provided, it has the advantages described in the corresponding embodiment.

Further, since the refrigerating and air-conditioning apparatus 7 according to the eighth embodiment has the compressor 300 according to the seventh embodiment, the performance of the refrigerating and air-conditioning apparatus 7 can be improved.

The features in each embodiment and the features in each modification described above can be appropriately combined with each other.

1 motor, 2 rotor, 3 stator, 7 refrigeration air conditioner, 31 stator core, 32 3-phase coil, 32a coil end, 32U U-phase coil, 32V V-phase coil, 32W W-phase coil, 71 outdoor unit, 72 Indoor unit, 300 compressor, 305 compression mechanism, 307 closed container, 311 slot, 74 condenser, 77 evaporator.

Claims

Stator iron core and
It is equipped with a three-phase coil attached to the stator core by distributed winding.
The stator core has 18 × n slots (n is an integer of 1 or more).
Each of the 18 × n slots is provided in an inner layer in which one of the three-phase coils is arranged and outside the inner layer in the radial direction, and one coil of the three-phase coils is provided. Including the outer layer on which
The three-phase coil has 6 × n U-phase coils, 6 × n V-phase coils, and 6 × n W-phase coils at the coil ends of the three-phase coils, and has 10 × n U-phase coils. Form a magnetic pole,
Each of the 6 × n U-phase coils, the 6 × n V-phase coils, and the 6 × n W-phase coils is a 2 × n set in which the first to third coils are a set. Including the coil group of
At the coil end, the first to third coils are arranged in this order in the circumferential direction.
A part of the first coil is arranged in the first slot of the 18 × n slots together with a part of the second coil.
At the coil end, the third coil is adjacent to the second coil with one of the 18 × n slots in between.
The first coil is arranged on the stator core at a 2-slot pitch.
The second coil is arranged on the stator core at a 2-slot pitch.
The third coil is a stator arranged on the stator core at a pitch of one slot.
The stator according to claim 1, wherein the third coil arranged at a pitch of one slot is arranged in the inner layer of the second slot of the 18 × n slots.
The first coil arranged at a two-slot pitch is arranged in the outer layer of the first slot, and the second coil arranged at a two-slot pitch is of the 18 × n slots. The stator according to claim 1 or 2, which is arranged in the outer layer of the third slot and the inner layer of the first slot.
The third coil arranged at a pitch of one slot is placed in the outer layer of the second slot of the 18 × n slots and the inner layer of the third slot of the 18 × n slots. The stator according to claim 1, which is arranged.
The first coil arranged at a two-slot pitch is arranged in the inner layer of the first slot, and the second coil arranged at a two-slot pitch is the outer layer of the first slot. The stator according to claim 1 or 4, which is arranged in.
The third coil arranged at a pitch of one slot is placed in the outer layer of the second slot of the 18 × n slots and the outer layer of the third slot of the 18 × n slots. The stator according to claim 1, which is arranged.
The first coil arranged at a two-slot pitch is arranged in the inner layer of the first slot, and the second coil arranged at a two-slot pitch is of the 18 × n slots. The stator according to claim 1 or 4, which is arranged in the outer layer of the second slot and in the inner layer of the third slot of the 18 × n slots.
The stator core is divided into a plurality of divided cores in the first slot in which the part of the first coil and the part of the second coil are arranged. The stator according to any one item.
Stator iron core and
It is equipped with a three-phase coil attached to the stator core by distributed winding.
The stator core has 18 × n slots (n is an integer of 1 or more).
Each of the 18 × n slots is provided in an inner layer in which one of the three-phase coils is arranged and outside the inner layer in the radial direction, and one coil of the three-phase coils is provided. Including the outer layer on which
The three-phase coil has 6 × n U-phase coils, 6 × n V-phase coils, and 6 × n W-phase coils at the coil ends of the three-phase coils, and has 10 × n U-phase coils. Form a magnetic pole,
Each of the 6 × n U-phase coils, the 6 × n V-phase coils, and the 6 × n W-phase coils is a 2 × n set in which the first to third coils are a set. Including the coil group of
At the coil end, the first to third coils are arranged in this order in the circumferential direction.
A part of the second coil is a second of the 18 × n slots adjacent to the first slot of the 18 × n slots in which a part of the first coil is arranged. Located in 2 slots,
At the coil end, the third coil is adjacent to the second coil with one of the 18 × n slots in between.
The first coil is arranged on the stator core at a pitch of one slot.
The second coil is arranged on the stator core at a pitch of one slot.
The third coil is a stator arranged on the stator core at a 2-slot pitch.
The first coil arranged at a pitch of one slot is arranged in the outer layer of the first slot and the inner layer of the third slot of the 18 × n slots, and has a pitch of one slot. The stator according to claim 9, wherein the arranged second coil is arranged in the outer layer of the second slot and in the outer layer of the fourth slot of the 18 × n slots.
The third coil arranged at a two-slot pitch is placed in the inner layer of the fifth slot of the 18 × n slots and the inner layer of the sixth slot of the 18 × n slots. The stator according to claim 9 or 10, which is arranged.
The first coil arranged at a pitch of one slot is arranged in the inner layer of the first slot and the inner layer of the third slot of the 18 × n slots, and has a pitch of one slot. The stator according to claim 9, wherein the arranged second coil is arranged in the outer layer of the second slot and in the outer layer of the fourth slot of the 18 × n slots.
The third coil arranged at a two-slot pitch is placed in the outer layer of the fifth slot of the 18 × n slots and the inner layer of the sixth slot of the 18 × n slots. The stator according to claim 9 or 12, which is arranged.
The stator according to any one of claims 9 to 13, wherein the stator core is divided into a plurality of divided cores in an area between the first slot and the second slot.
The first coil arranged at a pitch of one slot is arranged in the inner layer of the first slot and the inner layer of the third slot of the 18 × n slots, and has a pitch of one slot. The stator according to claim 9, wherein the arranged second coil is arranged in the inner layer of the second slot and the outer layer of the fourth slot of the 18 × n slots.
The third coil arranged at a two-slot pitch is placed in the outer layer of the fifth slot of the 18 × n slots and the outer layer of the sixth slot of the 18 × n slots. The stator according to claim 9 or 15, which is arranged.
The stator according to any one of claims 1 to 16, wherein the three-phase coil is connected by a delta connection.
The stator according to any one of claims 1 to 17, and the stator.
An electric motor including a rotor arranged inside the stator.
With a closed container
With the compression device arranged in the closed container,
A compressor including the motor according to claim 18, which drives the compressor.
The compressor according to claim 19 and
An air conditioner equipped with a heat exchanger.
A method for manufacturing a stator having a stator core having 18 × n slots (n is an integer of 1 or more) and a three-phase coil attached to the stator core.
Each of the 18 × n slots is provided in an inner layer in which one of the three-phase coils is arranged and outside the inner layer in the radial direction, and one coil of the three-phase coils is provided. Including the outer layer on which
The three-phase coil has 6 × n U-phase coils, 6 × n V-phase coils, and 6 × n W-phase coils at the coil ends of the three-phase coils, and has 10 × n U-phase coils. Form a magnetic pole,
Each of the 6 × n U-phase coils, the 6 × n V-phase coils, and the 6 × n W-phase coils is a 2 × n set in which the first to third coils are a set. Including the coil group of
The first coil is arranged in a distributed winding around the stator core at a 2-slot pitch, and
The second coil is arranged in a distributed winding around the stator core at a pitch of 2 slots.
A method for manufacturing a stator, which comprises arranging the third coil on the stator core in a distributed winding manner at a pitch of one slot.
A method for manufacturing a stator having a stator core having 18 × n slots (n is an integer of 1 or more) and a three-phase coil attached to the stator core.
Each of the 18 × n slots is provided in an inner layer in which one of the three-phase coils is arranged and outside the inner layer in the radial direction, and one coil of the three-phase coils is provided. Including the outer layer on which
The three-phase coil has 6 × n U-phase coils, 6 × n V-phase coils, and 6 × n W-phase coils at the coil ends of the three-phase coils, and has 10 × n U-phase coils. Form a magnetic pole,
Each of the 6 × n U-phase coils, the 6 × n V-phase coils, and the 6 × n W-phase coils is a 2 × n set in which the first to third coils are a set. Including the coil group of
The first coil is arranged in a distributed winding around the stator core at a pitch of one slot.
The second coil is arranged in a distributed winding around the stator core at a pitch of one slot.
A method for manufacturing a stator, which comprises arranging the third coil on the stator core in a distributed winding manner at a pitch of 2 slots.