Stator and motor

Abstract

To provide a stator capable of suppressing imbalance while increasing the occupancy ratio.SOLUTION: A stator 20 includes a plurality of teeth 21b arranged in the circumferential direction and extending in the radial direction and windings 23 wound around the teeth in a concentrated winding. The windings have a plurality of first system windings 41 to which three-phase alternating currents of a first system are supplied and a plurality of second system windings 42 to which three-phase alternating currents of a second system are supplied. The first and second system windings are arranged alternately in the circumferential direction. The first system windings are wound around the teeth in a first arrangement. The second system windings are wound around the teeth in a second arrangement different from the first arrangement, avoiding the first system windings between adjacent teeth.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a stator and a motor.

Background Art

[0002] Conventionally, as a stator of a motor, there is one including a plurality of teeth arranged in the circumferential direction and extending radially inward, and windings wound around the teeth by concentrated winding. And, as such a stator, there is one in which the occupation ratio of the windings between adjacent teeth is increased by arranging the windings wound around adjacent teeth in different arrays (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the stator as described above, there is a problem that an imbalance occurs due to different arrangements of adjacent windings. This causes, for example, noise. Also, for example, it causes a need for complicated control to mitigate the imbalance.

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide a stator and a motor capable of suppressing imbalance while increasing the occupation ratio.

Means for Solving the Problems

[0006] The stator (20) for solving the above problems includes a plurality of teeth (21b) arranged in the circumferential direction and extending in the radial direction, and windings (23) wound around the teeth in concentrated winding. The windings have a plurality of first-system windings (41) to which a first-system current is supplied and a plurality of second-system windings (42) to which a second-system current is supplied. The first-system windings and the second-system windings are alternately arranged in the circumferential direction. The first-system windings are wound around the teeth in a first arrangement, and the second-system windings are wound around the teeth in a second arrangement different from the first arrangement while avoiding the first-system windings between adjacent teeth.

[0007] According to this configuration, since the second-system windings are wound around the teeth in a second arrangement different from the first arrangement while avoiding the first-system windings between adjacent teeth, the occupancy rate between the teeth can be increased. That is, by winding the second-system windings in a second arrangement that fills the remaining region between the teeth where the first-system windings are arranged, the occupancy rate between the teeth can be increased compared to the case where all are wound in the same arrangement. And the first-system windings are supplied with the first-system current, and the second-system windings are supplied with the second-system current, and since the arrangement is the same within each system, there is no imbalance due to different arrangements within each system. Therefore, for example, noise due to imbalance can be suppressed. Also, for example, complicated control for relaxing the imbalance becomes unnecessary.

[0008] The motor (10) for solving the above problems includes the stator and a rotor (30) arranged to face the tips of the teeth and rotatably supported. According to this configuration, the above effects can be obtained in the motor.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0010] Hereinafter, an embodiment of a motor including a stator will be described with reference to the drawings. In the drawings, for convenience of explanation, a part of the configuration may be shown in an exaggerated or simplified manner. Also, the dimensional ratios of each part may be different from the actual ones.

[0011] (Configuration of Motor 10) As shown in FIG. 1, the motor 10 includes a stator 20 and a rotor 30. The motor 10 also includes a first inverter circuit (not shown) and a second inverter circuit that can each independently generate three-phase alternating current with a 120-degree phase difference. For example, the first inverter circuit can generate a first system of three-phase alternating current of the X phase, Y phase, and Z phase. The second inverter circuit can generate a second system of three-phase alternating current of the U phase, V phase, and W phase.

[0012] (Configuration of Stator 20) As shown in FIG. 2, the stator 20 includes a stator core 21, an insulator 22, and a winding 23. In FIGS. 1 and 2, the cross-sections of the insulator 22 and the winding 23 are schematically shown. The stator core 21 is composed of a plurality of divided cores 24 divided in the circumferential direction. In this embodiment, the stator core 21 is composed of 12 divided cores 24. The stator core 21 has an annular portion 21a in an annular shape and teeth 21b extending radially inward from the annular portion 21a. The teeth 21b are provided for each divided core 24. The insulator 22 is mounted so as to cover the teeth 21b. The winding 23 is wound around the teeth 21b in a concentrated winding manner via the insulator 22.

[0013] (Detailed Configuration of Winding 23) The winding 23 has a plurality of first-system windings 41 to which three-phase alternating currents of the first system of the X-phase, Y-phase, and Z-phase are supplied, and a plurality of second-system windings 42 to which three-phase alternating currents of the second system of the U-phase, V-phase, and W-phase are supplied. The first-system windings 41 and the second-system windings 42 are alternately arranged in the circumferential direction. That is, the winding 23 has six first-system windings 41 of X+, X-, Y+, Y-, Z+, and Z-. Further, the winding 23 has six second-system windings 42 of U+, U-, V+, V-, W+, and W-. Note that + and - represent forward winding and reverse winding, respectively.

[0014] And, for example, as shown in FIG. 1, in the winding 23, the first-system windings 41 and the second-system windings 42 are alternately arranged in the circumferential direction in the order of Z+, W-, Y-, V+, X+, U-, Z-, W+, Y+, V-, X-, and U+.

[0015] As shown in FIG. 2, the first-system winding 41 is wound around the teeth 21b in a first arrangement, and the second-system winding 42 is wound around the teeth 21b in a second arrangement different from the first arrangement while avoiding the first-system winding 41 between adjacent teeth 21b in the circumferential direction. Also, a first neutral line 41a, which is one terminal line of the first-system winding 41, and a second neutral line 42a, which is one terminal line of the second-system winding 42, are drawn out from different positions in the radial direction. In the present embodiment, the first neutral line 41a is drawn out from the inner side in the radial direction, and the second neutral line 42a is drawn out from the outer side in the radial direction. Also, a first power line 41b, which is the other terminal line of the first-system winding 41, and a second power line 42b, which is the other terminal line of the second-system winding 42, are drawn out from the same position in the radial direction. In the present embodiment, both the first power line 41b and the second power line 42b are drawn out from the outer side in the radial direction. The first power line 41b is connected to a first inverter circuit (not shown), and the second power line 42b is connected to a second inverter circuit (not shown).

[0016] The first-system windings 41 and the second-system windings 42 are wound sequentially along the radial direction and are wound back inside and outside in the radial direction and then wound sequentially, so that they are wound in a plurality of rows in the circumferential direction.

[0017] Specifically, the first-system winding 41 is wound from a portion on the radially outer side that becomes the first power line 41b. Then, the first-system winding 41 is sequentially wound along the radially inner side, folded back on the radially inner side and sequentially wound along the radially outer side, and further folded back on the radially outer side and sequentially wound along the radially inner side. As a result, the first-system winding 41 is wound in three rows in the circumferential direction. Note that the first-system winding 41 has the same number of turns for each row, and in this embodiment, it is wound 8 times for each row. Also, the first-system winding 41 is wound so as to cross the center line between adjacent teeth 21b in the circumferential direction on the radially inner side. Further, since the end of the winding of the first-system winding 41 is on the radially inner side, the first neutral line 41a is drawn out from the radially inner side.

[0018] Also, the second-system winding 42 is wound from a portion on the radially outer side that becomes the second power line 42b. The second-system winding 42 is sequentially wound along the radially inner side, folded back on the radially inner side and sequentially wound along the radially outer side, further folded back on the radially outer side and sequentially wound along the radially inner side, and further folded back at the radially intermediate portion and sequentially wound along the radially outer side. As a result, the second-system winding 42 is wound in four rows in the circumferential direction. Note that for the second-system winding 42, the first and second rows are wound 8 times, the third row is wound 6 times, and the fourth row is wound 2 times. Also, the total number of turns of the first-system winding 41 and the second-system winding 42 is the same, and in this embodiment, both are wound 24 times. Further, since the end of the winding of the second-system winding 42 is on the radially outer side, the second neutral line 42a is drawn out from the radially outer side.

[0019] Also, the stator 20 includes a first neutral point terminal 50 and a second neutral point terminal 60. (Configuration of the First Neutral Point Terminal 50 and the Second Neutral Point Terminal 60) The first neutral point terminal 50 and the second neutral point terminal 60 are formed in a circular shape by a conductive metal material. The first neutral point terminal 50 and the second neutral point terminal 60 of this embodiment are formed in a perfect circular shape.

[0020] As shown in FIGS. 1 and 2, the first neutral terminal 50 and the second neutral terminal 60 have different diameters. Specifically, the first neutral terminal 50 is formed in a circular shape with a small diameter, and the second neutral terminal 60 is formed in a circular shape with a larger diameter than the first neutral terminal 50.

[0021] Also, as shown in FIG. 3, the first neutral terminal 50 and the second neutral terminal 60 are arranged at the same axial position. Note that the first neutral terminal 50 and the second neutral terminal 60 of the present embodiment have connecting portions 50a and 60a that rise axially from a disk shape.

[0022] All the first neutral lines 41a are connected to the connecting portion 50a of the first neutral terminal 50. Also, all the second neutral lines 42a are connected to the connecting portion 60a of the second neutral terminal 60. Note that in FIG. 3, the state where the first neutral line 41a is connected to the first neutral terminal 50 and the state where the second neutral line 42a is connected to the second neutral terminal 60 are schematically illustrated. The first neutral terminal 50 is formed with a diameter corresponding to the position where the first neutral line 41a is drawn out, and the first neutral line 41a is connected to the first neutral terminal 50 extending axially and being substantially not bent. Also, the second neutral terminal 60 is formed with a diameter corresponding to the position where the second neutral line 42a is drawn out, and the second neutral line 42a is connected to the first neutral terminal 50 extending axially and being substantially not bent.

[0023] Also, as shown in FIG. 3, the stator 20 has a mold resin 70. The mold resin 70 molds the winding 23, the first neutral terminal 50, the second neutral terminal 60, etc. Note that FIG. 3 is a schematic diagram, and for example, the illustration of the first power line 41b, the second power line 42b, etc. when wound circumferentially is omitted.

[0024] (Configuration of the rotor 30) As shown in FIG. 1, the rotor 30 is disposed radially inside the stator 20 so as to face the tip of the tooth 21b and is rotatably supported. The rotor 30 has a plurality of permanent magnets (not shown) in the circumferential direction.

[0025] Next, the operation of the motor 10 configured as described above will be described. The motor 10 includes a first inverter circuit and a second inverter circuit. Further, the winding 23 of the stator 20 has a plurality of first-system windings 41 to which a first-system three-phase alternating current from the first inverter circuit is supplied and a plurality of second-system windings 42 to which a second-system three-phase alternating current from the second inverter circuit is supplied. Therefore, the motor 10 can be driven by at least one of the first-system windings 41 and the second-system windings 42 and has redundancy.

[0026] Next, the effects of the above embodiment will be described below. (1) Since the second system winding 42 is wound around the teeth 21b in a second arrangement different from the first arrangement while avoiding the first system winding 41 between adjacent teeth 21b, the occupancy rate between the teeth 21b can be increased. That is, by winding the second system winding 42 in a second arrangement that fills the remaining area between the teeth 21b where the first system winding 41 is arranged, the occupancy rate between the teeth 21b can be increased compared to the case where all are wound in the same arrangement. Specifically, in the present embodiment, the first system winding 41 is wound so as to cross the center line between adjacent teeth 21b in the circumferential direction beyond the radially inner side. Therefore, even if an attempt is made to wind and arrange the second system winding 42 in the same first arrangement as the first system winding 41, it becomes impossible because the second system winding 42 overlaps the first system winding 41 on the radially inner side. By avoiding this, the occupancy rate can be increased. And the first system winding 41 is supplied with the three-phase alternating current of the first system, and the second system winding 42 is supplied with the three-phase alternating current of the second system. Since the arrangements are the same within each system, no imbalance occurs due to different arrangements within each system. Therefore, for example, noise due to imbalance can be suppressed. Also, for example, complicated control for alleviating the imbalance becomes unnecessary.

[0027] (2) The first neutral line 41a, which is one terminal line of the first system winding 41, and the second neutral line 42a, which is one terminal line of the second system winding 42, are drawn out from different positions in the radial direction. Therefore, each connection becomes easier compared to the case where they are drawn out from the same position in the radial direction. That is, since the drawing positions of the first neutral line 41a and the second neutral line 42a are dispersed in the radial direction, concentration can be avoided and each connection becomes easier.

[0028] (3) Since it includes a circular first neutral point terminal 50 and a second neutral point terminal 60 that is circular and has a different diameter from the first neutral point terminal 50, the first neutral line 41a and the second neutral line 42a can be respectively connected with a simple configuration.

[0029] (4) Since the first neutral terminal 50 and the second neutral terminal 60 are arranged at the same position in the axial direction, it is possible to reduce the size of the motor 10 in the axial direction as compared with, for example, the case where they are arranged at different positions in the axial direction.

[0030] (5) The number of rows of the first-phase winding 41 is an odd number "3", and the number of rows of the second-phase winding 42 is an even number "4". Therefore, without requiring a special winding method or the like, the first neutral line 41a and the second neutral line 42a can be naturally drawn out from different positions in the radial direction.

[0031] (6) Since the first-phase winding 41 is wound the same number of times for each row, it has the simplest winding method. This embodiment can be implemented with the following modifications. This embodiment and the following modification examples can be implemented in combination with each other within a technically non-conflicting range.

[0032] · In the above embodiment, it is assumed that the first neutral line 41a of the first-phase winding 41 and the second neutral line 42a of the second-phase winding 42 are drawn out from different positions in the radial direction. However, the present invention is not limited to this, and they may be drawn out from the same position in the radial direction.

[0033] · In the above embodiment, it is assumed that the circular first neutral terminal 50 and the second neutral terminal 60 which is circular and has a different diameter from the first neutral terminal 50 are provided. However, the present invention is not limited to this. For example, the first neutral terminal 50 and the second neutral terminal 60 having other shapes may be used.

[0034] · In the above embodiment, it is assumed that the first neutral terminal 50 and the second neutral terminal 60 are arranged at the same position in the axial direction. However, the present invention is not limited to this, and they may be arranged at different positions in the axial direction.

[0035] ·In the above-described embodiment, the number of columns of the first-system winding 41 is the odd number "3", and the number of columns of the second-system winding 42 is the even number "4". However, the present invention is not limited to this, and other numbers may be used. For example, if either one of the number of columns of the first-system winding 41 and the second-system winding 42 is odd and the other is even, they may be changed to other numbers. Also, the number of columns of the first-system winding 41 and the second-system winding 42 may both be odd, may both be even, or may be the same number.

[0036] ·In the above-described embodiment, the first-system winding 41 has the same number of turns for each column and is wound 8 times for each column. However, the present invention is not limited to this, and for example, it may be wound a different number of times depending on the column, or may be wound a number of times other than 8 for each column.

[0037] ·In the above-described embodiment, the stator 20 has the mold resin 70. However, the present invention is not limited to this, and it may be configured not to have the mold resin 70. ·In the above-described embodiment, the stator 20 is configured to have 12 teeth 21b. However, the present invention is not limited to this, and for example, it may be configured to have other numbers of teeth 21b, such as 24.

[0038] The features of the present invention are shown as follows. [1] A stator (20) comprising teeth (21b) arranged in a plurality in the circumferential direction and extending in the radial direction, and windings (23) wound around the teeth by concentrated winding, the windings having a plurality of first-system windings (41) to which a current of a first system is supplied and a plurality of second-system windings (42) to which a current of a second system is supplied, the first-system windings and the second-system windings being alternately arranged in the circumferential direction, the first-system windings being wound around the teeth in a first arrangement, and the second-system windings being wound around the teeth in a second arrangement different from the first arrangement while avoiding the first-system windings between adjacent teeth.

[0039] [2] The first neutral line (41a), which is one terminal line of the first system winding, and the second neutral line (42a), which is one terminal line of the second system winding, are drawn from positions with different radial directions. The stator according to [1].

[0040] [3] A circular first neutral point terminal (50) to which the first neutral line is connected, A circular second neutral point terminal (60) to which the second neutral line is connected and which has a different diameter from the first neutral point terminal. The stator according to claim 2, comprising the second neutral point terminal.

[0041] [4] The first neutral point terminal and the second neutral point terminal are arranged at the same axial position. The stator according to [3]. [5] The first system winding and the second system winding are wound sequentially along the radial direction and are wound back inside and outside in the radial direction and then wound sequentially, so that they are wound in a plurality of rows in the circumferential direction. The number of rows of the first system winding and the second system winding is such that one of them is odd and the other is even. The stator according to any one of [2] to [4].

[0042] [6] Either one of the first system winding and the second system winding is wound the same number of times for each row. The stator according to [5]. [7] A motor (10) comprising the stator according to any one of [1] to [6], and a rotor (30) arranged to face the tip of the teeth and rotatably supported.

Explanation of symbols

[0043] 10... motor, 20... stator, 21b... teeth, 23... winding, 30... rotor, 41... first system winding, 41a... first neutral line, 42... second system winding, 42a... second neutral line, 50... first neutral point terminal, 60... second neutral point terminal.

Claims

1. A plurality of teeth (21b) arranged in the circumferential direction and extending in the radial direction, and a winding (23) wound around the teeth in concentrated winding, The winding has a plurality of first-system windings (41) to which a current of a first system is supplied and a plurality of second-system windings (42) to which a current of a second system is supplied, and the first-system windings and the second-system windings are alternately arranged in the circumferential direction, The first-system windings are wound around the teeth in a first arrangement, The second-system windings are wound around the teeth in a second arrangement different from the first arrangement while avoiding the first-system windings between adjacent teeth, a stator (20).

2. A first neutral line (41a) which is one terminal line of the first-system windings and a second neutral line (42a) which is one terminal line of the second-system windings are drawn out from different positions in the radial direction, the stator according to claim 1.

3. A circular first neutral-point terminal (50) to which the first neutral line is connected, and a circular second neutral-point terminal (60) to which the second neutral line is connected and having a different diameter from the first neutral-point terminal, the stator according to claim 2.

4. The first neutral-point terminal and the second neutral-point terminal are arranged at the same position in the axial direction, the stator according to claim 3.

5. The first-system windings and the second-system windings are wound sequentially along the radial direction and are wound back inside and outside in the radial direction and then wound sequentially, so that they are wound in a plurality of rows in the circumferential direction, The number of rows of the first-system windings and the second-system windings is such that one of them is odd and the other is even, the stator according to claim 2.

6. Either one of the first-system windings and the second-system windings is wound the same number of times for each row, the stator according to claim 5.

7. A stator according to any one of claims 1 to 6, and a rotor (30) disposed to face the tip of the teeth and rotatably supported, the motor (10) comprising the same.

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