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. A first neutral wire 41a, which is one terminal wire of the first system winding, and a second neutral wire 42a, which is one terminal wire of the second system winding, are drawn from different positions in the radial direction.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 teeth arranged in a plurality 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 having redundancy by the windings having a plurality of first-system windings to which a first-system three-phase alternating current is supplied and a plurality of second-system windings to which a second-system three-phase alternating current is supplied (for example, see 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, the arrangement of all the windings was the same. Therefore, for example, in a configuration in which first neutral lines, which are terminal lines of the first-system windings, are connected to each other and second neutral lines, which are terminal lines of the second-system windings, are connected to each other, the first neutral line and the second neutral line are drawn out from the same position in the radial direction. Therefore, there was a problem that the workability of connection was poor because the first neutral line and the second neutral line were concentrated.

[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 improving the workability of connection.

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 include 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. 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.

[0007] According to this configuration, since the first neutral line which is one terminal line of the first-system windings and the second neutral line which is one terminal line of the second-system windings are drawn out from different positions in the radial direction, 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 and the second neutral line are dispersed in the radial direction, concentration can be avoided and each connection becomes easier.

[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, in the motor, the above effects can be obtained.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Mode 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 exaggerated or simplified. 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 for the X phase, Y phase, and Z phase. The second inverter circuit can generate a second system of three-phase alternating current for 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 windings 23. In FIGS. 1 and 2, the cross-sections of the insulator 22 and the windings 23 are schematically illustrated. 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 windings 23 are wound around the teeth 21b in concentrated windings via the insulator 22.

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

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

[0015] As shown in FIG. 2, the first-system winding 41 is wound around the teeth 21b in the 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 the circumferentially adjacent teeth 21b. Also, 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. 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, the first power line 41b, which is the other terminal line of the first-system winding 41, and the 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 winding 41 and the second-system winding 42 are wound successively along the radial direction and are wound successively after being folded back inside and outside in the radial direction, so that they are wound in a plurality of rows in the circumferential direction.

[0017] Specifically, the first-phase winding 41 is wound from a portion on the radially outer side that becomes the first power line 41b. Then, the first-phase 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-phase winding 41 is wound in three rows in the circumferential direction. Note that the first-phase 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-phase 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-phase 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-phase winding 42 is wound from a portion on the radially outer side that becomes the second power line 42b. The second-phase 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-phase winding 42 is wound in four rows in the circumferential direction. Note that for the second-phase 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-phase winding 41 and the second-phase winding 42 is the same, and in this embodiment, both are wound 24 times. Further, since the end of the winding of the second-phase 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 position in the axial direction. The first neutral terminal 50 and the second neutral terminal 60 of the present embodiment have connection portions 50a and 60a that rise axially from a disk shape.

[0022] All the first neutral lines 41a are connected to the connection portion 50a of the first neutral terminal 50. Also, all the second neutral lines 42a are connected to the connection portion 60a of the second neutral terminal 60. 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 extends in the axial direction and is connected to the first neutral terminal 50 without being substantially 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 extends in the axial direction and is connected to the first neutral terminal 50 without being substantially 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 around in the circumferential direction 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) 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, compared with the case where they are drawn out from the same position in the radial direction, the respective connections are facilitated. 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 the respective connections are facilitated.

[0027] (2) Since the circular first neutral point terminal 50 and the circular second neutral point terminal 60 having a different diameter from the first neutral point terminal 50 are provided, the first neutral line 41a and the second neutral line 42a can be respectively connected with a simple configuration.

[0028] (3) Since the first neutral point terminal 50 and the second neutral point terminal 60 are arranged at the same position in the axial direction, for example, compared with the case where they are arranged at different positions in the axial direction, it is possible to reduce the size of the motor 10 in the axial direction.

[0029] (4) Since the number of columns of the first system winding 41 is an odd number, specifically "3", and the number of columns of the second system winding 42 is an even number, specifically "4", the first neutral line 41a and the second neutral line 42a can be naturally drawn out from different positions in the radial direction without requiring any special winding method or the like.

[0030] (5) Since the first system winding 41 is wound the same number of times for each column, it has the simplest winding method. (6) 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. Therefore, the occupation ratio 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 occupation ratio 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 on the inner side in the radial direction. 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 inner side in the radial direction. However, by avoiding this, the occupation ratio 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 arrangement is 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 imbalance becomes unnecessary.

[0031] The present embodiment can be implemented with the following modifications. The present embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range. · In the above-described embodiment, it is assumed that the circular first neutral point terminal 50 and the circular second neutral point terminal 60 having a different diameter from the first neutral point terminal 50 are provided, but the present invention is not limited thereto. For example, the first neutral point terminal 50 and the second neutral point terminal 60 having other shapes may be used.

[0032] · In the above-described embodiment, the first neutral point terminal 50 and the second neutral point terminal 60 are arranged at the same position in the axial direction, but the present invention is not limited thereto, and they may be arranged at different positions in the axial direction.

[0033] · In the above-described embodiment, the number of rows of the first system winding 41 is the odd number "3", and the number of rows of the second system winding 42 is the even number "4", but the present invention is not limited thereto, and other numbers may be used. For example, if either one of the number of rows 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. Further, the number of rows 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.

[0034] · In the above-described embodiment, the first system winding 41 has the same number of turns for each row and is wound 8 times for each row, but the present invention is not limited thereto. For example, it may be wound a different number of times for each row, or may be wound a number of times other than 8 for each row.

[0035] · In the above-described embodiment, the stator 20 has the mold resin 70, but the present invention is not limited thereto, 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, but the present invention is not limited thereto. For example, it may be configured to have other numbers of teeth 21b, such as 24.

[0036] The features of the present invention are shown as follows. [1] A stator (20) comprising 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, wherein 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, and 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.

[0037] [2] The stator according to [1], further comprising 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.

[0038] [3] The stator according to [2], wherein the first neutral-point terminal and the second neutral-point terminal are arranged at the same axial position. [4] 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 as to be wound in a plurality of rows in the circumferential direction, and 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 any one of [1] to [3].

[0039] [5] In the stator according to [4], either one of the first-system windings and the second-system windings is wound the same number of times for each row. [6] A motor (10) comprising the stator according to any one of [1] to [5] and a rotor (30) arranged to face the tips of the teeth and rotatably supported.

Description of reference numerals

[0040] 10... motor, 20... stator, 21b... teeth, 23... windings, 30... rotor, 41... first-system windings, 41a... first neutral line, 42... second-system windings, 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, A stator (20) in which a first neutral line (41a), which is one terminal line of the first-system winding, and a second neutral line (42a), which is one terminal line of the second-system winding, are drawn out from different positions in the radial direction.

2. A circular first neutral-point terminal (50) to which the first neutral line is connected, and a second neutral-point terminal (60) that is circular, to which the second neutral line is connected, and has a different diameter from the first neutral-point terminal. The stator according to claim 1.

3. The stator according to claim 2, wherein the first neutral-point terminal and the second neutral-point terminal are arranged at the same position in the axial direction.

4. 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, and 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 claim 1.

5. The stator according to claim 4, wherein either one of the first-system winding and the second-system winding is wound the same number of times for each row.

6. A stator according to any one of claims 1 to 5, and a rotor (30) arranged to face the tip of the teeth and rotatably supported. A motor (10).

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