Multi-winding motor and motor system and mobile body

Abstract

To reduce the interconnection between windings in different systems. [Solution] The multi-winding motor includes a first winding system to which drive power is supplied from a first inverter, and a second winding system to which drive power is supplied from a second inverter. The multi-winding motor includes a first jumper wire ST1 that electrically connects a plurality of first coils C1 corresponding to the U phase of the first winding system, and a second jumper wire ST2 that electrically connects a plurality of second coils C2 corresponding to the X phase of the second winding system and is arranged to intersect with the first jumper wire ST1.

Description

Technical Field

[0001] The present disclosure relates to a multi-winding motor, a motor system including the same, and a moving body.

Background Art

[0002] Conventionally, a multi-winding motor having a plurality of winding groups with different windings has been known. For example, Patent Document 1 discloses a multi-winding motor having a plurality of winding groups with different numbers of turns, and a plurality of inverters provided corresponding to each winding group, and drives the multi-winding motor with the power output from each inverter.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a multi-winding motor, mutual coupling occurs between winding systems, and thus it is necessary to reduce this mutual coupling.

[0005] The present disclosure has been made in view of such circumstances, and an object thereof is to provide a multi-winding motor capable of reducing mutual coupling between winding systems, a motor system including the same, and a moving body.

Means for Solving the Problems

[0006] One aspect of the present disclosure is a multi-winding motor comprising a first winding system supplied with drive power from a first inverter and a second winding system supplied with drive power from a second inverter, the multi-winding motor comprising a first jumper wire that electrically connects a plurality of first coils corresponding to the first phase of the first winding system and a second jumper wire that electrically connects a plurality of second coils corresponding to the first phase of the second winding system and is arranged to intersect with the first jumper wire.

[0007] One aspect of the present disclosure is a multi-winding motor comprising a first winding system supplied with drive power from a first inverter and a second winding system supplied with drive power from a second inverter, the multi-winding motor comprising a plurality of coils protruding radially from an annular stator core and arranged circumferentially, a first jumper wire electrically connecting a plurality of first coils corresponding to the first phase of the first winding system, and a second jumper wire electrically connecting a plurality of second coils corresponding to the first phase of the second winding, the first jumper wire being arranged on a first surface viewed from a first direction along the axial direction of the stator core, and the second jumper wire being arranged on a second surface viewed from a second direction opposite to the first direction.

[0008] One aspect of the present disclosure is a motor system comprising a multi-winding motor as described above, a first inverter for supplying power to the first winding system, and a second inverter for supplying power to the second winding system.

[0009] One aspect of this disclosure is a mobile body equipped with the above-described motor system. [Effects of the Invention]

[0010] The multi-winding motor, motor system and mobile body of this disclosure can reduce the interconnection between winding systems. [Brief explanation of the drawing]

[0011] [Figure 1]This figure shows a schematic configuration of a motor system according to the first embodiment of this disclosure. [Figure 2] This figure shows the schematic configuration of the first inverter and the second inverter according to the first embodiment of the present disclosure. [Figure 3] This diagram illustrates the mutual bonding (interaction) that occurs between two systems. [Figure 4] These diagrams illustrate the winding structure of a concentrated winding stator. Figure 4(a) shows an example of a concentrated winding stator in which the U-phase and X-phase are wound on the same core, while Figure 4(b) shows an example of a concentrated winding stator in which the U-phase and X-phase are wound on separate cores for each pole. [Figure 5] Figure 4(a) shows the relationship between rotor angle and magnetic flux in a concentrated winding stator. [Figure 6] Figure 4(b) shows the relationship between rotor angle and magnetic flux in a concentrated winding stator. [Figure 7] These diagrams illustrate the winding structure of a distributed winding stator. Figure 7(a) shows an example of a distributed winding stator in which the U-phase and X-phase are wound on the same core, while Figure 7(b) shows an example of a distributed winding stator in which the U-phase and X-phase are wound separately for each pole. [Figure 8] Figure 7(a) shows the relationship between rotor angle and magnetic flux in a distributed winding stator. [Figure 9] Figure 7(b) shows the relationship between rotor angle and magnetic flux in a distributed winding stator. [Figure 10] This is a schematic diagram illustrating the winding structure of a stator according to the first embodiment of this disclosure. [Figure 11] This figure schematically shows an example of a jumper wire for connecting multiple coils in the stator of a multi-winding motor according to the first embodiment of the present disclosure. [Figure 12] This diagram shows a typical arrangement of crossovers. [Figure 13] This figure schematically shows an example of a jumper wire for connecting multiple coils in the stator of a multi-winding motor according to the second embodiment of the present disclosure. [Figure 14] It is a diagram for explaining a general motor system. [Figure 15] It is a diagram for explaining an application example of a motor system according to each embodiment of the present disclosure.

Embodiments for Carrying out the Invention

[0012] 〔First Embodiment〕 Hereinafter, a multi-winding motor, a motor system including the same, and a moving body according to the first embodiment of the present disclosure will be described with reference to the drawings.

[0013] The multi-winding motor according to the present embodiment is applicable to various devices including moving bodies such as EV vehicles. Hereinafter, the case where the multi-winding motor according to the present embodiment is used in a moving body will be exemplified and described.

[0014] FIG. 1 is a diagram showing a schematic configuration of a motor system 1 according to the present embodiment. The motor system 1 is mounted on a moving body 100. As shown in FIG. 1, the motor system 1 according to the present embodiment includes a first inverter 10, a second inverter 20, and a multi-winding motor 30. The motor system 1 also includes a motor controller 40 that controls the first inverter 10 and the second inverter 20.

[0015] Output request commands from a moving body controller 50 included in the moving body 100 and detection values from various sensors such as a resolver 41 and a temperature sensor 42 are input to the motor controller 40. The motor controller 40 generates a PWM control signal for controlling the first inverter 10 and the second inverter 20 based on these input signals, and outputs the PWM control signal to the first inverter 10 and the second inverter 20.

[0016] As shown in Figure 2, the first inverter 10 and the second inverter 20 are equipped with, for example, a plurality of switching elements connected in a three-phase bridge configuration. These switching elements are switched on and off based on a PWM control signal from the motor controller 40, thereby converting DC power from the high-voltage power supply 60 into three-phase AC power, which is then supplied to the multi-winding motor 30. Specifically, the power output from the first inverter 10 is supplied to the first winding system of the multi-winding motor 30, and the power output from the second inverter 20 is supplied to the second winding system of the multi-winding motor 30. This drives the multi-winding motor 30 with a desired torque and rotational speed. Regarding the control method of the first inverter 10 and the second inverter 20, known technologies such as those disclosed in Patent Document 1 can be appropriately adopted.

[0017] Since the multi-winding motor 30 has two windings, mutual coupling (interaction) occurs between the two systems. The mutual inductance M is expressed as follows, as shown in Figure 3, where V1 is the voltage, I1 is the current, and L1 is the self-inductance of the first system, and V2 is the voltage, I2 is the current, and L2 is the self-inductance of the second system. Here, k is the coupling coefficient.

[0018]

number

[0019] By reducing the coupling coefficient k, the mutual inductance M can be reduced.

[0020] Therefore, we will consider a structure that reduces the coupling coefficient k in the multi-winding motor 30. As stator structures for the multi-winding motor 30, for example, a concentrated winding stator and a distributed winding stator can be considered. Figure 4 is a diagram illustrating the winding structure of a concentrated winding stator. In Figure 4, for the sake of simplicity, the U phase (first phase) of the U, V, and W phases that constitute the first system and the X phase (first phase) of the X, Y, and Z phases that constitute the second system are shown, while the other phases are omitted from the illustration.

[0021] Figure 4(a) shows an example of a concentrated winding stator in which the U phase and X phase are wound on the same core, and Figure 4(b) shows an example of a concentrated winding stator in which the U phase and X phase are wound on separate cores for each pole. Figure 5 shows the relationship between rotor angle and magnetic flux in the concentrated-winding stator shown in Figure 4(a), and Figure 6 shows the relationship between rotor angle and magnetic flux in the concentrated-winding stator shown in Figure 4(b). The coupling coefficient of the concentrated-winding stator in Figure 4(a) is 0.9, and the coupling coefficient of the concentrated-winding stator in Figure 4(b) is 0.17. From these results, it can be seen that the concentrated-winding stator in which the U phase and X phase are wound separately for each pole, in other words, the concentrated-winding stator in which each phase is wound separately on the iron core, as shown in Figure 4(b), has a lower coupling coefficient.

[0022] Figure 7 is a diagram illustrating the winding structure of a distributed winding stator. Similar to Figure 4, Figure 7 shows only the U phase (first phase) of the first system and the X phase (first phase) of the second system, and the other phases are omitted from the illustration.

[0023] Figure 7(a) shows an example of a distributed winding stator in which the U phase and X phase are wound on the same core, and Figure 7(b) shows an example of a distributed winding stator in which the U phase and X phase are wound separately for each pole. Figure 8 shows the relationship between rotor angle and magnetic flux in the distributed winding stator shown in Figure 7(a), and Figure 9 shows the relationship between rotor angle and magnetic flux in the distributed winding stator shown in Figure 7(b). The coupling coefficient of the distributed winding stator in Figure 7(a) is 0.9, and the coupling coefficient of the distributed winding stator in Figure 7(b) is 0.16. From these results, it can be seen that the distributed winding stator in which the U phase and X phase are wound separately for each pole, in other words, the distributed winding stator in which each phase is wound separately on the iron core, as shown in Figure 7(b), has a lower coupling coefficient.

[0024] As described above, it is preferable to form a single coil by winding only the same phase of wire around each iron core (tooth).

[0025] Figure 10 is a schematic diagram illustrating the winding structure of the stator 31 according to this embodiment. As shown in Figure 10, the stator 31 includes an annular stator core 32. Each coil corresponding to each phase of the first system (U phase, V phase, W phase) and each coil corresponding to each phase of the second system (X phase, Y phase, Z phase) are arranged in a predetermined order with spacing along the circumferential direction of the annular stator core 32. In Figure 10, the first coil C1 corresponds to the U phase of the first system winding, and the second coil C2 corresponds to the X phase of the second system winding. Note that in Figure 10, the illustration of coils corresponding to phases other than the U phase and X phase is omitted. The arrangement of coils corresponding to phases other than the U phase and X phase can be done by applying known techniques, and a detailed explanation is omitted. Furthermore, in Figure 10, the direction that penetrates the paper is defined as the axial direction of the stator core 32. In addition, the direction along the axial direction, from the front surface to the back surface of the paper, is defined as the first direction, and conversely, the direction from the back surface to the front surface is defined as the second direction.

[0026] Specifically, the stator 31 has a plurality of teeth 33 that protrude radially from the stator core 32 and are spaced apart along the circumferential direction. Each tooth 33 has a winding corresponding to each phase wound around it. When a concentrated winding stator (see Figure 4(b)) is used, the multi-winding motor 30 is a concentrated winding motor with a number of slots that is a multiple of 6. When a distributed winding stator (see Figure 7(b)) is used, the multi-winding motor 30 is a distributed winding motor with a number of slots that is a multiple of 12.

[0027] Figure 11 is a schematic diagram showing an example of jumper wires for connecting multiple coils in the stator 31 of the multi-winding motor 30 according to this embodiment. For the sake of explanation, Figure 11 shows the teeth 33 arranged in a straight line, but in reality, as shown in Figure 10, the teeth 33 are arranged in a ring shape along the inner circumference of the stator core 32.

[0028] As shown in Figure 11, the first jumper wire ST1 electrically connects multiple first coils C1 corresponding to the U phase of the first winding. The second jumper wire ST2 electrically connects multiple second coils C2 corresponding to the X phase of the second winding. The first jumper wire ST1 and the second jumper wire ST2 are arranged to intersect each other.

[0029] Specifically, each first coil C1 is wound around the stator core 32 from the inner circumference to the outer circumference. The first connecting wire ST1 connects the end of one winding of the two first coils C1 to the beginning of the other winding.

[0030] Each second coil C2 is wound around the stator core 32 from the outer circumference towards the inner circumference. The second jumper wire ST2 connects the end of one winding of the two second coils C2 to the beginning of the other winding. As a result, the first jumper wire ST1 and the second jumper wire ST2 are arranged to intersect, as shown in Figure 11.

[0031] Furthermore, the coils of the other phases (V phase, W phase) constituting the first system are configured in the same way as the first coil C1 and first jumper wire ST1 described above. That is, the V phase coil and the W phase coil are wound from the inner circumference to the outer circumference of the stator core 32. The end and beginning of the windings of coils of the same phase are connected by jumper wires.

[0032] Similarly, the coils of the other phases (Y phase and Z phase) constituting the second system are configured in the same way as the second coil C2 and second jumper wire ST2 described above. That is, the Y phase coil and the Z phase coil are wound from the outer circumference to the inner circumference of the stator core 32. The end and beginning of the windings of coils of the same phase are connected by jumper wires.

[0033] As explained above, this embodiment provides the following effects. The motor comprises a first jumper wire ST1 that electrically connects a plurality of first coils C1 constituting the magnetic poles of the U-phase (first phase) of the first winding, and a second jumper wire ST2 that electrically connects a plurality of second coils C2 constituting the magnetic poles of the X-phase (first phase) of the second winding, with the first jumper wire ST1 and the second jumper wire ST2 arranged to intersect. This allows for a shorter distance between the first jumper wire ST1 and the second jumper wire ST2 compared to the normal arrangement where they are arranged in parallel, as shown in Figure 12. This makes it possible to reduce the mutual coupling (coupling coefficient k). Furthermore, it is possible to increase the distance between the first jumper wire ST1 and the second jumper wire ST2, improving manufacturability. This makes it possible to reduce the volume of the coil ends, and a miniaturization of the motor can be expected.

[0034] [Second Embodiment] Next, a multi-winding motor, a motor system equipped therewith, and a mobile body according to the second embodiment of this disclosure will be described with reference to the drawings. The multi-winding motor according to this embodiment differs from the multi-winding motor 30 according to the first embodiment described above in the winding structure of the stator. Hereinafter, components common to the first embodiment will be denoted by the same reference numerals and their descriptions will be omitted, and the differences will be described mainly.

[0035] Figure 13 schematically shows an example of a first jumper wire ST1 and a second jumper wire ST2 for connecting multiple coils in the stator of a multi-winding motor according to this embodiment. For the sake of explanation, Figure 13 shows the teeth 33 arranged in a straight line, but in reality, as shown in Figure 10, the teeth 33 are arranged in a ring shape along the inner circumference of the stator core 32.

[0036] As shown in Figure 13, the first crossover wire ST1 is positioned on the first surface, which is viewed from the front in a first direction along the axial direction of the stator (the direction from the front to the back of the paper in Figure 10), and the second crossover wire ST2 is positioned on the second surface, which is viewed from the front in a second direction opposite to the first direction along the axial direction of the stator core (the direction from the back to the front of the paper in Figure 10).

[0037] Furthermore, although Figure 13 only shows the U phase of the first system and the X phase of the second system, the jumper wires for the V and W phases of the first system are located on the first plane where the first jumper wire ST1 is located, and the jumper wires for the Y and Z phases of the second system are located on the second plane where the second jumper wire ST2 is located.

[0038] As explained above, this embodiment provides the following effects. The motor comprises a first jumper wire ST1 that electrically connects a plurality of first coils C1 corresponding to the U phase (first phase) of the first winding system, and a second jumper wire ST2 that electrically connects a plurality of second coils C2 corresponding to the X phase (first phase) of the second winding system. The first jumper wire ST1 is positioned on a first surface that is viewed from the front in a first direction along the axial direction of the stator (the direction from the front to the back of the paper in Figure 10), and the second jumper wire ST2 is positioned on a second surface that is viewed from the front in a second direction (the direction from the back to the front of the paper in Figure 10). This allows for a longer distance between the first jumper wire ST1 and the second jumper wire ST2 compared to the normal arrangement in which the first jumper wire ST1 and the second jumper wire ST2 are arranged in parallel, as shown in Figure 12. This makes it possible to reduce the mutual coupling (coupling coefficient k). Furthermore, it is possible to improve manufacturability. This makes it possible to reduce the volume of the coil ends, and a miniaturization of the motor can be expected.

[0039] [Examples of application] Generally, motors and inverters are selected in appropriate sizes and capacities according to the size and specifications of the equipment they are installed in. For example, as shown in Figure 14, if the motor's required output is 100kW, a 100kW motor and inverter are used (see Figure 14(a)). If the motor's required output is 200kW, a 200kW motor and inverter are used (see Figure 14(b)), and if the motor's required output is 300kW, a 300kW motor and inverter are used (see Figure 14(c)).

[0040] However, some equipment (especially mobile devices such as vehicles) may require special environmental resistance. In such cases, general-purpose products are difficult to apply, and dedicated development is necessary. For relatively small motor systems, the sales volume can be expected to be high, so the cost of dedicated development is not much of a problem. However, for medium and large-sized systems, the sales volume is not expected to be very high, and the cost of dedicated development becomes a problem.

[0041] In such cases, applying the motor systems according to the embodiments described above can resolve the development cost problem. For example, as shown in Figure 15, when the motor's required output is 100kW, a 100kW motor and one inverter are used (see Figure 15(a)); when the motor's required output is 200kW, a 200kW multi-winding motor 30 and two 100kW inverters are used (see Figure 15(b)); and when the motor's required output is 300kW, a 300kW multi-winding motor and three 100kW inverters are used (see Figure 15(c)).

[0042] Although the present disclosure has been described above using embodiments, the technical scope of the present disclosure is not limited to the scope described in the embodiments above. Various modifications or improvements can be made to the embodiments above without departing from the gist of the disclosure, and such modified or improved forms are also included in the technical scope of the present disclosure.

[0043] For example, in the embodiments described above, the case in which the winding is wound around the teeth 33 was used as an example, but the structure of the coil is not limited to this. For example, a single coil may be manufactured in a separate process and then inserted into the stator. In other words, the stator 31 only needs to have a structure in which coils corresponding to each phase are arranged circumferentially in a predetermined order within the stator core 32.

[0044] The multi-winding motors, motor systems, and mobile bodies described in each of the embodiments above can be understood, for example, as follows.

[0045] A multi-winding motor (30) according to a first aspect of the present disclosure is a multi-winding motor comprising a first system winding to which drive power is supplied from a first inverter (10) and a second system winding to which drive power is supplied from a second inverter (20), wherein the multi-winding motor comprises a first jumper wire (ST1) that electrically connects a plurality of first coils (C1) corresponding to the first phase (U phase) of the first system winding, and a second jumper wire (ST2) that electrically connects a plurality of second coils (C2) corresponding to the first phase (X phase) of the second system winding and is arranged to intersect with the first jumper wire (ST1).

[0046] According to this embodiment, the distance over which the first and second jumpers are arranged in parallel can be shortened compared to the usual arrangement where the first and second jumpers are arranged in parallel. This makes it possible to reduce the mutual coupling (coupling coefficient k). Furthermore, the distance between the first and second jumpers can be increased, improving manufacturability. As a result, the volume of the coil end can be reduced, and miniaturization of the motor can be expected. In each embodiment, the first winding system is described as having U-phase, V-phase, and W-phase, and the second winding system is described as having X-phase, Y-phase, and Z-phase. Furthermore, the U-phase is used as the first phase of the first winding system, and the X-phase is used as the first phase of the second winding system, but the invention is not limited to these examples. For example, the first winding can be the X, Y, or Z phase according to each embodiment, and the second winding can be the U, V, or W phase according to each embodiment. Furthermore, the first phase of the first winding may be a phase other than the U phase, and the first phase of the second winding may be a phase other than the X phase.

[0047] In the second aspect of the present disclosure, the multi-winding motor (30) is configured such that, in the first aspect, a plurality of the first coils (C1) and a plurality of the second coils (C2) are arranged along the circumferential direction of an annular stator core (32), each of the first coils (C1) is wound from the inner circumference to the outer circumference of the stator core (32), and a first jumper wire (ST1) connects the winding end of one of the two first coils (C1) to the winding start of the other, each of the second coils (C2) is wound from the outer circumference to the inner circumference of the stator core (32), and a second jumper wire (ST2) connects the winding end of one of the two second coils to the winding start of the other.

[0048] According to this embodiment, it becomes possible to easily cross the first crossover and the second crossover.

[0049] A multi-winding motor according to a third aspect of the present disclosure is a multi-winding motor comprising a first winding system supplied with drive power from a first inverter (10) and a second winding system supplied with drive power from a second inverter (20), comprising a plurality of coils (C1, C2) protruding radially from an annular stator core (32) and arranged circumferentially, a first jumper wire (ST1) electrically connecting a plurality of first coils (C1) corresponding to the first phase (U phase) of the first winding system from among the plurality of coils (C1, C2), and a second jumper wire (ST2) electrically connecting a plurality of second coils (C2) corresponding to the first phase (X phase) of the second winding from among the plurality of coils (C1, C2), wherein the first jumper wire (ST1) is arranged on a first surface viewed from the front from a first direction along the axial direction of the stator core (32), and the second jumper wire is arranged on a second surface viewed from the front from a second direction opposite to the first direction.

[0050] According to this embodiment, the distance between the first and second jumper wires can be increased compared to the usual arrangement where the first and second jumper wires are arranged in parallel. This makes it possible to reduce the interconnection (coupling coefficient k) between the systems. Furthermore, it is possible to improve manufacturability. As a result, the volume of the coil end can be reduced, and a miniaturization of the motor can be expected.

[0051] A motor system (1) according to a fourth aspect of this disclosure comprises a multi-winding motor (30) described in any of the first to third aspects, a first inverter (10) that supplies power to the first winding system, and a second inverter (20) that supplies power to the second winding system.

[0052] A mobile body (100) according to a fifth aspect of this disclosure comprises the motor system (1) described in the fourth aspect above. [Explanation of Symbols]

[0053] 1: Motor System 10: First Inverter 20: Second Inverter 30: Multi-winding motor 31: Status 32: Stator Core 33: Teeth 40: Motor Controller 41: Resolver 42: Temperature sensor 50: Mobile Controller 60: High-voltage power supply 100: Mobile C1: First coil C2: Second coil ST1: First crossover ST2: Second crossover

Claims

1. A multi-winding motor comprising a first winding system supplied with drive power from a first inverter and a second winding system supplied with drive power from a second inverter, A first jumper wire electrically connects a plurality of first coils corresponding to the first phase of the first winding system, Multiple second coils corresponding to the first phase of the second winding system are electrically connected, and a second jumper wire is arranged to intersect with the first jumper wire. A multi-winding motor equipped with a multi-winding design.

2. The plurality of first coils and the plurality of second coils are arranged along the circumferential direction of the annular stator core, Each of the first coils is wound from the inner circumference to the outer circumference of the stator core, The first jumper wire connects the end of one winding of the two first coils to the beginning of the other winding of the other. Each of the second coils is wound around the stator core from the outer circumference towards the inner circumference, The multi-winding motor according to claim 1, wherein the second jumper wire connects the end of one winding of the two second coils to the beginning of the other winding of the other.

3. A multi-winding motor comprising a first winding system supplied with drive power from a first inverter and a second winding system supplied with drive power from a second inverter, Multiple coils protruding radially from an annular stator core and arranged circumferentially, A first jumper wire electrically connects a plurality of first coils, among the plurality of coils, that correspond to the first phase of the first winding of the first system, A second jumper wire electrically connects a plurality of second coils, among the plurality of coils, that correspond to the first phase of the second winding system. Equipped with, The first crossover wire is positioned on a first surface that is viewed from the front in a first direction along the axial direction of the stator core. The second crossover wire is located on a second surface that is viewed from the front in a second direction opposite to the first direction in a multi-winding motor.

4. A multi-winding motor according to any one of claims 1 to 3, A first inverter that supplies power to the first winding system, A second inverter that supplies power to the second winding system and A motor system equipped with the following features.

5. A mobile body comprising the motor system described in claim 4.

Images