Unit

Abstract

[Problem] To provide a unit having an excellent system when configuring a rotating electric machine having two three-phase coils. [Solution] A drive unit 100 comprises: a first battery 2a; a second battery 2b; a first inverter circuit 3a electrically connected to the first battery 2a via a first power supply line 5a; a second inverter circuit 3b electrically connected to the second battery 2b via a second power supply line 5b; a first U-phase wire 31U, a first V-phase wire 31V, and a first W-phase wire 31W which are electrically connected to the first inverter circuit 3a; a second U-phase wire 32U, a second V-phase wire 32V, and a second W-phase wire 32W which are electrically connected to the second inverter circuit 3b; and a rotor 10 that rotates by magnetic fields generated by the first U-phase wire 31U, the first V-phase wire 31V, the first W-phase wire 31W, the second U-phase wire 32U, the second V-phase wire 32V, and the second W-phase wire 32W.

Description

unit

[0001] The present invention relates to a unit.

[0002] Patent Document 1 discloses a stator structure of a polyphase motor (rotating electric machine) having two three-phase coils.

[0003] Japanese Patent Application Laid-Open No. 2005-086879

[0004] SUMMARY OF THE INVENTION An object of the present invention is to provide a unit having an excellent system for constructing a rotating electric machine having two three-phase coils.

[0005] According to one aspect of the present invention, a unit includes a first power supply, a second power supply, a first inverter circuit electrically connected to the first power supply via a first power supply line, a second inverter circuit electrically connected to the second power supply via a second power supply line, a first U-phase wire electrically connected to the first inverter circuit, a first V-phase wire electrically connected to the first inverter circuit, a first W-phase wire electrically connected to the first inverter circuit, a second U-phase wire electrically connected to the second inverter circuit, a second V-phase wire electrically connected to the second inverter circuit, a second W-phase wire electrically connected to the second inverter circuit, and a common rotor that rotates by magnetic fields generated by the first U-phase wire, the first V-phase wire, the first W-phase wire, the second U-phase wire, the second V-phase wire, and the second W-phase wire.

[0006] According to one aspect of the present invention, it is possible to provide a unit having an excellent system for constructing a rotating electric machine having two three-phase coils.

[0007] FIG. 1 is a configuration diagram of a unit according to an embodiment of the present invention. FIG. 2 is a configuration diagram of a unit according to a modified embodiment of the present invention. FIG. 3 is a configuration diagram showing a rotating electric machine according to a first embodiment as viewed from the side opposite the lead wires. FIG. 4 is a configuration diagram showing only the first three-phase coils in FIG. 3. FIG. 5 is a configuration diagram showing only the second three-phase coils in FIG. 3. FIG. 6 is a development diagram of the windings of the rotating electric machine as viewed from the inner circumference with the lead wire side facing up. FIG. 7 is a graph showing the time variation of induced voltage when two windings of the same phase are wound in different styles. FIG. 8 is a graph showing the time variation of induced voltage when the windings of two same phases are shifted by 180 electrical degrees from FIG. 7. FIG. 9 is a graph showing the time variation of induced voltage when the current flow direction of one phase is reversed from FIG. 8. FIG. 10 is a configuration diagram showing a rotating electric machine according to a second embodiment as viewed from the side opposite the lead wires. Fig. 11 is a structural diagram showing a rotating electric machine when the windings are full-pitch windings, as viewed from the side opposite the lead wire. Fig. 12 is a development view of the windings in Fig. 11, as viewed from the outer periphery, with the side opposite the lead wire facing up. Fig. 13 is a structural diagram showing a rotating electric machine when the windings are fractional-pitch windings, as viewed from the side opposite the lead wire. Fig. 14 is a structural diagram of the windings in Fig. 13.

[0008] A rotating electrical machine drive unit (hereinafter simply referred to as a "drive unit") 100 as a unit according to an embodiment of the present invention will be described below with reference to the drawings.

[0009] First, the configuration of a drive unit 100 will be described with reference to Fig. 1 to Fig. 3. Fig. 1 is a configuration diagram of the drive unit 100. Fig. 2 is a configuration diagram of a drive unit 100 according to a modified example. Fig. 3 is a configuration diagram showing the rotating electric machine 1 according to the first embodiment as viewed from the side opposite the lead wires.

[0010] 1, the drive unit 100 includes a rotating electric machine 1, a power supply 2, an inverter circuit 3 as a drive circuit, and a controller 4 as a control device. The drive unit 100 is mounted on, for example, a vehicle, and uses electric power supplied from the power supply 2 to cause the rotating electric machine 1 to generate driving force for driving drive wheels (not shown).

[0011] The rotating electric machine 1 has a first U-phase lead wire U1in, a first V-phase lead wire V1in, a first W-phase lead wire W1in, a second U-phase lead wire U2in, a second V-phase lead wire V2in, and a second W-phase lead wire W2in.

[0012] As shown in Fig. 3, the rotating electric machine 1 includes a rotor 10 as a rotor and a stator 20 as a stator. Here, the rotating electric machine 1 is an electric motor having two three-phase coils (a first three-phase coil 31 and a second three-phase coil 32) (see Figs. 4 and 5). The rotating electric machine 1 is mounted on, for example, a vehicle and can be used as both an electric motor that generates driving force and a generator that generates regenerative power when not driven. Hereinafter, the direction of the central axis of the rotating electric machine 1 will be referred to as the "axial direction," the direction of rotation of the rotor 10 in the rotating electric machine 1 will be referred to as the "circumferential direction," and the direction extending radially from the central axis of the rotating electric machine 1 will be referred to as the "radial direction."

[0013] Rotor 10 includes rotor core 11, rotor shaft 12, and a plurality of permanent magnets 13. Rotor 10 is a common rotor that rotates due to magnetic fields generated by a first U-phase wire 31U, a first V-phase wire 31V, a first W-phase wire 31W, a second U-phase wire 32U, a second V-phase wire 32V, and a second W-phase wire 32W, which will be described later.

[0014] The rotor core 11 is formed in a generally cylindrical shape extending in the axial direction. The rotor core 11 has a through hole that penetrates in the axial direction. A rotor shaft 12 is provided in the through hole. The rotor core 11 is rotatably supported by the rotor shaft 12.

[0015] A plurality of permanent magnets 13 are housed in the rotor core 11. Here, four sets (eight pieces) of permanent magnets 13 are provided corresponding to the four poles, but the number is not limited to this.

[0016] The stator 20 is a four-pole stator and includes a stator core 21 as a common core and windings 30. The stator 20 is configured by windings 30 around the stator core 21, which are wound with a first U-phase wire 31U, a first V-phase wire 31V, a first W-phase wire 31W, a second U-phase wire 32U, a second V-phase wire 32V, and a second W-phase wire 32W, which will be described later.

[0017] The stator core 21 is formed in a generally cylindrical shape extending in the axial direction. The stator core 21 is provided with a through-hole that penetrates in the axial direction. The rotor 10 is disposed in the through-hole so as to be relatively rotatable. The stator core 21 has a plurality of (24 in this example) teeth 22 and a plurality of (24 in this example) slots 23.

[0018] The teeth 22 protrude radially inward from the inner circumferential surface of the stator core 21. The teeth 22 are arranged on the inner circumferential surface of the stator core 21 at equal intervals in the circumferential direction.

[0019] The slots 23 are formed between each pair of circumferentially adjacent teeth 22. The slots 23 open into through holes in the stator core 21. The multiple slots 23 are arranged at equal intervals in the circumferential direction on the inner peripheral surface of the stator core 21.

[0020] Specifically, the slots 23 include a first slot 23a, a second slot 23b, a third slot 23c, a fourth slot 23d, a fifth slot 23e, a sixth slot 23f, a seventh slot 23g, an eighth slot 23h, a ninth slot 23i, a tenth slot 23j, an eleventh slot 23k, a twelfth slot 23l, a thirteenth slot 23m, a fourteenth slot 23n, a fifteenth slot 23o, a sixteenth slot 23p, a seventeenth slot 23q, an eighteenth slot 23r, a nineteenth slot 23s, a twentieth slot 23t, a twenty-first slot 23u, a twenty-second slot 23v, a twenty-third slot 23w, and a twenty-fourth slot 23x. The first to twenty-fourth slots 23a to 23x are arranged adjacent to each other in the circumferential direction, and the twenty-fourth slot 23x and the first slot 23a are arranged adjacent to each other in the circumferential direction, so that the slots are arranged at equal intervals around the entire circumference.

[0021] The winding 30 includes a first three-phase coil 31 and a second three-phase coil 32. In other words, the rotating electric machine 1 is a multi-phase motor having two three-phase coils (the first three-phase coil 31 and the second three-phase coil 32) wound around a single stator 20, forming a dual three-phase winding.

[0022] First three-phase coil 31 has a first U-phase wire 31U, a first V-phase wire 31V, and a first W-phase wire 31W. First three-phase coil 31 constitutes a three-phase, four-pole coil. Second three-phase coil 32 has a second U-phase wire 32U, a second V-phase wire 32V, and a second W-phase wire 32W. Second three-phase coil 32 constitutes a three-phase, four-pole coil. First U-phase wire 31U, first V-phase wire 31V, first W-phase wire 31W, second U-phase wire 32U, second V-phase wire 32V, and second W-phase wire 32W are electrically independent from one another.

[0023] The winding layout is designed so that first U-phase wire 31U and second U-phase wire 32U are in phase with each other. The winding layout is designed so that first V-phase wire 31V and second V-phase wire 32V are in phase with each other. The winding layout is designed so that first W-phase wire 31W and second W-phase wire 32W are in phase with each other.

[0024] A winding layout designed to have the same phase means that when the periods of the induced voltage waveforms of the same type of windings 30 (the set of first U phase wire 31U and second U phase wire 32U, the set of first V phase wire 31V and second V phase wire 32V, and the set of first W phase wire 31W and second W phase wire 32W) are made equal, the peak (top) positions are the same. In this case, the amplitude (peak size) does not necessarily have to match because it depends on the supply current. The specific configuration of the windings 30 in the rotating electric machine 1 will be described in detail later with reference to FIGS. 3 to 14.

[0025] The power supply 2 includes a first battery 2a as a first power supply and a second battery 2b as a second power supply.

[0026] The first battery 2a is a secondary battery that supplies power to the first three-phase coil 31 when the rotating electric machine 1 operates as an electric motor, and stores regenerated power from the first three-phase coil 31 when the rotating electric machine 1 operates as a generator.

[0027] The second battery 2b is a secondary battery that supplies power to the second three-phase coil 32 when the rotating electric machine 1 operates as an electric motor, and stores regenerated power from the second three-phase coil 32 when the rotating electric machine 1 operates as a generator.

[0028] The inverter circuit 3 includes a first inverter circuit 3a and a second inverter circuit 3b.

[0029] The first inverter circuit 3a is electrically connected to the first battery 2a via the first power supply line 5a. The first inverter circuit 3a is electrically connected to the first U-phase wire 31U, the first V-phase wire 31V, and the first W-phase wire 31W via the first U-phase lead wire U1in, the first V-phase lead wire V1in, and the first W-phase lead wire W1in. The first inverter circuit 3a includes a plurality of IGBTs (Insulated Gate Bipolar Transistors) as switching elements and a smoothing capacitor, although not shown.

[0030] The second inverter circuit 3b is electrically connected to the second battery 2b via a second power supply line 5b. The second inverter circuit 3b is electrically connected to the second U-phase wire 32U, the second U-phase wire 32V, and the second W-phase wire 32W via a second U-phase lead wire U2in, a second V-phase lead wire V2in, and a second W-phase lead wire W2in. The first inverter circuit 3a has a plurality of IGBTs (Insulated Gate Bipolar Transistors) as switching elements and a smoothing capacitor, although not shown.

[0031] The first power supply line 5a and the second power supply line 5b are electrically independent. The first power supply line 5a is provided with a first relay circuit 6a that can cut off connection with the first battery 2a. The second power supply line 5b is provided with a second relay circuit 6b that can cut off connection with the second battery 2b.

[0032] The controller 4 includes a first controller 4a and a second controller 4b.

[0033] The first controller 4a controls the first inverter circuit 3a. Specifically, the first controller 4a switches on / off the multiple IGBTs in the first inverter circuit 3a to convert DC power supplied from the first battery 2a into three-phase AC power for driving the first three-phase coil 31 of the rotating electric machine 1. The first controller 4a also switches on / off the multiple IGBTs in the first inverter circuit 3a to convert regenerative power (three-phase AC power) from the first three-phase coil 31 of the rotating electric machine 1 into DC power that can be charged to the first battery 2a.

[0034] The second controller 4b controls the second inverter circuit 3b. Specifically, the second controller 4b switches on / off the multiple IGBTs in the second inverter circuit 3b to convert DC power supplied from the second battery 2b into three-phase AC power for driving the second three-phase coil 32 of the rotating electric machine 1. The second controller 4b also switches on / off the multiple IGBTs in the second inverter circuit 3b to convert regenerative power (three-phase AC power) from the second three-phase coil 32 of the rotating electric machine 1 into DC power that can be charged to the second battery 2b.

[0035] In this way, by dividing the controller 4 into the first controller 4a and the second controller 4b, the first controller 4a and the second controller 4b can be placed in different locations, thereby improving the layout flexibility in the vehicle.

[0036] 2, the first inverter circuit 3a and the second inverter circuit 3b may be controlled by a single controller 4. When a single controller 4 is provided, it is possible to reduce the size of the drive unit 100 and the number of parts.

[0037] Here, the inverter circuit 3 (IGBTs and smoothing capacitor components) can be shared between the first U-, V-, and W-phase wires 31U, 31V, and 31W and the second U-, V-, and W-phase wires 32U, 32V, and 32W, or can be provided separately. Using a common inverter circuit 3 offers the advantage of reducing the number of components. On the other hand, using separate inverter circuits 3 allows for a lower current flow compared to using a common inverter circuit 3. In other words, using a common inverter circuit 3 requires a single wiring to supply the current required for the first U-phase wire 31U and the current required for the second U-phase wire 32U. However, using separate inverter circuits 3 allows for separate wiring for the first power line 5a and the second power line 5b, thereby reducing the current flowing through the single wiring. In one aspect of the present invention, the latter advantage of reducing the current flow is selected.

[0038] Furthermore, when the inverter circuits 3 are separated, the power supply 2 for each inverter circuit 3 can be shared or separated. Sharing the power supply 2 for each inverter circuit 3 offers the advantage of reducing the number of components. On the other hand, when the power supplies 2 for each inverter circuit 3 are separated, the amount of current can be reduced compared to when the power supplies 2 are shared. In other words, when the power supplies 2 for the inverter circuits 3 are shared, for example, a single wiring is required to supply the amount of current required for two inverter circuits 3. However, when the power supplies 2 for the inverter circuits 3 are separated, the wiring can be separated into a first power supply line 5a and a second power supply line 5b, thereby reducing the amount of current supplied to a single wiring. In one aspect of the present invention, the latter advantage of reducing the amount of current is selected.

[0039] In this way, even at the expense of reducing the number of parts, the inverter circuit 3 and power supply 2 are divided into multiple parts and electrically isolated, and the various wiring is also divided into multiple parts and electrically isolated, thereby making it possible to reduce the maximum amount of current flowing within the drive unit 100.

[0040] Here, when the voltage is higher than a certain value, measures against high voltages may be required by law, and therefore, under certain conditions, there is a demand to lower the operating voltage (for example, 48 V). Even in such a case, if torque (output) of the rotating electric machine 1 is required, the amount of current must be increased to improve output. In such a situation, when one aspect of the present invention is applied, the peak value of the amount of current can be reduced by separating the power supply 2, the inverter circuit 3, and the wiring (the first power line 5 a and the second power line 5 b). One aspect of the present invention can be said to be a particularly useful technique in such a situation.

[0041] Next, an embodiment of the rotating electrical machine 1 applicable to the drive unit 100 will be described.

[0042] First Embodiment First, the configuration of a rotating electric machine 1 according to a first embodiment will be described with reference to Fig. 3 to Fig. 6. Fig. 3 is a configuration diagram showing the rotating electric machine 1 as viewed from the side opposite the lead wires. Fig. 4 is a configuration diagram showing only the first three-phase coil 31 in Fig. 3. Fig. 5 is a configuration diagram showing only the second three-phase coil 32 in Fig. 3. Fig. 6 is a development view of the windings 30 in the rotating electric machine 1 as viewed from the inner periphery with the lead wire side facing up.

[0043] 3 to 5, a circle with an x ​​inside it indicates that the winding 30 is wound from the front to the back, and a current flows from the front to the back. A circle with a black dot inside it indicates that the winding 30 is wound from the back to the front, and a current flows from the back to the front.

[0044] The plurality of slots 23 are configured so that the winding 30 passes through each of them an odd number of times. Here, the stator 20 is configured so that the winding 30 passes through each of the plurality of slots 23 three times. This minimizes the number of windings and improves manufacturability. That is, one aspect of the present invention is particularly advantageous in such cases, making it easier to make the number of passes of the winding 30 through each slot 23 uniform.

[0045] 3 and 5, the first U-phase wire 31U is wound in a plurality of slots 23. The first U-phase wire 31U has a first winding 31U1, a second winding 31U2, a third winding 31U3, a fourth winding 31U4, a fifth winding 31U5, and a sixth winding 31U6.

[0046] The first winding 31U1 is formed by winding a winding 30 input from a first U-phase lead wire U1in connected to a three-phase AC power supply (not shown) between the thirteenth slot 23m and the eighth slot 23h. The second winding 31U2 is formed by winding a winding 30 continuous from the first winding 31U1 wound in the eighth slot 23h between the thirteenth slot 23m and the eighth slot 23h. The third winding 31U3 is formed by winding a winding 30 continuous from the second winding 31U2 wound in the eighth slot 23h between the twelfth slot 23l and the seventh slot 23g.

[0047] The fourth winding 31U4 is wound between the first slot 23a and the twentieth slot 23t, continuing from the third winding 31U3 wound in the seventh slot 23g. The fifth winding 31U5 is wound between the first slot 23a and the twentieth slot 23t, continuing from the fourth winding 31U4 wound in the twentieth slot 23t. The sixth winding 31U6 is wound between the 24th slot 23x and the 19th slot 23s, continuing from the fifth winding 31U5 wound in the twentieth slot 23t. After being wound in the 19th slot 23s, the sixth winding 31U6 is connected to the first neutral point Mid1.

[0048] Thus, the first U phase wire 31U has a first coil 31UA that is wound two times between the 13th slot 23m and the 8th slot 23h and one time between the 12th slot 23l and the 7th slot 23g, and a second coil 31UB that is wound two times between the 1st slot 23a and the 20th slot 23t and one time between the 24th slot 23x and the 19th slot 23s.

[0049] The first V-phase wire 31V has a first winding 31V1, a second winding 31V2, a third winding 31V3, a fourth winding 31V4, a fifth winding 31V5, and a sixth winding 31V6.

[0050] The first winding 31V1 is formed by winding a winding 30 input from a first V-phase lead wire V1in connected to a three-phase AC power supply between the seventeenth slot 23q and the twelfth slot 23l. The second winding 31V2 is formed by winding a winding 30 continuous from the first winding 31V1 wound in the twelfth slot 23l between the seventeenth slot 23q and the twelfth slot 23l. The third winding 31V3 is formed by winding a winding 30 continuous from the second winding 31V2 wound in the twelfth slot 23l between the sixteenth slot 23p and the eleventh slot 23k.

[0051] The fourth winding 31V4 is wound between the fifth slot 23e and the twenty-fourth slot 24x, continuing from the third winding 31V3 wound in the eleventh slot 23k. The fifth winding 31V5 is wound between the fifth slot 23e and the twenty-fourth slot 23x, continuing from the fourth winding 31V4 wound in the twenty-fourth slot 23x. The sixth winding 31V6 is wound between the fourth slot 23d and the twenty-third slot 23w, continuing from the fifth winding 31V5 wound in the twenty-fourth slot 23x. After being wound in the twenty-third slot 23w, the sixth winding 31V6 is connected to the first neutral point Mid1.

[0052] Thus, the first V-phase wire 31V has a first coil 31VA that is wound two times between the 17th slot 23q and the 12th slot 23l and one time between the 16th slot 23p and the 11th slot 23k, and a second coil 31VB that is wound two times between the 5th slot 23e and the 24th slot 23x and one time between the 4th slot 23d and the 23rd slot 23w.

[0053] The first W-phase wire 31W has a first winding 31W1, a second winding 31W2, a third winding 31W3, a fourth winding 31W4, a fifth winding 31W5, and a sixth winding 31W6.

[0054] The first winding 31W1 is formed by winding the winding 30 input from the first W-phase lead wire W1in connected to the three-phase AC power supply between the 21st slot 23u and the 16th slot 23p. The second winding 31W2 is formed by winding the winding 30 between the 21st slot 23u and the 16th slot 23p, continuing from the first winding 31W1 wound in the 16th slot 23p. The third winding 31W3 is formed by winding the winding 30 between the 20th slot 23t and the 15th slot 23o, continuing from the second winding 31W2 wound in the 16th slot 23p.

[0055] The fourth winding 31W4 is wound between the ninth slot 23i and the fourth slot 23d, continuing from the third winding 31W3 wound in the fifteenth slot 23o. The fifth winding 31W5 is wound between the ninth slot 23i and the fourth slot 23d, continuing from the fourth winding 31W4 wound in the fourth slot 23d. The sixth winding 31W6 is wound between the eighth slot 23h and the third slot 23c, continuing from the fifth winding 31W5 wound in the fourth slot 23d. The sixth winding 31V6 is wound around the third slot 23c and then connected to the first neutral point Mid1.

[0056] Thus, the first W phase wire 31W has a first coil 31WA that is wound two times between the 21st slot 23u and the 16th slot 23p and one time between the 20th slot 23t and the 15th slot 23o, and a second coil 31WB that is wound two times between the 9th slot 23i and the 4th slot 23d and one time between the 8th slot 23h and the 3rd slot 23c.

[0057] 3 and 6, the second U-phase wire 32U is wound in a plurality of slots 23. The second U-phase wire 32U has a first winding 32U1, a second winding 32U2, a third winding 32U3, a fourth winding 32U4, a fifth winding 32U5, and a sixth winding 32U6.

[0058] The first winding 32U1 is formed by winding the winding 30 input from the second U-phase lead wire U2in connected to the three-phase AC power supply between the thirteenth slot 23m and the eighteenth slot 23r. The second winding 32U2 is formed by winding the winding 30 between the fourteenth slot 23n and the nineteenth slot 23s, continuing from the first winding 32U1 wound in the eighteenth slot 23r. The third winding 32U3 is formed by winding the winding 30 between the fourteenth slot 23n and the nineteenth slot 23s, continuing from the second winding 32U2 wound in the nineteenth slot 23s.

[0059] The fourth winding 32U4 is wound between the first slot 23a and the sixth slot 23f, continuing from the third winding 32U3 wound in the nineteenth slot 23s. The fifth winding 32U5 is wound between the second slot 23b and the seventh slot 23g, continuing from the fourth winding 32U4 wound in the sixth slot 23f. The sixth winding 32U6 is wound between the second slot 23b and the seventh slot 23g, continuing from the fifth winding 32U5 wound in the seventh slot 23g. After being wound in the seventh slot 23g, the sixth winding 32U6 is connected to the second neutral point Mid2.

[0060] Thus, the second U phase wire 32U has a first coil 32UA that is wound once between the 13th slot 23m and the 18th slot 23r and wound twice between the 14th slot 23n and the 19th slot 23s, and a second coil 32UB that is wound once between the first slot 23a and the 6th slot 23f and wound twice between the second slot 23b and the 7th slot 23g.

[0061] As shown in FIG. 6, second U-phase wire 32U is wound around a slot position where the current flow direction is reversed relative to first U-phase wire 31U and shifted by 180 electrical degrees (90 mechanical degrees).

[0062] The second V-phase wire 32V has a first winding 32V1, a second winding 32V2, a third winding 32V3, a fourth winding 32V4, a fifth winding 32V5, and a sixth winding 32V6.

[0063] The first winding 32V1 is formed by winding the winding 30 input from the second V-phase lead wire V2in connected to the three-phase AC power supply between the 17th slot 23q and the 22nd slot 23v. The second winding 32V2 is formed by winding the winding 30 between the 18th slot 23r and the 23rd slot 23w, continuing from the first winding 32V1 wound in the 22nd slot 23v. The third winding 32V3 is formed by winding the winding 30 between the 18th slot 23r and the 23rd slot 23w, continuing from the second winding 32V2 wound in the 23rd slot 23w.

[0064] The fourth winding 32V4 is wound between the fifth slot 23e and the tenth slot 23j, continuing from the third winding 32V3 wound in the twenty-third slot 23w. The fifth winding 32V5 is wound between the sixth slot 23f and the eleventh slot 23k, continuing from the fourth winding 32V4 wound in the tenth slot 23j. The sixth winding 32V6 is wound between the sixth slot 23f and the eleventh slot 23k, continuing from the fifth winding 32V5 wound in the eleventh slot 23k. After being wound in the eleventh slot 23k, the sixth winding 32V6 is connected to the second neutral point Mid2.

[0065] Thus, the second V-phase wire 32V has a first coil 32VA that is wound once between the 17th slot 23q and the 22nd slot 23v and wound twice between the 18th slot 23r and the 23rd slot 23w, and a second coil 32VB that is wound once between the 5th slot 23e and the 10th slot 23j and wound twice between the 6th slot 23f and the 11th slot 23k.

[0066] As shown in FIG. 6, the second V-phase wire 32V is wound in a slot position where the current flow direction is reversed relative to the first V-phase wire 31V and shifted by 180 electrical degrees (90 mechanical degrees).

[0067] The second W-phase wire 32W has a first winding 32W1, a second winding 32W2, a third winding 32W3, a fourth winding 32W4, a fifth winding 32W5, and a sixth winding 32W6.

[0068] The first winding 32W1 is formed by winding the winding 30 input from the second W-phase lead wire W2in connected to the three-phase AC power supply between the 21st slot 23u and the 2nd slot 23b. The second winding 32W2 is formed by winding the winding 30 between the 22nd slot 23v and the 3rd slot 23c, continuing from the first winding 32W1 wound in the 2nd slot 23b. The third winding 32W3 is formed by winding the winding 30 between the 22nd slot 23v and the 3rd slot 23c, continuing from the second winding 32W2 wound in the 3rd slot 23c.

[0069] The fourth winding 32W4 is wound between the ninth slot 23i and the fourteenth slot 23n, continuing from the third winding 32W3 wound in the third slot 23c. The fifth winding 32W5 is wound between the tenth slot 23j and the fifteenth slot 23o, continuing from the fourth winding 32W4 wound in the fourteenth slot 23n. The sixth winding 32W6 is wound between the tenth slot 23j and the fifteenth slot 23o, continuing from the fifth winding 32W5 wound in the fifteenth slot 23o. After being wound in the fifteenth slot 23o, the sixth winding 32V6 is connected to the second neutral point Mid2.

[0070] Thus, the second W phase wire 32W has a first coil 32WA that is wound once between the 21st slot 23u and the second slot 23b and wound twice between the 22nd slot 23v and the third slot 23c, and a second coil 32WB that is wound once between the 9th slot 23i and the 14th slot 23n and wound twice between the 10th slot 23j and the 15th slot 23o.

[0071] As shown in FIG. 6, the second W phase wire 32W is wound around a slot position where the current flow direction is reversed and shifted by 180 electrical degrees relative to the first W phase wire 31W.

[0072] 4 and 5, first U-phase wire 31U, first V-phase wire 31V, first W-phase wire 31W, second U-phase wire 32U, second V-phase wire 32V, and second W-phase wire 32W are configured as short-pitch windings in which the magnetic pole pitch is different from the coil pitch. As a result, compared to full-pitch windings, short-pitch windings, which allow the coil pitch to be variably set, make it easier to make the number of times that winding 30 passes through each slot 23 uniform.

[0073] Next, the operation of the rotating electric machine 1 according to the first embodiment will be described with reference to Figs. 7 to 9. Fig. 7 is a graph showing the time variation of induced voltage when the windings 30 of two identical phases are wound in different styles. Fig. 8 is a graph showing the time variation of induced voltage when the windings 30 of two identical phases are shifted by 180 electrical degrees from Fig. 7. Fig. 9 is a graph showing the time variation of induced voltage when the current flow direction of one phase is reversed from Fig. 8.

[0074] Although Figures 7 to 9 only show the case of the first U phase wire 31U and the second U phase wire 32U, the same applies to the case of the first V phase wire 31V and the second V phase wire 32V, and the case of the first W phase wire 31W and the second W phase wire 32W.

[0075] When a winding 30 is configured to have an odd number of turns, passing through each of the multiple slots 23 an odd number of times, it is difficult to arrange the windings 30 of the same phase in the same number within one slot 23. Therefore, as shown in Figure 5, the windings 30 of two of the same phases are wound in different styles, and the positive peaks of the induced voltage waveforms are usually offset from each other. When the positive peaks of the induced voltage waveforms are offset from each other, precise coordinated control of the first U-, V-, and W-phase wires 31U, 31V, and 31W and the second U-, V-, and W-phase wires 32U, 32V, and 32W is required to smoothly rotate the rotor 10, which makes the control design more difficult.

[0076] Therefore, the following concept is introduced as a concept in one aspect of the present invention. Specifically, as shown in FIG. 6 , the positive and negative peaks of two windings 30 of the same phase are shifted by 180 electrical degrees to coincide with each other. However, if the positive and negative peaks coincide with each other as shown in FIG. 6 , the induced voltages would be canceled out. Therefore, as shown in FIG. 7 , the negative peaks are reversed to positive peaks by reversing the current flow direction. This allows the peaks of two windings 30 of the same phase to coincide with each other even in a configuration with an odd number of turns, which would otherwise require the windings 30 of the same phase to have different configurations. In other words, a design can be implemented in which the phases of the same phases are matched.

[0077] Furthermore, when the power supply 2 is divided into two, even if there is a difference in performance between the two power supplies 2, by matching the phases of the same type, the positions of the positive and negative peaks of the induced voltage will match, so that the rotor 10 can continue to rotate smoothly without particularly difficult control. This means that it is not necessary to worry about using two power supplies 2 of different models, but more importantly, even if two power supplies 2 of the same model are used, it is not necessary to worry about performance differences due to deterioration over time caused by manufacturing variations between the two power supplies 2. Therefore, this makes a significant contribution to reducing the difficulty of control design that takes deterioration over time into account (initial control design, learning control design that monitors deterioration over time, etc.).

[0078] <Second Example>

[0079] Next, the configuration of a rotating electric machine 1 according to a second embodiment will be described with reference to FIGS. 10 to 14. FIG. 10 is a configuration diagram showing the rotating electric machine 1 as viewed from the anti-lead wire side. FIG. 11 is a configuration diagram showing the rotating electric machine 1 as viewed from the anti-lead wire side when the winding 30 is full-pitch wound. FIG. 12 is a development view of the winding 30 in FIG. 11 as viewed from the outer periphery with the anti-lead wire side facing up. FIG. 13 is a configuration diagram showing the rotating electric machine 1 as viewed from the anti-lead wire side when the winding 30 is fractional-pitch wound. FIG. 14 is a configuration diagram of the winding 30 in FIG. 13. Note that, below, components similar to those in the first embodiment described above are designated by the same reference numerals, and duplicated explanations will be omitted where appropriate.

[0080] 10, 11, and 13, a circle with an x ​​inside it indicates that the winding 30 is wound from the front to the back, and a current flows from the front to the back. A circle with a black dot inside it indicates that the winding 30 is wound from the back to the front, and a current flows from the back to the front.

[0081] The plurality of slots 23 are configured so that the winding 30 passes through each of them an even number of times. Here, the stator 20 is configured so that the winding 30 passes through each of the plurality of slots 23 four times. This minimizes the number of windings and improves manufacturability. That is, one aspect of the present invention is particularly advantageous in such cases, making it easier to make the number of passes of the winding 30 through each slot 23 uniform.

[0082] First, a case where the winding 30 is a full-pitch winding will be described with reference to Figures 10 to 12. Note that Figures 11 and 12 only show the first three-phase coil 31, and the second three-phase coil 32 is the same as the first three-phase coil 31 and is therefore not shown.

[0083] 10 and 12, the first U phase wire 31U is wound around a plurality of slots 23. The first U phase wire 31U has a pair of first windings 31U1, a pair of second windings 31U2, a pair of third windings 31U3, and a pair of fourth windings 31U4. The first winding 31U1, the second winding 31U2, the third winding 31U3, and the fourth winding 31U4 are each wound around the same slot 23 twice.

[0084] The first winding 31U1 is formed by winding a winding 30 input from a first U-phase lead wire U1in connected to a three-phase AC power supply (not shown) between the first slot 23a and the seventh slot 23g. The second winding 31U2 is formed by winding a winding 30 between the second slot 23b and the eighth slot 23h, continuing from the first winding 31U1 wound in the seventh slot 23g.

[0085] The third winding 31U3 is wound between the thirteenth slot 23m and the nineteenth slot 23s, continuing from the second winding 31U2 wound in the eighth slot 23h. The fourth winding 31U4 is wound between the fourteenth slot 23n and the twentieth slot 23t, continuing from the third winding 31U3 wound in the nineteenth slot 23s.

[0086] Thus, the first U phase wire 31U has a first coil 31UA that is wound between the first slot 23a and the seventh slot 23g, and then wound between the second slot 23b and the eighth slot 23h, and a second coil 31UB that is wound between the thirteenth slot 23m and the nineteenth slot 23s, and then wound between the fourteenth slot 23n and the twentieth slot 23t.

[0087] The first V-phase wire 31V has a pair of first windings 31V1, a pair of second windings 31V2, a pair of third windings 31V3, and a pair of fourth windings 31V4. The first windings 31V1, the second windings 31V2, the third windings 31V3, and the fourth windings 31V4 are each wound twice around the same slot 23.

[0088] The first winding 31V1 is formed by winding a winding 30 input from a first V-phase lead wire V1in connected to a three-phase AC power supply between the fifth slot 23e and the eleventh slot 23k. The second winding 31V2 is formed by winding a winding 30 between the sixth slot 23f and the twelfth slot 23l, continuing from the first winding 31V1 wound in the eleventh slot 23k.

[0089] The third winding 31V3 is wound between the seventeenth slot 23q and the twenty-third slot 23w, continuing from the second winding 31V2 wound in the twelfth slot 23l. The fourth winding 31V4 is wound between the eighteenth slot 23r and the twenty-fourth slot 24x, continuing from the third winding 31V3 wound in the twenty-third slot 23w.

[0090] In this way, the first V-phase wire 31V has a first coil 31VA that is wound between the fifth slot 23e and the eleventh slot 23k, and then wound between the sixth slot 23f and the twelfth slot 23l, and a second coil 31VB that is wound between the seventeenth slot 23q and the twenty-third slot 23w, and then wound between the eighteenth slot 23r and the twenty-fourth slot 23x.

[0091] The first W-phase wire 31W has a pair of first windings 31W1, a pair of second windings 31W2, a pair of third windings 31W3, and a pair of fourth windings 31W4. The first windings 31W1, the second windings 31W2, the third windings 31W3, and the fourth windings 31W4 are each wound twice around the same slot 23.

[0092] The first winding 31W1 is formed by winding the winding 30 input from the first W-phase lead wire W1in connected to the three-phase AC power supply between the ninth slot 23i and the fifteenth slot 23o. The second winding 31W2 is formed by winding the winding 30 between the tenth slot 23j and the sixteenth slot 23p, continuing from the first winding 31W1 wound in the fifteenth slot 23o.

[0093] The third winding 31W3 is wound between the 21st slot 23u and the 3rd slot 23c, continuing from the second winding 31W2 wound in the 16th slot 23p. The fourth winding 31W4 is wound between the 22nd slot 23v and the 4th slot 23d, continuing from the third winding 31W3 wound in the 3rd slot 23c.

[0094] In this way, the first W phase wire 31W has a first coil 31WA that is wound between the ninth slot 23i and the fifteenth slot 23o, and then wound between the tenth slot 23j and the sixteenth slot 23p, and a second coil 31WB that is wound between the twenty-first slot 23u and the third slot 23c, and then wound between the twenty-second slot 23v and the fourth slot 23d.

[0095] The second U phase wire 32U is wound in a plurality of slots 23. The second U phase wire 32U passes through the same slots 23 the same number of times as the first U phase wire 31U and is wound so that the current flow directions are the same, so a detailed description thereof will be omitted here.

[0096] The second V phase wire 32V is wound in a plurality of slots 23. The second V phase wire 32V passes through the same slots 23 the same number of times as the first V phase wire 31V and is wound so that the current passing directions are the same, so a detailed description will be omitted here.

[0097] The second W phase wire 32W is wound in a plurality of slots 23. The second W phase wire 32W passes through the same slots 23 the same number of times as the first W phase wire 31W and is wound so that the current flow directions are the same, so a detailed description will be omitted here.

[0098] As shown in FIG. 2, first U-phase wire 31U, first V-phase wire 31V, first W-phase wire 31W, second U-phase wire 32U, second V-phase wire 32V, and second W-phase wire 32W are configured as full-pitch windings in which the magnetic pole pitch is the same as the coil pitch.

[0099] Next, a case where the winding 30 is a fractional-pitch winding will be described with reference to Figures 10, 13, and 14. Figures 13 and 14 show only the first three-phase coil 31, and the second three-phase coil 32 is similar to the first three-phase coil 31 and is therefore not shown.

[0100] 10 and 14, the first U phase wire 31U is wound around a plurality of slots 23. The first U phase wire 31U has a pair of first windings 31U1, a pair of second windings 31U2, a pair of third windings 31U3, and a pair of fourth windings 31U4. The first winding 31U1, the second winding 31U2, the third winding 31U3, and the fourth winding 31U4 are each wound around the same slot 23 twice.

[0101] The first winding 31U1 is formed by winding a winding 30 input from a first U-phase lead wire U1in connected to a three-phase AC power supply (not shown) between the first slot 23a and the twentieth slot 23t. The second winding 31U2 is formed by winding a winding 30 between the fourteenth slot 23n and the nineteenth slot 23s, continuing from the first winding 31U1 wound around the twentieth slot 23t.

[0102] The third winding 31U3 is wound between the thirteenth slot 23m and the eighth slot 23h, continuing from the second winding 31U2 wound in the nineteenth slot 23s. The fourth winding 31U4 is wound between the second slot 23b and the seventh slot 23g, continuing from the third winding 31U3 wound in the eighth slot 23h.

[0103] Thus, the first U phase wire 31U has a first coil 31UA that is wound between the first slot 23a and the twentieth slot 23t, and then wound between the fourteenth slot 23n and the nineteenth slot 23s, and a second coil 31UB that is wound between the thirteenth slot 23m and the eighth slot 23h, and then wound between the second slot 23b and the seventh slot 23g.

[0104] The first V-phase wire 31V has a pair of first windings 31V1, a pair of second windings 31V2, a pair of third windings 31V3, and a pair of fourth windings 31V4. The first windings 31V1, the second windings 31V2, the third windings 31V3, and the fourth windings 31V4 are each wound twice around the same slot 23.

[0105] The first winding 31V1 is formed by winding the winding 30 input from the first V-phase lead wire V1in connected to the three-phase AC power supply between the 21st slot 23u and the 16th slot 23p. The second winding 31V2 is formed by winding the winding 30 between the 10th slot 23j and the 15th slot 23o, continuing from the first winding 31V1 wound in the 16th slot 23p.

[0106] The third winding 31V3 is wound between the ninth slot 23i and the fourth slot 23d, continuing from the second winding 31V2 wound in the fifteenth slot 23o. The fourth winding 31V4 is wound between the twenty-second slot 23v and the third slot 24c, continuing from the third winding 31V3 wound in the fourth slot 23d.

[0107] In this way, the first V-phase wire 31V has a first coil 31VA that is wound between the 21st slot 23u and the 16th slot 23p, and then wound between the 10th slot 23j and the 15th slot 23o, and a second coil 31VB that is wound between the 9th slot 23i and the 4th slot 23d, and then wound between the 22nd slot 23v and the 3rd slot 23c.

[0108] The first W-phase wire 31W has a pair of first windings 31W1, a pair of second windings 31W2, a pair of third windings 31W3, and a pair of fourth windings 31W4. The first windings 31W1, the second windings 31W2, the third windings 31W3, and the fourth windings 31W4 are each wound twice around the same slot 23.

[0109] The first winding 31W1 is formed by winding the winding 30 input from the first W-phase lead wire W1in connected to the three-phase AC power supply between the seventeenth slot 23q and the twelfth slot 23l. The second winding 31W2 is formed by winding the winding 30 between the sixth slot 23f and the eleventh slot 23k, continuing from the first winding 31W1 wound in the twelfth slot 23l.

[0110] The third winding 31W3 is wound between the fifth slot 23e and the twenty-fourth slot 23x, continuing from the second winding 31W2 wound in the eleventh slot 23k. The fourth winding 31W4 is wound between the eighteenth slot 23r and the twenty-third slot 23w, continuing from the third winding 31W3 wound in the twenty-fourth slot 23x.

[0111] In this way, the first W phase wire 31W has a first coil 31WA that is wound between the 17th slot 23q and the 12th slot 23l, and then wound between the 6th slot 23f and the 11th slot 23k, and a second coil 31WB that is wound between the 5th slot 23e and the 24th slot 23x, and then wound between the 18th slot 23r and the 23rd slot 23w.

[0112] The second U phase wire 32U is wound in a plurality of slots 23. The second U phase wire 32U passes through the same slots 23 the same number of times as the first U phase wire 31U and is wound so that the current flow directions are the same, so a detailed description thereof will be omitted here.

[0113] The second V phase wire 32V is wound in a plurality of slots 23. The second V phase wire 32V passes through the same slots 23 the same number of times as the first V phase wire 31V and is wound so that the current passing directions are the same, so a detailed description will be omitted here.

[0114] The second W phase wire 32W is wound in a plurality of slots 23. The second W phase wire 32W passes through the same slots 23 the same number of times as the first W phase wire 31W and is wound so that the current flow directions are the same, so a detailed description will be omitted here.

[0115] 4, first U-phase wire 31U, first V-phase wire 31V, first W-phase wire 31W, second U-phase wire 32U, second V-phase wire 32V, and second W-phase wire 32W are configured as short-pitch windings in which the magnetic pole pitch is different from the coil pitch. As a result, compared to full-pitch windings, short-pitch windings, which allow the coil pitch to be variably set, make it easier to make the number of times that winding 30 passes through each slot 23 uniform.

[0116] Next, the operation of the rotating electrical machine 1 according to the second embodiment will be described.

[0117] When the windings 30 of two identical phases are wound in different styles, the positive peaks of the induced voltage waveforms typically differ from each other. When the positive peaks of the induced voltage waveforms differ from each other, precise coordinated control of the first U-, V-, and W-phase wires 31U, 31V, and 31W and the second U-, V-, and W-phase wires 32U, 32V, and 32W must be performed in order to smoothly rotate the rotor 10, which increases the difficulty of control design.

[0118] Therefore, by winding the windings 30 of the same phase in the same slot 23 with the same number of turns and the same current flow direction, it is possible to make the peaks of the induced voltage waveforms of the windings 30 of the same phase coincide with each other. In other words, it is possible to design the windings 30 of the same phase to be in phase with each other.

[0119] The configuration and effects of the present embodiment will now be described.

[0120] (1) The drive unit 100 includes a first battery 2a, a second battery 2b, a first inverter circuit 3a electrically connected to the first battery 2a via a first power supply line 5a, a second inverter circuit 3b electrically connected to the second battery 2b via a second power supply line 5b, a first U-phase wire 31U electrically connected to the first inverter circuit 3a, a first V-phase wire 31V electrically connected to the first inverter circuit 3a, and a first inverter circuit 3b. The inverter circuit 10 includes a first W-phase wire 31W electrically connected to the first inverter circuit 3b, a second U-phase wire 32U electrically connected to the second inverter circuit 3b, a second V-phase wire 32V electrically connected to the second inverter circuit 3b, a second W-phase wire 32W electrically connected to the second inverter circuit 3b, and a rotor 10 that rotates by a magnetic field generated by the first U-phase wire 31U, the first V-phase wire 31V, the first W-phase wire 31W, the second U-phase wire 32U, the second V-phase wire 32V, and the second W-phase wire 32W.

[0121] According to this configuration, it is possible to provide a unit having an excellent system when configuring the rotating electrical machine 1 having two three-phase coils (the first three-phase coil 31 and the second three-phase coil 32).

[0122] (2) The winding layout is designed so that the first U-phase wire 31U and the second U-phase wire 32U are in the same phase, the first V-phase wire 31V and the second V-phase wire 32V are in the same phase, and the first W-phase wire 31W and the second W-phase wire 32W are in the same phase.

[0123] According to this configuration, when the power supply 2 is divided into two, even if there is a difference in performance between the two power supplies 2, by matching the phases of the same type, the positions of the positive and negative peaks of the induced voltage will match, so that the rotor 10 can continue to rotate smoothly without particularly difficult control. This means that it is not necessary to worry about using two power supplies 2 of different models, but more importantly, even if two power supplies 2 of the same model are used, it is not necessary to worry about performance differences due to deterioration over time caused by manufacturing variations between the two power supplies 2. Therefore, this greatly contributes to reducing the difficulty of control design that takes into account deterioration over time (initial control design, learning control design that monitors deterioration over time, etc.).

[0124] (3) First U-phase wire 31U, first V-phase wire 31V, first W-phase wire 31W, second U-phase wire 32U, second V-phase wire 32V, and second W-phase wire 32W are wound around a common core (stator core 21) to form stator 20.

[0125] According to this configuration, the stator core 21 of the stator 20 is shared, which contributes to miniaturization and a reduction in the number of parts.

[0126] Although an embodiment of the present invention has been described above, the above embodiment merely shows one application example of the present invention, and is not intended to limit the technical scope of the present invention to the specific configuration of the above embodiment.

[0127] For example, "the winding 30 passes an odd or even number of times" does not only mean a single winding 30 passes an odd or even number of times, but also includes a winding 30 made up of a bundle of multiple conductors passing an odd or even number of times, or a winding 30 made up of a set of conductors wound multiple times passing an odd or even number of times. Therefore, regardless of the number of wires constituting the bundle or the number of multiple windings, as long as the bundle of conductors or the set of conductors passes an odd or even number of times, this falls under the category of a winding 30 passing an odd or even number of times.

[0128] Furthermore, the state where the winding 30 passes twice through the same slot 23 is the same as the state where two windings 30 are integrated and pass once through the slot 23. Therefore, the state where two windings 30 are integrated and pass once through the slot 23 corresponds to the state where the winding 30 passes twice through the slot 23.

[0129] REFERENCE SIGNS LIST 100 Drive unit (unit) 1 Rotating electric machine 2a First battery (first power source) 2b Second battery (second power source) 3a First inverter circuit 3b Second inverter circuit 10 Rotor (rotor, common rotor) 20 Stator (stator) 21 Stator core (common core) 23 Slot 31U First U phase wire 31V First V phase wire 31W First W phase wire 32U Second U phase wire 32V Second V phase wire 32W Second W phase wire

Claims

1. a first power source; A second power source; a first inverter circuit electrically connected to the first power supply via a first power supply line; a second inverter circuit electrically connected to the second power supply via a second power supply line; a first U-phase wire electrically connected to the first inverter circuit; a first V-phase wire electrically connected to the first inverter circuit; a first W phase wire electrically connected to the first inverter circuit; a second U-phase wire electrically connected to the second inverter circuit; a second V-phase wire electrically connected to the second inverter circuit; a second W-phase wire electrically connected to the second inverter circuit; a common rotor that rotates by a magnetic field generated by the first U-phase wire, the first V-phase wire, the first W-phase wire, the second U-phase wire, the second V-phase wire, and the second W-phase wire; Equipped with a winding layout designed so that the first U-phase wire and the second U-phase wire are in the same phase, a winding layout designed so that the first V-phase wire and the second V-phase wire are in the same phase, The winding layout is designed so that the first W-phase wire and the second W-phase wire are in the same phase. unit.

2. 2. The unit of claim 1, the first U-phase wire, the first V-phase wire, the first W-phase wire, the second U-phase wire, the second V-phase wire, and the second W-phase wire are wound around a common core to form a stator; unit.

3. a first power source; A second power source; a first inverter circuit electrically connected to the first power supply via a first power supply line; a second inverter circuit electrically connected to the second power supply via a second power supply line; a first U-phase wire electrically connected to the first inverter circuit; a first V-phase wire electrically connected to the first inverter circuit; a first W phase wire electrically connected to the first inverter circuit; a second U-phase wire electrically connected to the second inverter circuit; a second V-phase wire electrically connected to the second inverter circuit; a second W-phase wire electrically connected to the second inverter circuit; a common rotor that rotates by a magnetic field generated by the first U-phase wire, the first V-phase wire, the first W-phase wire, the second U-phase wire, the second V-phase wire, and the second W-phase wire; Equipped with the first inverter circuit and the second inverter circuit are controlled by a single controller; unit.