Unit

Abstract

Provided is a unit having an excellent system when configuring a rotating electrical machine having two three-phase coils. A 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 line (31U), a first V-phase line (31V), and a first W-phase line (31W) electrically connected to the first inverter circuit (3a); a second U-phase line (32U), a second V-phase line (32V), and a second W-phase line (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 line (31U), the first V-phase line (31V), the first W-phase line (31W), the second U-phase line (32U), the second V-phase line (32V), and the second W-phase line (32W).

Description

Technical Field

[0001] The present invention relates to units. Background Art

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

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2005-086879 Summary of the Invention

[0006] Technical problem to be solved by the invention

[0007] An object of the present invention is to provide a unit having an excellent system when configuring a rotating electrical machine having two three-phase coils.

[0008] Technical solutions to technical problems

[0009] According to one embodiment of the present invention, the unit includes: a first power supply; a second power supply; a first inverter circuit, which is electrically connected to the first power supply via a first power supply line; a second inverter circuit, which is electrically connected to the second power supply via a second power supply line; a first U-phase line, which is electrically connected to the first inverter circuit; a first V-phase line, which is electrically connected to the first inverter circuit; a first W-phase line, which is electrically connected to the first inverter circuit; a second U-phase line, which is electrically connected to the second inverter circuit; a second V-phase line, which is electrically connected to the second inverter circuit; a second W-phase line, which is electrically connected to the second inverter circuit; and a common rotor, which rotates by the magnetic field generated by the first U-phase line, the first V-phase line, the first W-phase line, the second U-phase line, the second V-phase line and the second W-phase line.

[0010] Effects of the Invention

[0011] According to one aspect of the present invention, it is possible to provide a unit having an excellent system when configuring a rotating electrical machine having two three-phase coils. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a diagram showing the configuration of units according to an embodiment of the present invention.

[0013] Figure 2 It is a diagram showing the configuration of a unit according to a modified example of the embodiment of the present invention.

[0014] Figure 3 This is a structural diagram showing the rotating electrical machine of the first embodiment as viewed from the opposite side to the lead wire.

[0015] Figure 4 is Figure 3 1 shows only the configuration of the first three-phase coil.

[0016] Figure 5 is Figure 3 1 shows only the configuration of the second three-phase coil.

[0017] Figure 6 This is a developed view of the winding in a rotating electrical machine, viewed from the inner circumference with the lead side facing upward.

[0018] Figure 7 This is a graph showing the temporal change in the induced voltage when two windings of the same phase are wound in different forms.

[0019] Figure 8 It means from Figure 7 This graph shows the temporal variation of the induced voltage when two windings of the same phase are offset by an electrical angle of 180 degrees.

[0020] Figure 9 It means from Figure 8 This graph shows the time variation of the induced voltage when the current flow direction of one phase is reversed.

[0021] Figure 10 This is a structural diagram showing a state in which the rotating electrical machine of the second embodiment is viewed from the opposite side to the lead wire.

[0022] Figure 11 This is a structural diagram showing the state of the rotating electrical machine when the winding is wound at a full pitch as viewed from the opposite side of the lead wire.

[0023] Figure 12 Therefore Figure 11 The opposite side of the winding lead is the expanded view observed from the outer periphery.

[0024] Figure 13 This is a structural diagram showing the state of the rotating electrical machine when the winding is wound with a short pitch as viewed from the opposite side of the lead wire.

[0025] Figure 14 yes Figure 13 The winding structure diagram in . DETAILED DESCRIPTION

[0026] Hereinafter, a rotary electric 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 with reference to the drawings.

[0027] First, refer to Figures 1 to 3 The structure of the drive unit 100 will be described. Figure 1 2 is a diagram showing the configuration of the drive unit 100 . Figure 22 is a diagram showing the configuration of a drive unit 100 according to a modified example. Figure 3 This is a structural diagram showing a state in which the rotating electrical machine 1 according to the first embodiment is viewed from the opposite side to the lead wire.

[0028] like Figure 1 As shown, drive unit 100 includes a rotating electric machine 1, a power supply 2, an inverter circuit 3 serving as a drive circuit, and a controller 4 serving as a control device. Drive unit 100 is mounted on, for example, a vehicle and generates a driving force for driving wheels (not shown) from rotating electric machine 1 using electric power supplied from power supply 2.

[0029] The rotating electric machine 1 includes 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.

[0030] like Figure 3 As shown, the rotating electrical machine 1 includes a rotor 10 as a rotor and a stator 20 as a stator. Here, the rotating electrical 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 Figure 4 and Figure 5 The rotating electrical machine 1 is mounted on a vehicle, for example, and can be used both as an electric motor that generates driving force and as a generator that generates regenerative power while not in a driving state. Hereinafter, the direction of the central axis of the rotating electrical machine 1 will be referred to as the "axial direction," the direction of rotation of the rotor 10 in the rotating electrical machine 1 will be referred to as the "circumferential direction," and the direction radially extending from the central axis of the rotating electrical machine 1 will be referred to as the "radial direction."

[0031] Rotor 10 includes rotor core 11, rotor shaft 12, and multiple permanent magnets 13. Rotor 10 is a common rotor rotated by magnetic fields generated by first U-phase line 31U, first V-phase line 31V, first W-phase line 31W, second U-phase line 32U, second V-phase line 32V, and second W-phase line 32W, which will be described later.

[0032] The rotor core 11 is formed in a substantially cylindrical shape extending in the axial direction. The rotor core 11 has a through hole extending therethrough in the axial direction. The rotor shaft 12 is provided in the through hole. The rotor core 11 is rotatably supported by the rotor shaft 12.

[0033] A plurality of permanent magnets 13 are housed in the rotor core 11. Here, four sets (eight magnets) of permanent magnets 13 are provided corresponding to four poles, but the number is not limited to this.

[0034] The stator 20 is a four-pole stator. It includes a stator core 21 serving as a common core and windings 30. The stator 20 is constructed by winding 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, described later, around the stator core 21.

[0035] The stator core 21 is formed into a generally cylindrical shape extending in the axial direction. A through-hole is provided in the stator core 21, extending in the axial direction. The rotor 10 is rotatably disposed in the through-hole. The stator core 21 has a plurality (here, 24) of teeth 22 and a plurality (here, 24) of slots 23.

[0036] The teeth 22 protrude radially inward from the inner peripheral surface of the stator core 21. The plurality of teeth 22 are arranged on the inner peripheral surface of the stator core 21 at equal intervals in the circumferential direction.

[0037] The slots 23 are formed between a pair of teeth 22 adjacent to each other in the circumferential direction. The slots 23 are open to the through-hole of the stator core 21. The plurality of slots 23 are arranged on the inner circumferential surface of the stator core 21 at equal intervals in the circumferential direction.

[0038] Specifically, the grooves 23 include a first groove 23a, a second groove 23b, a third groove 23c, a fourth groove 23d, a fifth groove 23e, a sixth groove 23f, a seventh groove 23g, an eighth groove 23h, a ninth groove 23i, a tenth groove 23j, an eleventh groove 23k, a twelfth groove 23l, a thirteenth groove 23m, a fourteenth groove 23n, a fifteenth groove 23o, a sixteenth groove 23p, a seventeenth groove 23q, an eighteenth groove 23r, a nineteenth groove 23s, a twentieth groove 23t, a twenty-first groove 23u, a twenty-second groove 23v, a twenty-third groove 23w, and a twenty-fourth groove 23x. The first to twenty-fourth grooves 23a to 23x are arranged in sequence adjacent to each other in the circumferential direction, and the twenty-fourth groove 23x is adjacent to the first groove 23a in the circumferential direction, and thus are arranged at equal intervals throughout the entire circumference.

[0039] The winding 30 includes a first three-phase coil 31 and a second three-phase coil 32 . That is, the rotating electrical 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 double three-phase winding.

[0040] The first three-phase coil 31 includes a first U-phase line 31U, a first V-phase line 31V, and a first W-phase line 31W. The first three-phase coil 31 forms a three-phase, four-pole coil. The second three-phase coil 32 includes a second U-phase line 32U, a second V-phase line 32V, and a second W-phase line 32W. The second three-phase coil 32 forms a three-phase, four-pole coil. The first U-phase line 31U, the first V-phase line 31V, the first W-phase line 31W, the second U-phase line 32U, the second V-phase line 32V, and the second W-phase line 32W are electrically isolated from each other.

[0041] The first U-phase line 31U and the second U-phase line 32U are designed to have the same phase winding layout. The first V-phase line 31V and the second V-phase line 32V are designed to have the same phase winding layout. The first W-phase line 31W and the second W-phase line 32W are designed to have the same phase winding layout.

[0042] Designing a winding layout with the same phase means that the peak (vertex) positions of the induced voltage waveforms of the same type of windings 30 (the pair of the first U-phase line 31U and the second U-phase line 32U, the pair of the first V-phase line 31V and the second V-phase line 32V, and the pair of the first W-phase line 31W and the second W-phase line 32W) are aligned when the periods are equal. In this case, the amplitude (peak size) depends on the supplied current and therefore does not necessarily need to be aligned. For the specific structure of the winding 30 in the rotating electrical machine 1, refer to Figures 3 to 14 Details will be given later.

[0043] The power source 2 has a first battery 2a as a first power source and a second battery 2b as a second power source.

[0044] The first battery 2 a is a secondary battery that supplies electric power to the first three-phase coil 31 when the rotary electric machine 1 operates as an electric motor and stores regenerative electric power from the first three-phase coil 31 when the rotary electric machine 1 operates as a generator.

[0045] The second battery 2 b is a secondary battery that supplies electric power to the second three-phase coil 32 when the rotating electrical machine 1 operates as an electric motor and stores regenerative electric power from the second three-phase coil 32 when the rotating electrical machine 1 operates as a generator.

[0046] The inverter circuit 3 includes a first inverter circuit 3 a and a second inverter circuit 3 b .

[0047] The first inverter circuit 3a is electrically connected to the first battery 2a via a first power supply line 5a. The first inverter circuit 3a is electrically connected to a first U-phase line 31U, a first V-phase line 31V, and a first W-phase line 31W via a first U-phase lead U1in, a first V-phase lead V1in, and a first W-phase lead W1in. Although not shown, the first inverter circuit 3a includes multiple IGBTs (Insulated Gate Bipolar Transistors) as switching elements and a smoothing capacitor.

[0048] 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 line 32U, the second U-phase line 32V, and the second W-phase line 32W via a second U-phase lead U2in, a second V-phase lead V2in, and a second W-phase lead W2in. Although not shown, the first inverter circuit 3a includes multiple switching elements, such as IGBTs (Insulated Gate Bipolar Transistors), and a smoothing capacitor.

[0049] The first power line 5a and the second power line 5b are electrically isolated. The first power line 5a is provided with a first relay circuit 6a capable of disconnecting from the first battery 2a. The second power line 5b is provided with a second relay circuit 6b capable of disconnecting from the second battery 2b.

[0050] The controller 4 includes a first controller 4 a and a second controller 4 b .

[0051] The first controller 4a controls the first inverter circuit 3a. Specifically, the first controller 4a switches the multiple IGBTs of the first inverter circuit 3a on and off to convert DC power supplied from the first battery 2a into three-phase AC power for driving the first three-phase coils 31 of the rotating electrical machine 1. Furthermore, the first controller 4a switches the multiple IGBTs of the first inverter circuit 3a on and off to convert regenerative power (three-phase AC power) from the first three-phase coils 31 of the rotating electrical machine 1 into DC power capable of charging the first battery 2a.

[0052] The second controller 4b controls the second inverter circuit 3b. Specifically, the second controller 4b switches the multiple IGBTs of the second inverter circuit 3b on and off to convert DC power supplied from the second battery 2b into three-phase AC power for driving the second three-phase coils 32 of the rotating electrical machine 1. Furthermore, the second controller 4b switches the multiple IGBTs of the second inverter circuit 3b on and off to convert regenerative power (three-phase AC power) from the second three-phase coils 32 of the rotating electrical machine 1 into DC power capable of charging the second battery 2b.

[0053] In this manner, by providing the controller 4 separately as the first controller 4a and the second controller 4b, the first controller 4a and the second controller 4b can be arranged at different positions, thereby improving the layout in the vehicle.

[0054] Not limited to this, you can also Figure 2As shown in the modified example, the first inverter circuit 3a and the second inverter circuit 3b are controlled by a single controller 4. When a single controller 4 is provided, the drive unit 100 can be miniaturized and the number of parts can be reduced.

[0055] Here, the inverter circuit 3 (IGBT and smoothing capacitor components) can be shared by the first U-, V-, and W-phase lines 31U, 31V, and 31W, and the second U-, V-, and W-phase lines 32U, 32V, and 32W, or they can be provided separately. Sharing the inverter circuit 3 offers the advantage of reducing the number of parts. On the other hand, providing separate inverter circuits 3 can reduce the current drawn by each line compared to sharing the inverter circuit 3. Specifically, while sharing the inverter circuit 3 requires supplying both the current required for the first U-phase line 31U and the current required for the second U-phase line 32U via a single wiring line, providing separate inverter circuits 3 allows the wiring to be divided into the first power supply line 5a and the second power supply line 5b, reducing the current drawn by the single wiring line. In one embodiment of the present invention, the latter approach is chosen to achieve the advantage of reduced current.

[0056] In addition, when the inverter circuits 3 are provided separately, the power supply 2 of each inverter circuit 3 can be shared or provided separately. When the power supply 2 of each inverter circuit 3 is shared, the advantage of reducing the number of parts can be enjoyed. On the other hand, when the power supply 2 of each inverter circuit 3 is provided separately, the amount of current can be reduced compared to the case of sharing the power supply 2. That is, when the power supply 2 of the inverter circuit 3 is shared, for example, the amount of current required for the two inverter circuits 3 needs to be supplied through one wiring, but if the power supply 2 of the inverter circuit 3 is provided separately, the wiring can be divided into the first power supply line 5a and the second power supply line 5b, which can reduce the amount of current supplied to the one wiring. In one embodiment of the present invention, the latter advantage of reducing the amount of current is selected.

[0057] Thus, before sacrificing the number of parts, the maximum current flowing in the drive unit 100 can be reduced by intentionally dividing the inverter circuit 3 and the power supply 2 into multiple parts and electrically isolating them, and also dividing various wirings into multiple parts and electrically isolating them.

[0058] When the voltage exceeds a certain specified value, regulations may necessitate strong current countermeasures, requiring a reduction in the operating voltage (e.g., 48V) under certain conditions. Even in such cases, if the torque (output) of the rotating electrical machine 1 is required, the current must be increased to improve output. In such situations, applying one aspect of the present invention can reduce the peak current by separating the power supply 2, inverter circuit 3, and wiring (first power line 5a and second power line 5b). This aspect of the present invention is particularly useful in such situations.

[0059] Next, an embodiment of the rotary electric machine 1 applicable to the drive unit 100 will be described.

[0060] <First embodiment>

[0061] First, refer to Figures 3 to 6 The structure of the rotating electrical machine 1 according to the first embodiment will be described. Figure 3 It is a structural diagram showing a state in which the rotating electrical machine 1 is viewed from the opposite side to the lead wire. Figure 4 is Figure 3 2 shows only the configuration of the first three-phase coil 31. Figure 5 is Figure 3 2 shows only the configuration of the second three-phase coil 32 . Figure 6 It is a development view of the winding 30 viewed from the inner circumference with the lead wire side facing upward in the rotating electrical machine 1 .

[0062] exist Figures 3 to 5 In the diagram, a circle with an × in it indicates that the winding 30 is wound from the front to the back, and the current flows from the front to the back. A circle with a ● in it indicates that the winding 30 is wound from the back to the front, and the current flows from the back to the front.

[0063] Each of the plurality of slots 23 is configured so that the winding 30 passes through 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. Specifically, one aspect of the present invention is particularly effective in such situations, making it easier to achieve a uniform number of windings 30 passing through each slot 23.

[0064] like Figure 3 and Figure 5 As shown, the first U-phase line 31U is wound around the plurality of slots 23. The first U-phase line 31U includes 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.

[0065] The first winding 31U1 is formed by winding the winding 30, which is input from the first U-phase lead U1in connected to a three-phase AC power supply (not shown), between the 13th slot 23m and the 8th slot 23h. The second winding 31U2 is formed by continuously winding the first winding 31U1, which is wound around the 8th slot 23h, between the 13th slot 23m and the 8th slot 23h. The third winding 31U3 is formed by continuously winding the second winding 31U2, which is wound around the 8th slot 23h, between the 12th slot 23l and the 7th slot 23g.

[0066] The fourth winding 31U4 is formed by continuously winding the third winding 31U3 wound around the seventh slot 23g between the first slot 23a and the 20th slot 23t. The fifth winding 31U5 is formed by continuously winding the fourth winding 31U4 wound around the 20th slot 23t between the first slot 23a and the 20th slot 23t. The sixth winding 31U6 is formed by continuously winding the fifth winding 31U5 wound around the 20th slot 23t between the 24th slot 23x and the 19th slot 23s. After winding around the 19th slot 23s, the sixth winding 31U6 is connected to the first neutral point Mid1.

[0067] Thus, the first U-phase line 31U includes: a first coil 31UA, which is wound twice between the 13th slot 23m and the 8th slot 23h, and once between the 12th slot 23l and the 7th slot 23g; and a second coil 31UB, which is wound twice between the 1st slot 23a and the 20th slot 23t, and once between the 24th slot 23x and the 19th slot 23s.

[0068] The first V-phase line 31V includes 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 .

[0069] The first winding 31V1 is formed by winding the winding 30 input from the first V-phase lead V1in connected to the three-phase AC power supply between the 17th slot 23q and the 12th slot 23l. The second winding 31V2 is formed by continuously winding the first winding 31V1 wound around the 12th slot 23l between the 17th slot 23q and the 12th slot 23l. The third winding 31V3 is formed by continuously winding the second winding 31V2 wound around the 12th slot 23l between the 16th slot 23p and the 11th slot 23k.

[0070] The fourth winding 31V4 is formed by continuously winding the third winding 31V3 wound around the 11th slot 23k between the 5th slot 23e and the 24th slot 24x. The fifth winding 31V5 is formed by continuously winding the fourth winding 31V4 wound around the 24th slot 23x between the 5th slot 23e and the 24th slot 23x. The sixth winding 31V6 is formed by continuously winding the fifth winding 31V5 wound around the 24th slot 23x between the 4th slot 23d and the 23rd slot 23w. After being wound around the 23rd slot 23w, the sixth winding 31V6 is connected to the first neutral point Mid1.

[0071] Thus, the first V-phase line 31V includes: a first coil 31VA, which is wound twice between the 17th slot 23q and the 12th slot 23l, and once between the 16th slot 23p and the 11th slot 23k; and a second coil 31VB, which is wound twice between the 5th slot 23e and the 24th slot 23x, and once between the 4th slot 23d and the 23rd slot 23w.

[0072] The first W-phase line 31W includes 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 .

[0073] The first winding 31W1 is formed by winding the winding 30 input from the first W-phase lead 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 continuously winding the first winding 31W1 wound around the 16th slot 23p between the 21st slot 23u and the 16th slot 23p. The third winding 31W3 is formed by continuously winding the second winding 31W2 wound around the 16th slot 23p between the 20th slot 23t and the 15th slot 23o.

[0074] The fourth winding 31W4 is formed by continuously winding the third winding 31W3 wound around the 15th slot 23o between the 9th slot 23i and the 4th slot 24d. The fifth winding 31W5 is formed by continuously winding the fourth winding 31W4 wound around the 4th slot 23d between the 9th slot 23i and the 4th slot 23d. The sixth winding 31W6 is formed by continuously winding the fifth winding 31W5 wound around the 4th slot 23d between the 8th slot 23h and the 3rd slot 23c. After being wound around the 3rd slot 23c, the sixth winding 31W6 is connected to the first neutral point Mid1.

[0075] Thus, the first W-phase wire 31W includes a first coil 31WA wound twice between the 21st slot 23u and the 16th slot 23p, and once between the 20th slot 23t and the 15th slot 23o; and a second coil 31WB wound twice between the 9th slot 23i and the 4th slot 23d, and once between the 8th slot 23h and the 3rd slot 23c.

[0076] like Figure 3 and Figure 6 As shown, the second U-phase line 32U is wound around the plurality of slots 23. The second U-phase line 32U includes 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.

[0077] The first winding 32U1 is formed by winding the winding 30 input from the second U-phase lead U2in connected to the three-phase AC power supply between the 13th slot 23m and the 18th slot 23r. The second winding 32U2 is formed by continuously winding the first winding 32U1 wound around the 18th slot 23r between the 14th slot 23n and the 19th slot 23s. The third winding 32U3 is formed by continuously winding the second winding 32U2 wound around the 19th slot 23s between the 14th slot 23n and the 19th slot 23s.

[0078] The fourth winding 32U4 is formed by continuously winding the third winding 32U3 wound around the 19th slot 23s between the 1st slot 23a and the 6th slot 23f. The fifth winding 32U5 is formed by continuously winding the fourth winding 32U4 wound around the 6th slot 23f between the 2nd slot 23b and the 7th slot 23g. The sixth winding 32U6 is formed by continuously winding the fifth winding 32U5 wound around the 7th slot 23g between the 2nd slot 23b and the 7th slot 23g. After winding around the 7th slot 23g, the sixth winding 32U6 is connected to the second neutral point Mid2.

[0079] Thus, the second U-phase line 32U includes: a first coil 32UA, which is wound once between the 13th slot 23m and the 18th slot 23r, and is wound twice between the 14th slot 23n and the 19th slot 23s; and a second coil 32UB, which is wound once between the 1st slot 23a and the 6th slot 23f, and is wound twice between the 2nd slot 23b and the 7th slot 23g.

[0080] In addition, if Figure 6 As shown, the second U-phase wire 32U is wound around a slot position where the current flow direction is reversed with respect to the first U-phase wire 31U and the electrical angle is shifted by 180 degrees (mechanical angle 90 degrees).

[0081] The second V-phase line 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 .

[0082] The first winding 32V1 is formed by winding the winding 30 input from the second V-phase lead 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 continuously winding the first winding 32V1 wound around the 22nd slot 23v between the 18th slot 23r and the 23rd slot 23w. The third winding 32V3 is formed by continuously winding the second winding 32V2 wound around the 23rd slot 23w between the 18th slot 23r and the 23rd slot 23w.

[0083] The fourth winding 32V4 is formed by continuously winding the third winding 32V3 wound around the 23rd slot 23w between the 5th slot 23e and the 10th slot 24j. The fifth winding 32V5 is formed by continuously winding the fourth winding 32V4 wound around the 10th slot 23j between the 6th slot 23f and the 11th slot 23k. The sixth winding 32V6 is formed by continuously winding the fifth winding 32V5 wound around the 11th slot 23k between the 6th slot 23f and the 11th slot 23k. After being wound around the 11th slot 23k, the sixth winding 32V6 is connected to the second neutral point Mid2.

[0084] Thus, the second V-phase line 32V includes a first coil 32VA 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 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.

[0085] In addition, if Figure 6 As shown, the second V-phase line 32V is wound around a slot position where the current flow direction is reversed with respect to the first V-phase line 31V and the electrical angle is shifted by 180 degrees (mechanical angle 90 degrees).

[0086] The second W-phase line 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 .

[0087] The first winding 32W1 is formed by winding the winding 30 input from the second W-phase lead W2in connected to the three-phase AC power supply, wound between the 21st slot 23u and the 2nd slot 23b. The second winding 32W2 is formed by continuously winding the first winding 32W1 wound around the second slot 23b between the 22nd slot 23v and the 3rd slot 23c. The third winding 32W3 is formed by continuously winding the second winding 32W2 wound around the third slot 23c between the 22nd slot 23v and the 3rd slot 23c.

[0088] The fourth winding 32W4 is formed by continuously winding the third winding 32W3 wound around the third slot 23c between the ninth slot 23i and the fourteenth slot 24n. The fifth winding 32W5 is formed by continuously winding the fourth winding 32W4 wound around the fourteenth slot 23n between the tenth slot 23j and the fifteenth slot 23o. The sixth winding 32W6 is formed by continuously winding the fifth winding 32W5 wound around the fifteenth slot 23o between the tenth slot 23j and the fifteenth slot 23o. After being wound around the fifteenth slot 23o, the sixth winding 32W6 is connected to the second neutral point Mid2.

[0089] Thus, the second W-phase wire 32W includes a first coil 32WA wound once between the 21st slot 23u and the 2nd slot 23b, and wound twice between the 22nd slot 23v and the 3rd slot 23c; and a second coil 32WB 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.

[0090] In addition, if Figure 6 As shown, the second W-phase wire 32W is wound at a slot position where the current flow direction is reversed with respect to the first W-phase wire 31W and the electrical angle is shifted by 180 degrees.

[0091] like Figure 4 and Figure 5 As shown, 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 are configured as short-pitch windings in which the magnetic pole pitch and the coil pitch differ. Therefore, compared to full-pitch winding, short-pitch winding, in which the coil pitch can be variably set, makes it easier to make the number of passes of the winding 30 in each slot 23 uniform.

[0092] Next, refer to Figures 7 to 9 The operation of the rotating electrical machine 1 according to the first embodiment will be described. Figure 7 This is a graph showing the temporal change in the induced voltage when two windings 30 of the same phase are wound in different forms. Figure 8 It means from Figure 7 This is a graph showing the temporal change in the induced voltage when two windings 30 of the same phase are offset from each other by an electrical angle of 180 degrees. Figure 9 It means from Figure 8 This graph shows the time variation of the induced voltage when the current flow direction of one phase is reversed.

[0093] It should be noted that in Figures 7 to 9 , only the first U-phase line 31U and the second U-phase line 32U are shown, but the same also applies to the first V-phase line 31V and the second V-phase line 32V, and the first W-phase line 31W and the second W-phase line 32W.

[0094] If the winding 30 is configured to pass through the plurality of slots 23 an odd number of times with an odd number of turns, it is difficult to unify the number of windings 30 of the same phase into the same number within one slot 23. Figure 5 As shown, two windings 30 of the same phase are typically wound differently, resulting in the positive peaks of the dielectric voltage waveform being offset from each other. When the positive peaks of the dielectric voltage waveform are offset from each other, smooth rotation of the rotor 10 requires precise coordination of control of the first U, V, and W phase lines 31U, 31V, and 31W with control of the second U, V, and W phase lines 32U, 32V, and 32W, increasing the difficulty of control design.

[0095] Therefore, as a concept in one embodiment of the present invention, the following concept is introduced. Figure 6 As shown in FIG, by staggering the two windings 30 of the same phase by 180 degrees electrical angle, the positive vertex and the negative vertex are made to coincide. Figure 6 As shown in , when the positive vertex coincides with the negative vertex, the induced voltage is canceled. Figure 7 As shown, by reversing the direction of current flow, the negative vertex is reversed to a positive vertex. Thus, even in a configuration where two windings 30 of the same phase must have different odd-number turns, the vertices of the two windings 30 of the same phase can be aligned. In other words, the phases of the same phases can be designed to be aligned.

[0096] Furthermore, when power source 2 is split into two, even if there is a performance difference between the two power sources 2, aligning the phases of the same type aligns the positions of the positive and negative peaks of the induced voltage. This allows the rotor 10 to continue rotating smoothly without requiring particularly difficult control. This eliminates the need to use two different types of power sources 2. More importantly, even when using two power sources 2 of the same type, there is no concern about performance differences over time due to manufacturing variations between the two power sources 2. This significantly reduces the complexity of control designs that anticipate performance degradation over time (for example, initial control design and learning control designs that monitor performance degradation over time).

[0097] <Second embodiment>

[0098] Next, refer to Figures 10 to 14 The structure of the rotating electrical machine 1 according to the second embodiment will be described. Figure 10 It is a structural diagram showing a state in which the rotating electrical machine 1 is viewed from the opposite side to the lead wire. Figure 11 This is a structural diagram showing the state of the rotating electrical machine 1 when the winding 30 is wound at a full pitch, as viewed from the opposite side to the lead wire. Figure 12 Therefore Figure 11The side opposite to the lead wire of the winding 30 in FIG. 1 is a development view viewed from the outer periphery. Figure 13 This is a structural diagram showing the state of the rotary electric machine 1 when the winding 30 is wound in a short pitch as viewed from the opposite side to the lead wire. Figure 14 yes Figure 13 30 in the winding. In addition, the same reference numerals are attached to the same structures as those in the first embodiment, and repeated descriptions are omitted as appropriate.

[0099] exist Figure 10 、 Figure 11 as well as Figure 13 In the diagram, a circle with an × indicates that the winding 30 is wound from the front to the back and the current flows from the front to the back. A circle with a ● indicates that the winding 30 is wound from the back to the front and the current flows from the back to the front.

[0100] Each of the plurality of slots 23 is configured so that the winding 30 passes through 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. In other words, one aspect of the present invention is particularly effective in such situations, making it easier to achieve a uniform number of windings 30 passing through each slot 23.

[0101] First, refer to Figures 10 to 12 The case where the winding 30 is wound at full pitch will be described. Figure 11 and Figure 12 , only the first three-phase coil 31 is shown, and the second three-phase coil 32 is omitted from the illustration because it is the same as the first three-phase coil 31 .

[0102] like Figure 10 and Figure 12 As shown, the first U-phase line 31U is wound around a plurality of slots 23. The first U-phase line 31U includes 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 twice in the same slot 23.

[0103] The first winding 31U1 is formed by winding the winding 30 input from the first U-phase lead 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 the first winding 31U1 wound around the seventh slot 23g continuously between the second slot 23b and the eighth slot 23h.

[0104] The third winding 31U3 is wound continuously from the second winding 31U2 wound around the 8th slot 23h between the 13th slot 23m and the 19th slot 23s. The fourth winding 31U4 is wound continuously from the third winding 31U3 wound around the 19th slot 23s between the 14th slot 23n and the 20th slot 23t.

[0105] Thus, the first U-phase wire 31U includes a first coil 31UA that is wound between the 1st slot 23a and the 7th slot 23g, and then wound between the 2nd slot 23b and the 8th slot 23h; and a second coil 31UB that is wound between the 13th slot 23m and the 19th slot 23s, and then wound between the 14th slot 23n and the 20th slot 23t.

[0106] The first V-phase line 31V includes 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 winding 31V1, the second winding 31V2, the third winding 31V3, and the fourth winding 31V4 are each wound twice in the same slot 23.

[0107] The first winding 31V1 is formed by winding the winding 30 input from the first V-phase lead V1in connected to the three-phase AC power supply between the fifth slot 23e and the eleventh slot 23k. The second winding 31V2 is formed by winding the first winding 31V1 wound around the eleventh slot 23k continuously between the sixth slot 23f and the twelfth slot 23l.

[0108] The third winding 31V3 is formed by continuously winding the second winding 31V2 wound around the 12th slot 231 between the 17th slot 23q and the 23rd slot 23w. The fourth winding 31V4 is formed by continuously winding the third winding 31V3 wound around the 23rd slot 23w between the 18th slot 23r and the 24th slot 24x.

[0109] Thus, the first V-phase wire 31V includes a first coil 31VA wound between the fifth slot 23e and the eleventh slot 23k and then between the sixth slot 23f and the twelfth slot 23l; and a second coil 31VB wound between the seventeenth slot 23q and the twenty-third slot 23w and then between the eighteenth slot 23r and the twenty-fourth slot 23x.

[0110] The first W-phase line 31W includes 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 winding 31W1, the second winding 31W2, the third winding 31W3, and the fourth winding 31W4 are each wound twice in the same slot 23.

[0111] The first winding 31W1 is formed by winding the winding 30 input from the first W-phase lead W1in connected to the three-phase AC power supply between the 9th slot 23i and the 15th slot 23o. The second winding 31W2 is formed by winding the first winding 31W1 wound around the 15th slot 23o continuously between the 10th slot 23j and the 16th slot 23p.

[0112] The third winding 31W3 is formed by continuously winding the second winding 31W2 wound around the 16th slot 23p between the 21st slot 23u and the 3rd slot 23c. The fourth winding 31W4 is formed by continuously winding the third winding 31W3 wound around the 3rd slot 23c between the 22nd slot 23v and the 4th slot 24d.

[0113] Thus, the first W-phase wire 31W includes a first coil 31WA that is wound between the 9th slot 23i and the 15th slot 23o, and then between the 10th slot 23j and the 16th slot 23p; and a second coil 31WB that is wound between the 21st slot 23u and the 3rd slot 23c, and then between the 22nd slot 23v and the 4th slot 23d.

[0114] The second U-phase wire 32U is wound around a plurality of slots 23. The second U-phase wire 32U is wound so as to pass through the same slots 23 as the first U-phase wire 31U the same number of times and in the same direction of current flow, and therefore detailed description thereof is omitted.

[0115] The second V-phase wire 32V is wound around the plurality of slots 23. The second V-phase wire 32V is wound so as to pass through the same slots 23 as the first V-phase wire 31V the same number of times and in the same direction of current flow, and therefore detailed description thereof is omitted.

[0116] The second W-phase wire 32W is wound around the plurality of slots 23. The second W-phase wire 32W is wound so as to pass through the same slots 23 as the first W-phase wire 31W the same number of times and in the same direction of current flow, and therefore detailed description is omitted here.

[0117] like Figure 2 As shown, the first U-phase line 31U, the first V-phase line 31V, the first W-phase line 31W, the second U-phase line 32U, the second V-phase line 32V, and the second W-phase line 32W are wound in full pitch with the magnetic pole pitch being the same as the coil pitch.

[0118] Next, refer to Figure 10 、 Figure 13 as well as Figure 14 The case where the winding 30 is wound with a short pitch will be described. Figure 13 and Figure 14 Only the first three-phase coil 31 is shown in FIG. 2 , and the second three-phase coil 32 is the same as the first three-phase coil 31 and thus is omitted from the illustration.

[0119] like Figure 10 and Figure 14 As shown, the first U-phase line 31U is wound around a plurality of slots 23. The first U-phase line 31U includes 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 twice in the same slot 23.

[0120] The first winding 31U1 is formed by winding the winding 30 input from the first U-phase lead U1in connected to a three-phase AC power supply (not shown) between the first slot 23a and the 20th slot 23t. The second winding 31U2 is formed by winding the first winding 31U1 wound around the 20th slot 23t continuously between the 14th slot 23n and the 19th slot 23s.

[0121] The third winding 31U3 is wound continuously from the second winding 31U2 wound around the 19th slot 23s between the 13th slot 23m and the 8th slot 23h. The fourth winding 31U4 is wound continuously from the third winding 31U3 wound around the 8th slot 23h between the 2nd slot 23b and the 7th slot 23g.

[0122] Thus, the first U-phase wire 31U includes a first coil 31UA that is wound between the 1st slot 23a and the 20th slot 23t and then between the 14th slot 23n and the 19th slot 23s; and a second coil 31UB that is wound between the 13th slot 23m and the 8th slot 23h and then between the 2nd slot 23b and the 7th slot 23g.

[0123] The first V-phase line 31V includes 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 winding 31V1, the second winding 31V2, the third winding 31V3, and the fourth winding 31V4 are each wound twice in the same slot 23.

[0124] The first winding 31V1 is formed by winding the winding 30 input from the first V-phase lead 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 continuously winding the first winding 31V1 wound around the 16th slot 23p between the 10th slot 23j and the 15th slot 23o.

[0125] The third winding 31V3 is formed by continuously winding the second winding 31V2 wound around the 15th slot 23o between the 9th slot 23i and the 4th slot 23d. The fourth winding 31V4 is formed by continuously winding the third winding 31V3 wound around the 4th slot 23d between the 22nd slot 23v and the 3rd slot 24c.

[0126] Thus, the first V-phase wire 31V includes a first coil 31VA wound between the 21st slot 23u and the 16th slot 23p, then wound between the 10th slot 23j and the 15th slot 23o, and a second coil 31VB wound between the 9th slot 23i and the 4th slot 23d, then wound between the 22nd slot 23v and the 3rd slot 23c.

[0127] The first W-phase line 31W includes 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 in the same slot 23.

[0128] The first winding 31W1 is formed by winding the winding 30 input from the first W-phase lead W1in connected to the three-phase AC power supply between the 17th slot 23q and the 12th slot 231. The second winding 31W2 is formed by winding the first winding 31W1 wound around the 12th slot 231 continuously between the 6th slot 23f and the 11th slot 23k.

[0129] The third winding 31W3 is formed by continuously winding the second winding 31W2 wound around the 11th slot 23k between the 5th slot 23e and the 24th slot 23x. The fourth winding 31W4 is formed by continuously winding the third winding 31W3 wound around the 24th slot 23x between the 18th slot 23r and the 23rd slot 24w.

[0130] Thus, the first W-phase wire 31W includes a first coil 31WA that is wound between the 17th slot 23q and the 12th slot 231 and then 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 between the 18th slot 23r and the 23rd slot 23w.

[0131] The second U-phase wire 32U is wound around a plurality of slots 23. The second U-phase wire 32U is wound so as to pass through the same slots 23 as the first U-phase wire 31U the same number of times and in the same direction of current flow, and therefore detailed description is omitted here.

[0132] The second V-phase wire 32V is wound around the plurality of slots 23. The second V-phase wire 32V is wound so as to pass through the same slots 23 as the first V-phase wire 31V the same number of times and in the same direction of current flow, and therefore detailed description thereof is omitted.

[0133] The second W-phase wire 32W is wound around the plurality of slots 23. The second W-phase wire 32W is wound so as to pass through the same slots 23 as the first W-phase wire 31W the same number of times and in the same direction of current flow, and therefore detailed description is omitted here.

[0134] like Figure 4 As shown, 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 are configured as short-pitch windings, where the magnetic pole pitch differs from the coil pitch. Therefore, compared to full-pitch winding, short-pitch winding, which allows for variable coil pitch settings, makes it easier to achieve a uniform number of passes of the winding 30 in each slot 23.

[0135] Next, the operation of the rotating electrical machine 1 according to the second embodiment will be described.

[0136] When two windings 30 of the same phase are wound differently, the positive vertices of the dielectric voltage waveform generally deviate from each other. When the positive vertices of the dielectric voltage waveform deviate from each other, smooth rotation of the rotor 10 requires precise coordination of control of the first U, V, and W phase lines 31U, 31V, and 31W with control of the second U, V, and W phase lines 32U, 32V, and 32W, increasing the difficulty of control design.

[0137] Therefore, by winding the same phase windings 30 in the same slot 23 with the same number of times and current flow direction, the vertices of the two same phase windings 30 in the dielectric voltage waveform can be aligned. In other words, the phases of the same phases can be designed to be aligned.

[0138] The configuration and effects of the above-described embodiment will be summarized and described.

[0139] (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 line 31U electrically connected to the first inverter circuit 3a; a first V-phase line 31V electrically connected to the first inverter circuit 3a; a first W-phase line 31W electrically connected to the first inverter circuit 3a; a second U-phase line 32U electrically connected to the second inverter circuit 3b; a second V-phase line 32V electrically connected to the second inverter circuit 3b; and a rotor 10 rotated by a magnetic field generated by the first U-phase line 31U, the first V-phase line 31V, the first W-phase line 31W, the second U-phase line 32U, the second V-phase line 32V, and the second W-phase line 32W.

[0140] 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 ).

[0141] (2) The first U-phase line 31U and the second U-phase line 32U are designed to have the same phase winding layout, the first V-phase line 31V and the second V-phase line 32V are designed to have the same phase winding layout, and the first W-phase line 31W and the second W-phase line 32W are designed to have the same phase winding layout.

[0142] With this configuration, even when power supply 2 is split into two, even if there is a performance difference between the two power supplies 2, by aligning the phases of the same type, the positions of the positive and negative peaks of the induced voltage are aligned. This allows the rotor 10 to continue rotating smoothly without requiring particularly difficult control. This eliminates the need to use two different types of power supplies 2. More importantly, even when using two power supplies 2 of the same type, there is no concern about performance differences over time due to manufacturing variations between the two power supplies 2. This significantly reduces the complexity of control designs that anticipate performance degradation over time (for example, initial control design and learning control designs that monitor performance degradation over time).

[0143] (3) 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 are wound around the common core (stator core 21 ) to form the stator 20 .

[0144] According to this structure, the stator core 21 of the stator 20 is shared, thereby contributing to miniaturization and reduction in the number of parts.

[0145] While the embodiment of the present invention has been described above, the above embodiment merely shows one application example of the present invention and does not intend to limit the technical scope of the present invention to the specific configuration of the above embodiment.

[0146] For example, "a winding 30 passes an odd or even number of times" includes not only cases where a single winding 30 passes an odd or even number of times, but also cases where a winding 30 composed of a bundle of multiple wires passes an odd or even number of times, or a winding 30 composed of a group of wires wound multiple times passes an odd or even number of times. Therefore, regardless of the number of wires in the bundle or the number of turns of the multiple turns, as long as the bundle or group of wires passes an odd or even number of times, it is equivalent to the winding 30 passing an odd or even number of times.

[0147] Furthermore, the case where the winding 30 passes through the same slot 23 twice is the same as the case where the winding 30 passes through once. Therefore, the case where the winding 30 passes through the slot 23 once is equivalent to the case where the winding 30 passes through the slot 23 twice.

[0148] Description of Reference Numerals

[0149] 100: drive unit (unit)

[0150] 1: Rotating motor

[0151] 2a: First battery (first power source)

[0152] 2b: Second battery (second power source)

[0153] 3a: First inverter circuit

[0154] 3b: Second inverter circuit

[0155] 10: Rotor (rotor, shared rotor)

[0156] 20: stator (stator)

[0157] 21: stator core (shared core)

[0158] 23: Slot

[0159] 31U: First U phase line

[0160] 31V: First V phase line

[0161] 31W: first W phase line

[0162] 32U: Second U phase line

[0163] 32V: Second V phase line

[0164] 32W: Second W phase line

Claims

1. A unit, characterized in that have: a first power source; Second power supply; a first inverter circuit electrically connected to the first power source via a first power line; a second inverter circuit electrically connected to the second power source via a second power line; a first U-phase line electrically connected to the first inverter circuit; a first V-phase line electrically connected to the first inverter circuit; a first W-phase line electrically connected to the first inverter circuit; a second U-phase line electrically connected to the second inverter circuit; a second V-phase line electrically connected to the second inverter circuit; a second W-phase line electrically connected to the second inverter circuit; A common rotor is rotated by a magnetic field generated by the first U-phase line, the first V-phase line, the first W-phase line, the second U-phase line, the second V-phase line, and the second W-phase line.

2. The unit according to claim 1, characterized in that The first U-phase line and the second U-phase line are designed to have the same phase winding layout, The first V-phase line and the second V-phase line are designed to have the same phase winding layout. The first W-phase line and the second W-phase line are designed to have the same phase winding layout.

3. The unit according to claim 1, characterized in that 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.

Images