Rotary electric machine

Abstract

To enable a primary resonance peak and a secondary resonance peak of an LC resonance phenomenon to be simultaneously reduced.SOLUTION: A rotary electric machine includes a rotor, and a stator having a stator core, a plurality of slots, and a stator winding. The stator core has 2n in-phase slots for each pole, phase windings of the same phase being accommodated in the in-phase slots, and the in-phase slots being consecutively arranged circumferentially. The phase winding includes 2m parallel windings for connecting respective phase terminals to a neutral point, and every 2T phase windings are accommodated in one in-phase slot to be arranged in a row in a radial direction. When the parallel windings are arranged from one in-phase slot to an in-phase slot of another adjacent magnetic pole, the parallel windings are shifted in the radial direction by one row and arranged on a second row to a 2t-1 row from an outer diameter side. The parallel windings are shifted in the radial direction by one row, or not shifted in the radial direction, and arranged on a first row and a 2t row from the outer diameter side. 2T=2k(P / m) is satisfied for the relationship of the number of windings in the in-phase slot (2T), the number of magnetic poles (2P), and the number of parallel windings (2m).SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a rotating electric machine. [Background technology]

[0002] The following Patent Document 1 discloses a technology in which, in a rotating electric machine with a wave winding structure, each phase winding is divided into 2n (4) pieces from one end to the other, and from one end side, the winding is divided into a first partial winding a, a second partial winding b, a third partial winding c, and a fourth partial winding d, and the first partial winding a and the fourth partial winding d are housed in different in-phase slots.

[0003] This technology is said to improve insulation performance by reducing the mutual inductance acting between the first partial winding a and the fourth partial winding d, thereby reducing the surge voltage caused by resonance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-081356 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, even if the technology disclosed in Patent Document 1 can reduce double resonance, it tends to increase triple resonance, in which the sign of the mutual inductance is reversed. Furthermore, the technology disclosed in Patent Document 1 does not take into account the mutual inductance that occurs at the coil ends that connect the windings, and is therefore unable to reduce the mutual inductance at the coil ends. Therefore, the technology disclosed in Patent Document 1 cannot simultaneously reduce double and triple resonance, and therefore cannot simultaneously lower the primary and secondary resonance peaks of the LC resonance phenomenon. [Means for solving the problem]

[0006] In order to solve the above-described problems, a rotating electric machine according to one embodiment is a rotating electric machine including: a rotor having 2P (P is a natural number of 1 or more) magnetic poles arranged in the circumferential direction; a stator core inside which the rotor is arranged; a plurality of slots arranged in the circumferential direction in the stator core; and a stator winding made up of a plurality of phase windings inserted into the slots and wound around the stator core, wherein the stator core has 2n (n is a natural number of 1 or more) same-phase slots arranged circumferentially for each magnetic pole, each slot accommodating a phase winding of the same phase, and the phase winding is a 2n slot connecting each phase terminal to a neutral point. The phase windings consist of 2T (m is a natural number of 1 or greater) parallel windings, of which 2T (T is a natural number of 1 or greater) are housed in one in-phase slot aligned in a single radial row. When the parallel windings are moved from one in-phase slot to another in-phase slot of an adjacent magnetic pole, the parallel windings are shifted by one row in the radial direction for the 2nd row to the 2t-1th row from the outer diameter side, and the parallel windings are either shifted by one row in the radial direction for the 1st row and the 2tth row from the outer diameter side or are not shifted in the radial direction. The number of windings in the in-phase slot, 2T, the number of magnetic poles, 2P, and the number of parallel windings, 2m, have a relationship of 2T=2k(P / m) (k is a natural number of 1 or greater). [Effects of the Invention]

[0007] According to the rotating electric machine according to one embodiment, the primary and secondary resonance peaks of the LC resonance phenomenon can be reduced simultaneously. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram illustrating a configuration of a rotating electric machine according to an embodiment; [Figure 2] FIG. 1 is a diagram illustrating a configuration of a stator included in a rotating electric machine according to an embodiment; [Figure 3] FIG. 2 is a diagram illustrating a configuration of a stator winding included in a rotating electric machine according to an embodiment; [Figure 4] FIG. 1 is a diagram illustrating the arrangement and connection state of a plurality of partial windings in a stator included in a rotating electric machine according to an embodiment. [Figure 5] FIG. 1 is a diagram showing the arrangement and connection state of a plurality of partial windings in a stator provided in a conventional rotating electric machine. [Figure 6] A diagram showing an excerpt of the partial winding shown in Figure 5 [Figure 7] FIG. 1 is a diagram showing the parallel running distance between partial windings in a stator winding provided in a conventional rotating electric machine. [Figure 8] FIG. 10 is a diagram showing parallel running distances between partial windings in a stator winding included in a rotary electric machine according to an embodiment; [Figure 9] FIG. 10 is a diagram illustrating a comparison example of surge voltages generated in a rotating electric machine according to an embodiment and a conventional rotating electric machine. [Figure 10] FIG. 1 is a diagram showing a simplified equivalent circuit of a rotating electric machine having a star connection and driven by an inverter. [Figure 11] FIG. 11 is a diagram showing a second resonance occurring in the rotating electric machine shown in FIG. 10. [Figure 12] FIG. 11 is a diagram showing a third resonance occurring in the rotating electric machine shown in FIG. 10. [Figure 13] FIG. 10 is a diagram showing the configuration of a stator winding included in a rotary electric machine according to a first modified example. [Figure 14] FIG. 10 is a diagram showing a first modified example of the arrangement and connection state of a plurality of partial windings in a stator included in a rotating electric machine according to a first modified example; [Figure 15] FIG. 10 is a diagram showing a second modification of the arrangement and connection state of a plurality of partial windings in a stator included in a rotating electric machine according to a second modification; [Figure 16] FIG. 10 is a diagram showing a fourth modification of the arrangement and connection state of a plurality of partial windings in a stator included in a rotating electric machine according to a fourth modification; [Figure 17] FIG. 10 is a diagram showing the parallel running distance between partial windings in a stator winding included in a rotary electric machine according to a fourth modification; [Figure 18] FIG. 10 is a diagram showing a comparison example of surge voltages generated in a rotating electric machine according to a fourth modification to a conventional rotating electric machine. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0010] (Configuration of rotating electric machine 100) Fig. 1 is a diagram showing the configuration of a rotating electric machine 100 according to one embodiment. The rotating electric machine 100 shown in Fig. 1 is used to drive electric vehicles such as hybrid cars, fuel cell cars, and electric cars, for example.

[0011] As shown in FIG. 1, the rotating electrical machine 100 includes a stator 110, a rotor 120, and a housing .

[0012] Stator 110 has a cylindrical shape and is fixed to housing 130. When current is supplied from inverter circuit 10 via power line 11, stator 110 generates a rotating magnetic field for rotating rotor 120.

[0013] The rotor 120 is provided inside the cylinder of the stator 110. The rotor 120 has a rotating shaft 121 that is provided coaxially with the central axis of the stator 110. Both ends of the rotating shaft 121 are rotatably supported by a pair of bearings 131 provided in the housing 130. This allows the rotor 120 to rotate around the axis of the rotating shaft 121 by the rotating magnetic field generated by the stator 110. The rotor 120 has a plurality of magnetic poles arranged in the circumferential direction.

[0014] In this embodiment, the rotor 120 has 2P (P is a natural number equal to or greater than 1) magnetic poles, and as an example, the rotor 120 has 8 (ie, P=4) magnetic poles.

[0015] (Configuration of stator 110) 2 is a diagram showing the configuration of a stator 110 included in a rotary electric machine 100 according to one embodiment. As shown in FIG.

[0016] The stator core 111 is a cylindrical metal member extending in the axial direction of the rotor shaft (not shown). For example, the stator core 111 is formed by laminating a plurality of electromagnetic steel plates in the axial direction of the rotor shaft.

[0017] A plurality of slots 111A (48 in the example shown in FIG. 2) are arranged circumferentially on the inner peripheral surface of the stator core 111. Each slot 111A is provided between two adjacent teeth and is a space in which a plurality of U-shaped windings 112 are arranged.

[0018] The stator winding 114 has three phase windings 113 (U-phase, V-phase, and W-phase) wound in a spiral wave winding in the circumferential direction along the slots 111A of the stator core 111. As shown in Fig. 2, each phase winding 113 is formed by connecting a plurality of U-shaped windings 112 in series. Note that Fig. 2 illustrates one phase winding 113 made up of four U-shaped windings 112.

[0019] Each of the multiple U-shaped windings 112 is a metal (e.g., copper) member having a roughly U-shape. As shown in Fig. 2, each of the multiple U-shaped windings 112 is inserted from one side of a slot 111A of the stator core 111. The coil end portion of each of the multiple U-shaped windings 112 protruding from the other side of the slot 111A is joined to the coil end portion of another U-shaped winding 112 by bending and welding.

[0020] (Configuration of stator winding 114) FIG. 3 is a diagram showing the configuration of a stator winding 114 included in a rotary electric machine 100 according to one embodiment.

[0021] 3, the stator winding 114 is configured to include a U-phase winding 113, a V-phase winding 113, and a W-phase winding 113, each of which has two parallel windings connected in parallel to each other. Each parallel winding is configured to include four partial windings connected in series.

[0022] The U-phase winding 113 has one end connected to the U-phase terminal and the other end connected to the neutral point 114A. The V-phase winding 113 has one end connected to the V-phase terminal and the other end connected to the neutral point 114A.

[0023] That is, in this embodiment, the stator winding 114 is configured such that the phase winding 113 of each phase is made up of 2m (m is a natural number greater than or equal to 1) parallel windings, and as an example, the phase winding 113 of each phase is made up of two (i.e., m=1) parallel windings.

[0024] Specifically, the U-phase first parallel winding 113-U1 includes a first partial winding U1a, a second partial winding U1b, a third partial winding U1c, and a fourth partial winding U1d, while the U-phase second parallel winding 113-U2 includes a first partial winding U2a, a second partial winding U2b, a third partial winding U2c, and a fourth partial winding U2d.

[0025] The V-phase first parallel winding 113-V1 includes a first partial winding V1a, a second partial winding V1b, a third partial winding V1c, and a fourth partial winding V1d, and the V-phase second parallel winding 113-V2 includes a first partial winding V2a, a second partial winding V2b, a third partial winding V2c, and a fourth partial winding V2d.

[0026] The first parallel winding 113-W1 of the W-phase winding 113 includes a first partial winding W1a, a second partial winding W1b, a third partial winding W1c, and a fourth partial winding W1d, and the second parallel winding 113-W2 of the W-phase includes a first partial winding W2a, a second partial winding W2b, a third partial winding W2c, and a fourth partial winding W2d.

[0027] (Arrangement and connection state of multiple partial windings) Fig. 4 is a diagram showing the arrangement and connection state of a plurality of partial windings in a stator 110 included in a rotating electric machine 100 according to one embodiment. Fig. 4 shows, in a linear development, the arrangement and connection state at the coil end of a plurality of partial windings U1a to U1d and U2a to U2d constituting a U-phase phase winding 113 when viewed from the top side of the stator core 111 in the case where the stator winding 114 is configured as two parallel star-connected windings for three phases as shown in Fig. 3.

[0028] For convenience, FIG. 4 shows the U-phase first parallel winding 113-U1 and the U-phase second parallel winding 113-U2 separately, with FIG. 4(a) showing the U-phase first parallel winding 113-U1 and FIG. 4(b) showing the U-phase second parallel winding 113-U2.

[0029] 4, solid arrows indicate connections on the upper surface side of stator core 111, and dashed arrows indicate connections on the lower surface side of stator core 111. In addition, in FIG. 4, the upper side indicates the outer diameter side of stator core 111, and the lower side indicates the inner diameter side of stator core 111.

[0030] As shown in FIG. 4, the rotating electric machine 100 according to one embodiment employs a stator winding 114 configured as two parallel connections of one slot, eight turns, and eight poles.

[0031] In one embodiment of the rotating electric machine 100, as shown in FIG. 4, the stator core 111 has 2n (n is a natural number greater than or equal to 1) in-phase slots, which house phase windings 113 of the same phase, arranged consecutively in the circumferential direction for each magnetic pole, for example, two slots for each pole.

[0032] Furthermore, in the rotating electric machine 100 according to one embodiment, as shown in FIG. 4, 2T (T is a natural number equal to or greater than 1) of the phase windings 113 are housed in a single radial row in each same-phase slot, and as an example, 8 windings are housed in a single radial row in each same-phase slot.

[0033] Furthermore, in the rotating electric machine 100 according to one embodiment, as shown in FIG. 4, when each parallel winding 113-U1, 113-U2 is arranged from one in-phase slot to an in-phase slot of another adjacent magnetic pole, it is arranged by shifting one row in the radial direction in the second row to the 2t-1 row from the outer diameter side (the seventh row in the example shown in FIG. 4), and it is arranged by shifting one row in the radial direction in the first row and the 2t row from the outer diameter side (the eighth row in the example shown in FIG. 4) or by not shifting in the radial direction.

[0034] Furthermore, in the rotating electric machine 100 according to one embodiment, the number of windings in the same-phase slots, 2T (T is a natural number equal to or greater than 1), is "8," the number of magnetic poles of the rotor 120, 2P (P is a natural number equal to or greater than 1), is "8," and the number of parallel windings of each phase winding 113, 2m (m is a natural number equal to or greater than 1), is "2." Therefore, in the rotating electric machine 100 according to one embodiment, the number of windings in the same-phase slots, 2T, the number of magnetic poles of the rotor 120, 2P, and the number of parallel windings of each phase winding 113, 2m, have a relationship of 2T=2k(P / m) (k is a natural number equal to or greater than 1).

[0035] (Configuration of stator windings provided in conventional rotating electrical machines) Fig. 5 is a diagram showing the arrangement and connection state of a plurality of partial windings in a stator provided in a conventional rotating electric machine, and Fig. 6 is a diagram showing an excerpt of some of the partial windings shown in Fig. 5.

[0036] 5 and 6, similar to FIG. 4, show the first U-phase parallel winding and the second U-phase parallel winding separately, with FIGS. 5(a) and 6(a) showing the first parallel winding and FIGS. 5(b) and 6(b) showing the second U-phase parallel winding.

[0037] As shown in Figures 5 and 6, the stator windings of the conventional rotating electric machine are similar to the stator winding 114 of the rotating electric machine 100 according to one embodiment in that the first U-phase parallel winding has partial windings U1a to U1d and the second U-phase parallel winding has partial windings U2a to U2d.

[0038] However, conventional rotating electrical machines employ a stator winding configuration of 1 slot, 6 turns, and 8 poles, with two parallel connections.

[0039] 6, in a conventional rotating electric machine, the coil end portion of the partial winding U1a-1 and the coil end portion of the partial winding U2a-1 run parallel to each other between magnetic poles 1 to 3. Therefore, in the conventional rotating electric machine, there is a risk of mutual inductance occurring between the coil end portion of the partial winding U1a-1 and the coil end portion of the partial winding U2a-1 between magnetic poles 1 to 3.

[0040] (Example of comparison of parallel running distance between partial windings) Fig. 7 is a diagram showing the parallel running distance between partial windings in a stator winding included in a conventional rotating electric machine. Fig. 8 is a diagram showing the parallel running distance between partial windings in a stator winding 114 included in a rotating electric machine 100 according to one embodiment.

[0041] 7 and 8 show the results of calculating the parallel running distances for all combinations of partial windings U1a to U1d of the first U-phase parallel winding and partial windings U2a to U2d of the second U-phase parallel winding using a method similar to that used in FIG. 6 for the stator windings of a conventional rotating electric machine and the stator winding 114 of the rotating electric machine 100 according to one embodiment.

[0042] As shown in Figures 5 and 6, conventional rotating electric machines use a stator winding configuration with two parallel connections of 1 slot, 6 turns, and 8 poles. Therefore, the parallel running distance between partial windings in the stator winding of conventional rotating electric machines is as shown in Figure 7. In Figure 7, the shaded areas indicate combinations that affect the mutual inductance M1 or the mutual inductance M2.

[0043] Here, the total value of the parallel running distances between U1a and U2b, between U1b and U2a, between U1c and U2d, and between U1d and U2c is "36", which is proportional to the mutual inductance M1.

[0044] Furthermore, the total value of the parallel running distances between U1a and U2d, between U1b and U2c, between U1c and U2b, and between U1d and U2a is "64", which is proportional to the mutual inductance M2.

[0045] Therefore, in the stator winding configuration of the conventional rotating electric machine shown in Figures 5 and 6, M1-M2 is "-28", the influence of the coupling of mutual inductance M2 is large, and the surge voltage due to double resonance tends to increase.

[0046] On the other hand, as shown in Fig. 4, the rotating electric machine 100 according to one embodiment employs a 1-slot, 8-turn, 8-pole, 2-parallel connection configuration for the stator winding 114. Therefore, the parallel running distance between partial windings in the stator winding 114 included in the rotating electric machine 100 according to one embodiment is as shown in Fig. 8. In Fig. 8, the shaded portions indicate combinations that affect the mutual inductance M1 or the mutual inductance M2.

[0047] Here, the total value of the parallel running distances between U1a and U2b, between U1b and U2a, between U1c and U2d, and between U1d and U2c is "96", which is proportional to the mutual inductance M1.

[0048] Furthermore, the sum of the parallel running distances between U1a and U2d, between U1b and U2c, between U1c and U2b, and between U1d and U2a is "100", which is proportional to the mutual inductance M2.

[0049] Therefore, in the configuration of the stator winding 114 provided in the rotating electric machine 100 according to one embodiment shown in FIG. 4, M1-M2 is "-4", and the coupling of mutual inductance M1 and the coupling of mutual inductance M2 are approximately equal.

[0050] Therefore, the rotating electric machine 100 according to one embodiment can reduce both the second and third resonances.

[0051] (Example of surge voltage comparison) 9 is a diagram showing a comparison of surge voltages occurring in the rotating electric machine 100 according to one embodiment with a conventional rotating electric machine. In FIG. 9, the solid line indicates the surge voltage occurring in the rotating electric machine 100 according to one embodiment. The dashed line indicates the surge voltage occurring in the conventional rotating electric machine. The dotted line indicates the output voltage of the inverter circuit 10.

[0052] As shown in FIG. 9, in a conventional rotating electric machine, the influence of the mutual inductance M2 coupling is greater than that of the mutual inductance M1 coupling, so that the surge voltage generated when the inverter circuit 10 is switched tends to increase due to double resonance.

[0053] On the other hand, as shown in FIG. 9, in the rotating electric machine 100 according to one embodiment, the coupling of mutual inductance M1 and the coupling of mutual inductance M2 are approximately equal, and both the second and third resonances can be reduced, thereby reducing the surge voltage that occurs when the inverter circuit 10 is switched, for example.

[0054] In this way, in one embodiment of the rotating electric machine 100, the configuration of the stator winding 114 is as shown in Figure 4, and therefore there is a relationship of 2T = 2k (P / m) (k is a natural number greater than or equal to 1) between the number of windings in the same phase slot, 2T (T is a natural number greater than or equal to 1), the number of magnetic poles of the rotor 120, 2P (P is a natural number greater than or equal to 1), and the number of parallel windings of each phase winding 113, 2m.This makes it possible to reduce both the second and third resonances; in other words, it is possible to simultaneously lower the first and second resonance peaks of the LC resonance phenomenon, thereby reducing the surge voltage.

[0055] (Principle of surge voltage generation) Here, the principle of surge voltage generation in a rotating electric machine will be explained with reference to Figs. 10 to 12. Fig. 10 is a diagram showing a simplified equivalent circuit of a rotating electric machine that has a star connection and is inverter-driven. In Fig. 10, parallel connections are shown as one for simplification. Also, in Fig. 10, the capacitors between each phase winding represent stray capacitance that exists via the stator core.

[0056] Fig. 11 is a diagram showing a second resonance occurring in the rotating electric machine shown in Fig. 10. Fig. 12 is a diagram showing a third resonance occurring in the rotating electric machine shown in Fig. 10.

[0057] In the rotating electric machine shown in FIG. 10, the inductance L and stray capacitance C of each phase winding cause an LC resonance phenomenon, which may result in the generation of a surge voltage that exceeds the output voltage of the inverter circuit, as shown in FIG.

[0058] For example, as shown in FIG. 11, when double resonance occurs as an LC resonance phenomenon in a rotating electrical machine, the surge voltage Vs can be approximated by the following equation (1) based on the characteristics of the resonance circuit.

[0059]

number

[0060] Furthermore, for example, as shown in FIG. 12, when triple resonance occurs as an LC resonance phenomenon in a rotating electrical machine, the surge voltage Vs can be approximated by the following equation (2) based on the characteristics of the resonance circuit.

[0061]

number

[0062] In the above formulas (1) and (2), R represents the loss generated in the stator core, and M1 and M2 represent the mutual inductance acting between the phase windings.

[0063] The reason why the signs of the mutual inductances M1 and M2 are reversed between double and triple resonance is that when each phase winding is divided into 2n pieces (four pieces, for example) from one end to the other, and the windings are arranged from one end to the other into a first partial winding a, a second partial winding b, a third partial winding c, and a fourth partial winding d, the direction of the resonant current is reversed between the combination of partial windings that affects the mutual inductance M1 (the combination of partial windings a and b, and the combination of partial windings c and d) and the combination of partial windings that affects the mutual inductance M2 (the combination of partial windings a and d, and the combination of partial windings b and c).This reflects the fact that the effective inductance in the equivalent circuit fluctuates.

[0064] In order to achieve the objective of simultaneously reducing the double resonance and the triple resonance, it is preferable that the mutual inductance M1 and the mutual inductance M2 are approximately equal.

[0065] As described above, conventional rotating electric machines (for example, the rotating electric machine of Patent Document 1) have stator winding configurations that do not take into account the mutual inductance that occurs at the coil ends that connect the windings together, and therefore cannot simultaneously reduce the second and third resonances, and therefore cannot simultaneously reduce the first and second resonance peaks of the LC resonance phenomenon.

[0066] On the other hand, in one embodiment of the rotating electric machine 100, the configuration of the stator winding 114 takes into account the mutual inductance that occurs at the coil ends that connect the windings together, and since the mutual inductance M1 and the mutual inductance M2 can be made approximately equal, the double resonance and the triple resonance can be reduced simultaneously, and therefore the primary resonance peak and the secondary resonance peak of the LC resonance phenomenon can be lowered simultaneously.

[0067] (First Modification, Second Modification, Third Modification) Fig. 13 is a diagram showing the configuration of a stator winding 114 included in a rotating electric machine 100 according to a first modified example. Fig. 14 is a diagram showing a first modified example of the arrangement and connection state of a plurality of partial windings in a stator 110 included in a rotating electric machine 100 according to the first modified example. Fig. 15 is a diagram showing a second modified example of the arrangement and connection state of a plurality of partial windings in a stator 110 included in a rotating electric machine 100 according to a second modified example.

[0068] As described above, in order to reduce both the second and third resonances and thereby reduce surge voltage, the number of windings in the same phase slot, 2T (T is a natural number greater than or equal to 1), the number of magnetic poles of the rotor 120, 2P (P is a natural number greater than or equal to 1), and the number of parallel windings of each phase winding 113, 2m, need to satisfy the relationship 2T=2k(P / m) (k is a natural number greater than or equal to 1).

[0069] For this reason, as a first modified example, as shown in FIGS. 13 and 14, the configuration of the stator winding 114 may be such that for the U phase, a first parallel winding 113-U1, a second parallel winding 113-U2, a third parallel winding 113-U3, and a fourth parallel winding 113-U4 are connected in parallel, resulting in a one-slot, eight-turn, eight-pole, four-parallel connection.

[0070] Also, for example, as shown in FIG. 15, as a second modified example, the stator winding 114 may be configured as 4 parallel connections of 1 slot, 4 turns, and 8 poles.

[0071] Furthermore, for example, although not shown, as a third modified example, the stator winding 114 may be configured as two parallel connections of one slot, 16 turns, and 8 poles.

[0072] (Fourth Modification) Fig. 16 is a diagram showing a fourth modified example of the arrangement and connection state of a plurality of partial windings in a stator 110 included in a rotating electric machine 100 according to the fourth modified example. Fig. 17 is a diagram showing the parallel running distance between partial windings in a stator winding 114 included in a rotating electric machine 100 according to the fourth modified example. Fig. 18 is a diagram showing a comparison example of surge voltages generated in a rotating electric machine 100 according to the fourth modified example with a conventional rotating electric machine.

[0073] In one embodiment, the rotating electric machine 100 may satisfy the requirement that, instead of the requirement that "the number of windings in the same phase slots, 2T, the number of magnetic poles of the rotor 120, 2P, and the number of parallel windings of each phase winding 113, 2m, have a relationship of 2T = 2k (P / m) (k is a natural number greater than or equal to 1), the number of windings in the same phase slots, 2T, the number of magnetic poles of the rotor 120, 2P, and the number of parallel windings of the phase winding 113, 2m, have a relationship of 2T ≠ 2k (P / m) (k is a natural number greater than or equal to 1), and between different parallel windings in the phase winding 113, the positions of the phase terminals and the positions of the neutral points are separated circumferentially by at least the number of slots - n, which is the same number as the number of magnetic poles, 2P."

[0074] For example, as shown in FIG. 16, in a fourth modified example of a rotating electric machine 100 according to one embodiment, when the stator winding 114 is configured as two parallel connections with six turns and eight poles per slot, the positions of the phase terminals and the neutral point between the first U-phase parallel winding and the second U-phase parallel winding may be spaced apart circumferentially by two magnetic poles (six slots).

[0075] In this case, the parallel running distance between the partial windings in the stator winding 114 included in the rotary electric machine 100 according to one embodiment is as shown in Fig. 17. In Fig. 17, the shaded areas indicate combinations that affect the mutual inductance M1 or the mutual inductance M2.

[0076] Here, the total value of the parallel running distances between U1a and U2b, between U1b and U2a, between U1c and U2d, and between U1d and U2c is "64", which is proportional to the mutual inductance M1.

[0077] Furthermore, the total value of the parallel running distances between U1a and U2d, between U1b and U2c, between U1c and U2b, and between U1d and U2a is "36", which is proportional to the mutual inductance M2.

[0078] Therefore, in the configuration of the stator winding 114 provided in the rotating electric machine 100 according to one embodiment shown in FIG. 17, M1-M2 is "+28", and although the influence of the coupling of mutual inductance M1 is large and the surge voltage due to triple resonance tends to increase, the relatively large influence of double resonance can be reduced.

[0079] As a result, as shown in FIG. 18, the rotating electric machine 100 according to one embodiment can reduce surge voltages that occur when the inverter circuit 10 is switched, etc., compared to conventional rotating electric machines.

[0080] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0081] 10 Inverter circuit 11 Power line 100 Rotating Electric Machine 110 Stator 111 Stator core 111A Slot 112 U-winding 113 Phase Winding 113-U1, 113-V1, 113-W1 First parallel winding 113-U2, 113-V2, 113-W2 Second parallel winding U1a, U2a, V1a, V2a, W1a, W2a First partial winding U1b, U2b, V1b, V2b, W1b, W2b Second partial winding U1c, U2c, V1c, V2c, W1c, W2c Third partial winding U1d, U2d, V1d, V2d, W1d, W2d 4th partial winding 114 Stator Winding 114A Neutral point 120 rotor 121 Rotation axis 130 cabinet 131 Bearings

Claims

1. a rotor having 2P (P is a natural number equal to or greater than 1) magnetic poles arranged in a circumferential direction; a stator having a stator core on the inside of which the rotor is arranged, a plurality of slots arranged in the circumferential direction of the stator core, and a stator winding consisting of a plurality of phase windings inserted into the slots and wound around the stator core; A rotating electric machine comprising: the stator core has 2n (n is a natural number equal to or greater than 1) in-phase slots for accommodating the phase windings of the same phase, the in-phase slots being arranged consecutively in the circumferential direction for each of the magnetic poles; The phase winding is made up of 2m (m is a natural number equal to or greater than 1) parallel windings connecting each phase terminal to a neutral point, Two T (T is a natural number equal to or greater than 1) of the phase windings are accommodated in each of the same phase slots in a single radial row, When the parallel windings are arranged from one of the in-phase slots to the in-phase slot of another adjacent magnetic pole, the parallel windings are arranged by shifting one row in the radial direction in the second row to the (2t-1) row from the outer diameter side, and the parallel windings are arranged by shifting one row in the radial direction in the first row and the (2t-1) row from the outer diameter side, or by not shifting in the radial direction; The number of windings in the same phase slot, 2T, the number of magnetic poles, and the number of parallel windings, 2m, have a relationship of 2T=2k(P / m) (k is a natural number equal to or greater than 1). A rotating electric machine characterized by:

2. a rotor having 2P (P is a natural number equal to or greater than 1) magnetic poles arranged in a circumferential direction; a stator having a stator core on the inside of which the rotor is arranged, a plurality of slots arranged in the circumferential direction of the stator core, and a stator winding consisting of a plurality of phase windings inserted into the slots and wound around the stator core; A rotating electric machine comprising: the stator core has 2n (n is a natural number equal to or greater than 1) in-phase slots for accommodating the phase windings of the same phase, the in-phase slots being arranged consecutively in the circumferential direction for each of the magnetic poles; The phase winding is made up of 2m (m is a natural number equal to or greater than 1) parallel windings connecting each phase terminal to a neutral point, Two T (T is a natural number equal to or greater than 1) of the phase windings are accommodated in each of the same phase slots in a single radial row, When the parallel windings are arranged from one of the in-phase slots to the in-phase slot of another adjacent magnetic pole, the parallel windings are arranged by shifting one row in the radial direction in the second row to the (2t-1) row from the outer diameter side, and the parallel windings are arranged by shifting one row in the radial direction in the first row and the (2t-1) row from the outer diameter side, or by not shifting in the radial direction; The number of windings in the same phase slot, 2T, the number of magnetic poles, 2P, and the number of parallel windings, 2m, have a relationship of 2T≠2k(P / m) (k is a natural number equal to or greater than 1), and between different parallel windings in the phase winding, the positions of the phase terminals and the positions of the neutral points are spaced apart in the circumferential direction by at least the number of slots, which is equal to the number of magnetic poles, 2P, minus n. A rotating electric machine characterized by:

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