Rotating electrical machine

Abstract

A rotary electric machine includes a stator and a rotor. The stator includes a stator core having a plurality of slots arranged in a circumferential direction, and a stator winding having a plurality of phase coils wound in the slots. The rotor is arranged opposite the stator in a radial direction, and has a plurality of magnetic poles in the circumferential direction. In the rotary electric machine, each phase coil has a plurality of series-connected coil groups, each of the series-connected coil groups including n unit coils arranged to be wound in the circumferential direction. A first end of each series-connected coil group is connected to a phase terminal for the respective phase, a second end is connected to a neutral point, and the series-connected coil groups are connected in parallel.

Description

TECHNICAL FIELD

[0001] The present application relates to a rotary electric machine. BACKGROUND

[0002] In the past, a rotary electric machine has been known, which includes a stator core having a plurality of slots in a circumferential direction, and a stator winding wound in the slots. In such a rotary electric machine, the following situation is known to occur. That is, when a square wave voltage is applied, a resonance phenomenon occurs in the stator winding due to a high frequency component, and the voltage is amplified (see JP-A-2013-081356).

[0003] When the maximum phase-to-phase voltage increases due to voltage amplification, a current short circuit can occur. Therefore, it is necessary to improve the insulation performance between phases. However, in order to improve the insulation performance between phases, it is possible to thicken the insulation film or the like. As a result, an increase in the phase-to-phase distance becomes a problem. That is, a decrease in the space factor (density) of the winding, an increase in size, or the like becomes a problem.

[0004] Here, in the rotary electric machine of JP-A-2013-081356, in the stator winding formed by the wave winding, when the phase winding of the same phase is divided into four windings from the first end to the second end, and the divided windings are a first partial winding, a second partial winding, a third partial winding, and a fourth partial winding, the first partial winding and the fourth partial winding are housed in different slots of the same phase in order from the first end. As a result, the magnetic coupling between the first partial winding and the fourth partial winding is weakened. The mutual inductance can be set to be close to zero, and the resonance can be suppressed. Therefore, the required insulation performance can be reduced, and the phase-to-phase distance can be shortened.

[0005] Here, in addition to the stator winding having the wave winding structure, a stator winding having a lap winding structure is known. The stator winding having the lap winding structure is configured to have a plurality of unit coils formed by a lap winding. The phase coil for each phase is configured so that the plurality of unit coils are connected in series. In this case, in the configuration in which the plurality of unit coils are connected in series, the following state can be considered. That is, for example, a resonance current in the opposite direction can flow through the unit coil at the phase terminal side and the unit coil at the neutral point side in each phase. As a result, a surge voltage can be generated. Furthermore, a decrease in the insulation performance due to the surge voltage becomes a problem. SUMMARY

[0006] Therefore, it is desirable to provide a rotary electric machine capable of appropriately achieving an improvement in insulation performance.

[0007] The aspects disclosed in the present specification achieve respective objects by different technical means. The objects, features, and effects disclosed in the present specification will be further clarified with reference to the following detailed description and the attached drawings.

[0008] The first aspect provides a rotary electric machine including: a stator having a stator core and a stator winding, the stator core having a plurality of slots arranged in a circumferential direction, the stator winding having a plurality of phase coils wound in the slots; and a rotor arranged opposite to the stator in a radial direction and having a plurality of magnetic poles in the circumferential direction.

[0009] In the rotary electric machine, each phase coil has a plurality of series-connected coil groups, each of the series-connected coil groups including n unit coils arranged to be wound in the circumferential direction. A first end of each of the series-connected coil groups is connected to a phase terminal for the respective phase, a second end is connected to a neutral point, and the series-connected coil groups are connected in parallel.

[0010] In at least any one of the phase coils, at least a first end in the circumferential direction of an i-th unit coil counted in a connection order from the phase terminal, and each of first ends in the circumferential direction of an (a+1)-th unit coil and a (b+1)-th unit coil are accommodated in a slot of the same phase within the same magnetic pole, where i is a natural number of any one of 1 to n, a is a remainder of i divided by n, and b is a remainder of i-2 divided by n. In addition, each of the first end and a second end in the circumferential direction of the (a+1)-th unit coil and the (b+1)-th unit coil are accommodated in the slot of the same phase within the same magnetic pole.

[0011] In the rotary electric machine configured as described above, each phase coil of the stator winding has a plurality of series-connected coil groups, each of the series-connected coil groups including n unit coils. A first end of each of the series-connected coil groups is connected to a phase terminal for each phase, and a second end is connected to a neutral point. In this state, the series-connected coil groups are connected in parallel to each other. In this case, this configuration is advantageous in achieving higher output in the rotary electric machine.

[0012] Further, in the stator winding, in each phase coil, due to a high-frequency component generated accompanying switching during energization of the coil, resonance phenomena can occur in opposite directions between unit coils of different numbers counted in a connection order from the phase terminal. Therefore, it can be considered that a voltage difference (shared voltage) between the unit coils increases. This is considered to cause a decrease in the insulation performance of the stator winding.

[0013] In view of this, according to the first aspect, at least a first end in the circumferential direction of the i-th unit coil counted in the connection order from the phase terminal and each of the first ends in the circumferential direction of the (a+1)-th unit coil and the (β+1)-th unit coil are accommodated in the same phase slot within the same magnetic pole, where a is a remainder of i divided by n, and β is a remainder of i-2 divided by n. In addition, each of the first end and the second end in the circumferential direction of the (a+1)-th unit coil and the (β+1)-th unit coil are accommodated in the same phase slot within the same magnetic pole.

[0014] In this case, due to the magnetic coupling between the (a+1)-th unit coil and the (β+1)-th unit coil, resonance phenomenon can be suppressed. That is, due to the voltage at one unit coil in the same phase slot within the same magnetic pole being transmitted to the voltage at the other unit coil, elimination of the resonance voltage can be achieved. As a result, an increase in the voltage difference (shared voltage) between the unit coils can be suppressed. Furthermore, an improvement in the insulation performance can be appropriately achieved.

[0015] Here, the (a+1)-th unit coil and the (β+1)-th unit coil are specifically described as follows.

[0016] For example, when i = 5 and n = 8, the quotient of 5(i) divided by 8(n) is 0, and the remainder is 5. Therefore, a = 5, and the (a+1)-th unit coil is the 6-th unit coil. In addition, the quotient of 3(i-2) divided by 8(n) is 0, and the remainder is 3. Therefore, β = 3, and the (β+1)-th unit coil is the 4-th unit coil. In this case, the i-th unit coil, the (a+1)-th unit coil, and the (β+1)-th unit coil are the 5-th unit coil, the 6-th unit coil, and the 4-th unit coil, respectively.

[0017] In addition, when i = 1 and n = 8, the quotient of 1(i) divided by 8(n) is 0, and the remainder is 1. Therefore, a = 1, and the (a+1)-th unit coil is the 2-th unit coil. In addition, the quotient of -1(i-2) divided by 8(n) is -1, and the remainder is 7. Therefore, β = 7, and the (β+1)-th unit coil is the 8-th unit coil. In this case, the i-th unit coil, the (a+1)-th unit coil, and the (β+1)-th unit coil are the 1-st unit coil, the 2-nd unit coil, and the 8-th unit coil, respectively.

[0018] Further, when i = 8 and n = 8, the quotient of 8(i) divided by 8(n) is 1, and the remainder is 0. Therefore, a = 0, and the (a + 1)th unit coil is the 1st unit coil. In addition, the quotient of 6(i - 2) divided by 8(n) is 0, and the remainder is 6. Therefore, β = 6, and the (β + 1)th unit coil is the 7th unit coil. In this case, the i-th unit coil, the (a + 1)th unit coil, and the (β + 1)th unit coil are the 8th unit coil, the 1st unit coil, and the 7th unit coil, respectively.

[0019] Here, if i is defined as a natural number of any one of 1 to n, where the n-th unit coil immediately precedes the 1st unit coil, and the 1st unit coil immediately follows the n-th unit coil, the i-th unit coil, the (a + 1)th unit coil, and the (β + 1)th unit coil are the i-th unit coil, the (i + 1)th unit coil, and the (i - 1)th unit coil, respectively. In this case, for example, when n = 8, the 8th (n-th) unit coil precedes the 1st unit coil, and the 1st unit coil immediately follows the 8th (n-th) unit coil.

[0020] The second aspect according to the first aspect, wherein the series-connected coil group includes a unit coil wound on a first side in a circumferential direction from a phase terminal to a neutral point, and a unit coil wound on a second side in the circumferential direction, and the i-th unit coil is arranged at a turn-around position in the winding direction.

[0021] In the configuration as described above, in the series-connected coil group, the winding direction of the unit coils is turned around at the i-th unit coil counted from the phase terminal. In addition, with reference to the i-th unit coil arranged at the turn-around position, the (i - 1)th unit coil (corresponding to the (β + 1)th unit coil) and the (i + 1)th unit coil (corresponding to the (a + 1)th unit coil) are accommodated in the same phase slot within the same magnetic pole. As a result, a configuration in which the (i ± 1)th unit coils are accommodated in the same phase slot within the same magnetic pole can be appropriately obtained.

[0022] The third aspect according to the first aspect or the second aspect, wherein each series-connected coil group is provided in a circumferential direction region smaller than a single turn around the stator core, and series-connected coil groups different from each other are arranged in line along the circumferential direction.

[0023] Due to the configuration as described above, the phase terminal side unit coil and the neutral point side unit coil can be accommodated in the same phase slot within the same magnetic pole between the series-connected coil groups. Therefore, due to the magnetic coupling between these series-connected coil groups, the resonance voltage between the series-connected coil groups different from each other can be reduced.

[0024] The fourth embodiment is according to any one of the first to third embodiments, wherein at least each first end of an i-th unit coil in a first series-connected coil group and a j-th unit coil in a second series-connected coil group in two series-connected coil groups included in the same phase coil in the same phase is housed in the same phase slot within the same magnetic pole, and i≠j.

[0025] In the configuration as described above, the unit coils housed in the same phase slot within the same magnetic pole are included in different series-connected coil groups from each other in the same phase coil. The numbers i, j of the connection order of the unit coils are different from each other. In this case, by the combination of the unit coils housed in the same phase slot within the same magnetic pole, a configuration for suppressing a resonance phenomenon can be easily obtained. Such a configuration can be easily obtained. Further, a suitable configuration for suppressing a secondary resonance other than a primary resonance can be obtained.

[0026] The fifth aspect is according to the fourth aspect, wherein in the i-th unit coil, n / 4 < i ≤ 3n / 4 is established, and in the j-th unit coil, at least one of j ≤ n / 4 and j > 3n / 4 is established.

[0027] In the configuration as described above, for example, when n = 8, 2 < i ≤ 6, and j ≤ 2 or j > 6. In this case, the combination of the unit coils housed in the same phase slot within the same magnetic pole is a combination of a unit coil close to a phase terminal or a neutral point and a unit coil close to a middle position from the phase terminal to the neutral point. A configuration that more strongly suppresses a secondary resonance can be obtained.

[0028] The sixth aspect is according to any one of the first to fifth aspects, wherein in at least any one of the phase coils, when a k-th unit coil counted in the connection order from the phase terminal and a k-th unit coil counted in the connection order from the neutral point are considered to be a symmetric coil, at least each first end in the circumferential direction of the symmetric coil present from the phase terminal to the neutral point is housed in the same phase slot within the same magnetic pole.

[0029] In the configuration as described above, in each phase coil, a combination of unit coils that are symmetric coils in terms of the connection order from the phase terminal and the connection order from the neutral point is prescribed. Since magnetic coupling occurs between the unit coils on the phase terminal side and the unit coils on the neutral point side, resonance phenomena in the unit coils on the phase terminal side and the unit coils on the neutral point side that constitute the symmetric coil are suppressed. Therefore, a surge voltage due to resonance can be appropriately reduced.

[0030] In the seventh aspect according to the sixth aspect, in the series-connected coil group of at least any one phase, when an mth unit coil counted in the connection order from the phase terminal and an mth unit coil counted in the connection order from the neutral point are first symmetric coils in the n / 2 unit coils from the phase terminal to the neutral point, at least each first end of the first symmetric coils present from the phase terminal to the neutral point is accommodated in the same phase slot within the same magnetic pole.

[0031] Further, in the n / 2 unit coils from the neutral point to the neutral point, when an mth unit coil counted in the connection order from the neutral point and an mth unit coil counted in the connection order from the neutral point are second symmetric coils, at least each first end of the second symmetric coils present from the phase terminal to the neutral point is accommodated in the same phase slot within the same magnetic pole.

[0032] In the phase coil of the stator winding, in addition to the primary resonance based on the switching frequency, a secondary resonance also occurs. In view of this, according to the present aspect, in the series-connected coil group of the phase coil, magnetic coupling occurs between a first symmetric coil and a second symmetric coil, thereby suppressing the secondary resonance, wherein the first symmetric coil is the n / 2 unit coils from the phase terminal to the neutral point, and the second symmetric coil is the n / 2 unit coils from the neutral point to the neutral point. Thus, an increase in the voltage difference (shared voltage) between the unit coils due to the secondary resonance can be suppressed.

[0033] The eighth aspect provides a rotary electric machine including: a stator having a stator core and a stator winding, the stator core having a plurality of slots arranged in a circumferential direction, the stator winding having a plurality of phase coils wound in the slots; and a rotor arranged opposite the stator in a radial direction and having a plurality of magnetic poles in the circumferential direction.

[0034] In the rotary electric machine, each phase coil has a plurality of series-connected coil groups, each of the series-connected coil groups including n unit coils arranged to be wound in the circumferential direction. A first end of each series-connected coil group is connected to a phase terminal for each phase, a second end is connected to a neutral point, and the series-connected coil groups are connected to each other in parallel.

[0035] In at least any one of the phase coils, when a kth unit coil counted in the connection order from the phase terminal and a kth unit coil counted in the connection order from the neutral point are considered to be symmetric coils, at least each first end of the symmetric coils present from the phase terminal to the neutral point in the circumferential direction is accommodated in the same phase slot within the same magnetic pole.

[0036] In the rotating electric machine configured as described above, each phase coil of the stator winding has a plurality of series-connected coil groups, each of the series-connected coil groups including n unit coils. A first end of each of the series-connected coil groups is connected to a phase terminal of each phase, and a second end is connected to a neutral point. In this state, the series-connected coil groups are connected to each other in parallel. In this case, this configuration is advantageous in achieving a higher output in the rotating electric machine.

[0037] Further, in the stator winding, in the phase coil, due to a high-frequency component generated accompanying switching during energization of the coil, a resonance phenomenon can occur in opposite directions between unit coils of different numbers counted in the connection order from the phase terminal. It can be considered that a voltage difference (shared voltage) between the unit coils is thereby increased.

[0038] More specifically, it can be considered that a resonance phenomenon occurs in opposite directions between the kth unit coil counted in the connection order from the phase terminal and the kth unit coil counted in the connection order from the neutral point. This is thought to cause a decrease in the insulation performance of the stator winding.

[0039] In view of this, according to the present aspect, in the phase coil, when a combination of the kth unit coil counted in the connection order from the phase terminal and the kth unit coil counted in the connection order from the neutral point is considered to be a symmetric coil, at least each first end of the symmetric coil present in the circumferential direction from the phase terminal to the neutral point is accommodated in a slot of the same phase within the same magnetic pole.

[0040] In this case, due to magnetic coupling between the unit coil of the phase terminal side and the unit coil of the neutral point side, a resonance phenomenon in the unit coil of the phase terminal side and the unit coil of the neutral point side constituting the symmetric coil can be suppressed. That is, due to the voltage at one unit coil in the slot of the same phase within the same magnetic pole being transmitted to the voltage at the other unit coil, elimination of the resonance voltage can be achieved. As a result, an increase in the voltage difference (shared voltage) between the unit coils can be suppressed. Further, an increase in the insulation performance can be appropriately achieved.

[0041] The ninth aspect according to the eighth aspect, wherein the series-connected coil groups include unit coils wound on a first side in the circumferential direction from the phase terminal to the neutral point, and unit coils wound on a second side in the circumferential direction, each of the series-connected coil groups is provided in a circumferential direction region smaller than a single turn around the stator core, and series-connected coil groups different from each other are arranged in line in the circumferential direction.

[0042] In the configuration described above, in the series-connected coil groups, the unit coils provided to be wound in the circumferential direction are arranged to be folded back in the circumferential direction toward the reverse side. Further, each series-connected coil group is provided in a circumferential direction region smaller than a single turn around the stator core. The series-connected coil groups different from each other are arranged to be aligned in the circumferential direction. Thus, a configuration can be appropriately obtained in which at least each first end of the symmetrical coils is accommodated in a slot of the same phase within the same magnetic pole in the circumferential direction.

[0043] The tenth aspect according to the eighth or ninth aspect, wherein, in the series-connected coil group of at least any one phase, in the n / 2 unit coils from the phase terminal to the neutral point, when an mth unit coil counted in the connection order from the phase terminal and an mth unit coil counted in the connection order from the neutral point are the first symmetrical coils, at least each first end of the first symmetrical coils present from the phase terminal to the neutral point is accommodated in a slot of the same phase within the same magnetic pole.

[0044] Further, in the n / 2 unit coils from the neutral point to the intermediate point, when an mth unit coil counted in the connection order from the neutral point and an mth unit coil counted in the connection order from the intermediate point are the second symmetrical coils, at least each first end of the second symmetrical coils present from the phase terminal to the intermediate point is accommodated in a slot of the same phase within the same magnetic pole.

[0045] In the phase coils of the stator winding, in addition to the main resonance based on the switching frequency, a secondary resonance also occurs. In view of this, according to the present aspect, in the series-connected coil group of the phase coil, magnetic coupling occurs between a first symmetrical coil and a second symmetrical coil, thereby suppressing the secondary resonance, wherein the first symmetrical coil is the n / 2 unit coils from the phase terminal to the neutral point, and the second symmetrical coil is the n / 2 unit coils from the neutral point to the intermediate point. The secondary resonance is suppressed due to the magnetic coupling therebetween. Thus, an increase in the voltage difference (shared voltage) between the unit coils due to the secondary resonance can be suppressed.

[0046] The eleventh aspect according to any one of the first aspect to the tenth aspect, wherein the number of slots for each phase of each magnetic pole in the stator core is 2x, wherein x is a natural number. The phase coil has a crossover portion connecting the unit coils to each other in the series-connected coil group. The unit coils are provided such that the conductive wire wound by the lap winding is aligned in the radial direction in the slots in multiple layers, and the slot pitch in the circumferential direction in which the unit coils are accommodated in the slots is y slot pitches equivalent to the slot pitch of a single magnetic pole. The crossover portion is provided with at least any one of y slot pitches, y−1 slot pitches, and y+1 slot pitches.

[0047] In the configuration described above, the unit coils are arranged such that the wires wound by overlapping windings are arranged in multiple layers radially within the slots. Unit coils adjacent to each other in the circumferential direction are connected to each other by bridging portions at their innermost or outermost points in the radial direction. In this case, unit coils in the same phase are housed in a configuration with two slots for each phase of each magnetic pole, and bridging portions are provided at at least one slot spacing of y slot spacing and y±1 slot spacing. As a result, a configuration suitable for reversing the extension direction (winding orientation in the circumferential direction) at the bridging portions is obtained. Furthermore, the length of the bridging portions can be made as short as possible. Attached Figure Description

[0048] In the attached diagram:

[0049] FIG. 1 This is a cross-sectional view of the overall structure of the rotating electric machine;

[0050] FIG. 2 It is a 3D view of the stator core;

[0051] FIG. 3A and FIG. 3B It is a circuit diagram of the electrical structure of the stator winding;

[0052] FIG. 4 It is a construction diagram of a unit coil with an overlapping winding structure;

[0053] FIG. 5 It is a diagram showing the state of the wires being housed in the slot;

[0054] FIG. 6 This is a structural diagram of the conductor section;

[0055] FIG. 7 It is a diagram showing the relationship between the stacking thickness of the stator core (composed of laminated steel plates), surge voltage, and coil connections;

[0056] FIG. 8 This is a graph showing the increase in the voltage difference (sharing voltage) between coils caused by surge voltage;

[0057] FIG. 9 This is a diagram of stator windings connected in series;

[0058] FIG. 10 It is a diagram showing the winding state of the stator windings connected in series;

[0059] FIG. 11 It is a diagram showing the winding state of the stator windings connected in series;

[0060] FIG. 12 It is a diagram showing the winding state of the stator windings connected in parallel;

[0061] FIG. 13It is a diagram showing the winding state of the stator windings connected in parallel;

[0062] FIG. 14A to FIG. 14C This is a diagram used to illustrate the resonant current and surge voltage in the phase coil;

[0063] FIG. 15A and FIG. 15B This is a diagram showing the slot locations for the unit coil;

[0064] FIG. 16 This is a diagram of the electrical structure of the phase coil;

[0065] FIG. 17A to FIG. 17C This is a diagram used to illustrate the resonant current and surge voltage in the phase coil;

[0066] FIG. 18A to FIG. 18C This is a diagram used to illustrate the resonant current and surge voltage in the phase coil;

[0067] FIG. 19A to FIG. 19C This is a diagram used to illustrate the resonant current and surge voltage in the phase coil;

[0068] FIG. 20 It is a diagram showing the winding state of the stator windings connected in parallel;

[0069] FIG. 21A and FIG. 21B This is a diagram showing the slot locations for the unit coil;

[0070] FIG. 22 This is a diagram of the electrical structure of the phase coil;

[0071] FIG. 23A to FIG. 23C This is a diagram used to illustrate the resonant current and surge voltage in the phase coil;

[0072] FIG. 24 This is a graph showing the behavior of surge voltage relative to time;

[0073] FIG. 25 It is a diagram showing the winding state of the stator windings connected in parallel;

[0074] FIG. 26A and FIG. 26B This is a diagram showing the slot locations for the unit coil;

[0075] FIG. 27 This is a diagram showing the coil connections in the stator winding according to the second embodiment;

[0076] FIG. 28 It is a diagram showing the winding state of the stator windings connected in parallel;

[0077] FIG. 29 This is a diagram showing the slot locations for the unit coil;

[0078] FIG. 30 It is a diagram showing the winding state of the stator windings connected in parallel;

[0079] FIG. 31 This is a diagram showing the slot locations for the unit coil;

[0080] FIG. 32 It is a diagram showing the winding state of the stator windings connected in parallel;

[0081] FIG. 33 This is a diagram showing the slot locations for the unit coil;

[0082] FIG. 34A and FIG. 34B This is a perspective view of the stator structure according to the third embodiment;

[0083] FIG. 35 It is a diagram showing the connection sequence of multiple unit coils in the stator core;

[0084] FIG. 36A to FIG. 36C It is a diagram of the overall structure of the conductor section;

[0085] FIG. 37A and FIG. 37B This is an enlarged three-dimensional view of the structure at the ends of the stator coils. Detailed Implementation

[0086] (First Implementation)

[0087] The following describes an embodiment of the rotary motor of the present invention. According to this embodiment, the rotary motor is implemented as a driving motor for generating driving power (torque) for an electric vehicle.

[0088] First, the overall structure of the rotary motor 10 will be explained. FIG. 1 This is a cross-sectional view of the overall structure of the rotary motor 10 according to this embodiment. In the following description, the direction in which the rotation center axis of the rotary motor 10 extends is the axial direction D1. The direction extending radially from the rotation center is the radial direction D2. The direction extending circumferentially around the rotation center axis is the circumferential direction D3. FIG. 1 As shown, the rotary motor 10 is an internal rotor type three-phase AC rotary motor. The rotary motor 10 is constructed to include a housing 11, a rotor 20, and a stator 30.

[0089] The rotor 20 is constructed to include a rotating shaft 21, a rotor core 22, and permanent magnets 23. The rotor core 22 is fixed to the rotating shaft 21. Furthermore, the rotating shaft 21 is supported to the housing 11 by a set of bearings 12 and 13, allowing it to rotate freely. Multiple permanent magnets 23 are arranged at predetermined intervals along the circumferential direction D3 of the rotor core 22. The permanent magnets 23 are magnetized such that their polarities alternate along the circumferential direction D3. As a result, multiple magnetic poles are formed along the circumferential direction D3. Here, for example, the structure of the rotor 20 can be replaced by various known types, such as a winding-field type where the excitation winding is wound around a claw-pole core.

[0090] The stator 30 is disposed on the outer side along the radial direction of the rotor 20. The stator 30 is configured to include a stator core 31 and a stator winding 32. The stator core 31 has a cylindrical shape and is fixed to the inner circumferential side of the peripheral wall of the housing 11. The stator core 31 is composed of laminated steel plates on which electromagnetic steel plates are stacked along the axial direction D1. FIG. 2 As shown, the stator core 31 has an annular support yoke 33 and a plurality of pole teeth 34 extending inwardly from the support yoke 33 along the radial direction D2. Slots 35 are formed between the pole teeth 34 in a spaced manner. The rotary motor 10 according to this embodiment has eight magnetic poles, four pole pairs, and two phase slots for each magnetic pole. Forty-eight slots 35 are formed in the stator core 31 along the circumferential direction D3.

[0091] The stator winding 32 is wound in the slot 35 of the stator core 31. Furthermore, the first coil end of the stator winding 32 protrudes axially from the first end face of the stator core 31 along the axial direction D1. The second coil end of the stator winding 32 protrudes axially from the second end face of the stator core 31 along the axial direction D1.

[0092] FIG. 3A and FIG. 3B This is a circuit diagram of the electrical structure related to stator winding 32. For example... FIG. 3A As shown, the stator winding 32, as phase coils, has a U-phase coil 32U, a V-phase coil 32V, and a W-phase coil 32W. Since the phase coils 32U, 32V, and 32W are connected at the neutral point N, the stator winding 32 is configured with a star connection (Y connection). According to this embodiment, each of the phase coils 32U, 32V, and 32W has a winding structure with double parallel connections.

[0093] like FIG. 3BAs shown, phase coils 32U, 32V, and 32W each have two series-connected coil groups G1 and G2 (series connectors) made of multiple unit coils. Phase coils 32U, 32V, and 32W are configured such that the series-connected coil groups G1 and G2 are connected in parallel. Each unit coil is wound across two slots separated by a predetermined slot spacing. The unit coil is formed by coil wire wound in an overlapping manner. Furthermore, multiple unit coils are connected in series because they are connected to each other via bridging portions.

[0094] FIG. 4 The construction of a unit coil 41 with an overlapping winding structure is shown. Here, in FIG. 4 In the axial direction ( FIG. 4 The area marked by CS (in the up / down direction) is the coil side, in which the wire is accommodated within the slot 35. The area marked by CE is the coil end, in which the wire protrudes axially from the slot 35. According to this embodiment, multiple unit coils 41 are formed using wire CR made of flat wire having a generally rectangular cross-section, such that the wire CR is wound in an overlapping manner to form multiple layers. According to this embodiment, the unit coils 41 have the same number of turns. Furthermore, the portion connecting the unit coils 41 to each other is the bridging portion 42. Here, the wire CR can be a winding wire having a circular cross-section.

[0095] like FIG. 5 As shown, the conductor CR is arranged in slots 35 of the stator core 31 so as to be arranged in multiple layers in the radial direction. In this case, the conductor CR is wound sequentially from the outside or from the inside in the radial direction through overlapping windings. Because the conductor CR is wound in this way, a number of conductors equivalent to the number of turns are arranged in an array in the radial direction within the slots 35.

[0096] For example, as a conductor CR, it can be used FIG. 6 The conductor segment 50 is shown. The conductor segment 50 is formed such that the flat conductor is bent into a generally U-shape. The conductor segment 50 has a pair of straight portions 51 and a bend 52 connecting the pair of straight portions 51. The length of the straight portions 51 is greater than the axial length of the stator core 31. The tip portion of the straight portion 51 opposite to the end of the bend 52 is an edge portion 53. In this case, with the conductor segment 50 inserted into the slot 35, the edge portion 53 of the straight portion 51 protrudes from the slot 35. The individual edge portions 53 of the different conductor segments 50 are joined together by welding or the like, thereby connecting the conductor segments 50 to each other.

[0097] Here, instead of a segment structure that uses multiple conductor segments 50, the unit coil 41 of the phase coil can also be constructed using continuous wires.

[0098] Return toFIG. 3B The construction of phase coils 32U, 32V, and 32W will be described below. Here, phase coils 32U, 32V, and 32W each include multiple unit coils 41. In the following description, for convenience, the unit coil 41 included in phase coil 32U is referred to as unit coil U. The unit coil 41 included in phase coil 32V is referred to as unit coil V. The unit coil 41 included in phase coil 32W is referred to as unit coil W.

[0099] The U-phase coil 32U includes a series-connected coil group G1 and a series-connected coil group G2, configured such that the series-connected coil groups G1 and G2 are connected in parallel. The series-connected coil group G1 consists of eight unit coils U11, U12, U13, U14, U15, U16, U17, and U18 connected in sequence. The series-connected coil group G2 consists of eight unit coils U21, U22, U23, U24, U25, U26, U27, and U28 connected in sequence. In the U-phase coil 32U, the first end of each of the series-connected coil groups G1 and G2 on the unit coil U11 or unit coil U21 side is connected to the U-phase terminal T1. The second end of each of the series-connected coil groups G1 and G2 on the unit coil U18 or unit coil U28 side is connected to the neutral point N. Here, according to this embodiment, the number of coils, n, in each of the series-connected coil groups G1 and G2 is 8.

[0100] Similarly, the V-phase coil 32V includes coil groups G1 and G2 connected in series, and is configured such that the series-connected coil groups G1 and G2 are connected in parallel. The series-connected coil group G1 consists of eight unit coils V11, V12, V13, V14, V15, V16, V17, and V18 connected in sequence. The series-connected coil group G2 consists of eight unit coils V21, V22, V23, V24, V25, V26, V27, and V28 connected in sequence. In the V-phase coil 32V, the first end of each of the series-connected coil groups G1 and G2 on the unit coil V11 or unit coil V21 side is connected to the V-phase terminal T2. The second end of each of the series-connected coil groups G1 and G2 on the unit coil V18 or unit coil V28 side is connected to the neutral point N.

[0101] Similarly, the W-phase coil 32W includes a series-connected coil group G1 and a series-connected coil group G2, configured such that the series-connected coil groups G1 and G2 are connected in parallel. The series-connected coil group G1 consists of eight unit coils W11, W12, W13, W14, W15, W16, W17, and W18 connected in sequence. The series-connected coil group G2 consists of eight unit coils W21, W22, W23, W24, W25, W26, W27, and W28 connected in sequence. In the W-phase coil 32W, the first end of each of the series-connected coil groups G1 and G2 on the unit coil W11 side or the unit coil W21 side is connected to the W-phase terminal T3. The second end of each of the series-connected coil groups G1 and G2 on the unit coil W18 side or the unit coil W28 side is connected to the neutral point N.

[0102] like FIG. 3A As shown, inverter 61 is connected between battery 60 and phase terminals T1 to T3. Inverter 61 has multiple switching elements. Specifically, inverter 61 is a full-bridge circuit with the same number of upper arms and lower arms as the number of phases of stator winding 32. Inverter 61 constitutes a three-phase full-wave rectifier circuit. Inverter 61 constitutes a drive circuit that drives the rotating motor 10 by regulating the power supplied to it. That is, inverter 61 has switches Sp and Sn as switching elements for each phase. The intermediate connection point of the series connection formed by the switches Sp and Sn for each phase is connected to the corresponding phase terminals T1 to T3 of the phase coils 32U, 32V, and 32W. Since switching is performed in inverter 61, the current flowing to the rotating motor 10 is regulated.

[0103] Inverter 61 includes an upper arm switch Sp and a lower arm switch Sn for each phase. According to this embodiment, voltage-controlled semiconductor switching elements are used for each of the switches Sp and Sn. Specifically, an N-channel metal-oxide-semiconductor field-effect transistor (MOSFET) is used. The upper arm diode Dp is connected in reverse parallel to the upper arm switch Sp. The lower arm diode Dn is connected in reverse parallel to the lower arm switch Sn. According to this embodiment, the body diodes of switches Sp and Sn are used as diodes Dp and Dn. Here, the diodes are not limited to body diodes. For example, diodes that are components separate from switches Sp and Sn can be used.

[0104] When the vehicle is driven, the switching operations of switches Sp and Sn are performed appropriately based on commands from controller 62. A three-phase AC voltage is applied from battery 60 to stator winding 32 via inverter 61. Rotor 20 rotates due to the applied voltage. The rotating shaft 21 of rotor 20 is directly connected to the crankshaft of the engine (not shown). Alternatively, the rotating shaft 21 of rotor 20 is connected to the crankshaft via a clutch, gears, etc. When the rotating shaft 21 of rotor 20 is directly connected to the crankshaft, the engine is started by the rotation of the rotating shaft 21 of rotor 20.

[0105] The rotary motor 10 can be constructed as described below.

[0106] That is, in the internal rotor type rotary motor 10, when the value obtained by dividing the outer diameter of the stator 30 (i.e., the diameter of the outer periphery of the stator 30) by the outer diameter of the rotor 20 (i.e., the diameter of the outer periphery of the rotor 20) is the ratio of the outer diameters of the stator 30 and the rotor 20, the ratio of the outer diameters is 1.2 or more and 1.7 or less.

[0107] When the ratio of the stack thickness of the stator core 31 (i.e., the core thickness dimension along the axial direction) to the outer diameter of the rotor 20 (i.e., the diameter of the outer circumference of the rotor 20) is the ratio of the stack thickness to the rotor outer diameter, the ratio is equal to or greater than 0.6. In this configuration, the rotary motor 10 is an elongated shaft type rather than a flat type. The rotary motor 10 is designed for high voltage.

[0108] When the ratio of the coil end height on the first side of the stator 30 to the stack thickness of the stator core 31 (i.e., the core thickness dimension in the axial direction) is the ratio of the coil end height to the stack thickness, the ratio is equal to or less than 0.25. In the stator winding 32 having the segment structure described above, the coil end height is lower. The output density can be increased.

[0109] The detailed construction of the winding structure of the stator 30, including the characteristic portions according to this embodiment, will be described below. However, before describing the detailed construction according to this embodiment, the development process of the rotary electric machine 10 according to this embodiment and the winding structure of another stator used as a comparative example will be described here.

[0110] The technical background leading to the development of the rotary motor 10 according to this embodiment is as follows. Specifically, in recent years, with the implementation of regulations concerning gas emissions, the transition from gasoline and diesel engine vehicles to electric vehicles such as hybrid vehicles, fuel cell vehicles, and electric vehicles has been promoted worldwide. Among these electric vehicles, the focus has been placed on fuel cell vehicles and electric vehicles, which have lower exhaust emissions.

[0111] However, in fuel cell vehicles and electric vehicles, the drive power provided during driving cannot be distributed between engine and electric motor outputs as in hybrid vehicles. Under all driving conditions, drive power must be provided solely from the output of the electric motor.

[0112] As a result, the electric motors in fuel cell vehicles or electric cars need to provide greater output compared to the electric motors in hybrid vehicles. Simultaneously, the electric motors in fuel cell vehicles or electric cars need to be able to travel longer distances with less hydrogen or fewer charging cycles. The electric motors in fuel cell vehicles or electric cars also require smaller size, lighter weight, and higher efficiency. To obtain greater output from the electric motor, two measures can be considered: increasing the rotational speed and increasing the torque (increasing the diameter or increasing the stack thickness). However, considering the vehicle's speed, increasing the torque is appropriate.

[0113] Furthermore, considering the differences in required torque based on vehicle size, increasing the lamination thickness is an effective measure to reduce manufacturing costs, because if the cross-sectional shape is the same, the pressed electromagnetic steel sheet can be used as a common component. Therefore, many companies use the method of increasing the lamination thickness. However, if the lamination thickness is increased, two problems arise, as described below.

[0114] First, the induced voltage generated during motor regeneration increases proportionally to the laminate thickness. If the induced voltage exceeds the inverter's output voltage limit, control can no longer be executed. As a means to prevent this problem, such as... FIG. 7 As shown, one could consider changing the number of series connections by connecting some of the coils in the motor in parallel, in order to prevent the induced voltage from exceeding the inverter's output voltage limit.

[0115] Second, it is known that a transient voltage surge, known as inrush voltage, occurs during inverter switching. For example... FIG. 8 As shown, with the generation of surge voltage, the voltage difference (shared voltage) between coils increases. Furthermore, since surge voltage increases with increasing laminate thickness, the maximum voltage generated between coils in the motor tends to increase.

[0116] In this situation, a weak discharge phenomenon known as partial discharge occurs when the maximum voltage between the coils exceeds the withstand voltage between the wires used in the coils. The insulating film layer on the surface of the wires becomes damaged. A short circuit fault may eventually occur between the coils. To prevent this short circuit fault, the thickness of the insulating film layer needs to be increased to increase the withstand voltage between the wires. However, since the size of the motor needs to be increased by an amount equivalent to the thickness of the film layer while maintaining the same output, it is difficult to simultaneously achieve short circuit fault prevention and size and weight reduction.

[0117] In view of the problems described above, a rotary motor 10 according to this embodiment has been realized. In the high-output rotary motor 10 for electric vehicles, even with increased thickness and parallel connection, the increase in the maximum voltage between the coils can be suppressed. This results in reduced size and weight, as well as high insulation reliability.

[0118] The winding structure is used as a comparative example. FIG. 9 to FIG. 11 The diagram shows the structure of a stator 30 in which the unit coils of phase coils 32U, 32V, and 32W are connected but not in parallel. In the accompanying drawings, FIG. 9 It shows FIG. 10 and FIG. 11 The stator winding 32 of the stator 30 is shown in the diagram. Here, FIG. 10 and FIG. 11 The stator 30 shown has a different construction from the stator 30 used in the rotary motor 10 according to this embodiment. However, for convenience, the same reference numerals are used.

[0119] like FIG. 9 As shown, the U-phase coil 32U has a total of sixteen unit coils U1, U2, U3, ..., U16 connected in series between the U-phase terminal T1 and the neutral point N. Similarly, the V-phase coil 32V has a total of sixteen unit coils V1, V2, V3, ..., V16 connected in series between the V-phase terminal T2 and the neutral point N. The W-phase coil 32W has a total of sixteen unit coils W1, W2, W3, ..., W16 connected in series between the W-phase terminal T3 and the neutral point N.

[0120] FIG. 10 and FIG. 11 The connection sequence of the unit coils is shown, starting from the U-phase terminal T1 in the stator winding 32, which uses only series connections and not parallel connections. FIG. 10 and FIG. 11 This is a diagram showing the connection sequence of multiple unit coils in stator core 31 from a plan view. FIG. 10 and FIG. 11 Of the three phase coils 32U, 32V, and 32W, only the U-phase coil 32U is shown. Furthermore, in... FIG. 10 and FIG. 11 For ease of description, two stator cores 31 with the same orientation are shown on the left and right sides. In the left and right figures, numbers 1 to 48 are used as slot numbers in a counterclockwise order.

[0121] In addition, FIG. 10 and FIG. 11In the diagram, the connection sequence is indicated by arrows starting from the U-phase terminal T1 and ending at the neutral point N. In the connection portion of each unit coil connected at a predetermined slot spacing, the connection portion located on the first end side of the stator 30 along the axial direction is indicated by a solid arrow. The connection portion located on the second end side of the stator 30 along the axial direction is indicated by a dashed arrow. Among the arrow portions indicated by dashed lines, the portion extending radially inward or outward beyond the slots of the stator core 31 is the bridging portion connecting the unit coils. Although not shown, this also applies to the construction of the other phase coils, namely the V-phase coil 32V and the W-phase coil 32W. Here, the aspects of the figures are also the same in similar figures described below.

[0122] exist FIG. 10 In the configuration, as shown in the left figure, unit coils U1 to U8 are arranged to be wound clockwise as the first turn, starting from phase terminal T1. Furthermore, as shown in the right figure, unit coils U9 to U16 are arranged to be wound clockwise as the second turn. In this configuration, the slots accommodating the first turn of unit coils U1 to U8 are numbered 4, 46, 40, 34..., while the slots accommodating unit coils U9 to U16 are numbered 5, 47, 41, 35,... The first and second turns of unit coils are arranged to be staggered by a single slot in the circumferential direction.

[0123] In addition, FIG. 11 In the construction, as shown in the left figure, unit coils U1 to U8 are arranged to be wound clockwise as the first turn, starting from phase terminal T1 of U. Furthermore, as shown in the right figure, unit coils U9 to U16 are arranged to be wound counterclockwise as the second turn. In this construction, the slot numbers for the first turn of unit coils U1 to U8 coincide with the slot numbers for the second turn of unit coils U9 to U16, and in both turns are 5, 4, 47, 46, 41, 40, 35, 34, ...

[0124] FIG. 10 and FIG. 11 The winding structure that does not use parallel connections is simply changed to FIG. 12 and FIG. 13 The winding structure uses parallel connections. FIG. 12 and FIG. 13 The electrical configuration of the stator winding 32 shown is consistent with... FIG. 3B The electrical configuration is the same. This configuration allows the two series-connected coil groups G1 and G2 to be connected in parallel with each other. That is, in FIG. 12 and FIG. 13 In the configuration shown, the U-phase coil 32U has unit coils U11 to U18 as coil group G1 connected in series and unit coils U21 to U28 as coil group G2 connected in series.

[0125] In these constructions, FIG. 12 In the construction, as shown in the left figure, the first series-connected coil group G1 is arranged such that the unit coils U11 to U18 are wound clockwise starting from the U-phase terminal T1. Furthermore, as shown in the right figure, the second series-connected coil group G2 is arranged such that the unit coils U21 to U28 are wound clockwise starting from the U-phase terminal T1. In this case, the slots accommodating the unit coils U11 to U18 of the first series-connected coil group G1 are numbered 4, 46, 40, 34, ..., while the slots accommodating the unit coils U21 to U28 of the second series-connected coil group G2 are numbered 5, 47, 41, 35, ... . The unit coils U21 to U28 of the second series-connected coil group G2 are arranged to be staggered by a single slot from the unit coils U11 to U18 of the first series-connected coil group G1 in the circumferential direction.

[0126] In this configuration, in the first series-connected coil group G1 and the second series-connected coil group G2, the receiving slots accommodating the corresponding unit coils in terms of their connection sequence starting from the phase terminals are staggered by a single slot. As a result, a phase difference arises between the induced voltages generated in the unit coils U11 to U18 of the series-connected coil group G1 and the induced voltages generated in the unit coils U21 to U28 of the series-connected coil group G2. Therefore, in the parallel connection configuration of the first series-connected coil group G1 and the second series-connected coil group G2, the generation of circulating current that does not contribute to the output becomes problematic. In view of this, FIG. 12 The structure in it has drawbacks.

[0127] At the same time, FIG. 13 In the construction, as shown in the left figure, the first series-connected coil group G1 is arranged such that the unit coils U11 to U18 are wound clockwise starting from the U-phase terminal T1. Furthermore, as shown in the right figure, the second series-connected coil group G2 is arranged such that the unit coils U21 to U28 are wound counterclockwise starting from the U-phase terminal T1. In this case, the slot numbers accommodating the unit coils U11 to U18 of the first series-connected coil group G1 coincide with the slot numbers accommodating the unit coils U21 to U28 of the second series-connected coil group G2, and in both cases are 5, 4, 47, 46, 41, 40, 35, 34, ... Therefore, in the construction of the first series-connected coil group G1 and the second series-connected coil group G2 connected in series, the generation of circulating current is suppressed.

[0128] exist FIG. 13In the first series-connected coil group G1, unit coils U11 to U18 are connected in series via bridging portions A11 to A17. When viewed from the U-phase terminal T1, the bridging directions of bridging portions A11 to A17 (corresponding to the winding direction along the circumferential direction) are all clockwise. In the second series-connected coil group G2, unit coils U21 to U28 are connected in series via bridging portions A21 to A27. When viewed from the U-phase terminal T1, the bridging directions of bridging portions A21 to A27 are all counterclockwise.

[0129] The slot spacing of unit coils U11 to U18 and unit coils U21 to U28 are both six slot spacings, which is equivalent to the slot spacing of a single magnetic pole. Furthermore, in bridging portions A11 to A17 and A21 to A27, the bridging portions A11, A13, ..., A21, A23, etc., arranged radially on the inner side have five slot spacings. The bridging portions A12, A14, ..., A22, A24, etc., arranged radially on the outer side have seven slot spacings. When the magnetic pole spacing is summarized as y slot spacings, the bridging portions located radially on the inner side are provided with (y-1) slot spacings, and the bridging portions located radially on the outer side are provided with (y+1) slot spacings. Here, the structure of the bridging portion (the slot spacing of the bridging portion) can be a structure where the slot spacing located radially on the inner side and the slot spacing located radially on the outer side are the opposite of the structure described above.

[0130] Next, refer to FIG. 13 The parallel connection shown illustrates the principle behind the generation of the maximum potential difference between the coils.

[0131] The pulse width modulation (PWM) waveform on the rectangular wave output from the inverter contains frequency components at or above several hundred kHz. Parasitic capacitance exists between the stator core 31 and the stator winding 32, as well as between the coils. A portion between the coils is used as a capacitor. Here, these parasitic capacitances are represented by parasitic capacitance C.

[0132] At the instant the inverter performs a switching operation, resonance occurs in the phase coils 32U, 32V, and 32W due to the parasitic capacitance and coil inductance between the stator core 31 and the stator winding 32. This resonance can be considered to occur in opposite directions between the different numbered unit coils, starting from the phase terminal of each phase, thus increasing the voltage difference (shared voltage) between the unit coils. (Refer to...) FIG. 14A to FIG. 14C To describe this principle. Here, in FIG. 14A The reference numerals for the accompanying drawings have been omitted. However, FIG. 14A The winding structure shown is similar to FIG. 3BThe winding structure is the same as that in the previous section. Here, the problems involved by the stator winding 32 with a double parallel connection will be described.

[0133] like FIG. 14A As shown, at the instant the inverter performs a switching operation, the resonant current Ir (surge current) flows to each unit coil through the parasitic capacitance C, and resonance occurs. Here, FIG. 14A The direction of the arrow in the diagram indicates the orientation of the resonant current Ir. The thickness of the arrow indicates the magnitude of the resonant current Ir.

[0134] At this point, the symmetrical resonant current Ir flows through the unit coils on the phase terminal side and the neutral point N side of each phase. That is, the resonant current Ir flowing to the unit coils on the phase terminal side and the resonant current Ir flowing to the unit coils on the neutral point N side flow in opposite directions. Furthermore, the resonant current Ir increases towards the phase terminal and the neutral point N. At the midpoint between the phase terminal and the neutral point N, the resonant current Ir is zero. FIG. 14A In the diagram, the surge voltage Vs generated by the resonant current Ir is represented by an arrow. The direction and thickness of the arrow correspond to the orientation (polarity or application direction) and magnitude of the surge voltage Vs, respectively.

[0135] FIG. 14B The surge voltage Vs at each unit coil of phase V is shown. In this case, the direction of the resonant current Ir is different between the unit coil on the phase terminal side and the unit coil on the neutral point N side. Therefore, the polarity of the surge voltage Vs is different. Here, the orientation of the surge voltage Vs generated between the unit coils is opposite between the U-phase coil 32U and the V-phase coil 32V.

[0136] As described above, when a surge voltage Vs is generated in the phase coil, for example, between the U-phase coil 32U and the V-phase coil 32V, a resonant voltage is generated, consisting of the sum of the surge voltages Vs at the unit coils of the U-phase coil 32U and the V-phase coil 32V. This resonant voltage is obtained by adding the surge voltage Vs of the U-phase coil 32U to the surge voltage Vs of the V-phase coil 32V. FIG. 14C As shown, the resonant voltage is generated between the phase terminal and the neutral point N, and reaches its maximum value at the midpoint between the phase terminal and the neutral point N. This is the main resonance generated at the lowest frequency in the resonance phenomenon. That is, a main resonance is generated between the phase terminal and the neutral point N, where the phase terminal and the neutral point N are nodes and the midpoint between the phase terminal and the neutral point N is an anti-node.

[0137] To suppress resonance in the stator winding 32, the rotary motor 10 according to this embodiment is configured such that the first ends of the unit coils that generate surge voltages in different directions are housed in the same or adjacent slots in the circumferential direction. Hereinafter, as a configuration suitable for suppressing the main resonance, the above-described configuration will be described again. FIG. 13 The structure in.

[0138] exist FIG. 13 In the construction, in the first series-connected coil group G1, the unit coils U11 to U18 are arranged to be wound in a clockwise direction. In the second series-connected coil group G2, the unit coils U21 to U28 are arranged to be wound in a counterclockwise direction.

[0139] Here, we will refer to FIG. 15A and FIG. 15B This describes the slot accommodating position of the unit coil. Here, when the series-connected coil groups G1 and G2 are divided into four from the U-phase terminal T1 to the neutral point N, the series-connected coil groups G1 and G2 have:

[0140] The first coil group Ua includes unit coils U11, U12, U21, and U22;

[0141] The second coil group Ub includes unit coils U13, U14, U23, and U24.

[0142] The third coil group Uc, which includes unit coils U15, U16, U25, and U26; and

[0143] The fourth coil group Ud includes unit coils U17, U18, U27, and U28.

[0144] FIG. 15A This is a diagram showing the slot locations for the unit coils in the first coil group Ua and the fourth coil group Ud. FIG. 15B These are diagrams showing the slot locations for the unit coils in the second coil group Ub and the third coil group Uc. In these diagrams, the slots at the wire receiving locations of each unit coil are shaded.

[0145] like FIG. 15A and FIG. 15B As shown, in the U-phase coil 32U, when the kth unit coil counted in the connection sequence starting from the U-phase terminal T1 and the kth unit coil counted in the connection sequence starting from the neutral point N are considered symmetrical coils, the configuration is such that at least each of the first ends of the symmetrical coils from the U-phase terminal T1 to the neutral point N in the circumferential direction are accommodated in the same phase slot within the same magnetic pole.

[0146] Specifically, when k=1, the symmetrical coils are: (i) a combination of unit coils U11 and U21; and (ii) a combination of unit coils U18 and U28. In this case, the first ends of unit coils U11 and U28 in the circumferential direction are accommodated in the same 46th slot. The first ends of unit coils U21 and U18 in the circumferential direction are accommodated in the same 5th slot. Furthermore, the first ends of unit coils U11 and U18 in the circumferential direction are accommodated in adjacent 4th and 5th slots. The first ends of unit coils U21 and U28 in the circumferential direction are accommodated in adjacent 46th and 47th slots.

[0147] When k = 2, the symmetrical coils are: (i) a combination of unit coils U12 and U22; and (ii) a combination of unit coils U17 and U27. In this case, the first ends of unit coils U12 and U27 in the circumferential direction are accommodated in the same 41st slot. The first ends of unit coils U22 and U17 in the circumferential direction are accommodated in the same 10th slot.

[0148] When k = 3, the symmetrical coils are: (ii) a combination of unit coils U13 and U23; and (ii) a combination of unit coils U16 and U26. In this case, the first ends of unit coils U13 and U26 in the circumferential direction are accommodated in the same 34th slot. The first ends of unit coils U23 and U16 in the circumferential direction are accommodated in the same 17th slot.

[0149] When k = 4, the symmetrical coils are: (i) unit coils U14 and U24; and (ii) a combination of unit coils U15 and U25. In this case, the first ends of unit coils U14 and U25 in the circumferential direction are accommodated in the same 29th slot. The first ends of unit coils U24 and U15 in the circumferential direction are accommodated in the same 22nd slot.

[0150] Due to the arrangement of the unit coils as described above, such as FIG. 16 As shown, mutual magnetic coupling can occur between coils housed in the same slot. This can reduce the surge voltage generated by the main resonance phenomenon. That is, the surge voltage generated by the main resonance is symmetrical between the phase terminal side and the neutral point N side, and their polarities are opposite. However, due to the magnetic coupling between the phase terminal side and the neutral point N side, based on the principle of a transformer, the surge voltage is transmitted between the phase terminal side and the neutral point N side through electromagnetic induction. As a result, the surge voltage is reduced.

[0151] exist FIG. 17AIn the diagram, the dashed arrow represents the induced voltage Vd generated due to the magnetic coupling between the phase terminal side and the neutral point N side. The induced voltage Vd is generated between the unit coils located symmetrically positioned between the phase terminal and the neutral point N (i.e., between the unit coils constituting the symmetrical coils). The result is as follows: FIG. 17B As shown, a voltage in the opposite direction to the surge voltage Vs generated in the unit coil is induced. This achieves the effect of suppressing the surge voltage generated between the coils. Furthermore, as... FIG. 17C As shown, the resonant voltage is reduced.

[0152] FIG. 13 The configuration shown ensures that in the U-phase coil 32U, the first end of the i-th unit coil in the circumferential direction, counting from the U-phase terminal T1, and the respective first ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction are housed in slots of the same phase within the same magnetic pole. Furthermore, the respective first and second ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction are also housed in slots of the same phase within the same magnetic pole. Here, when the numbering of the series-connected coils from the phase terminal to the neutral point N is n, i is any natural number from 1 to n, the n-th unit coil immediately precedes the 1st unit coil, and the 1st unit coil immediately follows the n-th unit coil.

[0153] When the coils connected in series from the phase terminal to the neutral point N are numbered n and i is any natural number from 1 to n, the i-th unit coil, the (i-1)-th unit coil, and the (i+1)-th unit coil can be defined as follows. That is, among the i-th, (i-1)-th, and (i+1)-th unit coils, the (i+1)-th unit coil can be defined as the (α+1)-th unit coil (α is the remainder when i is divided by n), and the (i-1)-th unit coil can be defined as the (β+1)-th unit coil (β is the remainder when i-2 is divided by n).

[0154] Specifically, such as FIG. 15A and FIG. 15B As shown, when i = 5, on the first end side (left end side in the figure) of unit coil U15, which is the fifth unit coil counting from phase terminal T1, the first end of unit coil U15 and the first ends of unit coils U14 and U26, which are the fourth and sixth unit coils respectively, are accommodated in slots of the same phase within the same magnetic pole. Furthermore, the first and second ends of unit coils U14 and U26 are also accommodated in slots of the same phase within the same magnetic pole.

[0155] Similarly, on the second end side (right end side in the figure) of unit coil U15 in the circumferential direction, the second end of unit coil 15 and the first ends of unit coils U24 and U16, which are the fourth and sixth unit coils, are accommodated in slots of the same phase within the same magnetic pole. Furthermore, the first and second ends of unit coils U24 and U16 in the circumferential direction are also accommodated in slots of the same phase within the same magnetic pole. Here, the foregoing description of unit coil 15 also applies to unit coil U25, which is also the fifth unit coil counted from phase terminal T1 (U phase).

[0156] In the rotary motor 10, in addition to the U-phase coil 32U, similar devices can also be used for the V-phase coil 32V and the W-phase coil 32W. FIG. 13 The winding structure in the circuit. As a result, the main resonance is appropriately suppressed in the phase coil of each phase.

[0157] Furthermore, the inventors of this invention have discovered that even in the same rotating electric motor, the resonance phenomenon described above occurs at multiple frequencies in different resonance modes. The secondary resonance occurring at approximately twice the primary resonant frequency will be described below.

[0158] The resonant period of the secondary resonance is half that of the primary resonance. For example... FIG. 18A As shown, a secondary resonance is generated because a symmetrical resonant current Ir flows between the phase point and the neutral point N, between the half (left half) on the phase terminal side and the half (right half) on the neutral point N side.

[0159] In this case, such as FIG. 18B As shown, a surge voltage Vs is generated in the opposite direction between the half of the phase terminal side and the half of the neutral point N side. Additionally, as... FIG. 18C As shown, a resonant voltage is generated between the phase terminal and the neutral point N. The resonant voltages on the positive and negative sides reach their maximum values ​​at the positions one-quarter and three-quarters of the way between the phase terminal and the neutral point N, respectively.

[0160] Here, as FIG. 19B As shown, under secondary resonance conditions, since a voltage is induced in the same direction as the surge voltage generated in each series-connected coil group, the surge voltage generated between the unit coils can be considered amplified. In this case, even when the surge voltage generated due to primary resonance is suppressed, the surge voltage generated due to secondary resonance is amplified. Therefore, the surge voltage generated due to secondary resonance becomes dominant, and the increase in the maximum voltage between the coils becomes a problem.

[0161] A suitable construction is one that can suppress secondary resonances. FIG. 20The structure shown.

[0162] exist FIG. 20 In its construction, in accordance with the above-described... FIG. 13 Similarly, the U-phase coil 32U has unit coils U11 to U18 as a first series-connected coil group G1, and unit coils U21 to U28 as a second series-connected coil group G2. Furthermore, as... FIG. 13 The difference in the construction is that in the series-connected coil groups G1 and G2, the unit coils are arranged such that the unit coils of each of the first series-connected coil group G1 and the second series-connected coil group G2 are wound in a manner that folds back in the middle position of the connection sequence starting from the U-phase terminal T1 in the circumferential direction.

[0163] Specifically, in the first series-connected coil group G1, unit coils U11 to U14 are arranged to be wound clockwise. The remaining unit coils U15 to U18 are arranged to be wound counterclockwise. Additionally, in the second series-connected coil group G2, unit coils U21 to U24 are arranged to be wound clockwise. The remaining unit coils U25 to U28 are arranged to be wound counterclockwise.

[0164] In this configuration, the first series-connected coil group G1 and the second series-connected coil group G2 each include a unit coil wound on a first side in the circumferential direction, starting from the U-phase terminal T1, and a unit coil wound on a second side in the circumferential direction. Furthermore, the first series-connected coil group G1 and the second series-connected coil group G2 are each positioned within a circumferential region smaller than a single turn surrounding the stator core 31. These series-connected coil groups, which are distinct from each other, are arranged in a circumferential configuration.

[0165] exist FIG. 20 In the construction, the bridging sections are arranged as follows. When viewed from the U-phase terminal T1, in the series-connected coil group G1, the bridging direction of bridging sections A11 to A13 is clockwise. The bridging direction of bridging sections A14 to A17 is counterclockwise. In this case, bridging section A14 is a reverse bridging section whose bridging direction is opposite to that of the previous bridging section A13. Furthermore, in the series-connected coil group G2, the bridging direction of bridging sections A21 to A23 is clockwise. The bridging direction of bridging sections A24 to A27 is counterclockwise. In this case, bridging section A24 is a reverse bridging section whose bridging direction is opposite to that of the previous bridging section A23.

[0166] The slot spacing of unit coils U11 to U18 and unit coils U21 to U28 are both six slots, which is equivalent to the slot spacing of a single magnetic pole. Furthermore, in bridging portions A11 to A17 and A21 to A27, the bridging portions A11, A13, ..., A21, A23, etc., arranged radially on the inner side have five slots. The bridging portions A12, A14, ..., A22, A24, etc., arranged radially on the outer side have six or seven slots.

[0167] Reference FIG. 21A and FIG. 21B This describes the slot location for the unit coil. FIG. 21A This is a diagram showing the slot locations of the unit coils in the series-connected coil group G1. FIG. 21B This is a diagram showing the slot locations of the unit coils in the series-connected coil group G2.

[0168] like FIG. 21A and FIG. 21B As shown, in the U-phase coil 32U, when the kth unit coil counted in the connection sequence starting from the U-phase terminal T1 and the kth unit coil counted in the connection sequence starting from the neutral point N are considered as symmetrical coils, this configuration is such that the respective first ends of the symmetrical coils from the U-phase terminal T1 to the neutral point N in the circumferential direction are accommodated in the same phase slot within the same magnetic pole.

[0169] Specifically, when k=1, the symmetrical coils are: (i) unit coils U11 and U21; and (ii) a combination of unit coils U18 and U28. In this case, the first ends of unit coils U11 and U18 in the circumferential direction are accommodated in the same fourth slot. The first ends of unit coils U21 and U28 in the circumferential direction are accommodated in the same twenty-eighth slot.

[0170] When k = 2, the symmetrical coils are: (i) a combination of unit coils U12 and U22; and (ii) a combination of unit coils U17 and U27. In this case, the first ends of unit coils U12 and U17 in the circumferential direction are accommodated in the same 47th slot. The first ends of unit coils U22 and U27 in the circumferential direction are accommodated in the same 23rd slot.

[0171] When k = 3, the symmetrical coils are: (ii) a combination of unit coils U13 and U23; and (ii) a combination of unit coils U16 and U26. In this case, the first ends of unit coils U13 and U16 in the circumferential direction are accommodated in the same 40th slot. The first ends of unit coils U23 and U26 in the circumferential direction are accommodated in the same 16th slot.

[0172] When k = 4, the symmetrical coils are: (i) unit coils U14 and U24; and (ii) a combination of unit coils U15 and U25. In this case, the first ends of unit coils U14 and U15 in the circumferential direction are accommodated in the same 35th slot. The first ends of unit coils U24 and U25 in the circumferential direction are accommodated in the same 11th slot.

[0173] FIG. 21A and FIG. 21B The arrangement of the unit coils shown forms a structure that helps to suppress the main resonance.

[0174] In addition, FIG. 20 In the construction, secondary resonance can be suppressed due to the structure described below. Here, the midpoint between the neutral point N of each of the series-connected coil groups G1 and G2 and the U-phase terminal T1 is taken as the midpoint. The four (n / 2 coils, where n is an even number) unit coils (U11 to U14 and U12 to U24) from the U-phase terminal T1 to the midpoint constitute the first half-coil group, and the four (n / 2 coils) unit coils (U15 to U18 and U25 to U28) from the neutral point N to the midpoint constitute the second half-coil group.

[0175] Furthermore, in the first half-coil group, when the m-th unit coil counted in connection sequence starting from the U-phase terminal T1 and the m-th unit coil counted in connection sequence starting from the midpoint are considered first symmetrical coils, this configuration ensures that at least each of the first ends of the first symmetrical coils existing from the U-phase terminal T1 to the midpoint in the circumferential direction are accommodated in slots of the same phase within the same magnetic pole. Furthermore, in the second half-coil group, when the m-th unit coil counted in connection sequence starting from the neutral point N and the m-th unit coil counted in connection sequence starting from the midpoint are considered second symmetrical coils, this configuration ensures that at least each of the first ends of the second symmetrical coils existing from the neutral point N to the midpoint in the circumferential direction are accommodated in slots of the same phase within the same magnetic pole.

[0176] Reference FIG. 21A and FIG. 21B To describe the specific construction of the aforementioned structure.

[0177] In the first half-coil group, when m = 1, the first symmetrical coils are: (i) unit coils U11 and U21; and (ii) a combination of unit coils U14 and U24. In this case, the first ends of unit coils U11 and U24 in the circumferential direction are accommodated in adjacent 4th and 5th slots. The first ends of unit coils U21 and U14 in the circumferential direction are accommodated in adjacent 28th and 29th slots. Here, the adjacent 4th and 5th slots and the adjacent 28th and 29th slots correspond to slots of the same phase within the same magnetic pole.

[0178] In the first half-coil group, when m = 2, the first symmetrical coils are: (i) unit coils U12 and U22; and (ii) a combination of unit coils U13 and U23. In this case, the first ends of unit coils U12 and U13 in the circumferential direction are accommodated in adjacent slots 40 and 41. The first ends of unit coils U22 and U23 in the circumferential direction are accommodated in adjacent slots 16 and 17.

[0179] Furthermore, in the second half-coil group, when m = 1, the second symmetrical coils are: (i) unit coils U15 and U25; and (ii) a combination of unit coils U18 and U28. In this case, the first ends of unit coils U15 and U28 in the circumferential direction are accommodated in adjacent slots 34 and 35. The first ends of unit coils U25 and U18 in the circumferential direction are accommodated in adjacent slots 10 and 11.

[0180] In the second half-coil group, when m = 2, the second symmetrical coils are: (i) unit coils U16 and U26; and (ii) a combination of unit coils U17 and U27. In this case, the first ends of unit coils U16 and U17 in the circumferential direction are accommodated in adjacent slots 46 and 47. The first ends of unit coils U26 and U27 in the circumferential direction are accommodated in adjacent slots 22 and 23.

[0181] Here, for example, the first ends of the unit coils U11 and U24 in the circumferential direction of different first series-connected coil groups G1 and second series-connected coil groups G2 are accommodated in adjacent fourth and fifth slots. The first ends of the unit coils U21 and U14 in the circumferential direction of different first series-connected coil groups G1 and second series-connected coil groups G2 are accommodated in adjacent 28th and 29th slots. In this case, for two unit coils accommodated in slots of the same phase within the same magnetic pole, when the unit coil of the first series-connected coil group is the i-th and the unit coil of the second series-connected coil group is the j-th, i ≠ j.

[0182] Furthermore, when the number of the series-connected coils in each of the first series-connected coil group G1 and the second series-connected coil group G2 is n, n / 4 < i ≤ 3n / 4 holds in the i-th unit coil, and j ≤ n / 4 holds in the j-th unit coil. That is, according to this embodiment, n = 8. In each of the adjacent 4th and 5th slots and the adjacent 28th and 29th slots, the first unit coil (the unit coil satisfying j ≤ n / 4) and the fourth unit coil (the unit coil satisfying n / 4 < i ≤ 3n / 4) are accommodated as unit coils of different first series-connected coil groups G1 and second series-connected coil groups G2.

[0183] Furthermore, the first ends of the unit coils U15 and U28 of the different first series-connected coil groups G1 and G2, respectively, in the circumferential direction are accommodated in adjacent slots 34 and 35. The first ends of the unit coils U18 and U25 of the different first series-connected coil groups G1 and G2, respectively, in the circumferential direction are accommodated in adjacent slots 10 and 11. In this case, i ≠ j. Furthermore, in the i-th unit coil, n / 4 < i ≤ 3n / 4, and in the j-th unit coil, j > 3n / 4. That is, in each of the adjacent 34th and 35th slots and the adjacent 10th and 11th slots, the eighth unit coil (i.e., the unit coil that satisfies j > 3n / 4) and the fifth unit coil (the unit coil that satisfies n / 4 < i ≤ 3n / 4) are accommodated as unit coils of different first series-connected coil group G1 and second series-connected coil group G2.

[0184] Similarly, in the combination of unit coils housed in adjacent 16th and 17th slots (i.e., (i) the combination of unit coils U12 and U22; and (ii) the combination of unit coils U13 and U23), and in the combination of unit coils housed in adjacent 22nd and 23rd slots (i.e., (i) the combination of unit coils U16 and U26; and (ii) the combination of unit coils U17 and U27), when the unit coil of the first series-connected coil group is the i-th and the unit coil of the second series-connected coil group is the j-th, n / 4 < i ≤ 3n / 4 and j ≤ n / 4 or j > 3n / 4 are true.

[0185] Due to the arrangement of the unit coils as described above, such as FIG. 22 As shown, mutual magnetic coupling can occur between coils housed in the same or adjacent slots (i.e., slots of the same phase within the same magnetic pole). This can reduce the surge voltage generated by the primary and secondary resonance phenomena. Specifically, the surge voltage generated by the primary resonance is symmetrical between the phase terminal side and the neutral point N side, and their polarities are opposite. However, due to the magnetic coupling between the phase terminal side and the neutral point N side, based on the principle of a transformer, the surge voltage is transmitted between the phase terminal side and the neutral point N side through electromagnetic induction. As a result, the surge voltage generated by the primary resonance is reduced. Furthermore, magnetic coupling also occurs between the phase terminal side and the neutral point N side in the first and second half-coil groups of the series-connected coil groups G1 and G2. Therefore, the surge voltage generated by the secondary resonance is reduced.

[0186] exist FIG. 23A In the diagram, dashed arrows represent the induced voltage Vd generated due to magnetic coupling between the phase terminal side and the midpoint side, and the induced voltage Vd generated due to magnetic coupling between the neutral point N side and the midpoint side. The induced voltage Vd is generated between the unit coils in symmetrical positions in the first half-coil group (i.e., the unit coils constituting the first symmetrical coil) and the unit coils in symmetrical positions in the second half-coil group (i.e., the unit coils constituting the second symmetrical coil).

[0187] The result is, as FIG. 23B As shown, a voltage in the opposite direction to the surge voltage Vs generated in the unit coil is induced. This achieves the effect of suppressing the surge voltage generated between the coils. Furthermore, as... FIG. 23C As shown, the resonant voltage is reduced. Therefore, as FIG. 24 As shown, according to this embodiment represented by solid lines, compared with the prior art represented by dashed lines, the influence of surge voltage is suppressed and the voltage difference (sharing voltage) between coils is reduced.

[0188] exist FIG. 20In the illustrated configuration, the series-connected coil groups G1 and G2 of the U-phase coil 32 include a unit coil wound on a first side in the circumferential direction and a unit coil wound on a second side in the circumferential direction. The i-th coil, counted from the U-phase terminal T1, is arranged at a folded-back position in the winding direction. Furthermore, in the series-connected coil groups G1 and G2, the first end of the i-th unit coil in the circumferential direction, and the respective first ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction, are accommodated in slots of the same phase within the same magnetic pole. Additionally, the respective first and second ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction are also accommodated in slots of the same phase within the same magnetic pole.

[0189] Specifically, such as FIG. 21A As shown, the series-connected coil group G1 includes unit coils U11 to U14 wound on a first side in the circumferential direction, and unit coils U15 to U18 wound on a second side in the circumferential direction. The fourth unit coil U14, counting from the U-phase terminal T1, is arranged at a folded-back position in the winding direction. Additionally, as... FIG. 21B As shown, the series-connected coil group G2 includes unit coils U21 to U24 wound on a first side in the circumferential direction, and unit coils U25 to U28 wound on a second side in the circumferential direction. The fourth unit coil U24, counting from the U-phase terminal T1, is arranged at a folded-back position in the winding direction (circumferential direction).

[0190] Furthermore, on the first end side (left end side in the figure) in the circumferential direction of unit coil 14, the first end of unit coil U14 and the first ends of unit coils U13 and U15, which are the third and fifth unit coils, are accommodated in slots of the same phase within the same magnetic pole. In addition, the first and second ends of unit coils U13 and U15 in the circumferential direction are also accommodated in slots of the same phase within the same magnetic pole.

[0191] Similarly, on the first end side (left end side in the figure) in the circumferential direction of unit coil 24, the first end of unit coil U24 and the first ends of unit coils U23 and U25, which are the third and fifth unit coils, are accommodated in slots of the same phase within the same magnetic pole. Furthermore, the first and second ends of unit coils U23 and U25 in the circumferential direction are also accommodated in slots of the same phase within the same magnetic pole.

[0192] In the rotary motor 10, in addition to the U-phase coil 32U, similar devices can also be used for the V-phase coil 32V and the W-phase coil 32W. FIG. 20 ,FIG. 21A and FIG. 21B The winding structure in the circuit. As a result, primary and secondary resonances are appropriately suppressed in the phase coils of each phase.

[0193] ( FIG. 20 (Examples of variations in the structure)

[0194] FIG. 25 The construction in can be considered as a modification FIG. 20 A variation of a part of the structure. Similar to... FIG. 20 The way it is constructed, in FIG. 25 In the configuration, in the first series-connected coil group G1, unit coils U11 to U14 are arranged to be wound clockwise. Additionally, the remaining unit coils U15 to U18 are arranged to be wound counterclockwise. Furthermore, in the second series-connected coil group G2, unit coils U21 to U24 are arranged to be wound clockwise. Additionally, the remaining unit coils U25 to U28 are arranged to be wound counterclockwise.

[0195] exist FIG. 25 In the construction, the bridging portions are arranged as follows: When viewed from the U-phase terminal T1, in the series-connected coil group G1, the bridging direction of bridging portions A11 to A14 is clockwise. The bridging direction of bridging portions A15 to A17 is counterclockwise. In this case, bridging portion A15 is a reverse bridging portion whose bridging direction is opposite to that of the previous bridging portion A14. Furthermore, in the series-connected coil group G2, the bridging direction of bridging portions A21 to A24 is clockwise. The bridging direction of bridging portions A25 to A27 is counterclockwise. In this case, bridging portion A25 is a reverse bridging portion whose bridging direction is opposite to that of the previous bridging portion A24.

[0196] exist FIG. 25 In the construction, with FIG. 20 Compared to the previous configuration, the bridging portions A14 and A24, located at the middle position, are respectively configured to bridge between a position located on the outer side in the radial direction and a position located on the inner side in the radial direction. Furthermore, the bridging portion used as the reverse bridging portion is different.

[0197] The slot spacing of unit coils U11 to U18 and unit coils U21 to U28 are both six slots, which is equivalent to the slot spacing of a single magnetic pole. Furthermore, in bridging portions A11 to A17 and A21 to A27, the bridging portions A11, A13, ..., A21, A23, etc., arranged radially on the inner side have five slots. The bridging portions A12, A15, ..., A22, A25, etc., arranged radially on the outer side, and the bridging portions A14 and A24, which bridge the inner and outer sides radially, have seven slots.

[0198] Reference FIG. 26A and FIG. 26B This describes the slot location for the unit coil. FIG. 26A This is a diagram showing the slot locations of the unit coils in the series-connected coil group G1. FIG. 26B This is a diagram showing the slot locations of the unit coils in the series-connected coil group G2.

[0199] like FIG. 26A and FIG. 26B As shown, in the U-phase coil 32U, when the k-th unit coil counted in the connection sequence starting from the U-phase terminal T1 and the k-th unit coil counted in the connection sequence starting from the neutral point N are considered as symmetrical coils, the configuration is such that the respective first ends and second ends of the symmetrical coils from the U-phase terminal T1 to the neutral point N in the circumferential direction are accommodated in the same phase slot within the same magnetic pole.

[0200] Specifically, when k=1, the symmetrical coils are: (i) unit coils U11 and U21; and (ii) a combination of unit coils U18 and U28. In this case, the first and second ends of unit coils U11 and U18 in the circumferential direction are each accommodated in adjacent slots 4 and 5, and adjacent slots 47 and 48. Furthermore, the first and second ends of unit coils U21 and U28 in the circumferential direction are each accommodated in adjacent slots 28 and 29, and adjacent slots 22 and 23.

[0201] When k = 2, the symmetrical coils are: (i) a combination of unit coils U12 and U22; and (ii) a combination of unit coils U17 and U27. In this case, the first and second ends of unit coils U12 and U17 in the circumferential direction are each accommodated in adjacent slots 46 and 47, and adjacent slots 40 and 41. Similarly, the first and second ends of unit coils U22 and U27 in the circumferential direction are each accommodated in adjacent slots 22 and 23, and adjacent slots 16 and 17.

[0202] When k = 3, the symmetrical coils are: (ii) a combination of unit coils U13 and U23; and (ii) a combination of unit coils U16 and U26. In this case, the first and second ends of unit coils U13 and U16 in the circumferential direction are each accommodated in adjacent slots 40 and 41, and adjacent slots 34 and 35. Similarly, the first and second ends of unit coils U23 and U26 in the circumferential direction are each accommodated in adjacent slots 16 and 17, and adjacent slots 10 and 11.

[0203] When k = 4, the symmetrical coils are: (i) unit coils U14 and U24; and (ii) a combination of unit coils U15 and U25. In this case, the first and second ends of unit coils U14 and U15 in the circumferential direction are each accommodated in adjacent slots 34 and 35, and adjacent slots 28 and 29. Similarly, the first and second ends of unit coils U24 and U25 in the circumferential direction are each accommodated in adjacent slots 10 and 11, and adjacent slots 4 and 5.

[0204] FIG. 26A The arrangement of the unit coils shown in Figure 26B forms a structure that helps suppress the main resonance.

[0205] In addition, FIG. 25 In the construction, in the first half-coil group of each of the series-connected coil groups G1 and G2, when the m-th unit coil counted in the connection sequence starting from the U-phase terminal T1 and the m-th unit coil counted in the connection sequence starting from the midpoint are considered as first symmetrical coils, this construction ensures that at least each of the first ends of the first symmetrical coils existing from the U-phase terminal T1 to the midpoint in the circumferential direction are accommodated in slots of the same phase within the same magnetic pole. Furthermore, in the second half-coil group, when the m-th unit coil counted in the connection sequence starting from the neutral point N and the m-th unit coil counted in the connection sequence starting from the midpoint are considered as second symmetrical coils, this construction ensures that at least each of the first ends of the second symmetrical coils existing from the neutral point N to the midpoint in the circumferential direction are accommodated in slots of the same phase within the same magnetic pole.

[0206] Reference FIG. 26A and FIG. 26B Describe the specific construction of the aforementioned structure.

[0207] In the first half-coil group, when m = 1, the first symmetrical coils are: (i) unit coils U11 and U21; and (ii) a combination of unit coils U14 and U24. In this case, the first ends of unit coils U11 and U24 in the circumferential direction are accommodated in adjacent 4th and 5th slots. The first ends of unit coils U21 and U14 in the circumferential direction are accommodated in adjacent 28th and 29th slots.

[0208] In the first half-coil group, when m = 2, the first symmetrical coils are: (i) unit coils U12 and U22; and (ii) a combination of unit coils U13 and U23. In this case, the first ends of unit coils U12 and U13 in the circumferential direction are accommodated in adjacent slots 40 and 41. The first ends of unit coils U22 and U23 in the circumferential direction are accommodated in adjacent slots 16 and 17.

[0209] Furthermore, in the second half-coil group, when m = 1, the second symmetrical coils are: (i) unit coils U15 and U25; and (ii) a combination of unit coils U18 and U28. In this case, the first ends of unit coils U15 and U28 in the circumferential direction are accommodated in adjacent slots 28 and 29. The first ends of unit coils U25 and U18 in the circumferential direction are accommodated in adjacent slots 4 and 5.

[0210] In the second half-coil group, when m = 2, the second symmetrical coils are: (i) unit coils U16 and U26; and (ii) a combination of unit coils U17 and U27. In this case, the first ends of unit coils U16 and U17 in the circumferential direction are accommodated in adjacent slots 40 and 41. The first ends of unit coils U26 and U27 in the circumferential direction are accommodated in adjacent slots 16 and 17.

[0211] exist FIG. 25 The same applies to its construction, similar to... FIG. 20 In the configuration, at least each of the first ends of the i-th unit coil in the first series-connected coil group G1 and the j-th unit coil in the second series-connected coil group G2 are housed in slots of the same phase within the same magnetic pole, and i ≠ j. Furthermore, the i-th unit coil includes unit coils for which n / 4 < i ≤ 3n / 4. The j-th unit coil includes unit coils for which at least one of j ≤ n / 4 and j > 3n / 4 is met.

[0212] By arranging the unit coils as described above, mutual magnetic coupling can occur between coils in the same phase and within the same magnetic pole. This can reduce surge voltages generated during primary and secondary resonance phenomena.

[0213] exist FIG. 25 In the illustrated configuration, the first series-connected coil group G1 and the second series-connected coil group G2 of the U-phase coil 32 include a unit coil wound on a first side in the circumferential direction and a unit coil wound on a second side in the circumferential direction. The i-th coil, counted from the U-phase terminal T1, is arranged at a folded-back position in the winding direction. Furthermore, in the first series-connected coil group G1 and the second series-connected coil group G2, the first end of the i-th unit coil in the circumferential direction, and the respective first ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction are accommodated in slots of the same phase within the same magnetic pole. Additionally, the respective first and second ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction are also accommodated in slots of the same phase within the same magnetic pole.

[0214] Specifically, such as FIG. 26A As shown, the fifth unit coil U15, counting from the U-phase terminal T1, is positioned at the foldback position in the circumferential direction of the first series-connected coil group G1. Additionally, as... FIG. 26B As shown, the fifth unit coil U25, counting from the U-phase terminal T1, is arranged at the foldback position in the circumferential direction of the second series-connected coil group G2.

[0215] Furthermore, on the first end side (left end side in the figure) in the circumferential direction of unit coil 15, the first end of unit coil U15 and the first ends of unit coils U14 and U16, which are the fourth and sixth unit coils, are accommodated in slots of the same phase within the same magnetic pole. In addition, the first and second ends of unit coils U14 and U16 in the circumferential direction are also accommodated in slots of the same phase within the same magnetic pole.

[0216] Similarly, on the first end side (left end side in the figure) in the circumferential direction of unit coil 25, the first end of unit coil U25 and the first ends of unit coils U24 and U26, which are the fourth and sixth unit coils, are accommodated in slots of the same phase within the same magnetic pole. Furthermore, the first and second ends of unit coils U24 and U26 in the circumferential direction are also accommodated in slots of the same phase within the same magnetic pole.

[0217] In the rotary motor 10, in addition to the U-phase coil 32U, similar devices can also be used for the V-phase coil 32V and the W-phase coil 32W. FIG. 25 , FIG. 26A and FIG. 26B The winding structure in the circuit. As a result, primary and secondary resonances are appropriately suppressed in the phase coils of each phase.

[0218] exist FIG. 25 In the construction, bridging portions A14 and A24 are respectively configured to bridge between a position located on the outer side in the radial direction and a position located on the inner side in the radial direction. Bridging portions A14 and A24 are respectively configured to cross over the coil end of the unit coil. That is, in the structure of the series-connected coil group with the winding direction reversed, the bridging portions bridge not only in the circumferential direction but also in the radial direction.

[0219] Regarding this point, FIG. 20 In its construction, the bridging portion does not need to be bridging in the radial direction. This construction helps to suppress the complexity of the structure and the increase in size along the axial length direction. That is, in FIG. 20 In its construction, the folding positions are offset by an amount equivalent to that of a single coil. When a series-connected coil group is folded back, the bridging portions will connect to each other either at their outermost points in the radial direction or at their innermost points in the radial direction.

[0220] Based on the above detailed description of this embodiment, the following excellent effects can be obtained.

[0221] In the rotary electric machine 10 constructed as described above, each of the phase coils 32U, 32V, and 32W of the stator winding 32 has multiple series-connected coil groups G1 and G2, each of which consists of n unit coils. In each series-connected coil group G1 and G2, a first end is connected to the phase terminal of each phase, and a second end is connected to the neutral point N. In this state, the series-connected coil groups G1 and G2 are connected in parallel with each other. In this case, this configuration is advantageous for achieving higher output in the rotary electric machine 10.

[0222] Furthermore, each phase coil 32U, 32V, 32W is configured such that at least the first end of the i-th unit coil in the circumferential direction, counted in the connection sequence starting from the phase terminals, and the respective first ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction are housed in slots of the same phase within the same magnetic pole. Additionally, the respective first and second ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction are also housed in slots of the same phase within the same magnetic pole. In this configuration, resonance phenomena can be suppressed due to the magnetic coupling between the (i-1)-th and (i+1)-th unit coils.

[0223] That is, since the voltage at one unit coil in the same phase slot within the same magnetic pole is transferred to the voltage at another unit coil, the resonant voltage can be eliminated. As a result, the increase in voltage difference (sharing voltage) between unit coils can be suppressed. Furthermore, the insulation performance can be appropriately improved. In addition, in the rotating electric machine 10, a more compact and higher density stator winding 32 and improved insulation performance can be achieved.

[0224] In each of the first series-connected coil group G1 and the second series-connected coil group G2, the winding direction of the unit coil is reversed by the i-th unit coil counted from the phase terminal. Furthermore, this configuration ensures that the i-th, (i-1), and (i+1)-th unit coils, as referenced to the reversed position, are housed in slots of the same phase within the same magnetic pole. As a result, it is possible to suitably obtain a configuration where the (i±1)-th unit coil is housed in a slot of the same phase within the same magnetic pole.

[0225] The first series-connected coil group G1 and the second series-connected coil group G2 are respectively arranged within a circumferential region smaller than that of a single turn surrounding the stator core 31. The first series-connected coil group G1 and the second series-connected coil group G2, which are different from each other, are arranged in a circumferential direction. As a result, the unit coils on the phase terminal side and the unit coils on the neutral point N side can be accommodated in slots of the same phase within the same magnetic pole between the first series-connected coil group G1 and the second series-connected coil group G2. Therefore, due to the magnetic coupling between the first series-connected coil group G1 and the second series-connected coil group G2, the resonant voltage between the different first series-connected coil group G1 and the second series-connected coil group G2 can be reduced.

[0226] In a first series-connected coil group G1 and a second series-connected coil group G2, at least each of the first ends of the i-th unit coil in the circumferential direction of one of the series-connected coil groups G1 and G2, and the j-th unit coil in the other series-connected group, are housed in slots of the same phase within the same magnetic pole, where i ≠ j. In this case, by combining the unit coils housed in slots of the same phase within the same magnetic pole, a structure for suppressing resonance phenomena can be readily obtained. Furthermore, a suitable structure for suppressing secondary resonances other than the primary resonance can be obtained.

[0227] The i-th unit coil includes a unit coil for which n / 4 < i ≤ 3n / 4. The j-th unit coil includes a unit coil for which at least one of j ≤ n / 4 and j > 3n / 4 is true. In this case, the combination of unit coils housed in the same phase slot within the same magnetic pole is a combination of a unit coil near the phase terminal or neutral point N and a unit coil near the midpoint from the phase terminal to the neutral point. A structure with high suppression effect on secondary resonance can be obtained.

[0228] In phase coils 32U, 32V, and 32W, when the kth unit coil counted in the connection sequence starting from phase terminal T1 (U) and the kth unit coil counted in the connection sequence starting from neutral point N are considered symmetrical coils, the above configuration ensures that at least each of the first ends of the symmetrical coils existing from the phase terminal to neutral point N in the circumferential direction are accommodated in slots of the same phase within the same magnetic pole. Therefore, due to the magnetic coupling between the unit coils on the phase terminal side and the unit coils on the neutral point N side constituting the symmetrical coils, resonance phenomena can be suppressed. That is, since the voltage at one unit coil in the slot of the same phase within the same magnetic pole is transferred to the voltage at another unit coil, the resonant voltage can be eliminated.

[0229] In the first series-connected coil group G1 and the second series-connected coil group G2 of each of the phase coils 32U, 32V, and 32W, a first symmetrical coil and a second symmetrical coil that are magnetically coupled to each other are defined in the n / 2 unit coils from the phase terminal to the midpoint and in the n / 2 unit coils from the neutral point N to the midpoint, and secondary resonance is suppressed due to their magnetic coupling. As a result, the increase in the voltage difference (sharing voltage) between the unit coils attributable to secondary resonance can be suppressed.

[0230] The unit coils are arranged such that the wires wound by overlapping windings are arranged in multiple layers radially within slot 35. Unit coils adjacent to each other in the circumferential direction are connected by bridging portions at their innermost or outermost points in the radial direction. In this case, unit coils of the same phase are housed in a configuration where two slots 35 are provided for each phase of each magnetic pole, and the bridging portions are provided at least one of a slot spacing of y or (y±1) slot spacings. As a result, a configuration suitable for reversing the extension direction (winding orientation in the circumferential direction) at the bridging portions is obtained. Furthermore, the length of the bridging portions can be made as short as possible.

[0231] (Second Implementation)

[0232] The second embodiment differs from the first embodiment in that each of the phase coils 32U, 32V, and 32W has a four-in-parallel connection. The coil connection diagram is shown in... FIG. 27 As shown in the image.

[0233] like FIG. 27 As shown, the U-phase coil 32U has a first series-connected coil group G1, a second series-connected coil group G2, a third series-connected coil group G3, and a fourth series-connected coil group G4 connected in parallel. The first series-connected coil group G1 consists of four unit coils U11, U12, U13, and U14. The second series-connected coil group G2 consists of four unit coils U21, U22, U23, and U24. The third series-connected coil group G3 consists of four unit coils U31, U32, U33, and U34. The fourth series-connected coil group G4 consists of four unit coils U41, U42, U43, and U44. The V-phase coil 32V and W-phase coil 32W are similarly constructed. Here, in each of the phase coils 32U, 32V, and 32W, the number of series-connected coils in each of the first series-connected coil group G1 to the fourth series-connected coil group G4 does not need to be four, but can, for example, be eight.

[0234] exist FIG. 28 In the construction, such as FIG. 28 As shown in the left figure, the unit coils U11 to U14 of the first series connection group G1 and the unit coils U21 to U24 of the second series connection group G2 are respectively arranged to be wound in a clockwise direction. Additionally, as... FIG. 28 As shown in the right figure, the unit coils U31 to U34 of the third series connection group G3 and the unit coils U41 to U44 of the fourth series connection group G4 are arranged to be wound in a counterclockwise direction.

[0235] exist FIG. 28 In its construction, the bridging portions are arranged as follows: When viewed from the U-phase terminal T1, the extending directions of the bridging portions A11 to A13 of the first series-connected coil group G1 and the bridging portions A21 to A23 of the second series-connected coil group G2 are both clockwise. Furthermore, the extending directions of the bridging portions A31 to A33 of the third series-connected coil group G3 and the bridging portions A41 to A43 of the fourth series-connected coil group G4 are both counterclockwise.

[0236] The slot spacing of the unit coils in the first series-connected coil group G1 to the fourth series-connected coil group G4 is all six slots, which is equivalent to the slot spacing of a single magnetic pole. Furthermore, in the bridging portions of the first series-connected coil group G1 to the fourth series-connected coil group G4, the bridging portions A11, A13, ..., A21, A23, etc., arranged radially on the inner side have five slots, while the bridging portions A12, A22, etc., arranged radially on the outer side have seven slots.

[0237] Reference FIG. 29 This describes the slot location for the unit coil. FIG. 29 The slot receiving positions of the unit coils are shown within the slot region of unit coils U11 to U14, which at least include a first series-connected coil group G1. Here, in FIG. 29 In the middle, from the top, the unit coils of the first series-connected coil group G1 to the fourth series-connected coil group G4 are shown in two rows respectively.

[0238] like FIG. 29 As shown, in the U-phase coil 32U, when the kth unit coil counted in the connection sequence starting from the U-phase terminal T1 and the kth unit coil counted in the connection sequence starting from the neutral point N are considered symmetrical coils, the configuration is such that at least each of the first ends of the symmetrical coils from the U-phase terminal T1 to the neutral point N in the circumferential direction are accommodated in the same phase slot within the same magnetic pole.

[0239] Specifically, for example, for the unit coil U11 of the first series-connected coil group G1, the first end of the unit coil U11 in the circumferential direction and the first end of the unit coil U24 of the second series-connected coil group G2 in the circumferential direction are accommodated in adjacent fourth and fifth slots. The second end of the unit coil U11 in the circumferential direction and the first end of the unit coil U44 in the circumferential direction of the fourth series-connected coil group G4 are accommodated in the same 48th slot. Furthermore, for the unit coil U14 of the first series-connected coil group G1, the first end of the unit coil U14 in the circumferential direction, the first end of the unit coil U21 of the second series-connected coil group G2, and the first end of the unit coil U41 of the fourth series-connected coil group G4 are accommodated in the same and adjacent 28th and 29th slots. As a result, the main resonance can be suppressed.

[0240] In addition, FIG. 29 In the construction, in the first half-coil group of each of the first series-connected coil groups G1 to the fourth series-connected coil groups G4, when the m-th unit coil counted in the connection sequence starting from the U-phase terminal T1 and the m-th unit coil counted in the connection sequence starting from the midpoint are considered as first symmetrical coils (such as unit coils U11, U12), the construction is such that at least each of the first ends of the first symmetrical coils existing from the U-phase terminal T1 to the midpoint in the circumferential direction are accommodated in the same phase slot within the same magnetic pole.

[0241] Furthermore, in the second half-coil group, when the m-th unit coil, counted in connection order starting from neutral point N, and the m-th unit coil, counted in connection order starting from the midpoint, are considered second symmetrical coils (such as unit coils U13 and U14), this configuration ensures that at least each of the first ends of the second symmetrical coils existing from neutral point N to the midpoint are housed in slots of the same phase within the same magnetic pole. As a result, secondary resonance can be suppressed.

[0242] Furthermore, in the U-phase coil 32U, the first end of the i-th unit coil in the circumferential direction, counting from the U-phase terminal T1, and the first ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction are housed in slots of the same phase within the same magnetic pole. Additionally, the first and second ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction are also housed in slots of the same phase within the same magnetic pole.

[0243] Specifically, for example, on the first end side (left end side in the figure) of unit coil U13, which is the third unit coil counting from phase terminal T1, in the circumferential direction, the first end of unit coil U13 and the respective first ends in the circumferential direction of unit coils U12 and U44, which are the second and fourth unit coils, are accommodated in adjacent slots 40 and 41. Additionally, the respective first ends and second ends in the circumferential direction of unit coils U12 and U44 are accommodated in adjacent slots.

[0244] Similarly, on the second end side (right end side in the figure) of the unit coil U13 in the circumferential direction, the second end of the unit coil U13 and the respective first ends of the unit coils U14 and U42, which are the second and fourth unit coils, are accommodated in adjacent slots 28 and 29. Furthermore, the respective first ends and second ends of the unit coils U14 and U42 in the circumferential direction are accommodated in adjacent slots.

[0245] In the rotary motor 10, in addition to the U-phase coil 32U, similar devices can also be used for the V-phase coil 32V and the W-phase coil 32W. FIG. 28 and FIG. 29 The winding structure in the circuit. As a result, primary and secondary resonances are appropriately suppressed in the phase coils of each phase.

[0246] (According to the first variation of the second embodiment)

[0247] As modified FIG. 28 A variation of a part of the structure can be considered. FIG. 30 The structure within. In FIG. 30In the construction, in the first series-connected coil group G1 to the fourth series-connected coil group G4, the first half of the unit coil, which is counted in connection order starting from the phase terminal, is arranged to be wound in a clockwise direction, and the second half of the unit coil is arranged to be wound in a counterclockwise direction.

[0248] exist FIG. 30 In the construction, the bridging portions are arranged as follows: When viewed from the U-phase terminal T1, in the first series-connected coil group G1, the extending direction of bridging portions A11 and A12 is clockwise. The extending direction of bridging portion A13 is counterclockwise. In this case, bridging portion A13 is a reverse bridging portion whose bridging direction is opposite to that of the previous bridging portion A12. This construction also applies to the second series-connected coil groups G2 to the fourth series-connected coil group G4. Furthermore, in the series-connected coil groups G1 to G4, the bridging portions A12 and A22, located at the middle positions, are respectively configured to bridge between a radially outer position and a radially inner position.

[0249] The slot spacing of the unit coils in the first series-connected coil group G1 to the fourth series-connected coil group G4 is all six slots, which is equivalent to the slot spacing of a single magnetic pole. Furthermore, in the bridging portions of the first series-connected coil group G1 to the fourth series-connected coil group G4, the bridging portions A11, A21, ... arranged radially on the inner side have five slots. The other bridging portions A12, A13, A22, A23, ... have seven slots.

[0250] Here, we will refer to FIG. 31 This describes the slot location for the unit coil. FIG. 31 The slot accommodating position of the unit coil is shown in the slot region of the unit coils U11 to U14, which includes at least the first series-connected coil group G1.

[0251] In a manner similar to that described above, FIG. 31 Similarly, in the U-phase coil 32U, when the k-th unit coil, counted in the connection sequence starting from the U-phase terminal T1, and the k-th unit coil, counted in the connection sequence starting from the neutral point N, are considered symmetrical coils, this configuration ensures that at least each of the first ends of the symmetrical coils from the U-phase terminal T1 to the neutral point N in the circumferential direction are accommodated in slots of the same phase within the same magnetic pole. Furthermore, in the first and second half-coils of each of the series-connected coil groups G1 to G4, the symmetrical unit coils are accommodated in slots of the same phase within the same magnetic pole.

[0252] Furthermore, in the U-phase coil 32U, the first end of the i-th unit coil in the circumferential direction, counting from the U-phase terminal T1, and the first ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction are housed in slots of the same phase within the same magnetic pole. Additionally, the first and second ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction are also housed in slots of the same phase within the same magnetic pole.

[0253] Specifically, for example, on the first end side (left end side in the figure) of unit coil U13, which is the third unit coil counting from phase terminal T1, the first end of unit coil U13 and the respective first ends of unit coils U12 and U14, which are the second and fourth unit coils, are accommodated in adjacent slots 46 and 47. Additionally, the respective first ends and second ends of unit coils U12 and U14 are accommodated in adjacent slots.

[0254] In the rotary motor 10, in addition to the U-phase coil 32U, similar devices can also be used for the V-phase coil 32V and the W-phase coil 32W. FIG. 30 and FIG. 31 The winding structure in the middle.

[0255] (A second variation of the second embodiment)

[0256] With similar FIG. 30 The way it is constructed, in FIG. 32 In the construction, in the first series-connected coil group G1 to the fourth series-connected coil group G4, the first half of the unit coil is arranged to be wound in a clockwise direction in the connection order starting from the phase terminal, and the second half of the unit coil is arranged to be wound in a counterclockwise direction.

[0257] exist FIG. 32 In the construction, the bridging portions are arranged as follows: When viewed from the U-phase terminal T1, in the first series-connected coil group G1, the bridging direction of bridging portion A11 is clockwise. The bridging directions of bridging portions A12 and A13 are counterclockwise. In this case, bridging portion A12 is a reverse bridging portion whose bridging direction is opposite to that of the previous bridging portion A11. This construction also applies to the second series-connected coil group G2 to the fourth series-connected coil group G4.

[0258] The slot spacing of the unit coils in the first series-connected coil group G1 to the fourth series-connected coil group G4 is all six slots, which is equivalent to the slot spacing of a single magnetic pole. Furthermore, in the bridging portions of the first series-connected coil group G1 to the fourth series-connected coil group G4, the bridging portions A11, A13, A21, A23, etc., arranged radially on the inner side have five slots. The other bridging portions A12, A22, etc., have seven slots.

[0259] Here, we will refer to FIG. 33 This describes the slot location for the unit coil. FIG. 33 The slot accommodating position of the unit coil is shown in the slot region of the unit coils U11 to U14, which includes at least the first series-connected coil group G1.

[0260] In a manner similar to that described above, FIG. 33 In the U-phase coil 32U, when the k-th unit coil, counted in the connection sequence starting from the U-phase terminal T1, and the k-th unit coil, counted in the connection sequence starting from the neutral point N, are considered symmetrical coils, this configuration ensures that at least each of the first ends of the symmetrical coils from the U-phase terminal T1 to the neutral point N in the circumferential direction are accommodated in slots of the same phase within the same magnetic pole. Furthermore, in the first half-coil and the second half-coil of each of the first series-connected coil groups G1 to the fourth series-connected coil groups G4, the symmetrical unit coils are accommodated in slots of the same phase within the same magnetic pole.

[0261] Furthermore, in the U-phase coil 32U, the first end of the i-th unit coil in the circumferential direction, counting from the U-phase terminal T1, and the first ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction are housed in slots of the same phase within the same magnetic pole. Additionally, the first and second ends of the (i-1)-th and (i+1)-th unit coils in the circumferential direction are also housed in slots of the same phase within the same magnetic pole.

[0262] Specifically, for example, on the first end side (left end side in the figure) of unit coil U12, which is the second unit coil counting from phase terminal T1, the first end of unit coil U12 and the respective first ends of unit coils U11 and U13, which are the first and third unit coils, in the circumferential direction are accommodated in adjacent slots 46 and 47. Furthermore, the respective first ends and second ends of unit coils U11 and U13 in the circumferential direction are accommodated in adjacent slots.

[0263] Furthermore, on the second end side (right end side in the figure) of unit coil U12 in the circumferential direction, the second end of unit coil U12 and the first ends of unit coils U21 and U23, which are the first and third unit coils, in the circumferential direction are accommodated in adjacent slots 40 and 41. Additionally, the first and second ends of unit coils U21 and U23 in the circumferential direction are accommodated in adjacent slots.

[0264] In the rotary motor 10, in addition to the U-phase coil 32U, similar devices can also be used for the V-phase coil 32V and the W-phase coil 32W. FIG. 32 and FIG. 33 The winding structure in the middle.

[0265] (Third Implementation)

[0266] The rotary motor 10 according to the embodiments described so far is configured to have eight magnetic poles, four pole pairs, and forty-eight slots. However, the rotary motor 10 can be configured in other ways. According to this embodiment, the rotary motor 10 is configured to have twelve magnetic poles, six pole pairs, and seventy-two slots. Here, apart from having a different number of pole pairs and slots, the rotary motor 10 according to this embodiment has a configuration generally similar to that of the rotary motor 10 described so far according to the embodiments. The stator winding 32 has a segmented structure.

[0267] FIG. 34A and FIG. 34B A stator 30 with a 72-slot structure is shown. In the accompanying drawings, FIG. 34A This is a view of the stator winding 30 from the joint side, where the joint is the part of the conductor section 50 joined by welding or the like. FIG. 34B This is a view of the stator 30 from the bend 52 side of the conductor section 50.

[0268] In the stator 30, a winding terminal for each phase is provided in one of the coil ends 37, located at both ends in the axial direction, on the phase terminal side. FIG. 34A and FIG. 34B In the configuration, each of the phase coils 32U, 32V, and 32W for each phase has a four-in-parallel connection. Four winding terminals are provided for each phase. Furthermore, the winding terminals on the neutral point N side of each phase are connected by a neutral wire 38.

[0269] Here, each of the phase coils 32U, 32V, and 32W is connected in four parallel connections with... FIG. 27Similar to the previous configuration. However, the difference in the four-parallel connection of each of the phase coils 32U, 32V, and 32W is that, in the current configuration, for each series-connected coil group, six unit coils are connected in series. That is, for example, the U-phase coil 32U has a first series-connected coil group G1 to a fourth series-connected coil group G4 connected in four parallel connections. The first series-connected coil group G1 consists of six unit coils U11 to U16. Similarly, the second series-connected coil group G2 consists of six unit coils U21 to U26. The third series-connected coil group G3 consists of six unit coils U31 to U36. The fourth series-connected coil group G4 consists of six unit coils U41 to U46.

[0270] FIG. 35 This is a diagram showing the connection sequence of multiple unit coils in stator core 31 from a plan view. FIG. 35 Only the first series-connected coil group G1 (unit coils U11 to U16) of the U-phase coil 32U is shown. FIG. 35 In the diagram, a portion of numbers 1 through 72 are given as slot numbers. Additionally, in... FIG. 35 In the diagram, the connection sequence is indicated by arrows starting from the U-phase terminal. The bend 52 side of the conductor segment 50 is indicated by a solid line. The joint side of the conductor segment 50 is indicated by a dashed line.

[0271] exist FIG. 35 In the construction, in the first series-connected coil group G1, the unit coils U11 to U14 are arranged to be wound in a counterclockwise direction. In addition, the remaining two unit coils U15 and U16 are arranged to be wound in a clockwise direction.

[0272] Unit coils U11 to U16 are connected via bridging sections A11 to A15. Bridging sections A11 to A15 are constructed as follows: when viewed from the U-phase terminal, the bridging direction of bridging sections A11 to A13 is counterclockwise. The bridging directions of bridging sections A14 and A15 are clockwise. In this case, bridging section A14 is a reverse bridging section whose bridging direction is opposite to that of the previous bridging section A13. Although not shown, this construction also applies to other series-connected coil groups G2 to G4.

[0273] The slot spacing of unit coils U11 to U16 is all six slots, which is equivalent to the slot spacing of a single magnetic pole. Additionally, in bridging portions A11 to A15, bridging portions A11, A13, and A15, arranged radially on the inner side, have five slots. Bridging portions A14 and A16, located radially on the outer side, have seven slots.

[0274] In addition, FIG. 35In the configuration, in the first series-connected coil group G1, when the kth unit coil, counted in connection order starting from the U-phase terminal, and the kth unit coil, counted in connection order starting from the neutral point N, are considered symmetrical coils, this configuration ensures that at least each of the first ends of the symmetrical coils from the U-phase terminal T1 to the neutral point N in the circumferential direction are accommodated in slots of the same phase within the same magnetic pole. Specifically, for example, unit coils U11 and U16 are accommodated in the same 3rd slot. Unit coils U12 and U15 are accommodated in the same 70th slot. Unit coils U13 and U14 are accommodated in adjacent 63rd and 64th slots.

[0275] In the rotary motor 10, in addition to the U-phase coil 32U, similar devices can also be used for the V-phase coil 32V and the W-phase coil 32W. FIG. 35 The winding structure in the middle.

[0276] exist FIG. 35 In the above, bridging portions A11, A13, and A15 are provided at the innermost position with a radial spacing of five slots. Bridging portions A12 and A14 are provided at the outermost position with a radial spacing of seven slots. However, the configuration of bridging portions A11 to A15 (the slot spacing of the bridging portions) can be a configuration where the slot spacing located at the innermost position in the radial direction and the slot spacing located at the outermost position in the radial direction are opposite to the configuration described above. Here, in FIG. 35 In the diagram, the conductor segment 50 of the unit coil U11 connected to the U-phase terminal T1 is represented by A0.

[0277] According to this embodiment, bridging portions with different slot pitches are obtained by making the width dimensions of the bends 52 of the conductor segment 50 different in the circumferential direction. FIG. 36A to FIG. 36C The overall structure of conductor segment 50 is shown. In the accompanying drawings, FIG. 36A The conductor segment 50A with five slot pitches is shown. FIG. 36B The conductor segment 50B with six slot pitches is shown. FIG. 36C A conductor segment 50C with seven slot pitches is shown. FIG. 36A to FIG. 36C In each of the conductor segments 50A to 50C shown, the conductor length of the bend 52 is the same. However, due to the different shapes of the bends 52, the circumferential direction (i.e., FIG. 36A to FIG. 36CThe width dimensions La, Lb, and Lc in the lateral direction are different. Specifically, in conductor sections 50A to 50C, the rise angle of the bend 52 relative to the direction orthogonal to the axial direction (i.e., the rise angle along the axial direction relative to the end face of the stator core 31) is different. Each rise angle θa > θb > θc. As a result, conductor sections 50A to 50C with different width dimensions La, Lb, and Lc in the circumferential direction but the same conductor length for the bend 52 are formed. In this case, the coil end height can be reduced.

[0278] exist FIG. 35 In the configuration shown, conductor segments 50A with five slot pitches are used as innermost bridging portions A11, A13, and A15 in the radial direction. Furthermore, conductor segments 50B and 50C with six and seven slot pitches are used as outermost bridging portions A12 and A14 in the radial direction.

[0279] FIG. 37A and FIG. 37B This is an enlarged perspective view of the structure of coil end 37 (on the side of bend 52). In the attached drawing, FIG. 37A This is a diagram showing the end 37 of the coil viewed from the inside along the radial direction. FIG. 37B This is a diagram showing the end 37 of the coil viewed from the outside along the radial direction. (See diagram below.) FIG. 37A and FIG. 37B As shown, each conductor segment 50 is provided with a bend to prevent interference in the radial or axial direction. The bend is provided to prevent interference between conductor segments 50.

[0280] As described above, although the slot spacing on the bend 52 side of the conductor segment 50, which serves as a bridging portion, is different, the slot spacing on the joint side of the conductor segment 50 is always six slots. Therefore, joining operations, such as welding, can be facilitated, and productivity can be increased.

[0281] (Other implementation methods)

[0282] For example, the implementation described above can be modified in the following ways.

[0283] According to the embodiment described above, all phase coils 32U, 32V, and 32W have the following characteristic structure: at least a first end in the circumferential direction of the i-th unit coil and each first end in the circumferential direction of the (i-1)-th and (i+1)-th unit coils are housed in a slot of the same phase within the same magnetic pole. Furthermore, each first end and second end in the circumferential direction of the (i-1)-th and (i+1)-th unit coils are housed in a slot of the same phase within the same magnetic pole. This can be modified so that at least one phase coil has the characteristic structure described above. Additionally, at least one of the plurality of series-connected coil groups including each of the phase coils 32U, 32V, and 32W can have the characteristic structure described above.

[0284] The number of slots for each phase of each magnetic pole in stator 31 can be equal to or greater than 2, and for example, can be 4.

[0285] The rotary motor 10 can be a rotary motor with an external rotor structure. Furthermore, the rotary motor 10 can be used in applications other than as a vehicle motor. The rotary motor 10 can be a rotary motor widely used in moving bodies, or a rotary motor used in industrial or household electrical equipment.

Claims

1. A rotary electric machine comprising: a stator having a stator core and a stator winding, the stator core having a plurality of slots arranged along a circumferential direction, the stator winding having a plurality of phase coils wound in the slots; and a rotor arranged opposite to the stator along a radial direction and having a plurality of magnetic poles along a circumferential direction, wherein each of the phase coils has a plurality of series-connected coil groups, each of the series-connected coil groups including n unit coils arranged to be wound along the circumferential direction, a first end of each of the series-connected coil groups is connected to a phase terminal for a respective phase, a second end is connected to a neutral point, and the series-connected coil groups are connected in parallel, and in at least any one of the phase coils, at least a first end in the circumferential direction of an i-th unit coil counted in a connection order from the phase terminal, and each of first ends in the circumferential direction of an a+1-th unit coil and a β+1-th unit coil are accommodated in a slot of the same phase within the same magnetic pole, and each of the first end and a second end in the circumferential direction of the a+1-th unit coil and the β+1-th unit coil are accommodated in a slot of the same phase within the same magnetic pole, where i is a natural number of any one of 1 to n, a is a remainder of i divided by n, and β is a remainder of i-2 divided by n.

2. The rotary electric machine according to claim 1, wherein the series-connected coil group includes a unit coil wound on a first side in the circumferential direction from the phase terminal to the neutral point, and a unit coil wound on a second side in the circumferential direction, and the i-th unit coil is arranged at a turn-back position in the winding direction.

3. The rotary electric machine according to claim 1 or 2, wherein each of the series-connected coil groups is provided in a circumferential direction region smaller than a single turn around the stator core, and series-connected coil groups different from each other are arranged in line along the circumferential direction.

4. The rotary electric machine according to claim 1 or 2, wherein at least each of first ends in the circumferential direction of an i-th unit coil in one of the series-connected coil groups and a j-th unit coil in the other of the series-connected coil groups included in the phase coil of the same phase are accommodated in a slot of the same phase within the same magnetic pole, and i≠j.

5. The rotary electric machine according to claim 4, wherein in the i-th unit coil, n / 4 < i ≤ 3n / 4 holds, and in the j-th unit coil, at least one of j ≤ n / 4 and j > 3n / 4 holds.

6. The rotary electric machine according to claim 1 or 2, wherein in at least any one of the phase coils, when a k-th unit coil counted in a connection order from the phase terminal and a k-th unit coil counted in a connection order from the neutral point are considered to be a symmetric coil, at least each of first ends in the circumferential direction of the symmetric coil existing from the phase terminal to the neutral point is accommodated in a slot of the same phase within the same magnetic pole. ​ 7. The rotary electric machine according to claim 6, wherein in the series-connected coil group of at least any one phase, when an mth unit coil counted in a connection order from the phase terminal and an mth unit coil counted in a connection order from the neutral point are first symmetric coils in the n / 2 unit coils from the phase terminal to the neutral point, at least each first end of the first symmetric coils existing from the phase terminal to the neutral point is accommodated in a slot of the same phase within the same magnetic pole, and when an mth unit coil counted in a connection order from the neutral point and an mth unit coil counted in a connection order from the neutral point are second symmetric coils in the n / 2 unit coils from the neutral point to the neutral point, at least each first end of the second symmetric coils existing from the phase terminal to the neutral point is accommodated in a slot of the same phase within the same magnetic pole.

8. A rotary electric machine comprising: a stator having a stator core and a stator winding, the stator core having a plurality of slots arranged in a circumferential direction, the stator winding having a plurality of phase coils wound in the slots; and a rotor arranged opposite to the stator in a radial direction and having a plurality of magnetic poles in a circumferential direction, wherein each of the phase coils has a plurality of series-connected coil groups, each of the series-connected coil groups including n unit coils arranged to be wound in the circumferential direction, a first end of each of the series-connected coil groups is connected to a phase terminal for each phase, a second end is connected to a neutral point, and the series-connected coil groups are connected in parallel, each of the n unit coils is composed of a conductor wire wound by an overlap winding, and is arranged to be aligned in the circumferential direction in a connection order from the phase terminal, and in at least any one of the phase coils, when a kth unit coil counted in a connection order from the phase terminal and a kth unit coil counted in a connection order from the neutral point are considered to be symmetric coils, at least each first end of the symmetric coils existing from the phase terminal to the neutral point in the circumferential direction is accommodated in a slot of the same phase within the same magnetic pole, the series-connected coil group includes unit coils wound on a first side in the circumferential direction from the phase terminal to the neutral point and unit coils wound on a second side in the circumferential direction, each of the series-connected coil groups is provided in a circumferential direction region smaller than a single turn around the stator core, and series-connected coil groups different from each other are arranged to be aligned in the circumferential direction.

9. The rotary electric machine according to claim 8, wherein in the series-connected coil group of at least any one phase, ​ In the n / 2 unit coils from the phase terminal to the intermediate point, when an mth unit coil counted in the connection order from the phase terminal and an mth unit coil counted in the connection order from the intermediate point are the first symmetric coils, at least each first end of the first symmetric coils present from the phase terminal to the intermediate point is accommodated in the same phase slot within the same magnetic pole, and In the n / 2 unit coils from the neutral point to the intermediate point, when an mth unit coil counted in the connection order from the neutral point and an mth unit coil counted in the connection order from the intermediate point are the second symmetric coils, at least each first end of the second symmetric coils present from the phase terminal to the intermediate point is accommodated in the same phase slot within the same magnetic pole.

10. The rotary electric machine according to any one of claims 1, 2, and 8, characterized in that the number of slots of each phase for each magnetic pole in the stator core is 2x, where x is a natural number; the phase coil has a crossover connecting unit coils to each other in the series-connected coil group; the unit coils are arranged so that conductive wires wound by overlapping windings are arranged in a radial direction in the slots in multiple layers, and a slot pitch as an interval in a circumferential direction in which the unit coils are accommodated in the slots is y slot pitches corresponding to a slot pitch of a single magnetic pole; and the crossover is provided at least any one of y slot pitches, y-1 slot pitches, and y+1 slot pitches.

10. The rotary electric machine according to any one of claims 1, 2, and 8, characterized in that the number of slots of each phase for each magnetic pole in the stator core is 2x, where x is a natural number; the phase coil has a crossover connecting unit coils to each other in the series-connected coil group; the unit coils are arranged so that conductive wires wound by overlapping windings are arranged in a radial direction in the slots in multiple layers, and a slot pitch as an interval in a circumferential direction in which the unit coils are accommodated in the slots is y slot pitches corresponding to a slot pitch of a single magnetic pole; and the crossover is provided at least any one of y slot pitches, y-1 slot pitches, and y+1 slot pitches.

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