JP2015061476A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of rotary electric machine capable of dealing with high torque and high output of rotary electric machine by reducing the number of slots which require the insulation reliability.SOLUTION: The stator of rotary electric machine is a stator used in a rotary electric machine, which has a stator core with plural slots in which coils of plural phases are wound. Each of coils of the respective phases has plural unit coils to form magnetic poles. Unit coils at the power supply terminal side are disposed together with unit coils included in the coils of same phase in the slot. Unit coils at the neutral point side are disposed together with unit coils included in the coils of different phase in the slot.

Description

  Embodiments described herein relate generally to a stator of a rotating electrical machine.

  In recent years, rotating electric machines have been required to have higher torque and higher output, and accordingly, the voltage applied to the coil has been increased. As the applied voltage is increased, improvement in insulation reliability between coils in different phases is required. Such insulation reliability is improved by, for example, inserting insulating paper into a slot in which a coil having a different phase is disposed. However, with this technique, a space for inserting insulating paper is required, so that the size and cross-sectional area of the coil are limited, and the output efficiency of the rotating electrical machine is deteriorated. Thus, for example, Patent Document 1 discloses a technique for reducing the number of slots that require insulating paper by dispersing slots in which coils having different phases are arranged.

JP-A-9-121491

  However, even with such a conventional technique, the number of slots for which insulation reliability needs to be ensured cannot be sufficiently reduced. Therefore, the applied voltage to the coil is increased, and consequently the rotating electric machine is increased in torque. It cannot cope with high output. Thus, there is a need for a technique that can further reduce the number of slots that require insulation reliability.

  The present embodiment provides a stator for a rotating electrical machine that can further reduce the number of slots that need to ensure insulation reliability, and can cope with higher torque and higher output of the rotating electrical machine. To do.

  A stator of a rotating electrical machine according to the present embodiment is a stator of a rotating electrical machine in which a plurality of coils are provided in a plurality of slots of a stator core, and each phase coil includes a plurality of magnetic poles. Unit coil, the unit coil on the power supply terminal side is arranged together with the unit coil included in the same phase coil in the slot, and the unit coil on the neutral point side included in the different phase coil in the slot It is arranged with.

Exploded view of the stator core constituting the stator of the rotating electrical machine according to the present embodiment The figure which shows typically an example of the connection aspect of the coil of each phase which concerns on this embodiment FIG. 1 equivalent view showing an example of a winding pattern of a U-phase coil according to the present embodiment FIG. 1 equivalent view showing an example of a winding pattern of a V-phase coil according to the present embodiment FIG. 1 equivalent view showing an example of a winding pattern of a W-phase coil according to the present embodiment FIG. 1 equivalent diagram showing an example of a conventional configuration FIG. 3 equivalent diagram showing a modified example

  Hereinafter, an embodiment according to a stator of a rotating electrical machine will be described with reference to the drawings. For example, FIG. 1 shows an example of a development view of a stator core that constitutes the stator of the rotating electrical machine according to the present embodiment. The stator core is provided with a plurality of slots S [n]. Yes. In this case, the stator core is provided with 48 slots S [1] to S [48], and only the slot numbers are shown in the drawing. The slots S [1] to S [48] are provided with a plurality of phases, in this case, three-phase coils 3, 4, and 5. In this case, the coil 3 indicated by the solid line in FIG. 1 corresponds to the U phase, the coil 4 indicated by the broken line corresponds to the V phase, and the coil 5 indicated by the alternate long and short dash line corresponds to the W phase. Although detailed explanation is omitted, the stator is configured by providing the coils of the respective phases in the slots of the stator core as described above, and the rotor is rotatably arranged on the inner peripheral side of the stator. Thus, a rotating electrical machine is configured. As is well known, the stator core is formed in a generally cylindrical shape by laminating, for example, iron cores punched out of a magnetic steel sheet by pressing, and has a structure having a plurality of slots on its inner peripheral wall. Yes.

  Next, a configuration example of the coils 3, 4, 5 of each phase will be described. Hereinafter, coil 3 is referred to as U-phase coil 3, coil 4 is referred to as V-phase coil 4, and coil 5 is referred to as W-phase coil 5. For example, as shown in FIG. 2, the U-phase coil 3 has a configuration in which a first series circuit U1 and a second series circuit U2 are connected in parallel. The first series circuit U1 has a configuration in which a plurality of, in this case, eight unit coils U11 to U18, each forming a magnetic pole, are connected in series. The second series circuit U2 has a configuration in which a plurality of, in this case, eight unit coils U21 to U28, each forming a magnetic pole, are connected in series. Each of the first series circuit U1 and the second series circuit U2 has one end connected to a common power supply terminal 6 (U phase), and the other end individually connected to a coil of a different phase. They are connected to form a neutral point N1 and a neutral point N2.

  The V-phase coil 4 has a configuration in which a first series circuit V1 and a second series circuit V2 are connected in parallel. The first series circuit V1 has a configuration in which a plurality of, in this case, eight unit coils V11 to V18, each forming a magnetic pole, are connected in series. The second series circuit V2 has a configuration in which a plurality of, in this case, eight unit coils V21 to V28, each forming a magnetic pole, are connected in series. Each of the first series circuit V1 and the second series circuit V2 has one end connected to a common power supply terminal 7 (V phase), and the other end individually connected to a coil having a different phase. They are connected to form a neutral point N1 and a neutral point N2.

  The W-phase coil 5 has a configuration in which a first series circuit W1 and a second series circuit W2 are connected in parallel. The first series circuit W1 has a configuration in which a plurality of, in this case, eight unit coils W11 to W18, each forming a magnetic pole, are connected in series. The second series circuit W2 has a configuration in which a plurality of, in this case, eight unit coils W21 to W28, each forming a magnetic pole, are connected in series. Each of the first series circuit W1 and the second series circuit W2 has one end connected to a common power supply terminal 8 (W phase), and the other end individually connected to a coil of a different phase. They are connected to form a neutral point N1 and a neutral point N2.

  Next, winding patterns of the U-phase coil 3, the V-phase coil 4, and the W-phase coil 5 will be described. Of the plurality of unit coils constituting the U-phase coil 3, V-phase coil 4, and W-phase coil 5, the unit coil closest to the power supply terminals 6, 7, 8 is the first unit coil, and the power supply terminal The unit coil farthest from 6, 7 and 8, that is, the unit coil closest to the neutral points N1 and N2 is the eighth unit coil.

  For example, as shown in FIG. 3, in the U-phase coil 3, the first unit coil U11 constituting the first half of the first series circuit U1 on the power supply terminal 6 side is concentrically wound around the slots S [1] and S [43]. The second unit coil U12 is formed concentrically in the slots S [37] and S [31], the third unit coil U13 is formed concentrically in the slots S [25] and S [19], The fourth unit coil U14 is configured by concentric winding in the slots S [13] and S [7]. In this case, the first unit coil U11 to the fourth unit coil U14 constitute a large coil having a larger coil diameter than the fifth unit coil U15 to the eighth unit coil U18.

  Further, the U-phase coil 3 is formed by concentrically winding slots S [48] and S [44] in a fifth unit coil U15 that constitutes the second half of the first series circuit U1 on the neutral point N1 side. Six unit coils U16 are formed concentrically in slots S [36] and S [32], a seventh unit coil U17 is formed concentrically in slots S [24] and S [20], and an eighth unit coil U18. However, the slots S [12] and S [8] are concentrically wound. In this case, the fifth unit coil U15 to the eighth unit coil U18 constitute a small coil having a smaller coil diameter than the first unit coil U11 to the fourth unit coil U14.

  In this case, the first unit coil U11 and the fifth unit coil U15 are concentric, the second unit coil U12 and the sixth unit coil U16 are concentric, the third unit coil U13 and the seventh unit coil U17 are concentric, The fourth unit coil U14 and the eighth unit coil U18 are concentric.

  In the U-phase coil 3, the first unit coil U21 constituting the first half of the second series circuit U2 on the power supply terminal 6 side is formed concentrically in the slots S [1] and S [7]. The unit coil U22 is formed concentrically in the slots S [13] and S [19], the third unit coil U23 is formed concentrically in the slots S [25] and S [31], and the fourth unit coil U24 is formed. The slots S [37] and S [43] are concentrically wound. In this case, the first unit coil U21 to the fourth unit coil U24 constitute a large coil having a larger coil diameter than the fifth unit coil U25 to the eighth unit coil U28.

  Further, the U-phase coil 3 is formed by concentrically winding slots S [2] and S [6] in a fifth unit coil U25 that constitutes the second half of the second series circuit U2 on the neutral point N2 side. A six unit coil U26 is formed concentrically in the slots S [14] and S [18], a seventh unit coil U27 is formed concentrically in the slots S [26] and S [30], and an eighth unit coil U28. However, the slots S [38] and S [42] are concentrically wound. In this case, the fifth unit coil U25 to the eighth unit coil U28 constitute a small coil having a smaller coil diameter than the first unit coil U21 to the fourth unit coil U24.

  In this case, the first unit coil U21 and the fifth unit coil U25 are concentric, the second unit coil U22 and the sixth unit coil U26 are concentric, the third unit coil U23 and the seventh unit coil U27 are concentric, The fourth unit coil U24 and the eighth unit coil U28 are concentric.

  In this case, the U-phase coil 3 is, for example, a fourth unit coil U24 that constitutes another series circuit U2 between the first unit coil U11 that constitutes the first series circuit U1 and the next second unit coil U12. Is provided. In other words, the U-phase coil 3 is configured to be a “separator” in which two consecutive unit coils in the same series circuit are separated by unit coils belonging to another series circuit.

  FIG. 4 shows the winding pattern of the V-phase coil 4, and FIG. 5 shows the winding pattern of the W-phase coil 5. Although detailed description is omitted, the winding pattern of the V-phase coil 4 and the W-phase coil 5 is also the winding of the U-phase coil 3 except that the position (slot number) of the slot in which each unit coil is formed is different. The winding pattern is similar to the pattern. Accordingly, in the V-phase coil 4 and the W-phase coil 5, the first unit coil to the fourth unit coil constituting the first half of each series circuit on the power supply terminal side form a large coil, followed by the neutral point. The fifth unit coil to the eighth unit coil constituting the latter half of each series circuit on the side form a pattern that forms a small coil. In the V-phase coil 4 and the W-phase coil 5, the first unit coil and the fifth unit coil are concentric, the second unit coil and the sixth unit coil are concentric, and the third unit coil and the seventh unit coil are concentric. Thus, the pattern is such that the fourth unit coil and the eighth unit coil are concentric. In addition, the V-phase coil 4 and the W-phase coil 5 are also configured as “separate poles” in which two consecutive unit coils in the same series circuit are separated by unit coils belonging to another series circuit.

  The U-phase coil 3, V-phase coil 4, and W-phase coil 5 constituted by the winding patterns as described above are unit coils on the power supply terminals 6, 7, 8 side (in this case, the first unit coil to the first unit coil). 4 unit coils) are arranged together with the unit coils included in the coils of the same phase in the slot, and the unit coils on the neutral points N1 and N2 side (in this case, the fifth unit coil to the eighth unit coil) are out of phase in the slot. It becomes the structure arrange | positioned with the unit coil contained in a coil.

  That is, for example, the U-phase coil 3 is a first unit coil in which the first unit coil U11 of the first series circuit U1 on the power supply terminal 6 side constitutes the in-phase second series circuit U2 in the slot S [1]. It arrange | positions with U21 and is arrange | positioned with the 4th unit coil U24 which comprises the 2nd series circuit U2 of an in-phase in slot S [43]. In addition, the U-phase coil 3 includes a third unit coil U23 in which the second unit coil U12 of the first series circuit U1 on the power supply terminal 6 side constitutes the in-phase second series circuit U2 in the slot S [31]. In the slot S [37], it is arranged together with the fourth unit coil U24 constituting the in-phase second series circuit U2. Further, in the U-phase coil 3, the third unit coil U13 of the first series circuit U1 on the power supply terminal 6 side is the second unit coil U22 that constitutes the in-phase second series circuit U2 in the slot S [19]. In the slot S [25], the third unit coil U23 is disposed together with the third unit coil U23 that constitutes the in-phase second series circuit U2. In addition, the U-phase coil 3 includes the first unit coil U21 in which the fourth unit coil U14 of the first series circuit U1 on the power supply terminal 6 side constitutes the in-phase second series circuit U2 in the slot S [7]. In the slot S [13], the second unit coil U22 is disposed together with the second unit coil U22 that constitutes the in-phase second series circuit U2.

  Further, in the U-phase coil 3, the fifth unit coil U15 of the first series circuit U1 on the neutral point N1 side has the first series circuit W1 of the W-phase coil 5 in a different phase in the slot S [44]. It arrange | positions with the 6th unit coil W16 which comprises, and is arrange | positioned with the 5th unit coil V15 which comprises the 1st series circuit V1 of the V phase coil 4 which is a different phase in slot S [48]. Further, in the U-phase coil 3, the sixth unit coil U16 of the first series circuit U1 on the neutral point N1 side has the first series circuit W1 of the W-phase coil 5 in a different phase in the slot S [32]. It arrange | positions with the 7th unit coil W17 which comprises, and is arrange | positioned with the 6th unit coil V16 which comprises the 1st series circuit V1 of the V phase coil 4 which is a different phase in slot S [36]. Further, in the U-phase coil 3, the seventh unit coil U17 of the first series circuit U1 on the neutral point N1 side has the first series circuit W1 of the W-phase coil 5 in a different phase in the slot S [20]. It arrange | positions with the 8th unit coil W18 to comprise, and is arrange | positioned with the 7th unit coil V17 which comprises the 1st series circuit V1 of the V phase coil 4 which is a different phase in slot S [24]. In addition, the U-phase coil 3 is configured such that the eighth unit coil U18 of the first series circuit U1 on the neutral point N1 side has the first series circuit W1 of the W-phase coil 5 in a different phase in the slot S [8]. It arrange | positions with the 5th unit coil W15 to comprise, and is arrange | positioned with the 8th unit coil V18 which comprises the 1st series circuit V1 of the V phase coil 4 which is a different phase in slot S [12].

  Although not described in detail, the V-phase coil 4 also has slots for the first unit coils V11 to V14 of the first series circuit V1 on the power supply terminal 7 side and the first unit coils V21 to V24 of the second series circuit V2. The fifth unit coils V15 to V18 of the first series circuit V1 on the neutral point N1 side and the fifth of the second series circuit V2 on the neutral point N2 side are arranged together with the unit coils included in the coils of the same phase. The unit coils V25 to V28 are arranged together with the unit coils included in the different phase coils in the slot. Also, the W-phase coil 5 includes the first unit coils W11 to W14 of the first series circuit W1 on the power supply terminal 8 side and the first unit coils W21 to W24 of the second series circuit W2 in the same phase coil in the slot. The fifth unit coils W15 to W18 of the first series circuit W1 on the neutral point N1 side and the fifth unit coils W25 to W28 of the second series circuit W2 on the neutral point N2 side are slots. It has the structure arrange | positioned with the unit coil contained in the coil of a different phase in the inside.

  In the configuration according to the present embodiment, for example, the slot in which the voltage is highest in the U-phase coil 3, that is, the slot into which the unit coils having different phases on the power supply terminal 6 side are inserted is the U The slot S [6] into which the fifth unit coil U25 belonging to the second series circuit U2 of the phase coil 3 and the fifth unit coil V25 belonging to the second series circuit V2 of the V-phase coil 4 are inserted. On the other hand, for example, in the configuration of the conventional winding pattern shown in FIG. 6, for example, the slot in which the voltage is highest in the U-phase coil 3 ′, that is, the slot in which unit coils having different phases on the power terminal side are inserted. For example, the slot into which the second unit coil U22 ′ belonging to the second series circuit U2 ′ of the U-phase coil 3 ′ and the second unit coil V22 ′ belonging to the second series circuit V2 ′ of the V-phase coil 4 ′ are inserted. S [6]. It has been confirmed that the voltage of the slot S [6] in this embodiment is reduced to about 0.57 times the voltage of the slot S [6] in the conventional configuration. In other words, according to the present embodiment, the voltage applied to the slot into which the unit coil of the different phase is inserted can be reduced compared to the conventional configuration. It can be unnecessary. As a result, the number of slots that need to ensure insulation reliability can be further reduced, and it is possible to sufficiently cope with higher torque and higher output of the rotating electrical machine.

  In the present embodiment, the coils 3, 4 and 5 of each phase are arranged together with the unit coils included in the coils of the same phase in the slot in which the half unit coil on the power supply terminal side in each series circuit constituting each of the coils, The configuration in which the remaining half of the unit coils on the neutral point side is arranged with the unit coils included in the coils of different phases in the slot is illustrated. However, this embodiment is not limited to this configuration, and each of the coils 3, 4, and 5 of each phase includes a unit coil in which at least one unit coil on the power supply terminal side is included in the same-phase coil in the slot. The remaining unit coils on the neutral point side may be arranged together with the unit coils included in the coils of different phases in the slot.

In addition, the coils 3, 4 and 5 of each phase are not limited to the configuration in which the unit coil is formed by so-called concentric winding in which the center of the winding is the same, for example, the unit by so-called lap winding in which the center of the winding is not the same. It is good also as a structure which forms a coil.
Further, the number of unit coils included in each phase coil 3, 4, 5 can be appropriately changed, for example, by providing 12 units in each series circuit. Further, the number of stots provided in the stator core can be changed as appropriate.

  For example, as shown in FIG. 7, the U-phase coil 3 has, for example, a configuration in which the first unit coil U11 and the next second unit coil U12 constituting the first series circuit U1 are adjacent, that is, the same series circuit. It is good also as a structure used as a "neighbor pole" which is not separated by the unit coil which belongs to other series circuits between two unit coils which continue in FIG. Although not shown in FIG. 7, in this case, the V-phase coil 4 and the W-phase coil 5 also adopt the same “adjacent pole” configuration.

  A stator of a rotating electrical machine according to the present embodiment is a stator of a rotating electrical machine in which a plurality of coils are provided in a plurality of slots of a stator core, and each phase coil includes a plurality of magnetic poles. Unit coil, the unit coil on the power supply terminal side is arranged together with the unit coil included in the same phase coil in the slot, and the unit coil on the neutral point side included in the different phase coil in the slot It is arranged with. According to this configuration, it is possible to further reduce the number of slots for which it is necessary to ensure insulation reliability, and it is possible to cope with higher torque and higher output of the rotating electrical machine.

  This embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 3, 4, and 5 are coils, U11 to U18, U21 to U28, V11 to V18, V21 to V28, W11 to W18, W21 to W28 are unit coils, 6, 7, and 8 are power supply terminals, and N1, N2 Indicates a neutral point.

Claims (2)

A stator of a rotating electrical machine in which a plurality of coils are provided in a plurality of slots of a stator core,
Each of the coils of each phase has a plurality of unit coils forming magnetic poles, and the unit coil on the power supply terminal side is arranged together with the unit coils included in the coil of the same phase in the slot, A stator of a rotating electrical machine in which the unit coil on the sex point side is arranged together with the unit coil included in the coil having a different phase in the slot.   2. The stator of a rotating electrical machine according to claim 1, wherein each of the coils of each phase has at least one of the unit coils on the power supply terminal side disposed together with the unit coil included in the coil of the same phase in the slot. .

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