JP5965207B2 - Motor stator - Google Patents

Description

  The present invention includes a plurality of teeth arranged along a circumferential direction, and a plurality of sets of multi-phase coils wound around the teeth. The present invention relates to a stator of a motor that generates a rotating magnetic field in the circumferential direction by rotating a rotor and rotates a rotor (rotor).

  As a stator incorporated in a motor, a plurality of divided core portions are annularly arranged having teeth divided into a stator core, insulating members attached to the teeth, and coils wound around the teeth via the insulating members. A stator formed as described above has been proposed.

  In a motor having this stator, a configuration in which a coil terminal of each divided core portion is conventionally connected to a bus ring (annular conductor) connected to a voltage terminal of each phase is employed.

  In the stator of the motor employing such a configuration, the number of bus rings corresponding to the number of phases is prepared, and the terminals of the coils of the same phase are electrically connected to one bus ring via the terminal. For this reason, there are many parts necessary for the connection processing of the coil terminals, which increases the manufacturing cost of the stator of the motor, and the work of the connection processing is complicated, leading to a decrease in productivity.

  In order to avoid an increase in manufacturing cost and a decrease in productivity, a motor including a stator that does not use a bus ring, a so-called bus ring-less motor has been proposed (see Patent Document 1).

  9 is a front view of the stator 1010 disclosed in Patent Document 1, FIG. 10 is a perspective view of the divided core portion 1014 forming the stator 1010, and FIG. 11 is a partial cross-sectional view of the divided core portion 1014.

  9 to 11, a stator 1010 is a six-pole three-phase Y-type stator, and includes a hollow holder (housing) 1012, three-phase voltage supply terminals U, V, and W, and a neutral point. And a stator core 1016 formed by annularly arranging 18 divided core portions 1014 along the inner peripheral surface 1012a of the holder 1012.

  Stator core 1016 is formed by annularly arranging a plurality of divided core portions 1014 such that U-phase, V-phase, and W-phase coils 1018 are repeatedly arranged six times in the clockwise direction.

  The split core portion 1014 is wound around the teeth 1024 via the insulating member 1026 and the teeth (divided iron core) 1024 configured by laminating a plurality of metal plates 1022, the insulating member 1026 electrically insulating the teeth 1024. A coil 1018 composed of a coil wire (coil conductor) 1018a. The coil wire 1018a is a rectangular wire / insulation-coated conductive wire having a rectangular cross section.

  The insulating member 1026 protrudes from the winding portion 1038 (1038a, 1038b) around which the coil strand 1018a is wound, and the arrow B1 direction from the winding portion 1038, and the coil terminal of each coil strand 1018a (voltage supply terminal for each phase) The voltage supply terminals U, V, W and neutral along the direction of arrow C) are connected to U, V, W at one end side coil terminal and the other end side coil terminal formed at neutral point terminal N). A routing portion 1040 for routing to the point terminal N is provided.

  The routing portion 1040 includes a plate-like portion 1050 and a coil terminal storage portion 1052 formed on the plate-like portion 1050.

  The coil terminal storage unit 1052 is configured to store the coil terminal on one end side or the coil terminal on the other end side of the coil wire 1018 a wound around the winding unit 1038 in the arrow C direction.

  That is, the coil terminal storage part 1052 extends along the direction of arrow C, and is a width (in the direction of arrow A) that can store the coil terminal on one end side or the coil terminal on the other end side of the flat coil wire 1018a. Coil terminal holding grooves 1056 to 1059 having a length along the arrow A) and a depth (a depth along the arrow B direction) are provided at predetermined intervals in the arrow A direction.

  In the stator core 1016, in each divided core portion 1014, a coil wire 1018a having a rectangular wire having the same shape is wound to constitute a coil 1018. In the coil terminal storage unit 1052, the coil terminal on one end side of the coil wire 18a or the coil terminal on the other end side is routed in the arrow C direction with the long side of the rectangular wire aligned with the arrow A direction. The coil terminal holding grooves 1056 to 1059 are housed. Therefore, the coil terminal holding grooves 1056 to 1059 have substantially the same width (height).

  Further, as shown in FIG. 11, the depth of the uppermost coil terminal holding groove 1056 among the coil terminal holding grooves 1056 to 1059 is formed deeper than the depth of the other coil terminal holding grooves 1057 to 1059. Yes.

  Specifically, referring to FIG. 9, in FIG. 9, the coil terminals on one end side of the three coil strands 1018a constituting the U1-phase to U3-phase coils 1018 are counterclockwise. A coil terminal on one end side of each of the three coil strands 1018a constituting the V1 phase to V3 phase coil 1018 connected to the supply terminal U is connected to the voltage supply terminal V counterclockwise, and W1 phase to W3. The coil terminal on one end side of each of the three coil wires 1018a constituting the phase coil 1018 is connected to the voltage supply terminal W counterclockwise, and the three coils constituting the U4 phase to U6 phase coil 1018 The coil terminal on one end side of the strand 1018a is connected to the voltage supply terminal U in the clockwise direction, and the coil terminals on one end side of the three coil strands 1018a constituting the V4 phase to V6 phase coil 1018 are Turn clockwise Supply is connected to the terminal V, 3 coiled terminal one end of each coil wire 1018a of constituting the coil 1018 of W4 phase ~W6 phase is connected to the voltage supply terminal W clockwise.

  On the other hand, the coil terminals on the other end side of the nine coil wires 1018a constituting the coils 18 of U1, V1,..., V2, W3 are connected to the neutral point terminal N counterclockwise, and U4, The coil terminals on the other end side of each of the nine coil wires 1018a constituting the coils 1018 of V4,... V6, W6 are connected to the neutral point terminal N in the clockwise direction.

  Therefore, in the deepest coil terminal holding groove 1056, in the vicinity of the neutral point terminal N, the coil terminals on the other end side of the nine coil wires 1018a in total overlap each other and are drawn and stored. (See FIG. 11).

JP 2012-16100 A

  However, in the motor stator 1010 according to the related art configured as described above, the coil terminals of all the U-phase, V-phase, and W-phase coils 1018 are bundled together at one point of the neutral point terminal N. Since the connection is made, the depth (height) of the coil terminal holding groove 1056 becomes deep (high), and the stacking direction of the coil terminal bundle (arrow A direction), in this case, the length in the radial direction of the motor There is a problem that the size of the stator 1010 becomes large.

  Further, since the distance to which the coil terminal forming the neutral point terminal N is routed is long, for example, the coil terminal on the neutral point side of the W3 phase is routed about a half turn counterclockwise in FIG. The coil terminal on the neutral point side of the U4 phase connected to N is routed about half a clockwise in FIG. 9 and connected to the neutral point terminal N, so that the copper loss at the coil terminal increases. There is a problem of end.

  Similarly, FIG. 12 shows an example of a 6-pole motor Y-connection 6-parallel stator 2010 according to a comparative example having the problems that the stator size increases in the radial length of the motor and the copper loss at the coil end is large. FIG. 13A is a cross-sectional view of the divided core portion 2014 constituting the stator 2010 in the vicinity of the voltage supply terminals U, V, and W. FIG. 13B is an enlarged view of the crossover portion in the cross-sectional view of FIG. A cross-sectional view is shown.

  12, 13 </ b> A, and 13 </ b> B, in the vicinity of the voltage supply terminals U, V, and W, the coil terminal storage portion 2052 of the insulating member 2026 is wound around the winding portion 2038 of the insulating member 2026 on the stator core 2016. Since each of the three U, V, and W phase crossover wires of the coil end of the coil 2018 and the nine crossover wires of the neutral terminal N of the coil end that is connected at one point are accommodated, the one point concentrated connection In order to accommodate the connecting wire of the neutral point terminal N for use, the size of the insulating member 2026 is required in the coil terminal accommodating portion 2052. For this reason, as shown in FIG. 13B, an unnecessary space 2030 of the insulating member 2026 is generated on the lower side of each of the three U, V, and W phase crossover storage units.

  FIG. 14 shows a stator 3010 in parallel with a 12-pole motor Y connection 12 according to another comparative example having the problems that the stator size is increased in the radial length of the motor and the copper loss at the coil end is large. A cross-sectional view in the vicinity of the voltage supply terminals U, V, and W of the split core portion 3014 is shown.

  In the example of FIG. 14, in the vicinity of the voltage supply terminals U, V, and W, the coil of the coil 3018 wound around the coil end accommodating portion 3052 of the insulating member 3026 and the winding portion 3038 of the insulating member 3026 on the stator core 3016. Since each of the six U, V, and W phase connecting wires of the terminal and the connecting wire of the neutral point terminal N to which 18 wires are connected at one point in a concentrated manner, the neutral point terminal N for the one point concentrated connection is accommodated. In order to accommodate the crossover wire, the size of the insulating member 3026 is required in the coil terminal accommodating portion 3052. For this reason, the stator 3010 in parallel with the 12-pole motor Y connection 12 has a problem that the radial size is further increased.

  The present invention has been made in consideration of such problems, and suppresses an increase in the size of the stator in the stacking direction of the coil terminal bundle, and a plurality of phases constituting the neutral point connection portion. An object of the present invention is to provide a stator for a motor that can reduce copper loss caused by a coil end bundle.

  A stator of a motor according to the present invention includes a plurality of teeth arranged along a circumferential direction, and a plurality of sets of multi-phase coils wound around the teeth, and a plurality of sets of the plurality of phases. For each coil of each phase of the coil, a coil terminal on one end side is connected to a corresponding voltage terminal of each phase, and the coil of each phase of the plurality of sets of the plurality of phase coils is connected to the teeth. In a stator of a motor provided with a coil winding portion wound around the coil winding portion and a coil terminal on the other end side drawn out from the coil winding portion, a plurality of sets of the coils of the plurality of phases are arranged in a circumferential direction. The coil terminals on the other end side of the plurality of phases adjacent to each other are connected to form a plurality of neutral point connection parts, and the plurality of neutral point connection parts are arranged apart from each other. It is characterized by.

  According to the present invention, a plurality of neutral point connection portions for each of the plurality of phase coils, which are formed by connecting the plurality of coil terminals adjacent in the circumferential direction, are arranged apart from each other. Thus, as in the prior art, when forming the neutral point connection part by bundling all the coil terminals of a plurality of sets of multi-phase coils and connecting them at one place, the neutral point connection part is formed. A bundle of clockwise coil terminals of a plurality of phases and another bundle of coil terminals of a plurality of clockwise phases constituting another neutral point connection portion are routed so as to overlap each other in the circumferential direction. Can be suppressed.

  Therefore, it is possible to suppress an increase in the size of the stator in the stacking direction of the coil terminal bundles, as compared with the conventional technique in which all the coil terminals of a plurality of sets of multi-phase coils are bundled and connected at one place.

  Also, compared to the prior art in which all coil terminals of a plurality of sets of multi-phase coils are bundled together and connected in one place, the bundle of multi-phase coil terminals constituting the neutral point connection portion is different from Since it can suppress that the bundle | flux of another coil terminal of the multiple phase which comprises a sex point connection part overlaps with each other in the circumferential direction, the multiple phase which comprises the said neutral point connection part It can suppress that the length of the bundle | flux of the coil terminal becomes long. Therefore, the copper loss which arises in the coil end bundle of the multiphase which comprises the said neutral point connection part can be reduced.

  In this case, the stator includes an insulating member attached to the teeth, and the insulating member is provided with a groove portion having an opening at least at one end, and the neutral point connection portion is provided in the groove portion. It is housed.

  Thus, by accommodating the neutral point connection part in the groove part of the insulating member attached to the tooth, the insulation with respect to the periphery of the neutral point connection part can be improved.

  Therefore, for example, as compared with a case where an insulating material is applied to the neutral point connection portion or an insulating cap is attached, an additional material or an additional part is not necessary, so that an increase in cost can be suppressed.

  Furthermore, it is preferable that the coil terminal and the neutral point connection portion on the other end side are accommodated in the common groove portion.

  Thus, by accommodating the coil terminal and the neutral point connection part in the common groove part, it is not necessary to provide another groove part for accommodating the neutral point connection part, and the configuration of the insulating member can be simplified. .

  Further, the neutral point connection portion is accommodated in the groove portion by bending a bundle of the coil terminals on the other end side of the plurality of phases constituting the neutral point connection portion to one side in the circumferential direction. The coil terminals on the other end side of the plurality of phases are preferably formed so that the coil terminals on the other side in the circumferential direction are longer.

  When bending a bundle of multiple-phase coil terminals constituting a neutral point connection part to one side in the circumferential direction, there is a possibility that a large tensile stress may be generated at the coil terminal located on the outer peripheral side of the bending radius. The coil terminal positioned on the outer peripheral side of the bending radius when the bundle of the coil terminals of the plural phases is bent to one side in the circumferential direction by the coil terminal positioned on the outer peripheral side of the bending radius being formed longer. The tensile stress generated in the terminal can be reduced, and damage to the coil terminal located on the outer peripheral side of the bending radius can be suppressed.

  Further, the coil terminals on the other end side of the plurality of phases constituting the neutral point connection portion are arranged on both sides in the circumferential direction with respect to a coil located in the center in the circumferential direction of the coils of the plurality of phases. It is preferable that the coil positioned in the circumferential direction is routed in the circumferential direction toward the coil positioned in the center in the circumferential direction.

  According to the present invention, a plurality of neutral point connection portions for each of the plurality of phase coils are arranged apart from each other, thereby bundling all the coil terminals of the plurality of sets of the plurality of phase coils at one place. Compared with the prior art which connects, it can suppress that the size of a stator becomes large in the lamination direction of a coil terminal bundle.

  In addition, a bundle of coil terminals of a plurality of phases constituting the neutral point connection part and a bundle of coil terminals of a plurality of phases constituting another neutral point connection part overlap each other in the circumferential direction. Therefore, it is possible to reduce copper loss generated in a plurality of coil end bundles constituting the neutral point connection portion.

It is a partial omission front view of the stator of a motor concerning this embodiment. It is a circuit diagram of the stator of the example of FIG. It is a perspective view of the stator of the example of FIG. 4A is a partially enlarged view of the stator of FIG. 1 example. FIG. 4B is a partially enlarged view of a modified stator. It is a VV line partial omission sectional view of the stator of Drawing 4A. FIG. 4B is a partially omitted sectional view taken along line VI-VI of the stator of FIG. 4A. FIG. 6 is a partially omitted cross-sectional view corresponding to FIG. 5 of a starter according to another embodiment. FIG. 7 is a partially omitted cross-sectional view corresponding to FIG. 6 of a stator according to another embodiment. It is a front view of the stator which concerns on a prior art. It is a perspective view of the split core part which forms the stator shown in FIG. It is a partial cross section figure of the division | segmentation core part shown in FIG. It is a partially-omission perspective view of the stator which concerns on a comparative example. 13A is a cross-sectional view in the vicinity of the voltage supply terminal of the stator shown in FIG. 12, and FIG. 13B is a partially omitted enlarged cross-sectional view in the vicinity of the voltage supply terminal. It is sectional drawing in the voltage supply terminal vicinity of the stator which concerns on another comparative example.

  A preferred embodiment of a motor stator according to the present invention will be described below in detail with reference to the accompanying drawings.

[Embodiment]
FIG. 1 is a partially omitted front view of a substantially cylindrical stator 10 of 6-pole motor Y-type connection 6 parallel (Y-type connection full parallel) according to this embodiment. The stator 10 that generates a rotating magnetic field (field) constitutes a motor in combination with a rotor (rotor) (not shown) provided therein, for example, as a motor (electric motor) or a generator (generator) of an electric vehicle. Used. As the electric vehicle, an electric vehicle using a power storage device such as a battery or a capacitor as a power source, a hybrid vehicle using the power storage device and an internal combustion engine as a power source or a drive source, or a fuel cell and the power storage device as a power source. The target is fuel cell vehicles and the like. The rotor may be a rotor having no permanent magnet, such as a permanent magnet rotor having a permanent magnet or a rotor rotating by reluctance torque.

  In addition, in the stator 10 shown in FIG. 1, the components other than the insulating member 26 having the coil terminal housing portion 52 and the neutral point connection portion N (N1, N2,. FIG. 11), the comparative example (FIGS. 12, 13A and 13B), and other comparative examples (FIG. 14) are basically the same in configuration, and detailed description thereof is omitted.

  The stator 10 is a salient-pole stator, and includes three-phase voltage supply terminals U, V, and W, and six neutral point connection portions N (N1, N2,..., N6) that form neutral points. And a stator core 16 formed by arranging a plurality (18 in FIG. 1) of divided core portions 14 in an annular shape.

  The stator core 16 includes six divided core portions 14 each having a plurality of phases, here U-phase, V-phase, and W-phase coils 18. In this case, in the stator core 16, the plurality of divided core portions 14 are arranged in a ring shape, whereby a U phase (U1 phase to U6 phase), a V phase (V1 phase to V6 phase), and a W phase (W1 phase to W6). The coils 18 are arranged in the order of U1, V1, W1, U2,..., U6, V6, W6 in the counterclockwise direction of FIG. That is, the stator 10 includes 18 teeth 24 arranged in an annular shape along the circumference, and six sets of three-phase coils 18 wound around each tooth 24.

  FIG. 2 is a circuit diagram of the stator 10 having the three-phase Y-type connection coil 18 described above. The U-phase, V-phase, and W-phase coils 18 are all connected in parallel. Six coil terminals on one end side of U1 phase to U6 phase are connected by a fusing process or the like and connected to voltage supply terminal U, and six coil terminals on one end side of V1 phase to V6 phase are connected to each other. Similarly connected and connected to the voltage supply terminal V, the six coil terminals on one end side of the W1 phase to W6 phase coils 18 are similarly connected and connected to the voltage supply terminal W.

  The three coil terminals on the other end side of the U1, V1, and W1 phases are connected by a fusing process or the like to form a neutral point connection portion N1, and the other ends of the U2, V2, and W2 phases. The three coil terminals on the part side are similarly connected to form a neutral point connection part N2, and the three coil terminals on the other end side of the U3 phase, V3 phase, and W3 phase are similarly connected to each other. The neutral point connection portion N3 is formed, and the three coil terminals on the other end side of the U4 phase, V4 phase, and W4 phase are similarly connected to form the neutral point connection portion N4, and the U5 phase, The three coil terminals on the other end side of the V5 phase and W5 phase are similarly connected to form a neutral point connection portion N5, and the three end portions on the other end side of the U6 phase, V6 phase, and W6 phase are formed. The coil terminals are similarly connected to form a neutral point connection portion N6.

  FIG. 3 is a perspective view of the stator 10. FIG. 4A is a partially enlarged view of the stator 10. FIG. 5 is a cross-sectional view of the stator 10 of FIG. 4A taken along line VV. 6 is a cross-sectional view of the stator 10 in FIG. 4A taken along line VI-VI.

  The split core portion 14 is wound around the teeth 24 through the teeth 24 configured by laminating a plurality of metal plates (steel plates), the insulating member 26 that electrically insulates the teeth 24, and the insulating members 26. And a coil 18 constituted by a coil wire (coil conductor) 18a. The coil wire 18a is a rectangular wire having a rectangular cross section.

  The insulating member 26 is made of an electrically insulating material such as a flexible resin. The insulating member 26 protrudes radially outward of the stator 10 from the coil winding portion 38 (see FIG. 5) around which the coil wire 18a is wound, and the coil terminal ( A routing portion 40 for routing the coil terminal on one end side or the coil terminal on the other end side) to the locations of the voltage supply terminals U, V, W and the neutral point connection portion N along the circumferential direction of the stator 10. And have.

  The routing portion 40 is provided so as to protrude radially outward from the upper outer peripheral wall 46a (see FIG. 5) connected to the coil winding portion 38 of the insulating member 26.

  The routing unit 40 includes a coil terminal storage unit 52. The coil terminal accommodating part 52 is comprised so that the coil terminal of the one end part side of the coil strand 18a wound by the coil winding part 38 or the coil terminal of the other end part side can be accommodated in the circumferential direction.

  The coil terminal storage portion 52 formed on the outer side in the axial direction of the stator 10 has a width capable of storing a coil terminal on one end side or a coil terminal on the other end side of the coil wire 18a of a rectangular wire. Two coil terminal holding grooves 56 (56a, 56b, 56c, 56d) are formed along the circumferential direction.

  As shown in FIGS. 5 and 6, the axially inner coil terminal holding grooves 56a, 56b, and 56c have substantially the same depth, but the axially outer coil terminal holding grooves 56d are deep. Is formed deeper by the thickness of one coil wire 18a.

  In the coil terminal holding grooves 56a to 56c, the coil terminals on one end side or the coil terminals on the other end side of the same coil wire 18a are routed and stored.

  Specifically, six coil terminals on one end side of each coil wire 18a constituting the U1 phase to U6 phase coil 18 are connected to the voltage supply terminal U to constitute the V1 phase to V6 phase coil 18. The six coil terminals on one end side of each coil wire 18a are connected to the voltage supply terminal V, and the six coil terminals on one end side of each coil wire 18a constituting the coil 18 of W1 phase to W6 phase. Is connected to a voltage supply terminal W.

  The three coil terminals on the other end side of each coil wire 18a constituting the coil 18 of the U1, V1, and W1 phases are connected to the neutral point connection portion N1, and the U2 phase, V2 phase, and W2 phase The three coil terminals on the other end side of each coil wire 18a constituting the coil 18 are connected to the neutral point connection portion N2, and each coil wire constituting the U3 phase, V3 phase, and W3 phase coil 18 is connected. Three coil terminals on the other end side of 18a are connected to the neutral point connection portion N3, and three on the other end side of each coil wire 18a constituting the coil 18 of U4 phase, V4 phase, and W4 phase. Are connected to the neutral point connection portion N4, and the three coil terminals on the other end side of each coil wire 18a constituting the coil 18 of U5 phase, V5 phase, and W5 phase are neutral point connection portions. In addition to each coil wire 18a that is connected to N5 and constitutes a coil 18 of U6 phase, V6 phase, and W6 phase Three coils terminal parts side is connected to the neutral point wire connection N6.

  Here, as shown in FIG. 4A, the neutral point connection portion N4 includes coil terminals UC4, VC4, WC4 on the other end side of the coil wires 18a constituting the U4-phase, V4-phase, and W4-phase coils 18. (Refer to FIG. 2) The fusing process (the process of shorting the coil terminals UC4, VC4, and WC4 by removing the coating of the coil wire 18a by heat caulking) is performed at the neutral point connection portion N4 (the tip thereof). After that, as shown by an arrow 60 in FIG. 4A, it is tilted to the center side of the V4-phase coil 18, and as shown in FIG. 6, it is stored in a coil terminal holding groove 56d that is a storage portion of the neutral point connection portion N4. (Refer also to the neutral point connection part N4 etc. which are shown with the dashed-two dotted line of FIG. 1).

  That is, in FIG. 4A, the coil terminal WC4, which is the neutral point connecting wire of the W4 phase coil 18, passes through the V4 phase coil terminal holding groove 56d, which is the storage part of the neutral point connection portion N4 (see FIG. 5). Furthermore, a coil terminal WC4 that is a neutral point crossover of the W4 phase coil 18, a coil terminal VC4 of the V phase coil 18, and a coil terminal UC4 that is a neutral point crossover of the U4 phase coil 18 adjacent to the right are provided. 4A of the coil terminal holding groove 56 of the V4 phase is merged at the upper right part and connected by a fusing process to the neutral point connection part N4 at the position of the V4 phase coil 18, and then the arrow 60 As shown in FIG. 6, the V4 phase coil 18 is tilted toward the center side and is housed in a coil terminal holding groove 56 d that is a housing portion of the neutral point connection portion N 4 as shown in FIG. In this embodiment, the coil terminal holding groove 56 (56a to 56d) is configured as a groove portion provided with an opening portion at an outer diameter side end portion, but it is sufficient that an opening portion is provided at least at one end. An opening may be provided at the axial end.

  In practice, in the stator 10 shown in FIG. 1, the neutral point connection portions N1 to N6 are accommodated in the coil terminal holding groove 56d as indicated by a two-dot chain line.

[Other Embodiments]
7 and 8 are partially omitted cross-sectional views of the stator 110 in parallel with the 12-pole motor Y connection 12 according to another embodiment, corresponding to the cross-sections of the stator 10 in FIG. 4A at the positions in FIGS. 5 and 6, respectively. FIG. Since the stator 110 according to the other embodiment and the stator 10 according to the above-described embodiment have the same functional shape, the reference numerals of the stator 10 illustrated in FIG. 1 are used for convenience of understanding. The code of the stator 110 is written in parentheses.

  In this case, the insulating member 126 is made of an electrically insulating material such as a flexible resin. The insulating member 126 protrudes radially outward from the coil winding portion 38 around which the coil wire 18a is wound, and the coil terminal (one end side coil terminal or other end) of the coil wire 18a. The coil terminal on the end side) is provided with a routing portion 140 for routing the voltage supply terminals U, V, W and the neutral point connection portion N in the vicinity along the circumferential direction.

  The routing portion 140 is provided so as to protrude radially outward from the vicinity of the upper end portion of the upper outer peripheral wall 46a.

  The routing unit 140 includes a coil terminal storage unit 152. The coil terminal storage part 152 is configured to be able to store the coil terminal on one end side of the coil wire 18 a wound around the coil winding part 38 or the coil terminal on the other end side in the circumferential direction.

  The coil terminal storage part 152 has four coil terminal holding grooves 156 (156a to 156d) having a width capable of storing a coil terminal on one end side or a coil terminal on the other end side of the rectangular wire 18a. It is formed outward of the stator 110 in the axial direction.

  As shown in FIGS. 7 and 8, the four coil terminal holding grooves 156a to 156d are formed to have substantially the same depth.

  In the coil terminal holding grooves 156a to 156c, the coil terminals on one end side or the coil terminals on the other end side of the same coil wire 18a are routed and stored.

  Specifically, twelve coil terminals on one end side of each coil wire 18a constituting the U1 phase to U12 phase coil 18 are connected to the voltage supply terminal U to constitute the V1 phase to V12 phase coil 18. Twelve coil terminals on one end side of each coil wire 18a are connected to a voltage supply terminal V, and twelve coil terminals on one end side of each coil wire 18a constituting the coil 18 of the W1 phase to W12 phase. Is connected to a voltage supply terminal W.

  The three coil terminals on the other end side of each coil wire 18a constituting the coil 18 of the U1, V1, and W1 phases are connected to the neutral point connection portion N1, and the U2 phase, V2 phase, and W2 phase The three coil terminals on the other end side of each coil wire 18a constituting the coil 18 are connected to the neutral point connection portion N2, and the U18-phase, V12-phase, and W12-phase coils 18 are connected in the same manner. Three coil terminals on the other end side of each coil wire 18a to be configured are connected to a neutral point connection portion N12.

  Here, as shown in FIG. 4A, the neutral point connection portion N4 includes the coil terminals UC4, VC4 on the other end side of the coil strands 18a constituting the coils 18 of the U4 phase, the V4 phase, and the W4 phase. After the WC 4 is subjected to the fusing process at the neutral point connection portion N4, as shown by the arrow 60, the WC 4 is tilted to the center side of the V4 phase coil 18 and the neutral point connection portion N4 is stored as shown in FIG. Is stored in the coil terminal holding groove 156d.

  That is, as shown in FIG. 4A, in the example of FIG. 8, the coil terminal WC4 that is the neutral crossover of the W4 phase coil 18 is the V4 phase coil terminal that is the storage part of the neutral point connection N4. Passing through the holding groove 156d (see FIG. 7), the coil terminal WC4 that is the neutral point crossover of the W4 phase coil 18, the coil terminal VC4 of the V phase coil 18, and the U4 phase coil 18 adjacent to the right The coil terminal UC4, which is the sex point crossover wire, is joined at the upper right part in the same manner as FIG. 4A of the coil terminal holding groove 156 of the V4 phase, and is connected by the fusing process to be neutral at the position of the V4 phase coil 18. After making the point connection portion N4, as shown by the arrow 60 in FIG. 4A, it is tilted to the center side of the V4 phase coil 18, and as shown in FIG. 8, the storage portion of the neutral point connection portion N4 Is stored in the coil terminal holding groove 156d.

  In the stator 110 according to another embodiment (Y connection 12 parallel), compared to the stator 10 (Y connection 6 parallel) according to the above-described embodiment, the voltage supply terminals U, V, and W terminals are connected to each terminal. The number of coil terminal connections increases from six to twelve, but the number of coil terminal connections of the neutral point connection portions N1 to N12 is the same as three. In other embodiments as well, the coil terminal holding groove 156 (156a to 156d) is configured as a groove having an opening at the outer diameter side end, but at least one end has an opening. For example, an opening may be provided at the end in the axial direction.

[Summary of Embodiment and Other Embodiments]
The stator 10 (110) of the motor according to this embodiment includes a plurality of teeth 24 arranged along the circumferential direction and a plurality of sets wound around the teeth 24 (6 sets in the embodiment, in other embodiments). 12 sets) of multiple-phase (U-phase, V-phase, and W-phase) coils 18, and each of the multiple-phase coils 18 of each of the multiple-phase coils 18 has one end side coil. Coil terminals are connected to the corresponding voltage terminals U, V, W of each phase, and the coils 18 of each phase in the plurality of sets of the plurality of coils 18 are wound around the teeth 24. A stator 10 (110) of a motor provided with a winding part 38 and a coil terminal on the other end side drawn from the coil winding part 38.

  The stator 10 (110) of the motor has a plurality of neutral point connection portions in which the coil terminals on the other end side of the plurality of phases adjacent to each other in the circumferential direction are connected to each other in a plurality of sets of the coils of the plurality of phases. N1 to N6 (N1 to N12) are formed, and a plurality of the neutral point connection portions N1 to N6 (N1 to N12) are arranged apart from each other along the circumferential direction as shown in FIG. ing.

  In this way, a plurality of neutral point connection portions N1 to N6 (N1 to N12) for each of the coils of the plurality of phases formed by connecting the coil terminals of the plurality of phases (three phases) adjacent in the circumferential direction. By arranging them apart from each other, as in the prior art, all the coil terminals of a plurality of sets of multi-phase coils are bundled together and connected at one point to neutral point terminal N (neutral point connection portion) And a bundle of counter-clockwise multi-phase coil terminals constituting the neutral point connection portion and another clockwise multi-phase coil constituting another neutral point connection portion. It is possible to suppress the bundle of terminals from being routed so as to overlap each other in the circumferential direction.

  Therefore, a conventional technique (FIG. 9), a comparative example (FIG. 12), and another comparative example (FIG. 14) in which all coil terminals of a plurality of sets of multiple-phase coils are bundled together and connected at one place {hereinafter referred to as a conventional technique (FIGS. 9, 12, and 14). }, The size of the stators 10 and 110 can be suppressed from increasing in the stacking direction of the coil end bundle.

  Moreover, compared with the prior art (FIGS. 9, 12, and 14) in which all coil terminals of a plurality of sets of multiple-phase coils are bundled together and connected at one place, a plurality of phases constituting the neutral point connection portion. The bundle of coil terminals and the bundle of other coil terminals of a plurality of phases constituting another neutral point connecting portion can be prevented from being overlapped with each other in the circumferential direction. It can suppress that the length of the bundle | flux of the multi-phase coil terminal which comprises a neutral point connection part becomes long. Therefore, the copper loss which arises in the coil end bundle of the multiphase which comprises the said neutral point connection part can be reduced.

  In this case, the stator 10 (110) includes an insulating member 26 (126) attached to the tooth 24, and the insulating member 26 (126) includes an opening at at least one end in the axial direction of the stator 10 (110). The coil end holding groove 56 (156) that is a groove portion is provided, and the neutral point connection portions N1 to N6 (N1 to N12) are accommodated in the coil end holding groove 56 (156) that is the groove portion. .

  By storing the neutral point connection portions N1 to N6 (N1 to N12) in the coil terminal holding groove 56 (156) which is the groove portion of the insulating member 26 (126) attached to the tooth 24, the neutral point connection portion N1 Insulation with respect to the periphery of ˜N6 (N1 to N12) can be improved.

  Therefore, for example, as compared with the case of applying an insulating material or attaching an insulating cap to the neutral point connection portions N1 to N6 (N1 to N12), an additional material or an additional part becomes unnecessary, so that the cost is reduced. Can be suppressed.

  Further, the coil terminal on the other end side, for example, the coil terminal WC4 and the neutral point connection part, for example, the neutral point connection part N4 (coil terminals UC4, VC4, WC4) are common groove parts as shown in FIG. It is preferable to be accommodated in the coil terminal holding groove 156d.

  Thus, by accommodating the coil terminal WC4 and the neutral point connection part N4 (coil terminals UC4, VC4, WC4) in the coil terminal holding groove 56d (156d) which is a common groove part, the neutral point connection part is There is no need to provide another groove for accommodating, and the configuration of the insulating member 26 (126) can be simplified.

  Further, the neutral point connection part, for example, the neutral point connection part N4, as shown in FIG. 1 and FIG. 4A, is the other end side of a plurality of phases (U4, V4, W4 phase) constituting the neutral point connection part N4. The coil terminal holding groove which is a groove part by bending a bundle of coil terminals UC4, VC4, WC4 (FIG. 2) of about 90 degrees to one side in the circumferential direction (arrow 60 side, coil terminal WC4 side in FIG. 4A). 56d (156d), the coil terminals UC4, VC4, WC4 on the other end side of the plurality of phases (U4, V4, W4) are formed longer on the coil terminal UC4 on the other side in the circumferential direction. It is preferable that

  In this case, when the bundle of the coil terminals of the plural phases constituting the neutral point connection portion N4 is bent to one side in the circumferential direction, a large tensile stress is generated in the coil terminal UC4 located on the outer peripheral side of the bending radius. However, since the coil terminal UC4 located on the outer peripheral side of the bending radius is formed longer, when bending a bundle of a plurality of coil terminals to one side in the circumferential direction, The tensile stress generated in the coil terminal UC4 located on the outer peripheral side can be reduced, and damage to the coil terminal UC4 located on the outer peripheral side of the bending radius can be suppressed.

  Furthermore, as shown in FIG. 4A, the coil terminals UC4, VC4, WC4 on the other end side of a plurality of phases (U4, V4, W4 phase) constituting the neutral point connection part, for example, the neutral point connection part N4, Among coils of a plurality of phases (U4, V4, W4 phases), coils located on both sides in the circumferential direction (coil of W4 and coil of U4) with respect to a coil located at the center in the circumferential direction (coil of V4) From the viewpoint of reducing the copper loss, it is preferable that the wire is routed in the circumferential direction toward the coil (coil of V4) located at the center in the circumferential direction.

  That is, as shown in FIG. 4B as a modified example, not with respect to the coil terminal VC4 of the coil (coil V4) located in the center in the circumferential direction (for example, a coil located on one side in the circumferential direction (for example, Coil terminal VC4 of coil (V4 coil) and coil terminal U4 (coil of U4) located on the other side in the circumferential direction with respect to coil terminal WC4 of coil W4). When configured to route the coil terminal UC4, an extra overlap OL occurs in the coil terminal UC4 as compared to the example of FIG. 4A, and the copper loss increases by this overlap OL.

  According to this embodiment and other embodiments, a plurality of neutral point connection portions N1 to N6 (N1 to N12) for each of the coils of a plurality of phases (U, V, and W phases) are arranged apart from each other. By combining the coil terminals of all the coils of a plurality of phases (U phase, V phase, and W phase) in a plurality of sets (here, 6 sets and 12 sets) and connecting them at one place In comparison, the size of the stators 10 and 110 can be suppressed from increasing in the stacking direction of the coil terminal bundle.

  In addition, a bundle of coil terminals of a plurality of phases constituting the neutral point connection parts N1 to N6 (N1 to N12) and another phase of a plurality of phases constituting another neutral point connection part N1 to N6 (N1 to N12). Since it can suppress that the bundle | flux of a coil terminal is mutually overlapped in the circumferential direction, it is the coil terminal bundle of the multiphase which comprises neutral point connection part N1-N6 (N1-N12) The resulting copper loss can be reduced.

  The present invention is not limited to the above-described embodiment. For example, a portion 42 surrounded by a broken line in FIG. 6 and a portion 142 surrounded by a broken line in FIG. 8 are portions that can be appropriately reduced. It is naturally possible to adopt various configurations without departing from the gist of the present invention, such as downsizing the stators 10 and 110 in the radial direction.

DESCRIPTION OF SYMBOLS 10, 110 ... Stator 14 ... Divided core part 18 ... Coil 24 ... Teeth 26, 126 ... Insulating member 38 ... Coil winding part 40, 140 ... Leading part 56, 56a-56d, 156, 156a-156d ... Coil terminal holding groove N1-N12 ... neutral point connection part UC4, VC4, WC4 ... coil terminal

Claims (4)

A plurality of teeth arranged along the circumferential direction;
A plurality of sets of multi-phase coils wound around the teeth;
Have
For each phase coil of the plurality of sets of the plurality of phase coils, the coil terminal on one end side is connected to the corresponding voltage terminal of each phase,
The coil of each phase in the plurality of sets of the coils of the plurality of phases is
A coil winding portion wound around the teeth;
A coil terminal on the other end side drawn from the coil winding portion;
In the stator of a motor with
For each of a plurality of sets of the coils of the plurality of phases, the coil terminals on the other end side of the plurality of phases adjacent in the circumferential direction are connected to each other to form a plurality of neutral point connection portions,
A plurality of the neutral point connecting portions are arranged apart from each other ;
Before Symbol stator,
An insulating member attached to the teeth;
The insulating member is provided with a groove having an opening at at least one end,
The neutral point connection portion is accommodated in the groove portion. The stator of the motor according to claim 1 ,
The stator of a motor, wherein the coil terminal and the neutral point connection portion on the other end side are accommodated in a common groove portion. In the stator of the motor according to claim 1 or 2 ,
The neutral point connecting portion is arranged such that the longitudinal direction of the bundle of coil ends on the other end side of the plurality of phases constituting the neutral point connecting portion is arranged along one side in the circumferential direction. Are housed in
The coil terminal on the other end side of the plurality of phases is
The stator of the motor, wherein the coil terminal on the other side in the circumferential direction is formed longer. In the stator of the motor according to any one of claims 1 to 3 ,
The coil terminal on the other end side of the plurality of phases constituting the neutral point connection portion is,
Pulling in the circumferential direction from the coil located on both sides in the circumferential direction with respect to the coil located in the circumferential center of the coils of the plurality of phases toward the coil located in the circumferential center. A stator of a motor characterized by being rotated.

Images