JP5619046B2 - Rotating electric machine and method of manufacturing stator used therefor - Google Patents

Description

  The present invention relates to a rotating electrical machine applied to, for example, a vehicular electric motor mounted on an automobile, and a method of manufacturing a stator used therefor.

  In conventional motor stators, the windings wound around each tooth are connected to the neutral point on the closest side between the different phases and to the phase input on the side closest to the teeth to reduce the potential difference between the different phases. However, the dielectric strength is increased (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 9-23600

  In the conventional stator, the dielectric strength is increased by increasing the circumferential distance between the phase input connection ends where the potential difference between the windings wound around adjacent teeth is the largest. However, in the conventional stator, since the radial distance between the phase input connection ends is not considered, there is a problem that the slot cross-sectional area is not used effectively, the winding resistance is increased, and the loss is increased.

  This invention was made in order to solve the above-mentioned problems, and the external connection side terminal and the neutral point connection side terminal of adjacent concentrated winding coils are arranged close to each other to reduce the potential difference between the concentrated winding coils. An object of the present invention is to obtain a rotating electrical machine capable of reducing the resistance of a winding by effectively using a slot cross-sectional area and reducing a loss, and a method of manufacturing a stator used therefor.

  A rotating electrical machine according to the present invention includes a rotor, a stator having a stator core including a stator core and a plurality of concentrated winding coils wound around each tooth of the stator core, and the number of poles of the rotor and slots of the stator The ratio to the number is (6 ± 2) n: 6n (where n is an integer equal to or greater than 1), and the plurality of concentrated winding coils have a neutral point connection side terminal located on the inner diameter side and external connection The first concentrated coil wound around the tooth so that the side terminal is located on the outer diameter side, the neutral point connection side terminal is located on the outer diameter side, and the external connection side terminal is located on the inner diameter side The second concentrated winding coils wound around the teeth are alternately arranged in the circumferential direction.

  According to the present invention, the neutral point connection side terminals and the external connection terminals are alternately arranged on the inner diameter side of the first and second concentrated winding coils alternately arranged in the circumferential direction, and alternately arranged in the circumferential direction. Neutral point connection terminals and external connection terminals are alternately arranged on the outer diameter side of the first and second concentrated winding coils. Therefore, the neutral point connection side terminal and the external connection terminal are close to each other on the inner diameter side and the outer diameter side between the adjacent first and second concentrated winding coils. Therefore, the external connection terminals having the largest potential difference do not approach each other, the potential difference between the adjacent first and second concentrated winding coils is reduced, and the insulation resistance is improved. As a result, the gap between the adjacent first and second concentrated winding coils can be narrowed, the slot cross-sectional area can be effectively used, the resistance of the winding resistance can be reduced, and the loss can be reduced.

It is sectional drawing which shows the rotary electric machine which concerns on Embodiment 1 of this invention. It is a connection diagram of the stator coil in the rotary electric machine according to Embodiment 1 of the present invention. It is principal part sectional drawing explaining the structure of the stator coil in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view explaining the structure of the concentrated winding coil which comprises the stator coil in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure explaining the structure of the phase coil which comprises the stator coil in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure explaining the electric potential difference between the different phases in the three-phase alternating current winding comprised by the parallel coil of the number of parallels and the number of 1 in series. It is a connection diagram of a stator coil in a rotary electric machine according to Embodiment 2 of the present invention. It is a figure explaining the structure of the phase coil which comprises the stator coil in the rotary electric machine which concerns on Embodiment 2 of this invention. It is a figure explaining the electric potential difference between the different phases in the three-phase alternating current winding comprised by the phase coil of the parallel number 2 and the serial number 2. It is sectional drawing which shows the rotary electric machine which concerns on Embodiment 3 of this invention. It is a perspective view explaining the structure of the concentrated winding coil which comprises the stator coil in the rotary electric machine which concerns on Embodiment 4 of this invention. It is principal part sectional drawing explaining the structure of the stator coil in the rotary electric machine which concerns on Embodiment 5 of this invention. It is principal part sectional drawing explaining the structure of the stator coil in the rotary electric machine which concerns on Embodiment 6 of this invention. It is principal part sectional drawing explaining the structure of the stator coil in the rotary electric machine which concerns on Embodiment 7 of this invention. It is principal part sectional drawing explaining the structure of the stator coil in the rotary electric machine which concerns on Embodiment 8 of this invention. It is sectional drawing which shows the rotary electric machine which concerns on Embodiment 9 of this invention.

  Hereinafter, preferred embodiments of a rotating electrical machine according to the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a cross-sectional view showing a rotating electrical machine according to Embodiment 1 of the present invention, and FIG. 2 is a connection diagram of stator coils in the rotating electrical machine according to Embodiment 1 of the present invention.

  In FIG. 1, a rotating electrical machine 1 includes a shaft 4 rotatably supported on a frame (not shown), a rotor 2 fixed to the shaft 4 and rotatably disposed in the frame, and an annular stator core. 9 and a stator 8 having a stator coil 10 attached to the stator core 9, the stator core 9 being held by a frame, and being disposed so as to surround the rotor 2 via a predetermined gap.

  The rotor 2 is press-fitted into, for example, a cylindrical rotor core 3 produced by laminating and integrating electromagnetic steel plates punched into a predetermined shape, and a shaft insertion hole 6 formed so as to penetrate the axial center position of the rotor core 3. The shaft 4 is fixed, and the permanent magnet 5 is formed so as to penetrate the rotor core 3 and is inserted into each of the eight magnet insertion holes 7 arranged at an equiangular pitch on the same circumference.

  The stator core 9 is composed of 12 core pieces 11. That is, the core piece 11 is formed in a shape obtained by dividing the stator core 9 into 12 equal parts in the circumferential direction. The core piece 11 is produced, for example, by laminating and integrating a large number of electromagnetic steel sheets punched into the same shape, and has a diameter from the center in the circumferential direction of the arc-shaped core back portion 12 and the inner peripheral surface of the core back portion 12. And a tooth 13 formed in a tapered shape extending inward in the direction and having a circumferential width gradually narrowing from the outer diameter side toward the inner diameter side.

  The stator coil 10 includes twelve first and second concentrated winding coils 15 </ b> A and 15 </ b> B that are manufactured by winding a conductor wire around the teeth 13 of each core piece 11 a predetermined number of times. Here, the first and second concentrated winding coils 15 </ b> A and 15 </ b> B are configured by edgewise windings that are produced by winding a single layer around the teeth 13 vertically with the short side of the rectangular wire as the inner diameter side.

  Then, the core pieces 11 on which concentrated winding coils 15 arranged in an annular shape in the circumferential direction are butted against each other are pressed into an annular ring portion (not shown). The stator 8 is configured by being fixedly inserted or fixed in the ring portion by shrink fitting. The core pieces 11 are arranged in an annular shape by abutting the end surfaces in the circumferential direction of the core back portion 12 to constitute the stator core 9. Further, the core back portion 12 is connected in the circumferential direction to form a core back of the stator core 9, and a space formed by the core back and the adjacent teeth 13 forms a slot 14.

  In the stator 8, twelve first and second concentrated winding coils 15A and 15B are alternately arranged in the circumferential direction. The three phases energized in the first and second concentrated winding coils 15A and 15B are repeatedly arranged in the order of the U phase, the V phase, and the W phase counterclockwise as shown in FIG. As shown in FIG. 2, the stator coil 10 includes a U-phase coil 16U formed by connecting four U-phase first and second concentrated winding coils 15A and 15B in parallel, and four V-phase coils. V-phase coil 16V formed by connecting first and second concentrated winding coils 15A and 15B in parallel, and W-phase coil 16W formed by connecting four W-phase first and second concentrated winding coils 15A and 15B in parallel. And Y-connected. O is the neutral point of the stator coil 10.

  The rotating electrical machine 1 configured in this way operates as an 8-pole 12-slot three-phase motor by supplying U-phase, V-phase, and W-phase coils 16U, 16V, and 16W with three-phase alternating currents that are 120 degrees different from each other. .

  Next, a specific configuration of the stator coil 10 will be described with reference to FIGS. FIG. 3 is a cross-sectional view of the main part for explaining the configuration of the stator coil in the rotary electric machine according to Embodiment 1 of the present invention, and shows three concentrated winding coils of the adjacent U phase, V phase and W phase. ing. 4 is a perspective view for explaining the configuration of a concentrated winding coil constituting the stator coil in the rotary electric machine according to Embodiment 1 of the present invention, and FIG. 5 shows the configuration of the stator coil in the rotary electric machine according to Embodiment 1 of the present invention. It is a figure explaining the structure of the phase coil to do.

  In FIG. 3, the first concentrated coil 15 </ b> A serving as the U phase and the W phase has teeth 13 so that the neutral point connection side terminal 15 a is located on the inner diameter side and the external connection terminal 15 b is located on the outer diameter side. It is wound around. The second concentrated winding coil 15B serving as the V phase is wound around the tooth 13 so that the neutral point connection side terminal 15a is located on the outer diameter side and the external connection terminal 15b is located on the inner diameter side.

  As shown in FIG. 4A, the first concentrated winding coil 15 </ b> A is manufactured by winding one layer of a rectangular wire from the inner diameter side to the outer diameter side of the tooth 13 in the right screw direction. The winding start side of the flat wire becomes the neutral point connection side terminal 15a, and the winding end side becomes the external connection side terminal 15b. In addition, the neutral point connection side terminal 15 a and the external connection side terminal 15 b extend from one side in the circumferential direction of the tooth 13 to one side in the axial direction.

  Further, as shown in FIG. 4B, the second concentrated winding coil 15B is produced by winding one layer of a rectangular wire in the direction of the left screw from the outer diameter side to the inner diameter side of the tooth 13. Yes. That is, in the second concentrated winding coil 15B, the rectangular wire is wound around the tooth 13 in the reverse screw direction with respect to the first concentrated winding coil 15A. Also in the second concentrated coil 15B, the winding start side of the flat wire becomes the neutral point connection side terminal 15a, the winding end side becomes the external connection side terminal 15b, and the neutral point connection side terminal 15a and the external connection side terminal 15b are The teeth 13 extend from one side in the circumferential direction to one side in the axial direction.

  In FIG. 3, only three first and second concentrated winding coils 15A and 15B of the adjacent U phase, V phase and W phase are shown, but twelve first and second windings wound around the stator core 9 are shown. The two concentrated winding coils 15A and 15B are arranged so that the first concentrated winding coil 15A and the second concentrated winding coil 15B are alternately arranged in the circumferential direction. Accordingly, the first and second concentrated winding coils 15A and 15B are arranged in the circumferential direction so that the neutral point connection terminals 15a and the external connection side terminals 15b are alternately positioned on the inner diameter side.

  As shown in FIG. 5, U-phase coil 16U includes four first and second concentrated winding coils 15A. 15B is connected to the neutral point connection terminal 15a located on the inner diameter side ("in" in FIG. 5) and the neutral point connection side terminal 15a located on the outer diameter side ("out" in FIG. 5), The external connection terminal 15b located on the inner diameter side and the external connection terminal 15b located on the outer diameter side are connected and connected in parallel. Similarly, in the V-phase and W-phase coils 16V and 16W, four first and second concentrated winding coils 15A and 15B are respectively positioned on the neutral point connection terminal 15a located on the inner diameter side and on the outer diameter side. The external connection terminal 15b positioned on the inner diameter side and the external connection terminal 15b positioned on the outer diameter side are connected and connected in parallel. The U-phase, V-phase, and W-phase coils 16U, 16V, 16W have a parallel number of 4 and a series number of 1. Then, the U-phase, V-phase, and W-phase coils 16U, 16V, and 16W configured by connecting the four first and second concentrated winding coils 15A and 15B in parallel to each other are Y-connected, as shown in FIG. Thus, the stator coil 10 is configured.

Next, a method for manufacturing the stator 8 will be described.
First, the core piece 11 is produced by laminating and integrating a large number of electromagnetic steel sheets punched into the same shape. In addition, the first concentrated winding coil 15A is produced by winding a flat wire in the direction of the right screw to produce a first concentrated winding coil 15A, and the second concentrated winding coil 15B is produced by winding the flat wire in a direction of the left screw. The winding start end and the winding end end of the flat wire extend from both ends in the winding direction of the first and second concentrated winding coils 15A and 15B.
Next, as shown in FIGS. 4A and 4B, the core piece in which the first concentrated coil 15 </ b> A is wound around the tooth 13 so that the winding start end of the flat wire is located on the tip side of the tooth 13. 11 and the core piece 11 in which the second concentrated coil 15B is wound around the teeth 13 so that the winding start end of the flat wire is located on the core back part 12 side.
And the core piece 11 which wound the end surface of the circumferential direction of the core back part 12, and wound the 1st concentrated coil | winding coil 15A around the teeth 13, and the core piece 11 which wound the 2nd concentrated coil | winding coil 15B around the teeth 13 Are alternately arranged in a circular pattern. Then, the annular body is press-fitted and fixed into an annular ring body, or the annular body is inserted into the ring body and fixed by shrink fitting.
Next, predetermined connection is applied to the first concentrated winding coil 15A and the second concentrated winding coil 15B, and the stator 8 is manufactured.

  Next, the effect of the first embodiment will be described with reference to FIG. FIG. 6 is a diagram for explaining a potential difference between different phases in a three-phase AC winding composed of phase coils of 4 parallel and 1 serial.

  As can be seen from FIG. 6, when the voltage applied to the U-phase and V-phase coils 16U and 16V is 1 [V], the potential difference between the external connection side terminals of the U-phase and V-phase coils 16U and 16V is √3 [V ]. Therefore, when all of the concentrated winding coils are the first concentrated winding coil 15A, the neutral point connection side terminals 15a of the adjacent concentrated winding coils 15A are close to each other and the external connection side terminals 15b are close to each other. Thereby, the voltage difference between the neutral point connection side terminals 15a of the adjacent first concentrated winding coils 15A becomes zero, but the potential difference between the external connection side terminals 15b of the adjacent first concentrated winding coils 15A is √3 [ V]. That is, the potential difference between the adjacent first concentrated winding coils 15 is √3 [V].

  In the first embodiment, the first and second concentrated winding coils 15A and 15B are alternately arranged in the circumferential direction, and the neutral point connection terminals 15a and the external connection side terminals 15b are alternately positioned on the inner diameter side. Are arranged in the circumferential direction. Therefore, the neutral point connection side terminal 15a and the external connection side terminal 15b of the adjacent first and second concentrated winding coils 15A and 15B are close to each other, and the adjacent first and second concentrated winding coils 15A and 15B are adjacent to each other. The voltage difference between the neutral point connection side terminal 15a and the external connection side terminal 15b is 1 [V]. That is, the potential difference between the adjacent first and second concentrated winding coils 15A and 15B is 1 [V].

Thus, according to the first embodiment, the voltage difference between the adjacent first and second concentrated winding coils 15A and 15B can be reduced from √3 [V] to 1 [V], so that partial discharge is possible. The property is reduced, that is, the dielectric strength is increased. Accordingly, the insulating paper disposed between the different phases, that is, between the adjacent concentrated winding coils 15 can be thinned, so that the cost of the insulating paper can be reduced. Further, since the insulating paper can be made thin, it leads to an increase in the space for winding the conductor wire, so that the space factor can be increased and the loss due to energization can be suppressed.
Further, since the voltage difference between any adjacent first and second concentrated winding coils 15A and 15B is the same, the same insulating paper can be disposed between the adjacent first and second concentrated winding coils 15A and 15B, and the stator 8 is improved.

  The first and second concentrated winding coils 15A and 15B are arranged in the circumferential direction so that the neutral point connection terminals 15a and the external connection side terminals 15b are alternately positioned on the inner diameter side. Furthermore, the neutral point connection terminal 15a and the external connection side terminal 15b of the first and second concentrated winding coils 15A and 15B extend from the slots 14 on both sides in the circumferential direction of the teeth 13 to one side in the axial direction. Yes. Therefore, the distance between the neutral point connection terminal 15a and the external connection side terminal 15b is increased, the connection workability is improved, and the dielectric strength between the connection parts is improved.

  In the first embodiment, the stator core is divided into twelve core pieces. However, the stator core is not necessarily divided into twelve core pieces, and concentrated winding coils are used as teeth. For example, the stator core may be composed of a strip-shaped core body in which a part of the core back portion of 12 core pieces is connected by a thin-walled portion that can be bent. In this case, expand the core body linearly, wind concentrated winding coils around each tooth, then bend the thin wall portion to bend the core body into an annular shape, and insert and fix the annular core body into the ring body Thus, the stator is manufactured.

Embodiment 2. FIG.
FIG. 7 is a connection diagram of a stator coil in a rotary electric machine according to Embodiment 2 of the present invention, and FIG. FIG. 9 is a diagram for explaining a potential difference between different phases in a three-phase AC winding composed of two phase coils in parallel and two phase coils.

  7 and 8, U-phase coil 17U is a coil formed by connecting two first concentrated winding coils 15A in series by connecting neutral point connection terminal 15a and external connection terminal 15b. And a coil formed by connecting the two second concentrated winding coils 15B to the neutral point connection terminal 15a and the external connection terminal 15b and connecting them in series. . Similarly, the V-phase and W-phase coils 17V and 17W are each configured by connecting two first concentrated winding coils 15A in series by connecting a neutral point connection terminal 15a and an external connection terminal 15b. The coil formed by connecting the neutral coil connecting terminal 15a and the external connecting terminal 15b in series with the two second concentrated winding coils 15B and connecting them in series is connected in parallel. Composed. The U-phase, V-phase, and W-phase coils 17U, 17V, and 17W have two parallel numbers and two serial numbers. Then, the U-phase, V-phase, and W-phase coils 17U, 17V, and 17W configured in this way are Y-connected to form a stator coil 10A.

  In the second embodiment, the U-phase, V-phase, and W-phase coils 17U, 17V, and 17W are configured by connecting four first and second concentrated winding coils 15A and 15B in parallel number 2 and series number 2. Except for these points, the configuration is the same as in the first embodiment.

  Next, the effect of the second embodiment will be described with reference to FIG.

  As can be seen from FIG. 9, when the voltage applied to the U-phase and V-phase coils 17U and 17V is 1 [V], the potential difference between the external connection terminals 18 and 19 of the U-phase and V-phase coils 17U and 17V is √3. [V], the potential difference between the intermediate point 21 of the V-phase coil 17V connected in series and the external connection terminal 18 of the V-phase coil 17U is (√7) / 2 [V], the U-phase and V-phase coils The potential difference between the intermediate points 20 and 21 of the 17U and 17V series-connected coils is (√3) / 2 [V].

  In the second embodiment, since the first and second concentrated winding coils 15A and 15B are alternately arranged in the circumferential direction, the neutral point connection side terminals 15a of the adjacent first and second concentrated winding coils 15A and 15B are adjacent to each other. And the external connection side terminal 15b are close to each other, and the voltage difference between the neutral point connection side terminal 15a and the external connection side terminal 15b of the adjacent first and second concentrated winding coils 15A and 15B is maximum (√ 7) / 2 [V].

  As described above, also in the second embodiment, the voltage difference between the adjacent first and second concentrated winding coils 15A and 15B can be reduced from at least √3 [V] to (√7) / 2 [V]. The possibility of partial discharge is reduced and the dielectric strength is increased. Therefore, since the insulating paper disposed between the adjacent concentrated winding coils 15 can be thinned, the cost of the insulating paper can be reduced. Further, since the insulating paper can be made thin, it leads to an increase in the space for winding the conductor wire, so that the space factor can be increased and the loss due to energization can be suppressed.

  Here, when the stator coil is constituted by concentrated winding coils, the parallel number of phase coils is a divisor of the greatest common divisor of the number of poles and the number of teeth. That is, in Embodiments 1 and 2, since there are 8 poles and 12 slots, the greatest common divisor of the number of poles and the number of teeth is 4, and the parallel number of phase coils is 4, 2, 1. As can be seen from the first and second embodiments, the concentrated winding coil is formed by separating the neutral point connection terminal and the external connection side terminal 15b into the inner diameter side and the outer diameter side, and the neutral point. When the connection terminals 15a and the external connection side terminals 15b are arranged in the circumferential direction so as to be alternately positioned on the inner diameter side, the concentrated winding is formed by connecting four concentrated winding coils in series to form a phase coil. It can be seen that the potential difference between the adjacent concentrated winding coils can be reduced by configuring the phase coils by connecting the coils in parallel. Further, it can be seen that as the number of parallel phase coils increases, the effect of reducing the potential difference between the neutral point connection terminal and the external connection side terminal of the adjacent concentrated winding coils increases.

  In the first and second embodiments, the description is given using the 8-pole 12-slot rotary electric machine. However, the number of magnetic poles and the number of slots of the rotary electric machine is not limited to 8 poles and 12 slots. And the pole slot ratio may be 4n: 6n (where n is an integer equal to or greater than 1).

Embodiment 3 FIG.
FIG. 10 is a sectional view showing a rotary electric machine according to Embodiment 3 of the present invention.

  In FIG. 10, a rotating electrical machine 1A includes a shaft 4 rotatably supported by a frame (not shown), a rotor 30 fixed to the shaft 4 and rotatably disposed in the frame, and an annular stator core. 9 and a stator coil 10A mounted on the stator core 9, the stator core 9 being held by the frame, and disposed so as to surround the rotor 30 via a predetermined gap.

  The rotor 30 is press-fitted into, for example, a cylindrical rotor core 31 made by laminating and integrating electromagnetic steel plates punched into a predetermined shape, and a shaft insertion hole 32 formed so as to penetrate the axial center position of the rotor core 31. A fixed shaft 33 and permanent magnets 34 that are formed so as to penetrate the rotor core 31 and are respectively inserted into 16 magnet insertion holes 35 arranged at an equiangular pitch on the same circumference. .

  In the stator 8A, 12 first and second concentrated winding coils 15A and 15B are alternately arranged in the circumferential direction. That is, the neutral point connection terminals 15a and the external connection side terminals 15b are arranged in the circumferential direction so as to be alternately located on the inner diameter side. The three phases energized to the first and second concentrated winding coils 15A and 15B are repeatedly arranged in the order of the U phase, the V phase, and the W phase in the clockwise direction.

  Similarly to the second embodiment, stator coil 10A is configured by Y-connecting U-phase coil 17U, V-phase coil 17V, and W-phase coil 17W. As shown in FIGS. 7 and 8, the U-phase coil 17U has two first concentrated winding coils 15A connected in series by connecting a neutral point connection terminal 15a and an external connection terminal 15b. The coil formed by connecting the two second concentrated winding coils 15B to the neutral point connection terminal 15a and the external connection terminal 15b and connecting them in series is connected in parallel. Configured. Similarly, the V-phase and W-phase coils 17V and 17W are each configured by connecting two first concentrated winding coils 15A in series by connecting a neutral point connection terminal 15a and an external connection terminal 15b. The coil formed by connecting the neutral coil connecting terminal 15a and the external connecting terminal 15b in series with the two second concentrated winding coils 15B and connecting them in series is connected in parallel. Composed. The U-phase, V-phase, and W-phase coils 17U, 17V, and 17W have two parallel numbers and two serial numbers.

  The third embodiment is configured in the same manner as in the second embodiment except that the rotor 30 has 16 poles.

  The rotating electrical machine 1A configured as described above operates as a three-phase motor having 16 poles and 12 slots by energizing U-phase, V-phase, and W-phase coils 17U, 17V, and 17W with three-phase alternating currents that are 120 degrees different from each other. .

  Also in the third embodiment, the first and second concentrated winding coils 15A and 15B are arranged in the circumferential direction so that the neutral point connection terminals 15a and the external connection side terminals 15b are alternately positioned on the inner diameter side. , U-phase, V-phase, and W-phase coils 17U, 17V, and 17W are configured by connecting four first and second concentrated winding coils 15A and 15B to two in parallel and two in series, respectively. Therefore, the third embodiment has the same effect as the second embodiment.

  In the third embodiment, the explanation is made using a 16-pole 12-slot rotary electric machine. However, the number of magnetic poles and the number of slots of the rotary electric machine is not limited to 16 poles and 12 slots. The ratio may be 8: 6, that is, the pole slot ratio may be 8n: 6n (where n is an integer of 1 or more).

Embodiment 4 FIG.
FIG. 11 is a perspective view illustrating the configuration of a concentrated winding coil that constitutes a stator coil in a rotary electric machine according to Embodiment 4 of the present invention.

  In FIG. 11, the first concentrated winding coil 15 </ b> C inserts the winding start of a flat wire from one side in the axial direction to one side in the circumferential direction of the teeth 13, and then turns right-handed from the inner diameter side to the outer diameter side of the teeth 13. One layer is wound in the direction, and the winding end of the rectangular wire is wound by the width of the teeth 13 and then bent at a substantially right angle so as to extend from one circumferential direction side of the teeth 13 to one axial direction side. Accordingly, the neutral point connection side terminal 15a and the external connection side terminal 15b of the first concentrated winding coil 15A both extend from the circumferentially one side slot 14 of the tooth 13 to one axial direction side.

  Although the second concentrated winding coil is not shown, the winding start of the flat wire extends from one side in the axial direction to the inlet of the slot 14 on the other side in the circumferential direction of the teeth 13, where the flat wire is bent at a substantially right angle to form the teeth 13. Is wound around one end surface in the circumferential direction to one side in the circumferential direction, and then wound one layer in the direction of the left screw from the outer diameter side to the inner diameter side of the tooth 13, and the end of the flat wire is extended to one side in the axial direction. I am letting it out. As a result, the neutral point connection side terminal 15a and the external connection side terminal 15b of the second concentrated winding coil 15B both extend from the slot 14 on the other circumferential side of the tooth 13 to one side in the axial direction.

  In the fourth embodiment, the above-described implementation is performed except that the first concentrated winding coil 15C and the second concentrated winding coil are used instead of the first concentrated winding coil 15A and the second concentrated winding coil 15B. It is comprised similarly to the form 1 of.

  According to the fourth embodiment, the neutral point connection side terminal 15a and the external connection side terminal 15b of the first concentrated coil 15C are both moved from the slot 14 on one side in the circumferential direction of the tooth 13 to one side in the axial direction. Since it extends, the length of the conductor wire of the first concentrated winding coil 15C is increased by the width of the tooth 13, and the magnetomotive force of the rotating electrical machine can be increased. In addition, since the neutral point connection side terminal 15a and the external connection side terminal 15b of the second concentrated winding coil both extend from the circumferentially other side slot 14 of the tooth 13 to the axial direction side, the second The length of the conductor wire of the concentrated winding coil is increased by the width of the tooth 13, and the magnetomotive force of the rotating electrical machine can be increased.

Embodiment 5. FIG.
FIG. 12 is a cross-sectional view of the main part for explaining the configuration of the stator coil in the rotary electric machine according to Embodiment 5 of the present invention, and shows three concentrated winding coils of the adjacent U phase, V phase and W phase. ing.

  In FIG. 12, the first concentrated coil 40A is produced by winding one layer of a conductor wire having a circular cross section from the inner diameter side to the outer diameter side of the tooth 13 in the direction of the right screw, and on the winding start side of the conductor wire. A certain neutral point connection side terminal 40a is located on the inner diameter side, and an external connection side terminal 40b that is the winding end side is located on the outer diameter side. The second concentrated winding coil 40B is produced by winding a conductor wire having a circular cross section in one layer in the direction of the left screw from the outer diameter side to the inner diameter side of the tooth 13, and is a neutral point on the winding start side of the conductor wire. The connection side terminal 40a is located on the outer diameter side, and the external connection side terminal 40b that is the winding end side is located on the inner diameter side.

The first concentrated winding coil 40A and the second concentrated winding coil 40B are arranged on the stator core so as to be alternately arranged in the circumferential direction. Thereby, the neutral point connection terminals 40a and the external connection side terminals 40b are arranged in the circumferential direction so as to be alternately positioned on the inner diameter side.
The fifth embodiment is the same as the first embodiment except that the first and second concentrated winding coils 40A and 40B are used instead of the first and second concentrated winding coils 15A and 15B. It is configured.

Therefore, the fifth embodiment has the same effect as the first embodiment.
According to the fifth embodiment, since the conductor wire having a circular cross section is used, the first and second concentrated winding coils 40A and 40B can be easily manufactured, and the cost can be reduced.

Embodiment 6 FIG.
FIG. 13 is a cross-sectional view of the main part for explaining the configuration of the stator coil in the rotary electric machine according to Embodiment 6 of the present invention, and shows three concentrated winding coils of the adjacent U phase, V phase and W phase. ing.

  In FIG. 13, the first concentrated coil 41A is formed by winding a conductor wire having a circular cross section from the inner diameter side of the tooth 13 toward the outer diameter side in the direction of the right-hand screw to form the first layer, and then folding back to the outer diameter. Winding from the inner side toward the inner diameter side to form the second layer, and then folding back and winding from the inner diameter side toward the outer diameter side to form the third layer, which is the winding start side of the conductor wire The neutral point connection side terminal 41a is located on the inner diameter side, and the external connection side terminal 41b on the winding end side is located on the outer diameter side. The second concentrated winding coil 41B is formed by winding a conductor wire having a circular cross section in the direction of the left screw from the outer diameter side to the inner diameter side of the tooth 13 to form a first layer, and then folding back to form an outer diameter side from the inner diameter side. A second layer is formed by winding the wire toward the outer side, and then it is folded back and wound from the outer diameter side toward the inner diameter side to form the third layer. The side terminal 41a is located on the outer diameter side, and the external connection side terminal 41b on the winding end side is located on the inner diameter side.

The first concentrated winding coil 41A and the second concentrated winding coil 41B are arranged on the stator core so as to be alternately arranged in the circumferential direction. Accordingly, the neutral point connection terminals 41a and the external connection side terminals 41b are arranged in the circumferential direction so as to be alternately positioned on the inner diameter side.
The sixth embodiment is the same as the fifth embodiment except that the first and second concentrated winding coils 41A and 41B are used instead of the first and second concentrated winding coils 40A and 40B. It is configured.

Therefore, the sixth embodiment has the same effects as the fifth embodiment.
According to the sixth embodiment, since the conductor wire having a circular cross section is wound in multiple layers by aligned winding, the space factor of the first and second concentrated winding coils 41A and 41B can be increased.

Embodiment 7 FIG.
FIG. 14 is a cross-sectional view of a main part for explaining the configuration of a stator coil in a rotary electric machine according to Embodiment 7 of the present invention, and shows three concentrated winding coils of an adjacent U phase, V phase and W phase. ing.

  In FIG. 14, the core piece 11 </ b> A extends radially inward from the circumferential center of the arc-shaped core back portion 12 and the inner peripheral surface of the core back portion 12, and the circumferential width is changed from the outer diameter side to the inner diameter. Teeth 13A formed uniformly toward the side. The first concentrated winding coil 42A is produced by winding a rectangular wire one layer in the direction of the right screw from the inner diameter side to the outer diameter side of the tooth 13A, and is a neutral point connection side terminal that is the winding start side of the conductor wire 42a is located on the inner diameter side, and the external connection side terminal 42b that is the winding end side is located on the outer diameter side. The second concentrated winding coil 42B is produced by winding a flat wire in one layer in the direction of the left screw from the outer diameter side to the inner diameter side of the tooth 13A, and is a neutral point connection side terminal that is the winding start side of the conductor wire 42a is located on the outer diameter side, and the external connection side terminal 42b, which is the winding end side, is located on the inner diameter side.

The first concentrated winding coil 42A and the second concentrated winding coil 42B are arranged on the stator core so as to be alternately arranged in the circumferential direction. Thereby, the neutral point connection terminals 42a and the external connection side terminals 42b are arranged in the circumferential direction so as to be alternately positioned on the inner diameter side.
In the seventh embodiment, the core piece 11A and the first and second concentrated winding coils 42A and 42B are used in place of the core piece 11 and the first and second concentrated winding coils 15A and 15B. The configuration is the same as in the first embodiment.

Therefore, the seventh embodiment also has the same effect as the first embodiment.
According to the seventh embodiment, since the circumferential width of the teeth 13A of the core piece 11A is constant in the radial direction, the slot cross-sectional area becomes larger than when the teeth 11 having the tapered teeth 13 are used. . Thereby, the cross-sectional area of the conductor wire of 1st and 2nd concentrated winding coil 42A, 42B can be enlarged, and the loss by electricity supply of 1st and 2nd concentrated winding coil 42A, 42B can be reduced.

Embodiment 8 FIG.
FIG. 15 is a cross-sectional view of a main part for explaining the configuration of a stator coil in a rotary electric machine according to Embodiment 8 of the present invention, and shows three concentrated winding coils of an adjacent U phase, V phase and W phase. ing.

  In FIG. 15, the first concentrated winding coil 43A forms a first layer by winding a conductor wire having a circular cross section from the inner diameter side of the tooth 13A toward the outer diameter side in the direction of the right screw, and then folded back to the outer diameter. Winding from the inner side toward the inner diameter side to form the second layer, and then folding back and winding from the inner diameter side toward the outer diameter side to form the third layer, which is the winding start side of the conductor wire The neutral point connection side terminal 43a is located on the inner diameter side, and the external connection side terminal 43b on the winding end side is located on the outer diameter side. The second concentrated coil 43B is formed by winding a conductor wire having a circular cross section in the direction of the left screw from the outer diameter side of the tooth 13A toward the inner diameter side, and then folding back to form an outer diameter side from the inner diameter side. A second layer is formed by winding the wire toward the outer side, and then it is folded back and wound from the outer diameter side toward the inner diameter side to form the third layer. The side terminal 43a is located on the outer diameter side, and the external connection side terminal 43b that is the winding end side is located on the inner diameter side.

The first concentrated winding coil 43A and the second concentrated winding coil 43B are arranged on the stator core so as to be alternately arranged in the circumferential direction. Thereby, the neutral point connection terminals 43a and the external connection side terminals 43b are arranged in the circumferential direction so as to be alternately positioned on the inner diameter side.
In the eighth embodiment, the core piece 11A and the first and second concentrated winding coils 43A and 43B are used in place of the core piece 11 and the first and second concentrated winding coils 40A and 40B. The configuration is the same as in the fifth embodiment.

Therefore, the eighth embodiment has the same effect as the fifth embodiment.
According to the eighth embodiment, since the circumferential width of the teeth 13A of the core piece 11A is constant in the radial direction, the slot cross-sectional area becomes larger than when the teeth 11 having the tapered teeth 13 are used. . In addition, a conductor wire having a circular cross section is wound in multiple layers by aligned winding. Therefore, the space factor of the first and second concentrated winding coils 43A and 43B can be increased, and loss due to energization of the first and second concentrated winding coils 43A and 43B can be reduced.

Embodiment 9 FIG.
FIG. 16 is a sectional view showing a rotary electric machine according to Embodiment 9 of the present invention.

  In FIG. 16, a rotating electrical machine 50 includes a rotor 51 fixed to a shaft (not shown) rotatably supported by a frame (not shown) and rotatably arranged in the frame, and an annular stator core. 9 and a stator coil 10 mounted on the stator core 9, the stator core 9 being held in a frame, and being disposed in the rotor 2 through a predetermined gap.

  The rotor 51 is, for example, a cylindrical rotor core 52 manufactured by laminating and integrating magnetic steel sheets punched into a predetermined shape, and is formed so as to penetrate the rotor core 52, and arranged at an equiangular pitch on the same circumference. Permanent magnets 53 inserted into the respective eight magnet insertion holes 54.

  The stator 55 includes a cylindrical core back 57, a stator core 56 having twelve teeth 58 that extend radially outward from the outer circumferential surface of the core back 57 and are arranged at equiangular pitches in the circumferential direction, and the teeth 58 includes a stator coil 60 having first and second concentrated winding coils 60A and 60B which are produced by winding a conductor wire a predetermined number of times. A space formed by the core back 57 and the adjacent teeth 58 constitutes a slot 59.

  Twelve first and second concentrated winding coils 60A and 60B are alternately arranged in the circumferential direction, and are configured in the same manner as in the first embodiment.

The first concentrated coil 60A is produced by winding a conductor wire having a circular cross section in one layer from the inner diameter side to the outer diameter side of the tooth 58 in the right-handed direction. The second concentrated winding coil 60B is manufactured by winding a conductor wire having a circular cross section in one layer in the direction of the left screw from the outer diameter side to the inner diameter side of the tooth 58. That is, in the second concentrated winding coil 60B, the conductor wire is wound around the tooth 58 in the reverse screw direction with respect to the first concentrated winding coil 60A.
In the first and second concentrated winding coils 60A and 60B, the winding start side of the conductor wire is a neutral point connection side terminal, the winding end side of the conductor wire is an external connection side terminal, and the neutral point connection side terminal and the external connection side terminal However, it extends from each of the both sides in the circumferential direction of the teeth 58 to one side in the axial direction.

  The three phases energized in the first and second concentrated winding coils 60A and 60B are repeatedly arranged in the order of the U phase, the V phase, and the W phase counterclockwise. The stator coil 60 includes a U-phase coil formed by connecting four U-phase first and second concentrated winding coils 60A and 60B in parallel, and four V-phase first and second concentrated winding coils 60A. , 60B are connected in parallel, and a W-phase coil formed by connecting four W-phase first and second concentrated winding coils 60A, 60B in parallel is Y-connected.

The rotating electrical machine 50 configured in this manner operates as a three-phase motor having 8 poles and 12 slots by supplying a U-phase, V-phase, and W-phase coil with three-phase alternating currents having different phases by 120 degrees.
The ninth embodiment is configured in the same manner as the first embodiment except that it is an outer rotor type rotating electrical machine.

  Also in the ninth embodiment, the first and second concentrated winding coils 60A and 60B are alternately arranged in the circumferential direction, and the neutral point connection terminals and the external connection side terminals are alternately positioned on the inner diameter side. Are arranged in the circumferential direction. Therefore, since the voltage difference between the adjacent first and second concentrated winding coils 60A and 60B can be reduced, the possibility of partial discharge is reduced, that is, the dielectric strength is increased.

  Further, since the voltage difference between any adjacent first and second concentrated winding coils 60A and 60B is the same, the same insulating paper can be arranged between the adjacent first and second concentrated winding coils 60A and 60B, and the stator The assembly of 55 is improved.

  The first and second concentrated winding coils 60A and 60B are arranged in the circumferential direction so that the neutral point connection terminals and the external connection side terminals are alternately positioned on the inner diameter side. Further, the neutral point connection terminals and the external connection side terminals of the first and second concentrated winding coils 60 </ b> A and 60 </ b> B extend from the slots 59 on both sides in the circumferential direction of the tooth 58 to one side in the axial direction. Therefore, the distance between the neutral point connection terminal and the external connection side terminal is increased, the connection workability is improved, and the dielectric strength between the connection parts is improved.

  1, 1A, 50 Rotating electrical machine, 2, 30, 51 Rotor, 8, 8A, 55 Stator, 9, 56 Stator core, 10, 10A, 60 Stator coil, 11, 11A Core piece, 12 Core back part, 13, 13A, 58 teeth, 14, 59 slots, 15A, 15C, 40A, 41A, 42, 43A, 60A first concentrated winding coil, 15B, 40B, 41B, 42B, 43B, 60B second concentrated winding coil, 15a, 40a, 41a, 42a, 43a Neutral point connection side terminal, 15b, 40b, 41b, 42b, 43b External connection side terminal, 16U, 17U U phase coil, 16V, 17V V phase coil, 16W, 17W W phase coil.

Claims (8)

A rotor,
A stator core, and a stator having a stator coil composed of a plurality of concentrated winding coils wound around each tooth of the stator core,
The ratio between the number of poles of the rotor and the number of slots of the stator is (6 ± 2) n: 6n (where n is an integer of 1 or more),
The plurality of concentrated winding coils includes a first concentrated winding coil wound around the teeth such that the neutral point connection side terminal is positioned on the inner diameter side and the external connection side terminal is positioned on the outer diameter side, The second concentrated winding coil wound around the teeth so that the point connection side terminal is located on the outer diameter side and the external connection side terminal is located on the inner diameter side is alternately arranged in the circumferential direction. A rotating electric machine characterized by The stator coil includes a plurality of phase coils configured by connecting the plurality of concentrated winding coils,
When the divisor of the greatest common divisor between the number of poles of the rotor and the number of slots in the stator is w (where w is an integer of 2 or more), each of the plurality of phase coils is arranged in parallel with the concentrated winding coil. The rotating electrical machine according to claim 1, wherein the rotating electrical machine is configured by connecting the numbers as w.   The first concentrated winding coil is configured by winding a conductor wire around the tooth in one layer from the inner diameter side to the outer diameter side, and the second concentrated winding coil is configured such that the conductor wire is wound from the outer diameter side of the tooth. The rotating electrical machine according to claim 1 or 2, wherein the electric rotating machine is configured by winding in one layer in the direction of the first concentrated winding coil and the reverse screw toward the inner diameter side.   The rotating electrical machine according to any one of claims 1 to 3, wherein the teeth are formed in a tapered shape in which a circumferential width gradually decreases from an outer diameter side toward an inner diameter side.   Each of the plurality of concentrated winding coils is configured such that the external connection side terminal and the neutral point connection side terminal are axially one side from slots on both sides in the circumferential direction of the teeth around which the concentrated winding coil is wound. The rotating electrical machine according to any one of claims 1 to 4, wherein the rotating electrical machine is extended.   Each of the plurality of concentrated winding coils is configured such that the external connection side terminal and the neutral point connection side terminal are on one side in the axial direction from a slot on one side in the circumferential direction of the tooth around which the concentrated winding coil is wound. The rotating electrical machine according to any one of claims 1 to 4, wherein the rotating electrical machine extends in a vertical direction. A method of manufacturing a stator for a rotating electrical machine according to any one of claims 1 to 6,
Winding a conductor wire in a predetermined screw direction, and producing a first concentrated winding coil in which a winding start end and a winding end end of the conductor wire extend from both ends in the winding direction;
A conductor wire is wound around the first concentrated coil in the direction of a reverse screw to produce a second concentrated coil in which the winding start end and winding end of the conductor wire extend from both ends in the winding direction. And a process of
The first concentrated winding coil and the second concentrated winding coil are alternately arranged in the circumferential direction, and the winding start end of the conductor wire of the first concentrated winding coil is located on the distal end side of the teeth of the stator core, Winding the first concentrated winding coil and the second concentrated winding coil around each of the teeth of the stator core so that the winding start end of the conductor wire of the second concentrated winding coil is located on the root side of the teeth of the stator core. And a process of
A method for manufacturing a stator, comprising: A step of producing a core piece having an arc-shaped core back portion and the teeth extending radially inward from an inner peripheral surface of the core back portion, and having a shape obtained by dividing the stator core by the number of the teeth. Prepared,
In the step of winding the first concentrated winding coil 15 and the second concentrated winding coil around each of the teeth of the stator core, the core piece in which the first concentrated winding coil is wound around the teeth, and the first 8. The core pieces, in which two concentrated winding coils are wound around the teeth, are arranged side by side alternately in an annular shape by abutting the circumferential side surfaces of the core back part. Stator manufacturing method.

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