JP6210705B2 - Rotating electric machine and stator used therefor - Google Patents

Description

  The present invention relates to a rotating electrical machine such as an electric motor or a generator and a stator used therefor, and more particularly to an insulating structure of a stator winding.

  In a conventional rotating electrical machine, an insulating tape is wound around the entire coil end portion of a coil conductor produced by winding an insulation-coated conductor wire a plurality of times to ensure insulation between phases of the stator coil (for example, , See Patent Document 1).

JP 2008-236924 A

In this type of rotating electric machine, coil end portions of different phases that are adjacent in the radial direction intersect with each other. Therefore, in order to ensure insulation between the phases, it is necessary to separate the coil end portions at the intersecting portion.
However, in the conventional rotating electric machine, since the insulating tape is wound around the region where the insulation between the phases of the coil end portions is not necessary, the insulating portions of the coil end portions are partially excessively thick, and the stator coil There was a problem that the diameter of the coil end was increased. Furthermore, in the coil conductor, since the entire coil end portion has a thickness equivalent to the entire radial thickness of the straight portion inserted into the slot, the bending radius at the top of the coil end portion is increased, There is also a problem that the coil ends where the coil end portions of different coil conductors overlap in the radial direction swell in the radial direction, and the coil end of the stator coil increases in diameter.

  The present invention has been made in order to solve the above-described problem. An insulating tape for ensuring insulation between phases is partially wound around a coil end portion, and the radial thickness of the coil end portion is set to the radial thickness of the linear portion. An object of the present invention is to obtain a rotating electrical machine that can be made thinner and suppress the increase in the diameter of a coil end of a stator winding, and a stator used therefor.

In the stator according to the present invention, the stator iron core in which the teeth are arranged in the circumferential direction and the conductor wire coated with insulation are wound a plurality of times, and the ends of the pair of linear portions are connected to each other by the coil end portions. A stator winding having a plurality of coil bodies mounted on the stator core by inserting the pair of linear portions into a pair of slots located on both sides of a plurality of continuous teeth. It has. The coil body is formed such that a radial thickness of the coil end portion is thinner than a radial thickness of the linear portion, and the plurality of coil bodies are formed of both inclined portions extending from the root portion to the top of the coil end portion. each are arranged so as to intersect with the inclined portion of said coil body next to different phases in the radial direction, the insulating tape, the both inclined to avoid the top portion to the coil end portion of the coil body It is wound in each of the parts, each intersection of the inclined portion adjacent Riau different phases in the radial direction, only the insulating tape is wound on one of the inclined portion is disposed.

According to this invention, the coil body is formed such that the radial thickness of the coil end portion is thinner than the radial thickness of the straight portion inserted into the slot. Therefore, the bending radius of the coil end portion is reduced, and an increase in the diameter of the coil end due to the overlapping of the coil end portions in the radial direction can be suppressed.
In addition, since the insulating tape is wound around the coil end portion of the coil body so as to avoid the top, and is arranged so as to intersect the coil end portion of the coil body of a different phase adjacent in the radial direction, the insulating tape is It arrange | positions between the coil end parts of a different phase, and the insulation between phases is ensured. And since the insulation tape is not wound around the top part which does not require the insulation between the phases of a coil end part, the enlargement of the diameter of a coil end resulting from partial insulation thickness becoming excessive is suppressed.

It is a half sectional view which shows the rotary electric machine which concerns on Embodiment 1 of this invention. It is a cross-sectional view which shows the stator in the rotary electric machine which concerns on Embodiment 1 of this invention. It is the expanded view which cut and opened the stator in the rotary electric machine which concerns on Embodiment 1 of this invention, and was extended to one plane. It is a top view which shows the coil body which comprises the stator winding | coil of the stator in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a front view which shows the coil body which comprises the stator winding | coil of the stator in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a front view which shows the coil body which comprises the stator winding | coil of the stator in the rotary electric machine which concerns on Embodiment 2 of this invention. It is the expanded view which opened and opened the stator in the rotary electric machine which concerns on Embodiment 2 of this invention, and was extended to one plane. It is a front view which shows the coil body which comprises the stator winding | coil of a stator in the rotary electric machine which concerns on Embodiment 3 of this invention. It is the expanded view which cut and opened the stator in the rotary electric machine which concerns on Embodiment 3 of this invention, and was extended to one plane.

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

Embodiment 1 FIG.
FIG. 1 is a half sectional view showing a rotating electrical machine according to Embodiment 1 of the present invention, and FIG. 2 is a transverse sectional view showing a stator in the rotating electrical machine according to Embodiment 1 of the present invention. 3 is a developed view in which the stator in the rotary electric machine according to Embodiment 1 of the present invention is cut open and extended to one plane, and FIG. 3A is a view of the stator as viewed from one side in the axial direction. FIG. 3B is a view of the stator as viewed from the inner diameter side. 4 is a top view showing a coil body constituting the stator winding of the stator in the rotary electric machine according to Embodiment 1 of the present invention, and FIG. 5 is a view of the stator in the rotary electric machine according to Embodiment 1 of the present invention. It is a front view which shows the coil body which comprises a stator winding | coil. The transverse cross-sectional view is a cross-sectional view showing a cross section perpendicular to the axis of the stator.

  In FIG. 1, a rotating electric machine 100 includes a housing 1 having a bottomed cylindrical frame 2 and an end plate 3 that closes an opening of the frame 2, and an armature that is fixed to the cylindrical portion of the frame 2 in an internally fitted state. The stator 10 is fixed to a rotating shaft 6 rotatably supported on the bottom of the frame 2 and the end plate 3 via a bearing 4, and is rotatably disposed on the inner peripheral side of the stator 10. And a child 5.

  The rotor 5 is fixed to a rotor shaft 6 inserted through the shaft center position, and the rotor core 5 is embedded in the outer peripheral surface side of the rotor core 7 and arranged at an equal pitch in the circumferential direction to constitute a magnetic pole. A permanent magnet type rotor including a permanent magnet 8. The rotor 5 is not limited to a permanent magnet type rotor, and a squirrel-cage rotor in which a non-insulated rotor conductor is housed in a slot of a rotor core and both sides are short-circuited by a short-circuit ring, or an insulated conductor. You may use the winding-type rotor which attached the wire to the slot of the rotor core.

  Next, the configuration of the stator 10 will be described with reference to FIGS. 1 to 5.

  As shown in FIGS. 1 and 2, the stator 10 includes an annular stator core 11 and a stator winding 15 attached to the stator core 11. Here, for convenience of explanation, the number of poles of the rotor 5 is 8, the number of slots of the stator core 11 is 24, and the stator winding 15 is a three-phase winding. That is, the slots 14 are formed in the stator core 11 at a rate of one per pole per phase.

  The stator core 11 is produced, for example, by laminating and integrating a plurality of electromagnetic steel sheets punched into a fixed shape, and extends inward in the radial direction from the inner peripheral surface of the yoke 12 and the yoke 12, respectively. And teeth 13 arranged at equal pitches in the circumferential direction. A space formed between the teeth 13 becomes a slot 14. The stator winding 15 includes a coil body 16.

As shown in FIGS. 4 and 5, the coil body 16 is formed in an annular shape including a first straight portion 16 b, a first coil end portion 16 c, a second straight portion 16 d, and a second coil end portion 16 e. The first and second coil end portions 16c, 16e thickness t2 of the first and second straight portions 16b, have I be about half of the 16d of the thickness t1. Further, a crank portion 17 is formed at the tops of the first and second coil end portions 16c, 16e, and the first straight portion 16b side and the second straight portion 16d of the first and second coil end portions 16c, 16e. The side is displaced by t2 in the thickness direction. Here, the thickness of the first straight portion 16b, the first coil end portion 16c, the second straight portion 16d, and the second coil end portion 16e is the radial direction when the coil body 16 is attached to the stator core 11. It means the thickness in the slot depth direction.

  For example, the coil body 16 is formed by winding a conductor wire 20 made of a thin wire such as a continuous copper wire or an aluminum wire, which is insulation-coated with an enamel resin and has no connection portion, a plurality of times, so that the first straight portion 16b and the second linear portion 16b Both ends of the straight line portion 16d are formed in an annular shape connected by the first coil end portion 16c and the second coil end portion 16e, respectively, and then the first and second coil end portions 16c and 16e are formed into flat shapes, and the first The crank part 17 is formed by molding the tops of the first and second coil end parts 16c and 16e. Then, the winding end 16a that is the start of winding of the conductor wire 20 extends from one side in the length direction of the first straight portion 16b, and the winding end 16f that is the end of winding of the conductor wire 20 is the second straight portion 16d. It extends from one side of the length direction.

  The insulating tape 18 is wound around the inclined portion between the root portions of the first and second coil end portions 16c and 16e of the coil body 16 and the crank portion 17 a plurality of times so as to be orthogonal to the length direction of the inclined portion. It is installed by turning. As the material of the insulating tape 18, a material having high heat resistance and excellent insulating properties such as polyamide, polyimide, polytetrafluoroethylene, mica, polyethyl ether ketone, or the like is used. The insulating film of the conductor wire 20 is set to a thickness that does not cause partial discharge due to a potential difference generated between the conductor wires 20. The winding portion of the insulating tape 18 is set to a thickness at which partial discharge does not occur due to a potential difference generated between phases.

In the coil body 16 manufactured in this way, the first straight portion 16b and the second straight portion 16d are formed at a three-slot angular interval, and the first straight portion 16b and the second straight portion 16d are separated by a three-slot angular interval. It is inserted into the pair of slots 14 and attached to the stator core 11. The three-slot angular interval is an interval between the slot centers of the slots 14 located on both sides of the three consecutive teeth 13 and corresponds to one magnetic pole pitch. The coil body 16 is a distributed winding having a winding pitch of full-pitch winding.
As shown in FIGS. 3 (a) and 3 (b), the stator winding 15 is arranged with a coil body 16 mounted on a pair of slots 14 spaced apart by an angle of 3 slots and arranged at a 2-slot pitch in the circumferential direction. The layers configured as described above are mounted in three layers in the radial direction.

  For example, the stator winding 15 includes a U-phase winding 15u and a V-phase winding that are manufactured by connecting a coil body 16 mounted in a slot group constituted by slots 14 spaced apart by three slots at an angular interval. It is configured as a three-phase winding having 15v and W-phase winding 15w.

Here, the effect of the insulating tape 18 will be described with reference to FIGS. In FIG. 2A, 14 ₁ , 14 ₂ ... 14 ₇ , 14 ₈ are slot numbers assigned in the order of arrangement in order to identify eight consecutive slots 14.

Paying attention to the coil body 16 constituting the V- phase winding 15v attached to the pair of slots 14 ₃ and 14 ₆ , as shown in FIG. 3B, the first and second extending from the slot 14 ₃ the coil end portion 16c, the inclined portion of 16e overlies the first and second coil end portion 16c, the inclined portion of 16e and the radial direction of the coil 16 constituting the U-phase winding 15u out extending from the slot 14 _4, cross To do. Similarly, the slot 14 first and second coil end portion 16c out extending from _6, the inclined portion of the 16e, first and second coil end of the coil body 16 constituting the W phase winding 15w out extending from the slots 14 ₅ The portions 16c and 16e overlap and intersect with the inclined portions in the radial direction. Then, the insulating tape 18 wound around the inclined portions of the first and second coil end portions 16c and 16e is sandwiched between the inclined portions of the first and second coil end portions 16c and 16e overlapping in the radial direction. Thereby, the crossing portions of the coil bodies 16 of different phases are separated in the radial direction, and insulation between the phases is ensured. In the first embodiment, the coil bodies 16 of different phases do not overlap in the axial direction at the coil end portion.

  The first and second coil end portions 16c and 16e are formed to have a thickness t2 that is about half of the first and second linear portions t1, and the crank portion 17 is formed at the tops of the first and second coil end portions 16c and 16e. The first and second coil end portions 16c and 16e are displaced in the radial direction by t2 between the first straight portion 16b side and the second straight portion 16d side. Therefore, as shown in FIG. 3A, the coil body 16 can be attached to the pair of slots 14 without being interfered with the first and second coil end portions 16c and 16e of the other coil bodies 16. The coil body 16 can be easily attached to the stator core 11, the productivity can be improved, and the increase in diameter of the coil end can be suppressed.

According to the first embodiment, since the insulating tape 18 is wound around the inclined portions of the first and second coil end portions 16c and 16e, the rigidity of the coil body 16 after molding is increased and the handling becomes easy. , Productivity is increased.
The insulating tape 18 is wound around the inclined portion so as to be orthogonal to the length direction of the inclined portions of the first and second coil end portions 16c and 16e. Therefore, the thickness of the winding portion of the insulating tape 18 due to winding the insulating tape 18 around the bulging portions on the base side of the first and second coil end portions 16c, 16e and the deformed portions such as the crank portion 17 Generation | occurrence | production can be avoided and uniform insulation thickness is obtained.

Since the insulating tape 18 is wound only on the inclined portions of the first and second coil end portions 16c and 16e that contribute to the insulation between the phases, the insulation thickness does not become excessive in part, and the coil end Increase in diameter is suppressed.
Since the radial thickness of the first and second coil end portions 16c and 16e is about half the radial thickness of the first and second linear portions 16b and 16d, the top portion when the crank portion 17 is bent and formed. The bending radius becomes smaller. Therefore, the radial dimension of the coil end where the first and second coil end portions 16c and 16e overlap in the radial direction can be reduced, and the increase in the diameter of the coil end can be suppressed.

  Further, the insulating tape 18 is not wound around the first and second straight portions 16 b and 16 d inserted into the slot 14. Therefore, the space factor of the conductor wire 20 accommodated in the slot 14 is increased, the conductor wire 20 can be increased in diameter, and the resistance of the conductor wire 20 is reduced, so that the output of the rotating electrical machine can be increased. .

In the first embodiment, the crank portion is formed at the tops of the first and second coil end portions, but the crank portion is not necessarily formed.
Moreover, in the said Embodiment 1, although the insulating tape is wound around both the 1st and 2nd coil end parts which cross | intersect a radial direction, the insulating tape should just be arrange | positioned between the coil end parts which cross | intersect, An insulating tape may be wound only on one of the intersecting coil end portions.

Embodiment 2. FIG.
In the first embodiment described above, a rotating electrical machine is described in which the number of poles of the rotor 5 is 8, the number of slots of the stator core 11 is 24, and the stator winding 15 is a three-phase winding. In Embodiment 2, a rotating electrical machine in which the number of poles of the rotor 5 is 4, the number of slots of the stator core 11 is 24, and the stator winding 15A is a three-phase winding will be described. That is, the slots 14 are formed in the stator core 11 at a rate of two per phase per phase.

  6 is a front view showing a coil body constituting a stator winding of a stator in a rotary electric machine according to Embodiment 2 of the present invention, and FIG. 7 shows the stator in the rotary electric machine according to Embodiment 2 of the present invention. FIG. 7 (a) is a view of the stator seen from one side in the axial direction, and FIG. 7 (b) is a view of the stator seen from the inner diameter side. It is.

  In FIG. 6, the coil body 16 </ b> A is configured in the same manner as the coil body 16 except that the first straight line portion 16 b and the second straight line portion 16 d are separated by a 5-slot angular interval. Then, the insulating tape 18a is provided in a substantially half region on the base portion side of the inclined portion on the first straight portion 16b side of the first coil end portion 16c of the coil body 16A and the second straight portion of the second coil end portion 16e. A 16d-side inclined portion is mounted by being wound a plurality of times so as to be orthogonal to the length direction of the inclined portion in a substantially half region on the base portion side. Further, the insulating tape 18b is provided in a substantially half region on the crank portion 17 side of the inclined portion on the second linear portion 16d side of the first coil end portion 16c of the coil body 16A, and on the first straight line of the second coil end portion 16e. The inclined portion on the side of the portion 16b is mounted in a substantially half region on the crank portion 17 side by being wound a plurality of times so as to be orthogonal to the length direction of the inclined portion.

  As shown in FIGS. 7 (a) and 7 (b), the coil body 16A has a layer formed by being attached to a pair of slots 14 spaced apart by 5 slots and arranged at a 2-slot pitch in the circumferential direction. It is mounted in three layers in the radial direction. The stator winding 15A is configured as a three-phase winding having a U-phase winding 15u, a V-phase winding 15v, and a W-phase winding 15w, as shown in FIG. 7B.

  Here, as shown in FIG. 7B, the base side of the inclined portion on the first linear portion 16b side of the first coil end portion 16c of the coil body 16A constituting the U-phase winding 15u is the W-phase winding. The first coil end portion 16c of the coil body 16A constituting the wire 15w overlaps the root side of the inclined portion on the second straight portion 16d side of the first coil end portion 16c in the radial direction, and the inclined portion on the first straight portion 16b side of the first coil end portion 16c. Of the first coil end portion 16c of the coil body 16A constituting the V-phase winding 15v overlaps the crank portion 17 side of the inclined portion on the second linear portion 16d side in the radial direction. The base side of the inclined portion on the second linear portion 16d side of the first coil end portion 16c of the coil body 16A constituting the U-phase winding 15u is the first coil end portion 16c of the coil body 16A constituting the V-phase winding 15v. The first straight line portion 16b side of the inclined portion is radially overlapped with the base side of the inclined portion, and the first coil end portion 16c of the inclined portion on the second straight line portion 16d side of the crank portion 17 side constitutes the W-phase winding 15w. The first coil end portion 16c of the body 16A overlaps the crank portion 17 side of the inclined portion on the first linear portion 16b side in the radial direction.

In this way, the first coil end portion 16c of the coil body 16A overlaps and intersects with the first coil end portion 16c of the coil body 16A of a different phase in the radial direction at four locations. Similarly, the second coil end portion 16e of the coil body 16A also overlaps and intersects with the second coil end portion 16e of the coil body 16A of a different phase in four radial directions. The insulating tapes 18a and 18b wound around the inclined portions of the first and second coil end portions 16c and 16e are sandwiched between the inclined portions of the first and second coil end portions 16c and 16e that overlap in the radial direction. Thereby, the crossing portions of the coil bodies 16 of different phases are separated in the radial direction, and insulation between the phases is ensured.
Further, since the radial thickness of the first and second coil end portions 16c and 16e is about half the radial thickness of the first and second linear portions 16b and 16d, the crank portion 17 is bent. The bending radius at the top of the head is reduced and the increase in diameter of the coil end is suppressed.

  Therefore, the second embodiment also has the same effect as the first embodiment.

  Here, the magnitude of the voltage applied to the coil body 16A constituting the U-phase winding, the V-phase winding, and the W-phase winding differs depending on the position in the phase winding. Specifically, when the U-phase winding, the V-phase winding, and the W-phase winding are Y-connected, a larger voltage is applied to the coil body 16A that is closer to the feeding portion of each phase winding. The potential difference at the intersection of the inclined portions of the first and second coil end portions 16c and 16e of the coil body 16A having different phase windings also varies depending on the position of the intersecting coil body 16A in the phase winding. Therefore, it is desirable to set the thickness of the wound portion of the insulating tapes 18a and 18b in accordance with the potential difference at the intersection between the inclined portions of the first and second coil end portions 16c and 16e.

  For example, in FIG. 7B, when the potential difference at the intersection 19 is large, the thickness of only the wound portion of the insulating tape 18b wound around the intersection 19 is increased. Thereby, the insulation between the phases at the intersection 19 can be ensured without increasing the thickness of the wound portions of the insulating tapes 18a and 18b wound around the other intersection where the potential difference is small. That is, since the insulation thickness by the insulating tapes 18a and 18b does not become excessive partially, an increase in the diameter of the coil end can be suppressed. In addition, the thickness of the winding part of the insulating tapes 18a and 18b may be changed with the tape thickness being constant, or may be changed with the number of turns being constant.

  In the second embodiment, the thickness of the wound portion of the insulating tapes 18a and 18b is changed in accordance with the potential difference at the intersecting portion 19. However, in other embodiments, the thickness is also varied depending on the potential difference at the intersecting portion. Needless to say, the thickness of the winding portion of the insulating tape may be changed.

Embodiment 3 FIG.
8 is a front view showing a coil body constituting a stator winding of a stator in a rotary electric machine according to Embodiment 3 of the present invention, and FIG. 9 shows a stator in the rotary electric machine according to Embodiment 3 of the present invention. FIG. 9 (a) is a view of the stator viewed from one side in the axial direction, and FIG. 9 (b) is a view of the stator viewed from the inner diameter side. It is.

In FIG. 8, the insulating tape 18c is perpendicular to the length direction of the inclined portion at the inclined portion between the base side of the first and second coil end portions 16c, 16e of the coil body 16A and the crank portion 17. It is installed by winding it multiple times.
Other configurations are the same as those in the second embodiment.

  Also in the third embodiment, the first and second coil end portions 16c and 16e of the coil body 16A have diameters at four locations respectively with the first and second coil end portions 16c and 16e of the coil body 16A of different phases. Overlapping and intersecting directions. Then, the insulating tape 18c wound around the inclined portions of the first and second coil end portions 16c, 16e is sandwiched between the inclined portions of the first and second coil end portions 16c, 16e overlapping in the radial direction. Thereby, the crossing portions of the coil bodies 16 of different phases are separated in the radial direction, and insulation between the phases is ensured.

Therefore, the third embodiment also has the same effect as the second embodiment.
In the third embodiment, the insulating tape 18c is wound around both coil bodies 16A of different phases adjacent in the radial direction. The insulating tape 18c is formed by the first and second coil end portions 16c and 16e. Since it is wound on almost the entire region of the inclined portion, if it is wound on the inclined portion of one of the first and second coil end portions 16c, 16e of the coil bodies 16A of different phases adjacent in the radial direction, Insulation can be ensured.

  In addition, although each said embodiment has demonstrated the case where this application is applied to an electric motor, even if it applies this application to a generator, there exists the same effect.

  In each of the above embodiments, the coil bodies are attached to a pair of slots located on both sides of (2n-1) consecutive teeth (n is a natural number of 2 or more) and arranged at a two-slot pitch. As described above, the present invention is applied to the case where the coil bodies are attached to a pair of slots located on both sides of n consecutive teeth (n is a natural number of 2 or more) and arranged at a 1-slot pitch. Even in this case, the same effect is obtained.

  DESCRIPTION OF SYMBOLS 10 Stator, 11 Stator iron core, 13 teeth, 14 slots, 15 Stator winding, 16, 16A Coil body, 16b 1st linear part, 16c 1st coil end part, 16d 2nd linear part, 16e 2nd coil End part, 18, 18a, 18b, 18c Insulating tape, 20 conductor wire, 100 rotating electric machine.

Claims (3)

A stator core in which teeth are arranged in the circumferential direction;
Each of the plurality of teeth that are formed in an annular shape in which a conductor wire coated with insulation is wound a plurality of times and both ends of the pair of linear portions are connected to each other by a coil end portion. And a stator winding having a plurality of coil bodies mounted on the stator core,
The coil body is formed such that a radial thickness of the coil end portion is thinner than a radial thickness of the linear portion,
The plurality of coil bodies are arranged such that each of the inclined portions from the root portion to the top of the coil end portion intersects the inclined portions of the coil bodies of different phases adjacent in the radial direction. ,
Insulating tape is wound on each of the both inclined portion to avoid the top portion to the coil end portion of the coil body,
Stator, characterized in that the radially Each intersection of the inclined portion adjacent Riau different phases, only the insulating tape is wound on one of the inclined portion is disposed. The stator according to claim 1 , wherein the insulating tape is wound only around the coil end portion. A rotating electrical machine comprising the stator according to claim 1 .

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