JP2018007452A - Stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify manufacturing processes by eliminating a removing process for leaking-out resin.SOLUTION: A stator comprises: an insulation member 20 having a plate wall part 22 extending out beyond an axial end face of teeth 13 on an inner peripheral face side of a yoke 12; a coil 15 having a lead-out line 15b led out from a front end side of the teeth 13; and an annular member 31 fitted to the front end side of the teeth 13 so as to be in contact with the lead-out line 15b, and closing a front end-side opening of the teeth 13 of a cavity 40 between the axial end face of the teeth 13 and an inner face of the coil 15. The plate wall part 22 closes an opening of the cavity 40 on the side of the yoke 12, and the cavity 40 has an injection hole 25 for injecting varnish 60. The annular member 31 has, on its outer peripheral face, pressure relief grooves 32, 33 each having one end linked to the cavity 40 and the other end linked to the outside air beyond the lead-out line 15b. The pressure relief grooves 32, 33 each have the other end facing the lead-out line 15b.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a structure of a stator.

  The rotor of an electric motor or a generator is formed by winding a winding around a laminated rotor core tooth through an insulating member that acts as a bobbin, and applying a sealing agent made of resin on the outer periphery of the winding, A structure is used in which the shape of the winding is fixed by potting the outer periphery of the winding.

  A stator of an electric motor or a generator is formed by stacking steel plates, forming a stator core including a cylindrical yoke and a plurality of teeth protruding radially inward from the yoke, and forming a coil by winding a coil wire around the teeth. Configuration is used. Part of the coil wire wound around the teeth forms a coil end protruding outward in the axial direction from both axial end surfaces of the stator core. In such a stator, a configuration has been proposed in which varnish is dropped from the outer surface of the coil end and impregnated between the coil wires to fix the shape of the coil wires or the entire coil and improve the insulation.

  In addition, when a plurality of holes are provided in the ring-shaped reinforcing member that contacts the inner peripheral surface of the coil and supports the coil, and the coil and the stator core are resin-molded, the resin is formed through the plurality of holes in the ring-shaped reinforcing member. There has also been proposed a configuration for performing injection pressure relief (see, for example, Patent Document 1).

JP 2011-217455 A

  In the configuration described in Patent Document 1, when resin molding is performed, an excessive amount of resin may be injected to ensure resin injection. At this time, the resin leaks from the plurality of holes of the ring-shaped reinforcing member. Since the leaked resin protrudes inside the stator, there is a possibility of interference with the rotor. For this reason, it is necessary to remove the resin leaked from the plurality of holes after the resin molding, and the manufacturing process becomes complicated because the resin removing process is performed.

  Accordingly, an object of the present invention is to simplify the manufacturing process by eliminating the step of removing the leaked resin.

  The stator of the present invention is a stator, a stator core having a yoke extending in the circumferential direction, a plurality of teeth projecting radially from an inner circumferential surface of the yoke, and a circumferential direction covering at least a circumferential end surface of the teeth. An insulating member including a wall portion, a flange having a plate wall portion extending outward from at least the axial end surface of the tooth on the inner peripheral surface side of the yoke, and the peripheral wall portion on the outer side of the tooth. A coil having a lead wire extending from the tip end side of the tooth, and attached to each tip end side of the plurality of teeth so as to contact the lead wire, and an axial end surface of the tooth and the An annular member for closing the opening on the tip side of the tooth between the inner surface of the coil, and the plate wall portion closes the opening on the yoke side of the cavity A pressure release groove having an injection hole for injecting an adhesive into the cavity, the annular member having an outer peripheral surface with one end communicating with the cavity and the other end communicating with the outside air beyond the lead wire The other end of the pressure release groove faces the lead wire, and has the adhesive filled in the cavity from the injection hole.

  The present invention can simplify the manufacturing process by eliminating the step of removing the leaked resin.

It is a plane sectional view of a motor which has a stator. It is a fragmentary perspective view of a stator. FIG. 5 is a circumferential development view showing a tooth, an insulating member, an annular member, a yoke, and a coil as viewed from the inner peripheral side of the stator. It is a plane sectional view which shows the structure of the cavity between the axial direction outer surface of the insulating member of a stator, and a coil inner surface (AA cross section of FIG. 3). It is an enlarged view of the pressure release groove | channel seen from the outer peripheral side of the annular member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a motor 100 having a stator 11 according to an embodiment of the present invention will be briefly described with reference to FIG. As shown in FIG. 1, the motor 100 includes a cylindrical casing 10, a stator 11 attached to the inner surface of the casing 10, and a rotor 18 that rotates with a rotation shaft 19 around a rotation center 17 inside the stator 11. It has. The stator 11 includes an annular yoke 12, a plurality of teeth 13 protruding radially from the inner peripheral surface 12 b of the yoke 12 toward the rotation center 17, and a plurality of slots formed between the teeth 13. 16 is wound around the insulating member 20 that covers the outer surface of each tooth 13 through each slot 16 and the insulating member 20 that covers the outer surface of the tooth 13 and the inner peripheral surface 12b of the yoke 12. A plurality of concentrated winding coils 15.

  The stator core 14 is constructed by laminating electromagnetic steel plates. In addition, an annular member 31 is disposed on the tip side surface of the tooth 13 of the coil 15. The rotor 18 has a permanent magnet attached to the outer peripheral surface 18a. When electric power is supplied to the coil 15 of the stator 11, a magnetic force is generated in the coil 15, and the rotor 18 is rotated by this magnetic force and the magnetic force of the permanent magnet. The rotation output is taken out from the rotation shaft 19 to the outside.

  As shown in FIG. 2, the teeth 13 protruding from the yoke 12 extending in the circumferential direction are formed by laminating electromagnetic steel plates so as to have a square rectangular cross section, and an insulating member 20 made of resin is attached to the outer surface of the teeth 13. ing. The insulating member 20 includes a cylindrical portion 21 that covers the axial end surface 13a of the tooth 13 and the circumferential end surface 13b of the tooth 13, and a plate-like flange that extends outward from the opening edge of the cylindrical portion 21 on the yoke 12 side. 23. A coil 15 is wound around the circumferential wall portion 28 of the cylindrical portion 21 and the outer side of the axial outer surface 21a. As shown in FIGS. 2 and 3, the portion inserted into the slot 16 along the circumferential wall portion 28 of the cylindrical portion 21 of the coil 15 has a linear shape along the circumferential wall portion 28, and the inner surface of the coil 15. Is in contact with the circumferential wall 28. A lead wire 15 b of the coil 15 extends in the axial direction of the stator 11 from the protruding tip side of the tooth 13 of the coil 15. 2 and 3, the lead wire 15 b extends in the axial direction of the stator 11, but may be bent and extended in the circumferential direction of the stator 11.

  On the other hand, the coil end 15a protruding outward in the axial direction from the axial outer surface 21a of the cylindrical portion 21 of the coil 15 has an arcuate shape away from the axial outer surface 21a. Then, between the inner surface of the coil end 15a and the axially outer surface 21a, as shown in FIGS. 2 and 3, a cavity 40 having a substantially semi-elliptical cross section extending in the radial direction along the extending direction of the teeth 13 is formed. Yes. The cavity 40 has openings on the distal end side of the tooth 13 and the yoke 12 side, respectively. Since the side surface of the coil 15 on the yoke 12 side is in contact with the surface of the flange 23 of the insulating member 20, the opening on the yoke 12 side of the cavity 40 extends to the outer side in the axial direction of the yoke 12 of the flange 23. It is blocked by.

  As shown in FIGS. 2 and 4, the annular member 31 is an annular band plate, and the end surface in the width direction is attached to the axial outer surface 21 a on the tip side of the tooth 13 of the cylindrical portion 21, and the outer peripheral surface 31 a Is in contact with the surface on the tip side of the teeth 13 of the coil 15. Thereby, the annular member 31 closes the opening on the distal end side of the tooth 13 of the cavity 40. Further, the outer peripheral surface 31 a of the annular member 31 is in contact with the lead wire 15 b of the coil 15. The annular member 31 is attached to the axially outer surface 21a of the cylindrical portion 21 so that the inner peripheral surface 31b does not protrude from the tip of the tooth 13 toward the rotor 18 side. There will be no interference.

  As shown in FIGS. 2, 3, and 5, the outer circumferential surface 31 a of the annular member 31 is provided with a pressure relief groove 32 that faces the cavity 40 and extends in the circumferential direction. One end of the pressure release groove 32 communicates with the cavity 40, and the other end is located beyond the lead wire 15b. Further, a pressure release groove 33 extending from the other end of the pressure release groove 32 to the inner side in the axial direction of the motor 100 to the end face in the width direction is provided between the adjacent coils 15 and in the vicinity of the lead wire 15b. Yes. The pressure release groove 33 is provided adjacent to the lead wire 15b, and the outlet 33a of the pressure release groove 33 contacts the lead wire 15b. The pressure release grooves 32 and 33 form an air flow path that communicates the cavity 40 with the outside air. This air flow path communicates with the outside air at one location of the outlet 33 a of the pressure release groove 33.

  Next, the process of filling the cavity 40 with the varnish 60 as an adhesive will be described with reference to FIG. When the varnish 60 is injected into the cavity 40 from the injection hole 25 provided in the plate wall portion 22 of the flange 23 as indicated by an arrow 91 in FIG. 4, the varnish 60 fills the cavity 40 and enters the cavity 40. It will be filled. On the other hand, the air contained in the cavity 40 is discharged to the outside through the pressure release grooves 32 and 33 provided in the annular member 31 as indicated by an arrow 92 in FIG. In this way, air is discharged to the outside from the injection holes 25 for injecting the varnish 60 and the pressure release grooves 32 and 33 arranged on the opposite side in the radial direction, so that the varnish 60 injected from the injection hole 25 is As shown in FIG. 4, the cavity 40 is filled from the plate wall portion 22 toward the distal end side of the tooth 13. Further, the path through which the air is discharged from the cavity 40 is one path by the pressure release grooves 32 and 33, that is, since it is not in communication with the outside air except for the outlet 33a of the pressure release groove 33, other air is discharged when the air is discharged. Inhalation of air from the portion is suppressed.

  Further, when the filling of the varnish 60 is continued, the varnish 60 enters the pressure release groove 32 from the cavity 40 and is filled in the pressure release grooves 32 and 33. And the varnish 60 leaks outside from the outlet 33a of the pressure release groove 33. The leaked varnish 60 is guided by adhering to the lead wire 15b and flows along the lead wire 15b (see arrow F in FIG. 5). Thus, if it can be confirmed visually that the varnish 60 has protruded to the outside of the pressure release groove 33, it is determined that the varnish 60 is completely filled in the cavity 40, and the injection of the varnish 60 is terminated. The varnish 60 filled in the cavity 40 is in close contact with the outer surface of the insulating member 20 and the inner surface of the coil 15 and firmly bonds the coil 15 and the insulating member 20 when cured. Further, when the varnish 60 flowing out from the pressure release groove 33 through the lead wire 15b is cured, the lead wire 15b is firmly bonded to the tubular portion 21 of the insulating member 20.

  As described above, since the stator 11 can fill the cavity 40 between the outer surface of the insulating member 20 and the inner surface of the coil 15 with the varnish 60, the coil 15 and the insulating member 20 are firmly bonded. Can do. In addition, since air is discharged to the outside from the pressure release grooves 32 and 33 arranged on the opposite side in the radial direction from the injection hole 25 for injecting the varnish 60, the stator 11 is injected from the injection hole 25. Is smoothly filled into the cavity 40 from the plate wall portion 22 toward the distal end side of the tooth 13. At this time, since only one portion of the outlet 33a of the pressure release groove 33 communicates with the outside, the suction of air can be suppressed during air discharge, and the varnish 60 can be filled so that no bubbles remain in the cavity 40. That is, generation of voids in the varnish 60 can be suppressed, and the varnish 60 can be brought into close contact with the outer surface of the insulating member 20 and the inner surface of the coil 15. Thereby, the adhesive force of the coil 15 and the insulating member 20 can be improved, and the fixation reliability of the coil 15 of the stator 11 can be improved.

  Further, the varnish 60 passes through the pressure release grooves 32 and 33 and leaks from the outlet 33a of the pressure release groove 33 through the lead wire 15b. That is, since the varnish 60 leaks in the axial direction of the stator 11 between the adjacent coils 15, the leaked varnish 60 does not contact the rotor 18. For this reason, it is not necessary to remove the leaked varnish 60, and the manufacturing process can be simplified. Moreover, the stator 11 can confirm that the varnish 60 is filled in the cavity 40 by visually inspecting the protrusion of the varnish 60 from the outlet 33a of the pressure release groove 33, so that the inspection process is simplified. Can be achieved.

  Further, the varnish 60 flowing through the lead wire 15b is cured, so that the lead wire 15b can be firmly bonded to the cylindrical portion 21 of the insulating member 20. Further, even if the attachment of the annular member 31 and the cylindrical portion 21 is removed, the annular member 31 is fixed to the coil 15 by the varnish 60, so that the annular member 31 comes off in the axial direction of the stator 11. Can be prevented. In addition, although the example which applied this invention to the motor 100 was demonstrated, you may apply this invention to a generator or a motor generator.

  10 casing, 11 stator, 12 yoke, 12b, 31b inner peripheral surface, 13 teeth, 13a axial end surface, 13b circumferential end surface, 14 stator core, 15 coil, 15a coil end, 15b lead wire, 16 slot, 17 center of rotation, 18 Rotor, 18a, 31a Outer peripheral surface, 19 Rotating shaft, 20 Insulating member, 21 Cylindrical part, 21a Axial outer surface, 22 Plate wall part, 23 Flange, 25 Injection hole, 28 Circumferential wall part, 31 Ring member, 32 33 Depressurization groove, 33a outlet, 40 cavity, 60 varnish, 100 motor.

Claims (1)

A stator,
A stator core having a yoke extending in the circumferential direction and a plurality of teeth projecting radially from the inner circumferential surface of the yoke;
An insulating member comprising: a circumferential wall portion covering at least a circumferential end surface of the tooth; and a flange having a plate wall portion extending outward from at least the axial end surface of the tooth on the inner circumferential surface side of the yoke;
A coil wound around the outside of the teeth via the circumferential wall and having a lead wire extending from the tip side of the teeth;
An annular member that is attached to each tip end side of the plurality of teeth so as to come into contact with the lead wire and closes the opening on the tip end side of the tooth between the axial end surface of the teeth and the inner surface of the coil. And comprising
The plate wall portion closes an opening of the cavity on the yoke side, and includes an injection hole for injecting an adhesive into the cavity.
The annular member is provided with a pressure relief groove on one outer periphery of the annular member, one end communicating with the cavity and the other end communicating with outside air beyond the lead wire, and the other end of the pressure relief groove is the lead wire. And
Having the adhesive filled into the cavity from the injection hole;
Stator characterized by.

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