JP2019221064A - Processing device for stator - Google Patents

Abstract

To provide a processing device capable of scraping off resin adhered to an inner peripheral surface of a stator core without damaging the stator core on which the stator coil is fixed by the resin.SOLUTION: A processing device for a stator that includes an annular stator core and a stator coil fixed by resin to the stator core, comprises: a rotational member which is capable of advancing and retreating into/from the stator core, and is rotated and driven so as to rotate about a peripheral shaft center; and at least one blade tool held by the rotational member so as to scrape off resin adhered on an inner peripheral surface of the stator core with the rotation of the rotational core. The rotational member includes a tapered part which is formed so as to be thinner as it extends from the blade tool toward a tip.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a stator processing device including an annular stator core and a stator coil fixed to the stator core with a resin.

  2. Description of the Related Art Conventionally, as a stator core constituting a stator of an electric motor, a stator core including a plurality of open slots for winding, a plurality of iron core portions (teeth portions), and a core back portion is known (for example, Patent Document 1). reference). In this stator, a shaping portion is formed at the tip of each iron core tooth portion. After the windings (stator coils) are arranged in the opening slots for windings, each shaping portion is pressed toward the core back side. Each winding open slot is formed as a semi-closed slot.

Japanese Utility Model Publication No. 5-4771

  In a stator including the above-described stator core, generally, a stator coil wound around the stator core is fixed (adhered) to the stator core by a resin (a thermosetting resin) such as a varnish. However, when the stator coil is fixed to the stator core using the resin as described above, the applied resin may adhere to the inner peripheral surface of the stator core, and the resin adhered to the inner peripheral surface may be damaged without damaging the stator core. It needs to be removed.

  Thus, the present disclosure has as its main object to provide a processing device that can scrape resin adhered to the inner peripheral surface of a stator core without damaging the stator core to which the stator coil is fixed by the resin.

  A stator processing device according to an embodiment of the present disclosure is a stator processing device including an annular stator core and a stator coil fixed to the stator core by a resin, the stator processing device being capable of moving back and forth in the stator core and rotating about an axis. A rotating member driven to rotate as described above, and at least one cutting tool held by the rotating member so as to scrape the resin adhered to the inner peripheral surface of the stator core with the rotation of the rotating member. The member includes a tapered portion formed to be tapered from the cutting tool toward the tip.

  In the processing device according to the present disclosure, the rotating member that holds the cutting tool is formed with a tapered portion that tapers from the cutting tool toward the distal end. Thus, the rotating member can be inserted into the stator core while the tapered portion is guided by the inner peripheral surface of the stator core, so that the displacement of the axis between the rotating member holding the cutting tool and the stator core is suppressed. can do. As a result, the resin that adheres to the inner peripheral surface of the stator core can be scraped off without damaging the stator core by the blade tool that rotates together with the rotating member.

1 is a schematic configuration diagram illustrating a stator of a rotating electric machine to which a method for estimating a state of a thermosetting resin according to the present disclosure is applied. It is a top view which shows the stator of FIG. FIG. 3 is an enlarged view showing a state in which the segment coils of the stator shown in FIGS. 1 and 2 are fixed with resin. 1 is a schematic configuration diagram illustrating a stator processing device according to the present disclosure.

  Next, an embodiment for carrying out the invention of the present disclosure will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram illustrating a stator 1 of a rotary electric machine to which the method for estimating a state of a thermosetting resin according to the present disclosure is applied, and FIG. 2 is a plan view illustrating the stator 1. The stator 1 shown in these drawings constitutes, together with a rotor (not shown), a three-phase AC motor used as, for example, a driving source or a generator for an electric vehicle or a hybrid vehicle. The stator 1 of the present embodiment includes a stator core 2, a stator coil 3u (U-phase coil), a stator coil 3v (V-phase coil), and a stator coil 3w (W-phase coil).

  The stator core 2 is configured by laminating a plurality of electromagnetic steel plates 2p (see FIG. 2) formed in an annular shape by, for example, press working, and has an annular shape as a whole. Stator core 2 has a central hole 2h in which a rotor (not shown) is arranged, a plurality of teeth 2t protruding radially inward at a circumferential interval from an annular outer peripheral portion, and a plurality of teeth 2t adjacent to each other. And a plurality of slots 2s opened at the center hole 2h (see FIG. 2). The plurality of slots 2s each extend in the radial direction of the stator core 2 and are arranged in the circumferential direction at fixed intervals. The stator core 2 may be integrally formed by, for example, pressing and sintering ferromagnetic powder.

  Each of the stator coils 3u, 3v, 3w is formed by electrically joining a plurality of segment coils 4 inserted into a plurality of slots 2s of the stator core 2. The segment coil 4 is formed by bending a rectangular wire (conductor) having an insulating film made of, for example, an enamel resin on the surface into a substantially U-shape, and the tip portion 41 from which the insulating film has been removed. And a pair of legs 40 (see FIG. 1). The plurality of segment coils 4 have the same and even number (for example, 6 to 10) of leg portions 40 from each of the plurality of slots 2 s in a state where the long sides of the leg portions 40 are overlapped so as to abut each other. Are mounted on the stator core 2 so as to protrude. A pair of legs 40 of each segment coil 4 is inserted into a different slot 2 s of the stator core 2, and a portion of each leg 40 protruding from one end face (the upper end face in FIG. 1) of the stator core 2 is not shown. A bending process using a bending device is performed.

  Due to the bending process, the odd-numbered (odd-layer) leg portions 40 from the axis side of the stator core 2 are turned to one side in the circumferential direction while being twisted around the axis of the stator core 2, and are even-numbered (on the even-numbered layer). The leg 40 is tilted to the other side in the circumferential direction while being twisted around the axis of the stator core 2. Further, each leg 40 is bent by bending such that the tip 41 extends in the axial direction of the stator core 2. Each tip 41 is electrically joined (welded) to the tip 41 of the corresponding other segment coil 4. Thereby, the plurality of stator coils 3u, 3v, 3w are wound around the stator core 2, and each of the stator coils 3u, 3v, 3w is a two annular coil projecting outward from the end face in the axial direction of the stator core 2. It has end portions 3a and 3b. In addition, an insulator (insulating paper) not shown is arranged in each slot 2s of the stator core 2.

  In addition, one end of each of the three segment coils 4u, 4v, and 4w among the many segment coils 4 inserted into the slots 2s of the stator core 2 is not joined to the other segment coils 4, and FIGS. As shown in FIG. 2, it is bent toward the outer periphery of the stator core 2 by a bending device (not shown), and is bent upward in FIG. Hereinafter, one leg 40 of the three segment coils 4u, 4v, and 4w pulled out to the outer peripheral side of the stator core 2 in this manner is referred to as lead lines Lu, Lv, and Lw. The lead line Lu is included in the U-phase stator coil 3u, the lead line Lv is included in the V-phase stator coil 3v, and the lead line Lw is included in the W-phase stator coil 3w. Things.

  As shown in FIG. 2, the lead line Lu of the stator coil 3u is electrically connected to the tip of the power line 5u electrically connected to the U-phase terminal 6u by welding. Further, the lead wire Lv of the stator coil 3v is electrically connected to the distal end of the power line 5v electrically connected to the V-phase terminal 6v by welding. Further, the lead wire Lw of the stator coil 3w is electrically connected to the distal end of the power line 5w electrically connected to the W-phase terminal 6w by welding. Further, the power lines 5u, 5v, 5w are respectively fixed to resin holding members 7. The terminals 6u-6w are fixed to a terminal block (not shown) installed (fixed) in the housing of the rotating electric machine when the stator 1 is assembled, and connected to an inverter (not shown) via a power line (not shown). You.

  A thermosetting resin TR (varnish in the present embodiment) is applied to the stator core 2 from the lower coil end portion 3b in FIG. 1 to the upper coil end portion 3a in FIG. The thermosetting resin TR (varnish in this embodiment) is applied toward the coil end 3a or the coil end 3b. When applying the thermosetting resin TR, a DC current was applied from a DC power supply to heat each of the stator coils 3u, 3v, 3w wound around the stator core 2 to a predetermined temperature (for example, 160 ° C. in the case of a varnish). Thereafter, the stator core is positioned on a rotary table (not shown) provided in the equipment for applying the thermosetting resin TR. Further, as shown in FIG. 3, while rotating the stator core 2 around the axis (see the arrow in the figure), the thermosetting resin TR is continuously supplied from the dropping port No. of the nozzle N installed above the rotary table. The thermosetting resin TR is dripped into the gap between the adjacent segment coils 4 (legs 40) and the gap between the segment coil 4 and the stator core 2.

  Thus, when the thermosetting resin TR is solidified, the adjacent segment coils 4 are fixed by the thermosetting resin TR, and the segment coils 4 and the insulator (not shown) are fixed to the stator core 2. Insulating powder is applied to an exposed portion of the conductor such as a joint between the distal ends 41 of the segment coils 4 and a joint between the lead wires Lu-Lw and the power lines 5u-5w. However, instead of applying insulating powder to the exposed portions of the conductor, an annular resin mold portion that covers the coil end portion 3a may be formed on the stator 1.

  Here, when the stator coils 3u, 3v, 3w are fixed to the stator core 2 by the thermosetting resin TR, the thermosetting resin TR scattered from the nozzle N or the thermosetting resin TR protruding from the slot 2s is not fixed to the stator core 2. May adhere to the inner peripheral surface (the end surface of each tooth portion 2t) and solidify there. For this reason, in the stator 1 of the present embodiment, after the stator coils 3u, 3v, 3w are fixed to the stator core 2, the thermosetting resin adhered to the inner peripheral surface of the stator core 2 by using a processing device 50 as shown in FIG. The resin TR is scraped off.

  A processing device 50 shown in FIG. 4 includes a rotating member 51 formed in a stator core so as to be able to advance and retreat, a rotation driving device 52 for rotating the rotating member 51 around an axis, and a stator core with the rotation of the rotating member 51. A plurality of (for example, three to four) blades 53 held by the rotating member 51 so as to scrape off the thermosetting resin TR attached to the inner peripheral surface of the rotating member 51, and the rotating member 51 and the rotation driving device 52 are integrated. And an elevating mechanism (not shown) that moves (elevates) the rotating member 51 in the axial direction. In the present embodiment, the rotation driving device 52 includes a motor having a rotation shaft connected to the rotation member 51. In addition, the lifting mechanism may be a mechanism that raises and lowers the rotating member 51 and the rotation driving device 52 integrally by manual operation, or may be an electrically driven, hydraulically driven, or air-driven lifting mechanism.

  As shown in FIG. 4, the rotating member 51 has a cylindrical outer peripheral surface that is smaller than the inner diameter of the center hole 2 h of the stator core 2 (the distance between the end surfaces of the pair of teeth 2 t that face each other in the radial direction of the stator core 2). 511 and a tapered portion 512 formed at an end (lower end in FIG. 4) opposite to the rotation driving device 52. As shown in the drawing, the plurality of cutting tools 53 are located on the side of the rotation driving device 52 of the tapered portion 512, the cutting edge portion extends parallel to the axis of the rotating member 51, and has a slight diameter from the outer peripheral surface 511. It is fixed to the rotating member 51 at equal intervals so as to protrude outward in the direction. Further, in the present embodiment, each cutting tool 53 has a radius of a cylindrical surface including an edge portion of a cutting edge portion of each cutting tool 53 about the axis of the rotating member 51 being slightly smaller than an inner diameter of the stator core 2. It is fixed to the rotating member 51. The tapered portion 512 is formed so as to be tapered from each cutting tool 53 toward the tip, and includes a conical (annular) tapered surface 513. In addition, a plurality of cutting tools 53 may be fixed to the tapered portion 512 as shown by a two-dot chain line in FIG.

  When the thermosetting resin TR attached to the inner peripheral surface of the stator core 2 is scraped using the processing device 50 as described above, the stator 1 in a state where the stator coils 3u, 3v, and 3w are fixed to the stator core 2 is removed. It is positioned coaxially below the rotating member 51. Stator 1 may be positioned with respect to processing device 50 using a plurality of holes formed in stator core 2 (electromagnetic steel plate 2p). Subsequently, while rotating the rotating member 51 around the axis by the rotation driving device 52, the rotating member 51 is moved closer (downward) to the stator 1 by an elevating device (not shown) and inserted into the center hole 2 h of the stator core 2. At this time, in the processing device 50, the rotating member 51 is placed in the stator core 2, that is, in the center hole 2 h while the tapered portion 512 that tapers from each cutting tool 53 toward the tip is guided by the inner peripheral surface of the stator core 2. Can be inserted. As a result, the displacement of the axis between the rotating member 51 and the stator core 2 can be suppressed, so that the plurality of blades 53 that rotate together with the rotating member 51 can damage the inner peripheral surface of the stator core 2 without damaging the stator core 2. The attached thermosetting resin TR can be scraped off.

  As described above, the processing device 50 of the present disclosure is a processing device of the stator 1 including the annular stator core 2 and the stator coils 3u, 3v, 3w fixed to the stator core 2 by the thermosetting resin TR. A rotating member 51 which is movable in and out of the stator core 2 and is rotated so as to rotate around the axis; and a thermosetting resin TR attached to the inner peripheral surface of the stator core 2 with the rotation of the rotating member 51. And a plurality of cutting tools 53 held by the rotating member 51 so as to scrape them. The rotating member 51 includes a tapered portion 512 that is formed so as to taper from each cutting tool 53 toward the tip. Thus, the thermosetting resin TR attached to the inner peripheral surface of the stator core 2 can be scraped off without damaging the stator core 2 by the plurality of blades 53 rotating together with the rotating member 51.

  Note that the invention of the present disclosure is not limited to the above embodiment at all, and it goes without saying that various changes can be made within the scope of the present disclosure. Furthermore, the above embodiments are merely specific embodiments of the invention described in the summary of the invention, and do not limit the elements of the invention described in the summary of the invention.

  The invention of the present disclosure can be used in the field of manufacturing a stator including a stator core and a stator coil.

  REFERENCE SIGNS LIST 1 stator, 2 stator core, 2p electromagnetic steel sheet, 2h center hole, 2s slot, 2t teeth, 3u, 3v, 3w stator coil, 3a, 3b coil end, 4, 4u, 4v, 4w segment coil, 40 legs , 41 tip part, 5u, 5v, 5w power line, 6u, 6v, 6w terminal, 7 holding member, 50 processing device, 51 rotating member, 52 rotation drive device, 53 cutting tool, 511 outer peripheral surface, 512 taper portion, 513 taper Surface, Lu, Lv, Lw Leader, N nozzle, No dropper, TR Thermosetting resin.

Claims (1)

An apparatus for processing a stator including an annular stator core and a stator coil fixed to the stator core by a resin,
A rotating member that is rotatable so as to be able to advance and retreat in the stator core and rotate around an axis;
At least one cutting tool held by the rotating member so as to scrape the resin adhered to the inner peripheral surface of the stator core with the rotation of the rotating member,
The stator processing apparatus according to claim 1, wherein the rotating member includes a tapered portion formed to be tapered from the cutting tool toward the tip.

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