JP2007129865A - Rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electric machine capable of attaining reduction in the number of parts of an iron core press plate, easy manufacture, and high pressure between slots. <P>SOLUTION: A plurality of copper bars 10 are inserted in the slots of a rotor iron core 4, both edge parts of the plurality of copper bars 10 are connected with a short-circuit annular 11 respectively, and the iron core press plates 23 are provided on both sides of the rotor iron core 4 in a laminated layer direction to constitute a rotor 22. The iron core press plate 23 is composed of an annular part 23a and a projection part 23b which is extended from the annular part 23a in a radial direction to press a space between the slots, and the annular part 23a and the projection part 23b are integrally formed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotating electric machine having a cage rotor in which a copper rod is inserted into a slot of a rotor core.

  The structure of a conventional rotating electrical machine having a cage rotor will be described with reference to FIG. This type of rotating electrical machine has a structure in which a rotor 2 mounted on a shaft 1 is rotatably disposed inside a stator 3 at a predetermined interval. The rotor 2 and the stator 3 are configured by providing independent windings 6 and 7 on a rotor core 4 and a stator core 5 in which silicon steel plates are punched and laminated, respectively. Further, in the rotor core 4 and the stator core 5, spacing pieces 8 and 9 are arranged at appropriate intervals in the stacking direction in order to form ducts through which cooling air passes.

  Here, the winding 6 of the rotor 2 is not formed by winding a conducting wire, and the copper rods 10 are inserted into a plurality of slots formed at intervals in the circumferential direction of the outer peripheral edge of the rotor core 4. Each of the copper rods 10 has a cage shape in which both ends of the copper rods 10 are connected by the short-circuit ring 11, and the rotor core 4 includes a plurality of outer spacing pieces 12 radially disposed at both ends in the stacking direction. The outer spacing piece 12 is configured to be clamped via an iron core pressing plate 13 that presses the outer spacing piece 12.

  In the rotating electrical machine having such a structure, the rotor core 4 is tightened via the outer spacing piece 12 and the core retainer plate 13 to prevent the rotor core 4 from being struck and to prevent magnetic vibration and damage. However, if the structure of the iron core holding part is complicated and the number of parts is large, and the holding by the outer gap piece 12 and the iron core holding plate 13 is not sufficiently effective, the outer gap piece 12 may jump out during operation of the device. was there.

Thus, for example, as described in Patent Document 1, it has been considered to integrally form an annular body portion as an iron core pressing plate and a plurality of comb teeth for pressing between the slots by welding or the like.
JP 7-322544 A

  However, such a structure prevents comb teeth from popping out during operation, but the number of parts and assembly man-hours increase in manufacturing, and when the iron core retainer plate is tightened, the comb teeth are deformed and the space between the slots is increased. There was a risk that the presser foot could not be secured sufficiently.

  The present invention has been made to solve the above-described problems, and the object of the present invention is to provide a rotating electrical machine that can reduce the number of parts, simplify the production, and sufficiently secure the presser between the slots. Is to provide.

  In order to solve the above problems, a rotating electrical machine according to the present invention is a rotating electrical machine in which a rotor is disposed inside a stator, and the rotor includes a rotor core and a plurality of rotor cores inserted into slots of the rotor core. Are provided on both sides of the stacking direction of the rotor core, and the annular portion and the annular portion extend in the radial direction to hold the space between the slots. And an iron core retainer plate having a plurality of protrusions, and the annular portion and the protrusions of the iron core retainer plate are formed by integral molding.

  According to the rotating electrical machine of the present invention, since the projecting portion formed on the core retainer plate is formed integrally with the annular portion, the number of parts can be reduced, and the manufacture of the core retainer plate can be simplified, and the core retainer can be simplified. Since the projecting portion is not easily deformed when the plate is tightened, the presser between the slots can be sufficiently secured.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the rotating electrical machine of the present invention, of which FIG. 1 is a sectional front view showing the rotating electrical machine of the present invention in cross section, and FIG. 2 is used for the rotating electrical machine of FIG. It is a front view which shows the iron core holding plate currently made. 1 and 2, in the rotating electrical machine according to the present embodiment, the core retainer plates 23 provided on both sides in the stacking direction of the rotor core 4 are extended from the annular portion 23a and the annular portion 23a in the radial direction between the slots. It has a feature in that it is constituted by a plurality of projecting portions 23b for holding the core, and the annular portion 21a and the projecting portion 21b of the iron core retainer plate 21 are formed by integral molding.

  The rotor 22 is mounted on the shaft 1 and is rotatably disposed inside the stator 3 with a predetermined interval. The rotor 22 and the stator 3 are respectively configured by providing windings 6 and 7 on a rotor core 4 and a stator core 5 in which silicon steel plates are laminated via duct-forming interval pieces 8 and 9, respectively. Yes.

  The windings 6 of the rotor 22 are respectively inserted into a plurality of slots formed at intervals in the circumferential direction of the outer peripheral edge portion of the rotor core 4, and the copper rods 10 are respectively short-circuited at both ends. 11, and the rotor core 4 is configured to be clamped via core pressing plates 23 disposed on both sides in the stacking direction.

  As shown in FIG. 2, the iron core retainer plate 23 is composed of an annular portion 23a and a projecting portion 23b extending radially from the annular portion 23a to press between the slots of the rotor iron core 4. The annular portion 23a and the protruding portion 23b are formed by integral molding by cutting off a portion facing the slot portion from a thick plate by a cutting method such as gas cutting or wire cutting.

  Therefore, if the rotor core 4 is tightened by the iron core holding plate 23, the entire side surface of the rotor iron core 4 can be uniformly pressed by the iron core holding plate 23 alone. Further, since the annular portion 23a and the protruding portion 23b of the iron core retainer plate 23 are integrally formed, the protruding portion 23b is not easily deformed when the iron core retainer plate 23 is tightened. In addition, the outer spacing pieces can be prevented from popping out as in the case where the outer spacing pieces are used separately. Furthermore, when manufacturing the iron core retainer plate 23, the number of parts can be reduced and the production of the iron core retainer plate can be simplified.

  3 and 4 show a second embodiment of the rotating electrical machine of the present invention, of which FIG. 3 is a cross-sectional front view showing the rotating electrical machine of the present invention in cross section, and FIG. 4 shows the rotating electrical machine of FIG. It is an expanded sectional view which shows the iron core holding plate currently used. 3 and 4, the present embodiment is different from the first embodiment in that the iron core holding surface of the protruding portion 33b of the iron core retainer plate 33 and the radial tip portion 33b1 of the protruding portion 33b are the annular portion 33a. It is in a state where it is configured to be inclined in a direction to be closer to the rotor core 4 side than the surface 33a1. This inclination can be formed by tapering the core pressing plate 33 when the annular portion 33a and the protruding portion 33b are integrally formed by means such as cutting.

  By configuring in this way, the same effect as in the first embodiment can be obtained, and when the iron core holding plate 33 is tightened, a spring effect is generated in the protruding portion 33b located between the slots, and the rotor iron core 4 It becomes possible to hold between the slots more strongly.

  FIG. 5 is an enlarged cross-sectional view showing an iron core retainer plate used in the third embodiment of the rotating electrical machine of the present invention. In FIG. 5, this embodiment is different from the second embodiment in that not only the iron core contact surface of the protrusion 43b of the iron core retainer plate 43 but also the back surface is inclined in the same direction as the iron core contact surface. The entire 43b is inclined to the rotor core 4 side.

  Also in the present embodiment, when the iron core holding plate 43 is tightened, a spring effect is generated in the projecting portion 43b located between the slots, and the slots between the rotor iron cores can be pressed more strongly. In addition, since the protruding portion 43b is easily elastically deformed along the axial direction with respect to the annular portion 43a, the outer peripheral side of the annular portion 43a is not lifted when the iron core holding plate 43 is tightened, and the side surface of the rotor core is removed. There is an effect that can be strongly pressed throughout.

It is a cross-sectional front view which shows 2nd Embodiment in the rotary electric machine of this invention. It is a front view which shows the iron core holding plate currently used for the rotary electric machine of FIG. It is a cross-sectional front view which shows 2nd Embodiment in the rotary electric machine of this invention. FIG. 4 is an enlarged cross-sectional view showing an iron core holding plate used in the rotating electrical machine of FIG. 3. It is an expanded sectional view which shows the iron core pressing plate used in 3rd Embodiment in the rotary electric machine of this invention. It is a cross-sectional front view which shows the structure of the conventional rotary electric machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Shaft 2, 22 ... Rotor 3 ... Stator 4 ... Rotor core 5 ... Stator iron core 6, 7 ... Winding 8, 9 ... Spacing piece 10 ... Copper rod 11 ... Short-circuit ring 12 ... Outer spacing piece 13, 23, 33, 43 ... Iron core pressing plates 23a, 33a, 43a ... annular portions 23b, 33b, 43b ... projecting portions 33a1 ... annular portion surfaces 33b1 ... tip portions

Claims (4)

  In a rotating electrical machine in which a rotor is disposed inside a stator, the rotor includes a rotor core, a plurality of copper bars inserted into slots of the rotor core, and both ends of the plurality of copper bars. Short-circuit rings connecting the respective parts, and an iron core holding plate provided on both sides of the rotor core in the stacking direction, and having an annular part and a plurality of protrusions extending radially from the annular part and pressing between the slots. A rotating electric machine comprising: an annular portion and a projecting portion of the iron core retainer plate formed by integral molding.   The core contact surface of the protruding portion of the iron core holding plate is configured to be inclined in a direction in which the radial tip end portion of the protruding portion is positioned closer to the rotor core side than the surface of the annular portion. The rotating electrical machine according to claim 1.   The rotating electrical machine according to claim 2, wherein the inclined iron core contact surface of the protruding portion is formed by taper processing.   The rotating electrical machine according to claim 2, wherein the protruding portion is inclined.

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