JP2015186419A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric motor having an insulator capable of absolving sagging of crossover lines to be connected to coils in order from the lead-out part.SOLUTION: The electric motor is configured to have two projections 9a and 9b and fitting grooves 10a and 10b. With this, when a stator core 2 is formed by folding a back yoke 1 using an apex of a V-shaped notch 7 of an acute angle, the crossover line 12 is folded back between the two projections, and an insulator 3 absorbs sagging on the crossover line.

Description

  The present invention relates to an electric motor using an insulator which has an inter-electrode crossover and is an insulating material between charged parts.

  Conventionally, this type of electric motor is known in which a crossover is routed on the outer diameter side (see, for example, Patent Document 1).

  Hereinafter, the electric motor will be described with reference to FIGS.

  As shown in FIG. 7, the stator 100 includes a tooth 101 and a back yoke 102 and includes a hook portion 103.

  As shown in FIG. 8, when each coil 104 is wound, the connecting wire 105 connected sequentially from the coil 104 is drawn. By arranging the connecting wire 105 via the hooking portion 103, it is realized that the connecting wire 105 between the poles has an appropriate tension after being annular.

Japanese Patent No. 3790509

  In such a conventional insulator, when the stator core is rounded, the winding is slackened when the connecting wire between the poles crosses the inner diameter side of the core bending fulcrum. However, in many annular stator cores, the bent portion is extremely on the outer diameter side. Therefore, it is difficult to secure an insulation distance from the jacket cover.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide an insulator that can suppress a slack of a jumper when the stator core is annular and can secure an insulation distance from an outer cover.

  In order to achieve this object, the present invention provides two protrusions and a protrusion fitting groove, thereby achieving the intended object.

  According to the present invention, since the two projecting portions and the projecting fitting groove are provided, the connecting portion can be routed so that the connecting wire has the same length in both the belt-like shape and the annular shape. Since it becomes possible, the effect that the slack of a crossover can be suppressed can be acquired.

Configuration diagram of an annular stator according to the first embodiment of the present invention Configuration diagram of the stator core (A) Plan view of the insulator, (b) Front view of the insulator (A) Left perspective view of the insulator, (b) Right perspective view of the insulator (A) Configuration diagram of the stator before the ring, (b) Partial enlarged view of the stator before the ring, (c) Partial enlarged view of the stator after the ring (A) Perspective view of the stator casing, (b) Internal perspective view of the stator casing Plan view showing the configuration of a conventional stator core The perspective view which shows the structure of the principal part of the rotary electric motor

  The electric motor of the present invention is provided with a plurality of T-shaped teeth at equal intervals on one long side portion formed in a band shape by a connecting portion, and a V-shaped cut portion is provided between the teeth. In the electric motor having a stator core having a back yoke, an insulator as an insulating material between each tooth and the V-shaped cut portion, and windings are sequentially wound around the teeth portion and having a same-polarity or different-polarity crossover wire, Two protrusions provided at both ends on the back yoke of the insulator, and a protrusion fitting groove provided so that the protrusions are fitted to each other, and the connecting wire passes through the two protrusions. When the back core is bent into an annular shape with the stator core serving as a fulcrum at the V-shaped apex of the notch, the connecting wire turns back between the two protrusions. Having the configuration.

  Thereby, since it becomes possible to route the connecting line so that the connecting line has the same length before and after the annular shape, it is possible to suppress the slack of the connecting line.

  Further, the size and shape of the protrusion can be freely changed. Thereby, there exists an effect that the slack of a crossover can be suppressed without being restricted by the magnitude | size of an electric motor.

  Moreover, it is preferable that the hook protrudes on one side of the protrusion. As a result, it is possible to prevent the connecting line from coming off and to arrange the connecting line at a predetermined position.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a stator 5 that is formed in an annular shape by attaching an insulator 3 to each tooth of a stator core 2 having a back yoke 1 on the outside and then winding a coil 4. The teeth are hidden by the insulator 3 and the coil 4 and will be described with reference to FIG. Below, the structure of each component and its characteristic are demonstrated.

  In FIG. 2, the stator core 2 is generally made of an electromagnetic steel plate, and is composed of a core part connection made up of an inverted Y-shaped tooth 6 and a back yoke 1.

  The connecting body is connected in a band shape by a thin connection portion 8 of a V-shaped cut portion 7 provided in the back yoke 1, and the connection portion 8 uses a V-shaped acute angle vertex as a fulcrum to form a V-shape. The back yoke 1 can be bent into an annular shape so as to eliminate the notch 7.

  Next, the insulator 3 will be described with reference to FIGS.

  First, in FIG. 3A, two protrusions 9a and 9b are provided at both ends of the top of the T-shaped insulator 3. In FIG.3 (b), the protrusion 9b has the hook part 11 in the one side of the circumferential direction of a front-end | tip part.

  Next, in FIG. 4A, there is a fitting groove 10b in which the protrusion 9b is fitted in the vicinity of the protrusion 9a, and in FIG. 4B, the fitting groove 10a in which the protrusion 9a is fitted in the vicinity of the protrusion 9b. Have

  That is, since the two protrusions 9a and 9b protrude from both ends of the top of the insulator 3, when the ring is formed as shown in FIG. 1, the protrusions 9a and 9b are fitted in the fitting grooves 10a and 10b of the two adjacent insulators 3. .

  Here, the positional relationship between the protrusions 9a and 9b is such that the protrusion 9b having the hook portion 11 is on the outer peripheral side of the protrusion 9a. FIG. 5 includes a plurality of coils 4 in which an insulator 3, which is an insulating material, is arranged on each tooth portion of the stator core 2, and windings are wound and sequentially connected via a crossover wire 12. Here, the connecting wire 12 will be described with reference to enlarged views of FIGS.

  The connecting wire 12 is provided on the back yoke 1 side of the protrusion 9b, the cut portion 7 is divided into two equal parts in the direction of the tooth 6, and the tooth 6 side of the protrusion 9a is provided. Here, it is assumed that the crossover line 12 follows the same path and arranges the crossover line when it starts to be wound from either the left or the right in FIG.

  With respect to the two protrusions 9a and 9b and the hook portion 11, chamfering is performed at a place where the crossover wire 12 can contact at least to prevent breakage of the winding wire.

  Further, the upper surface of the hook portion 11 is chamfered to prevent the crossover wire 12 from being caught during winding. And these protrusions 9a and 9b and the hook part 11 have the structure which has protruded in the space, and it can be shape | molded without using a slide metal mold | die for the cost reduction of a metal mold | die.

  As shown in FIG. 5 (b), the crossover wire 12 first passes from the left side of the drawing in the clockwise direction from the upper side to the lower side of the protrusion 9b, and then counterclockwise from the upper side to the lower side of the protrusion 9a. As shown in FIG. 5C, the projection 9b is folded from the lower side to the upper side of the projection 9a. At this time, the crossover wire becomes the height of the wound coil and crosses the lower portions of the two protrusions 9a and 9b.

  The protrusions 9a and 9b and the fitting grooves 10a and 10b have a clearance equal to or larger than the wire diameter of the crossover wire 12 so that they are not damaged even if the windings are sandwiched during fitting.

  In FIG. 5C, after the loop, the connecting wire 12 is folded back by the two protrusions 9a and 9b, and the size and positional relationship of the two protrusions 9a and 9b can be adjusted regardless of the motor size. The tension of the crossover 12 can be controlled, that is, the slack can be suppressed.

  Here, the stator 5 is generally covered with a casing made of a steel plate or a resin (corresponding to the “sheath cover” described in the background art).

  FIG. 6A shows an example of a casing made of a steel plate of the stator 5, and FIG. 6B shows an internal perspective view thereof.

  In FIG. 6 (b), the stator 5 is covered with a case A13 and a case B14 that are steel plates, and the non-charged portion that is a steel plate, the coil 4, and the connecting wire 12 require an insulation distance in accordance with the regulations. . In order to secure this necessary insulation distance, it is necessary to suppress the sag of the crossover wire 12. With the configuration described above, the excess sag of the crossover wire 12 is eliminated, and the necessary insulation distance can be secured.

  In the present embodiment, the protrusions have the shapes and positional relationships shown in FIGS. 3 to 5, but the crossover lines only have to be folded back between the protrusions, and are not limited to the shapes and positional relationships of the present embodiment.

  As described above, the two connecting portions and the protruding fitting groove are provided so that the connecting wire can be folded back when the stator wire is annular. Since it can be routed so as to be long, it is possible to obtain the effect of suppressing the slack of the crossover and ensuring the insulation distance from the jacket cover.

  The electric motor according to the present invention is useful as an insulator for an electric motor used for an annular stator core because it can absorb the slack of the connecting wire in which each coil is sequentially connected from the lead portion.

DESCRIPTION OF SYMBOLS 1 Back yoke 2 Stator core 3 Insulator 4 Coil 5 Stator 6 Teeth 7 Cut part 8 Connection part 9a, 9b Protrusion 10a, 10b Fitting groove 11 Hook part 12 Crossover 13 Case A
14 Case B

Claims (2)

A stator core having a back yoke in which a plurality of T-shaped teeth are provided at equal intervals on one long side portion side, and a V-shaped cut portion is provided between the teeth, formed in a band shape by a connecting portion; In the electric motor having an insulator as an insulating material between each tooth and the V-shaped cut portion, and having a winding having the same or different polarity crossing wound around the teeth portion, on the back yoke of the insulator Two protrusions provided at both ends of the wire, and a protrusion fitting groove provided so that the protrusions are respectively fitted, and the connecting wire is disposed so as to pass through the two protrusions, and the stator core When the back yoke is bent into an annular shape with the V-shaped apex of the cut portion as a fulcrum, the connecting wire is folded between the two protrusions. An electric motor. The electric motor according to claim 1, wherein the protrusion on the outer peripheral side has a hook portion protruding on one side.

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