JPH08140297A - Winding protective cover of motor - Google Patents

Abstract

PURPOSE: To prevent poor voltage withstand strength due to drooped wires of a winding by integrally forming with resin a main body of a donut-like winding protective cover which has a U-shaped recess that forms a ring and a movable cover 3 which is installed near an outer side face of the main body of the winding protective cover and which covers an outer side face and a bottom face of a coil end. CONSTITUTION: A winding protective cover 1 is made by integrally forming with resin a donut-like main body 2 which has a U-shaped recess that forms a ring and which covers an upper face, an inner side face, and an outer side face of a coil end and a movable cover 3 which is installed on the outer side face of the main body 2 and which covers the outer side face and a bottom face of the coil end. By covering the coil end with the main body 2 of the winding protective cover, the jutting of a winding from the upper face, the inner side face, or the outer side face of the coil end is prevented. Due to this structure, drooped wires of the winding are never brought into contact with a core and thereby poor voltage withstand strength can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding protection cover for an electric motor, which covers a coil end of a winding housed in a slot of a stator core.

[0002]

2. Description of the Related Art In a stator of an electric motor used for a washing machine or the like, the stator has a ring-shaped winding wire housed in a slot of a core. In addition, while moving this stator to the next process line (or in the case of a mold motor,
During molding), one or more of the winding portions, so-called coil ends, protruding from the slot of the core may protrude for some reason and come into contact with the core of the stator, resulting in poor pressure resistance. . Therefore, in the conventional electric motor, a winding protection cover is used to prevent the winding from protruding, thereby taking measures against this breakdown voltage failure.

A conventional example of a winding protection cover is shown in FIGS.
Will be explained. FIG. 11 is a front view of the stator.
FIG. 12 is a perspective view of a conventional winding protection cover. FIG. 13 is a front view of the stator after the winding protection cover in FIG. 12 is attached to the coil ends. 14
FIG. 14 is a sectional view taken along line CC of the stator in FIG. 13.

In FIG. 11, a stator 10 is a stator 1.
It is composed of a core 12 having a slot 11 formed on the inner side of 0, and a plurality of windings 13 housed in the slot 11 of the core 12 and wound in an arbitrary number of turns in a ring shape. The winding 13 is composed of an outer winding 13 a wound on the outside of the slot 11 and an inner winding 13 b wound on the inner diameter side of the slot 11.

In FIG. 12, the coil end surface on the end surface side of the core is the bottom surface, the surface opposite to this bottom surface is the top surface, the coil end surface on the inner diameter side of the core is the inner peripheral side surface, and the surface opposite to this inner peripheral side surface is the outer peripheral side surface. Then, the winding protection cover 14 is integrally formed of resin or the like in a donut shape in which U-shaped grooves are connected in a ring shape to cover the upper surface, the inner peripheral side surface, and the outer peripheral side surface of the coil end.

In FIG. 13, the coil end is covered with a winding protection cover 14 to prevent the winding from protruding.

[0007]

As described above, by covering the inner peripheral side surface and the outer peripheral side surface of the coil end of the winding 13 with the conventional winding protection cover 14, the winding 13 is covered.
The protruding of the film is prevented. However, the conventional winding protection cover 14 does not cover the bottom surface of the coil end.

That is, in the outer winding 13a housed outside the slot 11, the coil end of the outer winding 13a is housed in a slot separated from the slot 11 by several slots, so that when the stator 10 is molded. As shown in FIG. 14, a part of the coil end may be damaged by the molding pressure of No. 1 or vibration during transportation to the next process line, as shown in FIG.
4 may protrude in the direction of the opening (bottom surface direction) to form a so-called vertical line 15, which may come into contact with the core 12 and cause a poor withstand voltage.

Therefore, it was necessary to varnish the coil end of the winding 13 or to tie the coil end with hemp thread or the like.

[0010]

Therefore, according to the present invention, a donut-shaped winding protection cover main body 2 in which U-shaped grooves are connected in a ring shape, and a winding protection cover main body in the vicinity of an outer peripheral side surface thereof are provided. A winding protection cover for an electric motor, characterized in that a movable cover that is attached and covers the outer peripheral side surface and the bottom surface of a coil end is integrally molded of resin.

[0011]

By covering the coil end with the winding protection cover body, the winding is prevented from protruding from the upper surface, the inner peripheral side surface and the outer peripheral side surface of the coil end. And
Focusing on the mounting part of the movable cover and the winding protection cover,
Move the movable cover toward the center of the core, insert the bottom cover of the movable cover between the coil end and the core, and use this bottom cover and side cover to secure the winding from the outer peripheral side surface and bottom surface of the coil end. Prevent the protrusion.

[0012]

Embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a front view of a winding protection cover according to the present invention. FIG. 2 is a rear view of the winding protection cover according to the present invention. FIG. 3 is an enlarged perspective view of the movable cover according to the present invention. FIG. 4 is a partially enlarged rear view of the mounting portion of the winding protection cover body and the movable cover in the present invention. FIG. 5 is a partial perspective view of the winding protection cover as seen from the portion A of the winding protection cover in FIG. 1. FIG. 6 is a partially enlarged back view of the winding protection cover for explaining a method of moving the movable cover to fix it to the winding protection cover body.
FIG. 7 is a partial perspective view of the winding protection cover as seen from a portion A of the winding protection cover in FIG. 1 for explaining a method of moving and fixing the movable cover to the winding protection cover body. FIG.
FIG. 3 is a front view of the stator after the winding protection cover in FIG. 1 is attached to the coil ends. FIG. 9 is an enlarged front view showing the operation when the movable cover is inserted into the winding after the winding protection cover is attached to the coil end. Figure 10
FIG. 9 is a sectional view taken along line BB in FIG. 8.

In FIGS. 1 and 2, a winding protection cover 1 is a doughnut-shaped winding in which U-shaped grooves are connected in a ring shape so as to cover the upper surface, the inner peripheral side surface, and the outer peripheral side surface of the coil end. The protective cover main body 2 and the movable cover 3 provided on the outer peripheral side surface of the winding protective cover main body 2 to cover the outer peripheral side surface and the bottom surface of the coil end are integrally formed of resin or the like.

In FIG. 3, the movable cover 3 is a bottom cover 5 having one or a plurality of comb-shaped projections.
And a side cover 6 extending perpendicularly to the bottom cover 5, and a wedge-shaped lock portion 7 extending from the bottom cover 5.

In FIG. 4, the movable cover 3 and the winding protection cover body 2 are made thinner by thinning the base portion of the movable cover 3 (the portion where the winding protection cover body 2 is attached).
It is possible to move the movable cover 3 around the mounting portion of and.

In FIG. 5, the protrusion cover 4 is provided so as to extend from the outer peripheral side surface of the winding protection cover body 2 of the winding protection cover 1.

In FIG. 6, the movable cover 3 is moved toward the center of the core. Then, the movable cover 3 is fixed by hooking the lock portion 7 of the movable cover 3 on the inner peripheral surface of the protrusion cover 4.

In FIG. 8, the coil end is covered with a winding protection cover 1 to prevent the winding from protruding.

In FIGS. 9 and 10, the coil end of the winding 13 shown in FIG. 11 is covered with the winding protection cover body 2. Then, the movable cover 3 is moved toward the center of the core, and the bottom cover 5 is inserted between the winding 13 and the core 12. At this time, when a plurality of protrusions of the bottom cover 5 are provided, the intervals between the protrusions are set so that they can be inserted between the tooth portion 16 of the core 12 and the winding 13.

With the winding protection cover 1 as described above,
Even if there is a hanging line 15, the bottom cover 5 allows the hanging line 15
Can be lifted to prevent contact with the core 12.

In this embodiment, countermeasures are mainly taken in the central portion of the outer winding 13a of the winding 13 which is highly likely to be a hanging wire. The mounting position of the cover or the number of protrusions of the movable cover may be changed.

[0022]

According to the present invention, it is possible to omit the step of varnishing or tying the coil end with hemp thread or the like. Further, since the hanging wire does not come into contact with the core, it is possible to reliably prevent the breakdown voltage failure.

[0023]

[Brief description of drawings]

FIG. 1 is a front view of a winding protection cover according to the present invention.

FIG. 2 is a rear view of the winding protection cover according to the present invention.

FIG. 3 is an enlarged perspective view of a movable cover according to the present invention.

FIG. 4 is a partially enlarged rear view of the main body of the winding protection cover and the mounting portion of the movable cover according to the present invention.

5 is a partial perspective view of the winding protection cover in FIG. 1 as seen from a portion A. FIG.

FIG. 6 is a partially enlarged rear view of the winding protection cover, illustrating a method of moving and fixing the movable cover to the winding protection cover body.

FIG. 7 is a partial perspective view of the winding protection cover as seen from a portion A of the winding protection cover in FIG. 1 for explaining a method of moving and fixing the movable cover to the winding protection cover body.

8 is a front view of the stator after the winding protection cover in FIG. 1 is attached to the coil ends.

FIG. 9 is an enlarged front view showing the operation when the movable cover is inserted into the winding after the winding protection cover is attached to the stator.

10 is a cross-sectional view taken along line BB in FIG.

FIG. 11 is a front view of a stator.

FIG. 12 is a perspective view of a conventional winding protection cover.

13 is a front view of the stator after the winding protection cover in FIG. 12 is attached to the winding of the stator.

14 is a cross-sectional view taken along line CC of the stator shown in FIG.

[Explanation of symbols]

 1, 14 ... Winding protection cover 2 ... Winding protection cover main body 3 ... Movable cover 4 ... Projection cover 5 ... Bottom cover 6 ... Side cover 7 ... Lock part 10 ... Stator 11 ... Slot 12 ... Core 13 ... Winding 15 … Drop line 16… Teeth

Claims (1)

[Claims] 1. A doughnut-shaped winding protection cover body 2 in which a U-shaped groove is connected in a ring shape in a winding protection cover of a motor for covering a coil end of a winding housed in a slot of a core of a stator. And a movable movable cover that is attached near the outer peripheral side surface of the winding protection cover body and covers the outer peripheral side surface and the bottom surface of the coil end, which are integrally molded with resin. cover.