JP2002247788A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of core insulations unable to be formed into V-shaped cut parts of a straight core, and a sufficient creeping distance being unable to be obtained. SOLUTION: A stator 10 of this motor has a stator core, comprising layered punched plates which comprise approximately straight back yokes 6, respectively, a plurality of teeth 5 formed on a back yokes 6, and V-shaped cut parts 7 formed between the teeth 6, and insulating spurs 8 attached to the stator core. The insulating spurs 8 have thin edges protruding from the V-shaped cut parts and, when the stator core is bent into an annular shape, the thin edges are made to overlap each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the insulation of a motor core using a straight core.

[0002]

2. Description of the Related Art The shape of a conventional insulating spool or insulating core mold for insulating a winding portion of a straight core will be described with reference to FIGS.

FIG. 7 is a plan view before bending a conventional straight core, FIG. 8 is a plan view after bending the straight core of FIG. 7, and FIG. 9 is a partially enlarged view of FIG.

[0004] The stator core includes a plurality of back yokes 6 and a plurality of teeth 5. Since the shape before bending the core is formed in a substantially straight line, the core is called a straight core 20. The straight core 20 is provided with a V-shaped notch 7 between the teeth 5 so that the teeth 5 can be bent in an annular shape after the teeth 5 are wound.

In order to insulate between the core and the coil 13, a spool 21 made of an insulating resin is inserted into the teeth 5 and the back yoke 6 of the straight core 20. Alternatively, a core mold that covers the core surface with an insulating resin is performed. A winding is applied to each of the insulated teeth 5 in this manner. After winding, the core 20 is bent from the V-shaped notch 7 so as to be substantially circular, and the butted portions 26 at both ends of the core 20 are welded to form the annular stator 22.

A rotor (not shown) is inserted into the stator 22 thus formed, and shafts projecting from both side surfaces of the rotor are rotatably held on a housing portion of a bracket (not shown). With this, it becomes an electric motor.

The annular stator 22 and one side surface of the stator 22 may be covered with a mold resin. In the case of this configuration, the motor is such that one shaft of the rotor is rotatably held in the housing portion formed by the mold, and the other end of the shaft is held by the housing portion of the bracket.

[0008]

In the conventional method of insulating the core of the straight core, there is a problem that the creepage distance cannot be obtained because the V-shaped notch cannot be insulated by either the spool method or the core molding method. Was.

[0009]

In the electric motor of the present invention, a plurality of teeth are formed on one side surface of a substantially straight back yoke, and a V-shaped notch is provided between the teeth on the side of the teeth. A stator in which an insulating spool is inserted into a stator core on which a punched plate is laminated, and a coil is wound around the teeth portion, and the flake is formed such that an end of the insulating spool protrudes toward a V-shaped notch. And the stator core is bent from the V-shaped notch into an annular shape, thereby improving the quality and characteristics by using a stator in which the adjacent thin pieces overlap each other.

According to a second aspect of the present invention, the core is formed by forming a core mold instead of the spool.

[0011]

By forming a thin piece so that the end of the insulating spool or the insulating core mold protrudes toward the V-shaped notch and winding and bending the core, a structure is obtained in which the thin pieces are overlapped. As a result, the creepage distance between the stator core and the wound coil can be ensured, and the withstand voltage failure and the like can be reduced and the quality can be improved. In addition, there is an effect that the number of turns of the coil can be increased and characteristics can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a plan view of a core assembly in which straight cores according to one embodiment of the present invention are stacked. The back yoke 6 is formed in a substantially straight shape, and a plurality of teeth 5 are arranged at equal intervals on one side
And it is provided so that it may protrude. A V-shaped notch is formed at an intermediate position between the two teeth 5.

FIG. 2 is a plan view of the straight core 2 according to one embodiment of the present invention, in which the spool 8 is used to insulate the core. This spool 8 is entirely formed with a thin wall,
The shape of each block composed of the teeth 5 and the back yoke 6 of the straight core 2 is substantially the same as that of each block. A thin piece is formed such that the end of the spool 8 projects toward the V-shaped cutout 7.

By inserting the spool 8 having such a shape into each block of the core 2 from both sides (the upper side and the rear side in FIG. 2), the place where the coil is wound is insulated with resin. .

FIG. 4 is a view in which a winding is applied to FIG. FIG.
The V-shaped notch 7 comes into close contact by bending the core to form an annular shape. And when the notch 7 comes into close contact,
As shown in FIG. 5 and FIG. 6, two adjacent thin pieces 11 overlap and come into close contact with each other. As a result, the distance between the wound coil and the straight core becomes longer than before, so that the creepage distance can be ensured.

FIG. 3 shows that the straight core 2 is insulated by the core mold 9. This core mold is formed by inserting the core 2 into the mold and then injecting an insulating resin. Thus, the core and the coil are isolated by the thin insulating resin.
Insulating in this manner eliminates the need to manually insert the insulator into the core.

[0018]

According to the present invention, by employing a structure in which the V-shaped notch is covered with the insulating thin piece, the creepage distance between the stator core and the wound coil can be ensured. As a result, the withstand voltage failure and the like are reduced, so that the quality is improved, and the number of turns of the coil can be increased.

[Brief description of the drawings]

FIG. 1 is a plan view of a straight core according to one embodiment.

FIG. 2 is a plan view of a straight core insulated by a spool according to one embodiment of the present invention.

FIG. 3 is a plan view of a straight core insulated by a core mold according to another embodiment of the present invention.

FIG. 4 is a plan view before bending a straight core according to an embodiment of the present invention.

FIG. 5 is a plan view after bending a straight core according to one embodiment of the present invention.

FIG. 6 is a partially enlarged view of FIG. 5;

FIG. 7 is a plan view before bending a conventional straight core.

FIG. 8 is a plan view after bending a conventional straight core.

FIG. 9 is a partially enlarged view of FIG. 8;

[Explanation of symbols]

 1.2.3.4.20. Straight core 5. Teeth 6. Back yoke 7. 7. V-shaped notch Spool 9. Core mold 10. Stator 11. Flakes 12. Butt portion 13. coil

Claims (2)

[Claims] 1. A stator core having a plurality of teeth formed on one side surface of a substantially straight back yoke, and a punched plate having a V-shaped notch provided between the teeth on the teeth side is laminated on the stator core. In the stator in which the coil is wound around the teeth portion, a thin piece is provided at the end of the insulating spool so as to protrude toward the V-shaped notch, and the stator core is bent from the notch. An electric motor characterized by using a stator in which the adjacent thin pieces overlap each other by forming an annular shape. 2. The electric motor according to claim 1, wherein a core mold is formed on the core portion instead of the spool as insulation of the stator core.