JP3702557B2 - Resin mold motor and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin molded motor in which a bearing bracket used in various electric devices is securely locked to a stator.
[0002]
[Prior art]
A conventional molded motor will be described with reference to FIG.
[0003]
Conventionally, a stator assembly 5 formed of a core composed of a yoke core 2 fitted to the stator core 1 and a winding frame 4 around which a coil 3 is wound is coated on the outer periphery by integral molding of an insulating resin body 6. The bearing bracket 9 is press-fitted and fixed to both sides of the center opening 8 of the formed mold assembly 7 and the rotor 10 is pivotally supported.
[0004]
[Problems to be solved by the invention]
However, in the above conventional configuration, when the outer periphery is formed by integral molding of the insulating resin body 6, there is a gap between the wall of the winding frame 4 and the outer diameter of the mold center. When injecting, a great injection pressure is applied to the wall surface of the winding frame 4, and the winding frame 4 falls down, the coil 3 wound around this protrudes outside the resin whose outer periphery is formed, or the coil 3 is disconnected. It had the problem of being easy.
[0005]
The present invention eliminates the above-mentioned conventional problems, and in a molded motor in which the outer periphery is formed by integral molding of an insulating resin, the outer side of the resin in which the outer periphery of the winding frame falls and the coil wound around this is coated It is an object of the present invention to provide a highly reliable molded motor that eliminates the problem of overhanging or disconnecting a coil and that reliably holds a bearing bracket.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention injects an insulating resin with the inner wall surface of the winding frame held at the center of the mold when the outer periphery of the stator assembly is formed by integral molding of the insulating resin. A bearing bracket that is molded and provided with a plurality of protruding pieces for locking on the outer periphery is configured to be press-fitted into the inner wall surface of the winding frame of the opening of the stator assembly.
[0007]
As a result, it is possible to obtain a highly reliable molded motor that prevents the winding frame from collapsing, coil disturbance, and disconnection, and that reliably holds the bearing bracket.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention, as in the first aspect of the present invention, is formed by a core composed of a stator core and a yoke core fitted to the stator core, and four winding frames wound around the coil and disposed at 90 ° relative positions. It can be realized by pressing a metal material from the inside on both sides of the center opening of the stator assembly and fixing a bearing bracket having a plurality of projecting pieces on the outer periphery for locking. .
[0009]
And according to the above-mentioned structure, the fall of a winding frame, the disorder of a coil, generation | occurrence | production of a disconnection is prevented, and the reliability which hold | maintains a bearing bracket reliably is high.
[0010]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to FIG.
[0011]
FIG. 1 is a view showing a cross section of a molded motor in one embodiment of the present invention. In FIG. 1, the same components as those in the conventional example shown in FIG.
[0012]
In FIG. 1, winding coils 4 (not shown) and winding frames 4 around which coils 3 are wound are disposed at four positions of the field pole portion of the yoke core 2 at 90 ° relative positions. The core is composed of a yoke core 2 and a stator core 1 fitted thereto. The stator assembly 5 having the above structure is formed by coating the outer periphery by integral molding of the insulating resin body 6. The bearing bracket 9 provided with a plurality of projecting pieces 11 for locking on the outer periphery is press-fitted into the inner wall surface 4 a of the winding frame 4 of the openings 5 a and 5 b of the stator assembly 5, and is accommodated in the bearing bracket 9. The shaft of the rotor 10 is received by the bearing 12. Therefore, the winding frame 4 is not tilted by the stator assembly 5 and the insulating resin body 6, the disconnection of the coil 3 can be prevented, and the bearing bracket 9 can be reliably held at a predetermined position by the projecting piece 11.
[0013]
【The invention's effect】
As described above, according to the present invention, it is possible to obtain a highly reliable molded motor that prevents the winding frame from falling, the coil from being disturbed, and the occurrence of disconnection, and that reliably holds the bearing bracket.
[Brief description of the drawings]
FIG. 1 is a sectional view of a molded motor according to an embodiment of the present invention. FIG. 2 is a sectional view of a conventional molded motor.
DESCRIPTION OF SYMBOLS 1 Stator core 2 Yoke core 3 Coil 4 Winding frame 4a Inner wall surface 5 Stator assembly 5a, 5b Opening 6 Insulating resin body 9 Bearing bracket 11 Projection piece

Claims (2)

A stator assembly comprising a stator core and a core composed of a yoke core fitted to the stator core and a winding frame on which a coil disposed on the yoke core is wound is provided, and the outer periphery of the stator assembly is insulated. When the cover is formed by integral molding of the resin, the insulating resin is injection-molded with the inner wall surface of the reel frame held at the center of the mold, the center of the mold is removed, and then the outer periphery is engaged. A resin-molded motor characterized by press-fitting a metal bearing bracket having a plurality of projecting pieces provided by pressing from the inside to stop the inner wall surface of the winding frame of the opening of the stator assembly . Manufacturing method .   An outer periphery of a stator assembly formed by a stator core and a core composed of a yoke core fitted to the stator core, and four winding frames wound around the coil and disposed at 90 ° relative positions is integrated with an insulating resin. When forming the coating by molding, the insulating resin is injection molded in a state where the inner wall surface of the reel is held at the center of the mold, and after the center of the mold is removed, it is locked to the outer periphery. A method of manufacturing a resin mold motor, comprising: press-fitting a metal bearing bracket having a plurality of projecting pieces provided by pressing from the inside into an inner wall surface of a winding frame of an opening of the stator assembly.

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