Method for placing and securing magnets in a motor housing

Details Method for placing and securing magnets in a motor housing Method for placing and securing magnets in a motor housing

1978-09-06

1980-06-24

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

310 42, 310154, 310266, 310268, H02K 1502

Patent

active

042087848

ABSTRACT:
An improved technique for the assembly of motors of the type having a printed armature that rotates in a flat, annular air gap between a magnet assembly and a magnetic flux plate, wherein the size of the air gap is accurately maintained at preselected value. In one embodiment of the invention, a precision shim, having a thickness the same as the preselected air gap size, is placed on a flat work surface, the magnet assembly is placed on the shim, and a motor housing is placed over the magnet assembly and shim. An epoxy fill in the housing is compressed as the housing is pressed down over the magnet assembly until a reference surface on the housing contacts the work surface. In an alternate embodiment of the invention, an inner flux plate is formed to include a plurality of tines, so shaped and sized that, when the inner flux plate and the magnet assembly are bonded together and inserted in the housing, the tines provide for a force fit in the housing. The magnet assembly and inner flux plate are pressed into the housing by a press tool with lugs that project from a flat surface of the tool by a distance equal to the preselected size of the air gap.

REFERENCES:
patent: 3555651 (1971-01-01), Latussek et al.
patent: 3845339 (1974-10-01), Merkle et al.
patent: 4031610 (1977-06-01), Singh et al.

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