Stator for an electric polyphase motor

Details Stator for an electric polyphase motor Stator for an electric polyphase motor

1982-01-29

1984-08-21

Goldberg, Howard N.

Metal working

Method of mechanical manufacture

Electrical device making

310 42, 310 43, H02K 1514

Patent

active

044661827

ABSTRACT:
An improved stator for an electric polyphase motor, particularly a stepping motor, is disclosed. The stator includes a pole piece star having axially integral pole pieces arranged in star-like fashion around the hollow cylinder with the radial inner ends of the pole pieces located in the hollow cylinder and protruding a pre-determined small distance beyond the inner wall of the hollow cylinder. Thus, the hollow cylinder is set back from the radial inner edges of the pole pieces to provide minimum sized air gaps without requiring finishing operations on the cylinder after the motor is assembled. The radial outer ends of the pole pieces are welded to the surrounding ring housing by laser beam welding. The hollow cylinder is disclosed as an injection-molded part with the pole pieces molded therein simultaneous with the injection molding. A core mold for the cylinder is also disclosed.

REFERENCES:
patent: 2607816 (1952-08-01), Ryder et al.
patent: 2804680 (1957-09-01), Flagg, Jr.
patent: 3914859 (1975-10-01), Pierson

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