Stepping motor having improved construction to reduce parts and

Details Stepping motor having improved construction to reduce parts and Stepping motor having improved construction to reduce parts and

1996-12-18

1998-05-05

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 42, 310179, 310180, 310194, 310259, H02K 3700, H02K 1500

Patent

active

057478970

ABSTRACT:
In a stepping motor, each of four integrally molded annular stators constituting two pairs has an annular plate having a central hole in which a magnet rotor is to be inserted, and pole teeth that form magnetic pole portions separated from the magnet rotor at a predetermined gap. The pole teeth of one annular stator of a given pair extend from the annular plate to be perpendicular to the other of the given pair, and are equidistantly arranged around the central hole to be shifted from the pole teeth of the other annular stator by a half pitch. Mounting holes are formed in each annular plate at predetermined spaces in the circumferential direction, and the mounting holes formed in the annular plates of given annular stators of different pairs that are arranged back to back are located at the same positions. Molded insulating films are formed on surfaces, which do not oppose the magnet rotor, of all the annular stators. The insulating films are coupled to each other through the mounting holes formed in the annular plates of the given annular stators. Excitation coils are wound on all the annular stators through the insulating films. A plate-like yoke has a major portion inserted between opposing surfaces of the annular plates adjacent to the outer circumferential surfaces of all the annular stators.

REFERENCES:
patent: 4127802 (1978-11-01), Johnson
patent: 4471246 (1984-09-01), Paillet
patent: 4884333 (1989-12-01), Cooper et al.
patent: 5121017 (1992-06-01), Yamamoto et al.
patent: 5187400 (1993-02-01), Kurata

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