Electric rotary drive apparatus operable in a magnetic cylinder

Details Electric rotary drive apparatus operable in a magnetic cylinder Electric rotary drive apparatus operable in a magnetic cylinder

1985-08-19

1987-02-17

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 40MM, 310156, 335272, H02K 3312

Patent

active

046442111

ABSTRACT:
A rotary drive apparatus includes: a bar yoke, a coil mounted on the bar yoke, and a cylindrical case, having a magnetic property for receiving the coil and the bar yoke therein. The cylindrical case has at least one salient-pole portion formed on the inside thereof in the vicinity of a portion where the coil is received. The rotary drive apparatus also includes a rotary member facing the salient-pole portion and spaced from the bar yoke and the salient-pole portion by a predetermined gap, so that the rotary member rotates between the bar yoke and the salient-pole portion, and is provided with at least one magnet having opposite magnetic polarities and arranged along the circumference of the rotary member and facing the salient-pole portion. The salient-pole portion, the magnet, and an end-of-the-yoke member form a magnetic circuit. The rotary member is rotated in response to magnetic flux generated at the end of the bar yoke by applying an electric current to the coil.

REFERENCES:
patent: 2595870 (1952-05-01), Morganson
patent: 2812457 (1957-11-01), Crawford
patent: 4527676 (1985-07-01), Emura et al.
patent: 4538080 (1985-08-01), England
Lutz et al, "Low Inertia Stepper Motor, " IBM Tech. Disclosure Bulletin, vol. 20, No. 6, (Nov. 77), p. 2262.

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