Stepping motor, method of driving the same and drive circuit the

Details Stepping motor, method of driving the same and drive circuit the Stepping motor, method of driving the same and drive circuit the

1987-07-17

1989-02-07

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 310268, H02K 3708

Patent

active

048033898

ABSTRACT:
A stepping motor includes a first element including at least two permanent magnets each having a pair of N and S poles and a second element including a yoke arranged to be separated from the first element by a predetermined interval. The first and second elements can be moved relative to each other. The second element has a two-phase coil arranged on the yoke in association with a width of each pole in a moving direction of the permanent magnet and detent torque generating means for generating a static detent torque by relative movement. The detent torque generating means is arranged on the yoke such that a stable position of one of the first and second elements moved by a dynamic torque generated when one of the coils constituting the two-phase coil is energized is deviated from a stable position of a moving element caused by a detent torque generated from the detent torque generating means. A method of controlling the stepping motor is also disclosed.

REFERENCES:
patent: 4115714 (1978-09-01), Ingenito et al.
patent: 4532447 (1985-07-01), Cibic
patent: 4658162 (1987-04-01), Koyama et al.
patent: 4680494 (1987-07-01), Grosjean
Machine Design, Nov. 26, 1970 pp. 84-87 "Rotation by the Digits with Permanent-Magnet Stepper Motors".

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