Method and circuit for feeding a single-phase stepping motor

Details Method and circuit for feeding a single-phase stepping motor Method and circuit for feeding a single-phase stepping motor

1991-02-11

1992-11-24

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

G05B 1940

Patent

active

051665905

ABSTRACT:
The method and circuit are particularly suitable for use in timepieces and are adapted to supply the motor with chopped-voltage pulses of variable durations as a function of the load conditions of the motor. A chopped pulse of variable duration T.sub.7 is composed of a partial pulse T.sub.4 of fixed duration and of a constant number of partial pulses T.sub.6i of variable duration, spaced by intervals T.sub.5i which are themselves determined by the duration of current drop between the preceding peak and a reference value. The durations T.sub.6i are proportional to the intervals T.sub.5i.

REFERENCES:
patent: 3364413 (1968-01-01), Abraham
patent: 3969642 (1976-07-01), Yoshino
patent: 4361410 (1982-11-01), Nakajima et al.
patent: 4439717 (1984-05-01), Berney
patent: 4516064 (1985-05-01), Oudet et al.
patent: 4542329 (1985-09-01), Tu Xuan

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