Movement detector for a stepping motor
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United States of America Patent
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Apr 6, 1982
Grant Date -
N/A
app pub date -
Aug 27, 1980
filing date -
Sep 4, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention provides a feed arrangement for a stepping motor which enables step detection and responsive to failure to step applies a series of wide (long duration) pulses in place of the normal short duration pulses. The detector includes sampling means for a first signal developed by the voltage induced in the motor winding during a predetermined period and there are means to generate a second signal which is the integral of the first signal, the amplitude of the second signal indicating whether or not the motor has stepped. The invention may find use with a timepiece micromotor.
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