H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/20
H02P 8/00 (2006.01) H02P 8/12 (2006.01)
Patent
CA 1212412
ABSTRACT OF DISCLOSURE A stepper motor control circuit includes a waveform generator circuit which produces two identical substantially stepless symmetrical waveforms (preferably of triangular configuration) at a frequency which can be varied on demand. Each waveform is used as a current demand signal for a pulse width modulator with a push-pull output stage controlling current in the motor windings . The pulse width modulator runs at a fixed frequency an order of magnitude higher than the maximum required stepping frequency. A current sensing resistor provides a feedback signal which is fed back to input of the modulator to balance the demand signal.
420712
Lucas Industries Public Limited Company
Marks & Clerk
LandOfFree
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