Current controlled motor drive circuit

Details Current controlled motor drive circuit Current controlled motor drive circuit

1984-12-07

1986-03-04

Shoop, Jr., William M.

Electricity: motive power systems

Open-loop stepping motor control systems

318685, H02P 800

Patent

active

045742286

ABSTRACT:
A switching regulator causes a supply voltage to be intermittently chopped to provide energy pulses in a lowpass filter circuit. The lowpass filter circuit includes a capacitor which is being charged by the chopped energy pulses and whose output is used to drive a low voltage stepper motor. The duty cycle of the energy pulses is a function of the average value of the stepper motor coil current. By correlating the duty cycle of the energy pulses with the average current in the motor coil a relatively high torque is provided to drive the motor during a startup phase and is automatically adjusted to meet the running requirements of the particular stepper motor.

REFERENCES:
patent: 3742330 (1973-06-01), Hodger et al.
patent: 4431955 (1984-02-01), Faedi et al.

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