Motor speed control system

Details Motor speed control system Motor speed control system

1977-09-13

1979-07-10

Rubinson, Gene Z.

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

318313, 356398, H02P 534

Patent

active

041609395

ABSTRACT:
A motor speed control system for reducing instantaneous speed variations as a result of hunting in hysteresis synchronous motors utilized to drive optical scanners by controlling the frequency of the drive signal applied to the motor. A laser beam is reflected from the facets of the optical scanner and scans a surface along a scan line, a signal being generated at the start and end of each scan line. A counter is driven by an accurate clock which is started and stopped in accordance with the start and end of scan signals. The resulting count of the counter is thus inversely proportional to the speed of the motor and is converted to an analog input signal and coupled to a voltage controlled oscillator whose frequency is controlled for driving the motor such that undesirable oscillations of the motor are damped out. Additional embodiments for controlling the motor speed are disclosed which utilize only the start of scan signal to both start and stop the counter.

REFERENCES:
patent: 3609488 (1970-03-01), Sampson et al.
patent: 3692414 (1972-09-01), Hosterman et al.

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