Microprocessor based motor control

Details Microprocessor based motor control Microprocessor based motor control

1985-10-04

1986-12-09

Shoop, Jr., William M.

Electricity: motive power systems

Motor-reversing

Field circuit control

318434, 318490, 318569, 318332, H02P 728

Patent

active

046282335

ABSTRACT:
A microprocessor based motor controller which provides open loop speed control at low conduction angles, closed loop speed control at high conduction angles, and a smooth transition between open loop and closed loop zones. In open loop, the motor speed is selected and is permitted to vary with applied load. In closed loop, the motor speed is held constant, substantially irrespective of load. In the transition zone, the motor is operated in a hybrid open loop, closed loop fashion.
Anti-kickback protection is also provided based on a percentage change in the motor's rotational period.

REFERENCES:
patent: 4147966 (1979-04-01), Kain et al.
patent: 4307325 (1981-12-01), Saar
patent: 4417189 (1983-11-01), Overfield
patent: 4513381 (1985-04-01), Houser et al.
patent: 4550277 (1985-10-01), Carney

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