Control circuit for a permanent magnet or constant excitation di

Details Control circuit for a permanent magnet or constant excitation di Control circuit for a permanent magnet or constant excitation di

1989-03-03

1990-10-23

Shoop,, Jr.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388915, 318799, H02P 500

Patent

active

049658484

ABSTRACT:
A motor control circuit measures the motor voltage to determine actual motor speed. This speed voltage is the sum of the back emf and armature loses. The control circuit receives a reference voltage proportional to the desired motor speed and a further signal voltage indicative of the motor armature losses. These three voltages are combined to provide a first error signal representing the difference between the reference voltage and the motor back emf. This error signal is substractively combined with a signal representative of the motor power to produce a control signal for a modulator circuit which in turn controls a semiconductor switch in series with the motor.

REFERENCES:
patent: 3943420 (1974-07-01), Hind
patent: 4001666 (1977-01-01), Grenfell
patent: 4513231 (1983-02-01), Kuno et al.
patent: 4578626 (1985-03-01), Richter
patent: 4723219 (1988-02-01), Beyer et al.
patent: 4749927 (1986-04-01), Rodel et al.

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