Control circuit for a permanent magnet or constant excitation direct current motor, particularly for washing machines
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United States of America Patent
Stats
-
Oct 23, 1990
Grant Date -
N/A
app pub date -
Mar 3, 1989
filing date -
Mar 4, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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