AC Motor speed control apparatus
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United States of America Patent
Stats
-
Mar 11, 1986
Grant Date -
N/A
app pub date -
Jun 7, 1982
filing date -
Jun 9, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for detecting the speed of an AC motor such a synchronous motor or induction motor of the type in which a pulse generator is connected to the shaft of the motor for producing pulses indicative of the motor speed. The motor speed is detected by counting clock pulses whenever the pulses are generated by the pulse generator. Provided are speed computing means responsive to an interrupt pulse of a constant period for estimating the present actual speed of the motor, at times between pulses from the pulse generator, on the basis of the magnitude of a previously commanded armature voltage, magnitude of past and present armature current and a past detected speed, in accordance with the characteristics of the motor. The estimated speed is taken as the detected speed to enable the speed of the motor to be detected with improved accuracy.
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