Induction motor control system
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United States of America Patent
Stats
-
Aug 2, 1994
Grant Date -
N/A
app pub date -
Oct 30, 1981
filing date -
Oct 30, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Speed control of an induction motor is effected in digital fashion through use of a computer but without complex processing, and with a computer that need not be large in scale. This is accomplished by processing at least a speed command signal, actual speed signal and torque signal in analog fashion, enabling simplification of an induction motor speed control digital processing section which performs all other control operations in a digital manner. In a speed control network having a closed loop, a frequency-to-voltage converter, adder-subtractor, proportional integrator, polarity determining circuit absolute value circuit and voltage-to-frequency converter are constructed of circuitry operable on the basis of analog values, with all other circuits being constructed of circuitry operable on the basis of digital values.
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