Method and apparatus for controlling the magnetic flux of an induction motor
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United States of America Patent
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-
Sep 22, 1992
Grant Date -
N/A
app pub date -
Nov 17, 1989
filing date -
Mar 26, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to an induction motor magnetic flux operation method in a vector control device in which a primary current is supplied to the induction motor in response to an excitation current command value and a torque current command value and the frequency is controlled on the basis of the magnetic flux operated from the voltage and current applied on the motor, characterized in that, when the magnetic flux is operated on the basis of the voltage, current on the motor and a magnetic flux command signal by using a primary delay circuit, the time constant of the primary delay circuit is set equal to that of the secondary circuit of the motor. According to this invention, it is possible to minimize the phase error with respect to the true secondary magnetic flux included in the secondary magnetic flux value, which leads to an accurate torque control.
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