AC rotary machine constant measuring apparatus for measuring constants of stationary AC rotary machine
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United States of America Patent
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Sep 9, 2008
Grant Date -
Jan 24, 2008
app pub date -
Dec 28, 2004
filing date -
Jul 21, 2004
priority date (Note) -
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Abstract
In an apparatus measuring constants of an induction motor, an inverter converts an inputted voltage command signal into a single-phase AC power and feeds the single-phase AC power to the induction motor, and a currert detector detects a current of the single-phase AC power fed to the induction motor. An apparatus controller generates a voltage command signal corresponding to an AC voltage as applied to the induction motor and outputs the voltage command signal to the inverter and gerates the voltage command signal and controls the inverter to feed the single-phase AC power having a frequency selected in a range equal to or higher than 0.006 Hz and equal to or lower than 1.5 Hz to the induction motor. A constant calculation controller calculates constants of the induction motor based on the voltage and current of the single-phase AC power fed to the induction motor.
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