System and method for fast start-up of an induction motor
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United States of America Patent
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Apr 16, 2013
Grant Date -
Oct 11, 2012
app pub date -
Apr 11, 2011
filing date -
Apr 11, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A system for controlling operation of a motor drive during fast start-up of an induction motor is disclosed. The system includes an AC motor drive having a PWM inverter and a control system to generate a command signal to cause the PWM inverter to control an output of the AC motor drive. The control system includes a start-up modulator that is selectively operable during start-up acceleration of the AC motor, the start-up modulator programmed to determine a motor current applied to the AC motor and a voltage of a DC bus, generate a first frequency offset that causes a frequency reference of the command signal to be decreased when the motor current is greater than a reference current threshold, and generate a second frequency offset that causes the frequency reference of the command signal to be increased when the DC bus voltage is greater than a reference voltage threshold.
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