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Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature
Motor torque compensation of an induction electric motor by adjusting a slip command during periods of supposed change in motor temperature
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机译:在假定的电机温度变化期间,通过调节滑差指令来补偿感应电动机的电动机转矩
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摘要
The present invention maintains constant torque in an inverter driven AC induction motor during variations in rotor temperature. It is known that the torque output of a given AC induction motor is dependent upon rotor temperature. At rotor temperatures higher than the nominal operating condition the rotor impedance increases, reducing the rotor current and motor torque. In a similar fashion, the rotor impedance is reduced resulting in increased rotor current and motor torque when the rotor temperature is lower than the nominal operating condition. The present invention monitors the bus current from the DC supply to the inverter and adjusts the slip frequency of the inverter drive to maintain a constant motor torque. This adjustment is based upon whether predetermined conditions implying increased rotor temperature or decreased rotor temperature exist for longer that a predetermined interval of time.
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