To obtain the maximum efficiency drive of a permanent magnet motor by identifying a motor constant, in a device to drive a permanent magnet motor without using a position sensor.
A motor drive device has a permanent magnet synchronous motor, an inverter to operate the motor, a current detector to detect current flowing into the motor, and an inverter control means to position-sensorless-drive using a current detected by the current detector without detecting the rotor position of the motor. The motor is sensorlessly driven with high efficiency by having a function to identify the motor constant of the permanent magnet motor with an inverter control means, by having a motor output calculation means to calculate the output of the motor based on the motor constant identified with the inverter control means, and by providing an adjustment means to adjust the output from the inverter corresponding to the calculation result of the output calculation means.
COPYRIGHT: (C)2003,JPO
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