| 摘要 |
<P>PROBLEM TO BE SOLVED: To more properly determine whether the demagnetization occurs in a rotor of a three-phase AC motor. <P>SOLUTION: A target current Iq* of a q axis is applied to a map showing relation between the target current Iq* of a q axis and a temporary voltage Vqtmp of the q axis, to set the temporary voltage Vqtmp of the q axis. An estimated voltage Vqest, estimated as a voltage of the q axis, when controlling an inverter in a state in which demagnetization has not occurred in a permanent magnet of the rotor of a motor, is set, by applying a correction, according to drive status (power drive or regenerative drive) of the motor to the temporary voltage Vqtmp of the q axis. Whether the demagnetization occurs in the permanent magnet of the rotor, is determined based on comparison in magnitude of a demagnetization factor of the permanent magnet of the rotor obtained from the estimated voltage Vqest of the q axis which is set, and a voltage command Vq* of the q axis, and a determination threshold according to drive status (power drive or regenerative drive) of the motor. As a result, the determination can be performed more appropriately according to drive status (power drive or regenerative drive) of the motor. <P>COPYRIGHT: (C)2011,JPO&INPIT |
