| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control device and a control method of an AC motor, capable of suppressing/removing current offset by controlling a voltage waveform by detecting the current offset in the operation state of an AC motor which performs phase control of voltage. <P>SOLUTION: A control device 1 of an AC motor controls a voltage waveform by considering a current offset amount of an AC motor 9 equipped with current detection means 97U-97W and phase detection means 95. The control device includes: means 12 for setting a voltage phase θv on the basis of a torque command value Treq; means 11 for detecting offset amounts IU0, IV0, and IW0 from respective phase currents iu-iw; means 13 to provide timing tmg for switching/controlling the voltage waveform between a pulse width modulation waveform pwm and a square waveform at each half period of an electrical angle; and means 16 for switching between the pulse width modulation waveform pwm and the square waveform at each half period according to positive/negative of the offset amounts IU0, IV0, and IW0. <P>COPYRIGHT: (C)2013,JPO&INPIT |
