| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce torque ripples in a three-phase alternating-current motor and enhance the motor efficiency thereof. <P>SOLUTION: Fundamental voltage command values Vd*, Vq* corresponding to fundamental current command values Id*, Iq* are generated and harmonic voltage command values Vnd*, Vnq* corresponding to harmonic current command values Ind*, Inq* are generated. The harmonic voltage command values Vnd*, Vnq* are respectively added to the fundamental voltage command values Vd*, Vq* and motor current is generated according to the results of the additions. An amplitude/phase detection unit 45 detects the amplitude Indq and phase ϕ of the harmonic component of the motor current. When the phase ϕ deviates from a phase condition determined according to the amplitude Indq, an operation mode change unit 46 changes the operation mode so that harmonic voltage command values are not added to the fundamental voltage command values Vd*, Vq*. <P>COPYRIGHT: (C)2010,JPO&INPIT |
