| 摘要 |
A current vector that flows in a three-phase alternating-current motor (10) is set in a fixed direction with respect to a zero vector current in an alphabeta coordinate system according to an applied voltage for each of six non-zero vector switching modes of an inverter (12). Among those current vectors, a current vector that is closest to an instructed current value is identified. Then, only a non-zero vector current that is to flow when the inverter (12) is operated in a non-zero vector switching mode which corresponds to the identified current vector is calculated. |
