| 摘要 |
PROBLEM TO BE SOLVED: To reduce the influence of a harmonic wave in an overmodulation drive region at the time of the feedback current control. SOLUTION: In the controller of a current control inverter 2 by which the primary current of an induction motor is divided into an excitation current and a torque current and controlled, if the output of the inverter 2 is saturated, an excitation current iγs' and a torque current iδs' which are obtained by removing harmonic components corresponding to a primary frequency ω from an excitation current iγs and a torque current iδs which are in accordance with the output of a current detection unit 25 are calculated by a filter arithmetic unit 22. In accordance with the calculated excitation current iγs* and torque current iδs' and an excitation current instruction value iγs* and a torque current instruction value iδs* which are calculated by a vector control instruction value arithmetic unit 11, an excitation voltage instruction value Vγs* and a torque voltage instruction value Vδs* are calculated by a current control unit 21 and the inverter 2 is controlled in accordance with the excitation voltage instruction value Vγs* and the torque voltage instruction value Vδs*. |
