| 摘要 |
PROBLEM TO BE SOLVED: To provide a controller whose efficiency is not deteriorated while the controller is made to stably control a PM motor even when a DC voltage fluctuates. SOLUTION: A current command table 10A reduces a torque current command Iq* when a DC voltage drops from the rated value by setting the data of the table 10A so that the terminal voltage of a PM motor 2 may rise as the load of the motor 2 rises. In addition, the table 10A is constituted to limit the voltage of the motor 2 to the voltage Vmax which can be outputted from an inverter when the induced voltage of the motor 2 exceeds the voltage Vmax and corrects a magnetic flux current command Id * in accordance with the difference or ratio, when the DC voltage drops from a reference value. |
