| 摘要 |
PURPOSE:To correct the slip frequency even at low speed time including zero speed by correcting the slip by an exciting current component. CONSTITUTION:A current detector 14 obtain a torque current component it' and an exciting current component im' from the primary current i1, and a voltage detector 19 obtains a reactive voltage component eq from a voltage detection value v1. A current vector calculator 8 outputs the primary current command i1* in response to an exciting current command im* and a deviation between a torque current command it* and torque current component it'. A pulse width modulation controller 7 controls an inverter 2 in response to a deviation between the primary current command i1* and the primary current i1. A multiplier 23 multiplies the deviation between the command im* and the component im' by a slip frequency command Ws and outputs a slip frequency correction signal DELTAWs. |
