| 摘要 |
Proposed is a control technique for a synchronous motor that can set an instruction value of an applied voltage in consideration of a response delay of a current. An applied-voltage electrical angle setting method according to the proposal includes detecting an applied voltage and a current of the synchronous motor M, calculating a current peak value Ip based on the detected values while calculating a present applied voltage phase ±, calculating a target current phase ²targ based on the current peak value Ip followed by calculating a target applied voltage phase ±targ corresponding to the target current phase in a target value setting unit 20, and calculating a new applied voltage electrical angle instruction value ¸vtarg, based on a change angle ”¸v obtained by correcting a difference between the present applied voltage phase ± and the target applied voltage phase ±targ by a response time constant L/R of the synchronous motor, a rotational speed É calculated based on the applied voltage and the current, and the previous applied voltage electrical angle instruction value ¸vtarg, in a voltage electrical angle instruction value setting unit 10. |
