| 摘要 |
PROBLEM TO BE SOLVED: To provide a synchronous motor control device capable of avoiding, without causing effect on cost and operation efficiency of a synchronous motor, a state in which a voltage of a DC link part connected in parallel to an inverter that supplies AC power to the synchronous motor becomes an excessive value, and capable of stopping the synchronous motor quickly and safely, without issuing an overvoltage alarm at the time of blackout of the AC power source.SOLUTION: A q-axis current command value setting part 12, when an AC power source 1 comes into blackout while a permanent magnet synchronous motor 5 is being driven, sets a q-axis current command value Ito be a q-axis current value I, and a d-axis current command value setting part 13, when the AC power source 1 comes into blackout while the permanent magnet synchronous motor 5 is being driven, sets a d-axis current command value Ito be a d-axis current value I. The q-axis current value Iand d-axis current value Iare set in such a manner that an absolute value of work rate per unit time of the permanent magnet synchronous motor 5 is equal to a loss per unit time of the permanent magnet synchronous motor 5. |
