| 摘要 |
PURPOSE:To improve efficiency while removing the state, in which positions cannot be detected, by preparing the quantity of phase corrected determined by quantity regarding currents flowing through a motor and changing the phase of a position detecting signal only by the quantity of phase corrected in response to quantity regarding currents flowing through the motor. CONSTITUTION:A position detecting-signal correction circuit 13 is added to a back electromotive voltage position detecting circuit 12 connected on the output side of an inverter 4. The position detecting-signal correction circuit 13 prepares the quantity of phase corrected determined by quantity regarding currents flowing through a motor from the inverter 4, and changes the phase of a position detecting signal detected by the position detecting circuit 12 only by the quantity of phase corrected in response to quantity regarding currents flowing through the motor. |
