| 摘要 |
PURPOSE:To control a control leading angle capable of operating stably without commutation failure even if a motor is abruptly accelerated or decelerated by deciding the superposing angle in response to the magnitude of the acceleration or deceleration rate of a reference speed and controlling the control leading angle. CONSTITUTION:An acceleration/deceleration rate detector 25 changes a switch 27 when the acceleration/deceleration rate becomes the prescribed value or higher than the detected speed by a speed detector 24, inputs the prescribed superposing angle (u) set by a superposing angle setter 26 to a control leading angle controller 21, thereby controlling a control leading angle (beta). When the rate is reduced to decrease the current, the switch 27 is reset by the current detected by a current detector 20 of another input of the detector 25, and the control leading angle (beta) is controlled by a value obtained by a superposing leading detector 23. |
