| 摘要 |
PURPOSE:To share IM and SM only by simple changeover by obtaining the angle of rotation at the position of magnetic flux corresponding to sliding velocity and selectively adding the angle of the sliding rotation to the position of magnetic flux detected. CONSTITUTION:An inverter 2 is switching-driven according to PWM gate pulses given from a control board 101, and converts input DC power 3 into the ACs of fixed frequency and fixed voltage and outputs them. The control of an AC servomotor 1 variably controls the speed of the motor 1 at a desired value fundamentally, the actual speed of the motor 1 is detected for the control, and motor currents are controlled so as to bring the deviation of the actual speed of the motor 1 and a speed command value to zero. When the motor currents are controlled, motor currents are divided into a (d) axis component and a (q) axis component, and a voltage vector is selected in response to these components and the inverter 2 is driven. Accordingly, the position of the magnetic flux of the motor 1 is detected, and the current components of (d) and (q) axis are controlled in conformity with the detection. |
