| 摘要 |
PURPOSE:To control torque generated at high accuracy while reducing the components of the pulsation of torque, by mounting an electromotive force computing element and a magnetic flux computing element to a control circuit of an alternating current motor, to which armature currents are fed through a rectifying valve. CONSTITUTION:The terminal voltage of the motor of an alternating current motors 20, to which armature currents are supplied through a rectifying valve 16, and armature currents are sent to an electromotive force computing circuit 40, magnetic flux is calculated by means of a magnetic flux computing element 42 from the electromotive force and magnetic flux is phase shited at angle of 90 deg. by means of a vector rotary instrument 44. The magnetic flux is rectified synchronizing with the control signals of the rectifying valve 16, effective magnetic flux is detected, current command value is computed from the effective magnetic flux and torque command value 34 and armature currents are controlled in accordance with the value. Thus, torque generated can be controlled at high accuracy while a pulsation portion contained in the torque generated can be reduced not more than tolerance limits, and the torque generated can be changed into smooth drive characteristic. |
