| 摘要 |
PURPOSE:To control to response at a high speed without using a speed detector by obtaining 2-phase components from a detected voltage for exciting current phase reference, and providing the primary delay time corresponding to the control delay of a speed control system for the speed command signal. CONSTITUTION:A voltage component detector 7 detects a 90 deg. phase difference component with respect to the exciting current component determined by a control system to be the basic wave component of a motor voltage. A voltage component detector 8 detects the same phase component for the exciting current phase reference signal of the motor voltage. A torque current i*t is controlled in response to a deviation between the speed command signal omega*r and the addition of 90 deg. phase difference component and a slip frequency. The primary delay circuit 4 outputs a 2-phase sinusoidal wave signal having a frequency proportional to the frequency command signal of a frequency converter from an oscillator 10 in response to the deviation between a signal having the primary delay time corresponding to the control delay of a speed control system to a speed command signal and the same phase voltage component. |
