| 摘要 |
PURPOSE:To decrease the rotating pulsation even at a low speed rotation time and to reduce the variation in the rotating speed at the abrupt load varying time of an induction motor by interposing a phase advancing circuit at the output side of a speed regulator. CONSTITUTION:A phase advancing circuit 11 is inserted and connected between a speed regulator 2, an absolute value corresponding circuit 3 and an amplifier 4. The circuit 11 receives the output signal Et of the regulator 2 to perform the prescribed phase advancing and amplifying actions determined by the circuit constants to output an improved torque command signal E't. Thus, since the phase characteristics of the entire control system can be improved, the amplification factor in the proportional integration characteristic of the regulator can be increase, the integrating time constant can be reduced, thereby sufficiently amplifying even ultrafine rotating speed signal at the low speed rotation time, and the folding angle frequency in the frequency characteristic of the entire control system can be increased. |
