| 摘要 |
PURPOSE:To allow an acceleration and a deceleration to accurately follow up command values by increasing the primary current command signal by the value corresponding to the acceleration at the accelerating time, and decreasing the primary current command signal by the value corresponding to the deceleration at the decelerating time. CONSTITUTION:State discriminating means 13 for discriminating whether an induction motor is during accelerating or decelerating by inputting a combination of a speed signal B and a speed deviation signal C is provided. Correcting means 14 is controlled by the output signal to obtain a corrected speed deviation signal C' by adding the signal C to the signal B in case of accelerating and subtracting the signal C by the signal B in case of decelerating. |
