| 摘要 |
PURPOSE:To automatically output and set a slip frequency based on an accelera tion or deceleration time by vector-combining two current components separated from a primary current of an induction motor, and applying it to the motor to vector-controlling it. CONSTITUTION:A command value SR set by a speed setter 1 is compared with a speed feedback signal SF obtained by an F/V converter 18 for frequency/ voltage-converting a pulse train signal detected by a speed detector 19 mounted at an induction motor 18, a torque of the motor 18 is controlled by the deviation value to be speed-controlled. In this case, a torque current command (ITR) and a slip frequency command up proportional to the magnitude of the torque are detected based on the torque command value, and applied to a vector calculator 3. Further, the torque current command ITR and a magnetic flux current command IFR are set to the same value to accelerate or decelerate the motor. The result is fetched by the output signal omegar of the detector 19 to index a slip frequency omegas for mostly shortening the accelerating or decelerating time. The setting operation is automatically conducted. |
