| 摘要 |
PURPOSE:To bring the actual slip frequency at accelerating and decelerating times into coincidence with a calculated value by correcting the varying amount of a rotating speed from the instant when a speed detection signal is input to a microcomputer to the instant when a control signal is applied to an inverter. CONSTITUTION:The output signal 7a of a speed detector 7 is differentiated by a differentiation calculator 36, and the differentiation output signal 36a is added by an adder 37 with the output signal 7a. After this addition signal is added by an adder 35 with the output signal from a slip frequency calculator 34, it is output as a frequency command 20a. Thus, the calculators 36, 37 are newly added, and a control signal is output to an inverter 4 by correcting with the varying amount of the rotating speed of an induction motor 6 from when the output signal of the detector 7 is input to gas microcomputer 13 to the time when a control signal for varying the frequency is applied to the inverter 4. |
