| 摘要 |
PURPOSE:To control an AC motor under an optimum current control even if a supply voltage of an inverter is different. CONSTITUTION:Gains K1, K2 of current loops 2R-2T are set based on a supply voltage Vs of an inverter to become a reference. Even if a supply voltage Vcc is different from the reference voltage Vs, a Vcp (=Vs/Vcc) is multiplied by a PWM command to be output from a current loop to obtain an optimum gain of the current loop. A phase advancing amount by a phase correcting circuit 1 is phase advancing-controlled by obtaining an optimum phase advancing amount based on the supply voltage. Thus, an AC motor can be optimally controlled without reducing characteristics of a control system. |
