| 摘要 |
PURPOSE:To improve the responsiveness of a constant current control loop of an inverter controller by correcting a reference slip frequency in response to a deviation between the average value of respective inverter output currents and current instruction value, and correcting a reference modulation factor in response to a deviation between the current instruction value and the respective inverter output current. CONSTITUTION:A current instruction arithmetic unit 23 calculates a currrent command Ic in response to a notch command, a master computer command MC and a response load signal VL, and a slip frequency arithmetic unit 24 calculates a reference slip frequency fso in response to the current command Ic. A correcting slip frequency arithmetic unit 31 calculates a correcting slip frequency fsl in response to a deviation between a motor current average value IMAV and the command Ic. A modulation factor arithmetic unit 32 outputs a reference modulation factor r0 in response to an inverter frequency (f) and a filter capacitor voltage Ec, and correcting modulation factor arithmetic units 33, 34 respectively output correcting modulation factors r10, r20 in response to deviations between the value Ic and motor currents IM1, IM2. |
