CONTROL APPARATUS FOR AC MOTOR
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Accused Products
Abstract
A control apparatus for an AC motor that drives and controls the AC motor includes a damping control unit that calculates a damping manipulated variable that suppresses a fluctuation in the capacitor voltage, wherein the damping control unit calculates a fluctuation rate of the capacitor voltage, calculates the damping manipulated variable based on the fluctuation rate and a predetermined value that is set as a value in a predetermined range around a maximum torque of the AC motor, generates a torque command or a current command of the AC motor based on the damping manipulated variable, and controls an inverter so as to change a current flowing in the inverter in a fluctuation suppressing direction with respect to a fluctuation in the capacitor voltage based on the torque command or the current command.
11 Citations
13 Claims
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1-7. -7. (canceled)
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8. A control apparatus for an AC motor that drives and controls the AC motor via an inverter that includes an LC filter circuit, which includes a reactor and a capacitor, on a DC power supply side and converts a capacitor voltage to an AC voltage, the apparatus comprising a damping control unit that calculates a fluctuation rate of the capacitor voltage and calculates a damping manipulated variable that suppresses a fluctuation in the capacitor voltage based on a value obtained by subtracting a preset predetermined value from a product of a signal that is a square of the fluctuation rate and the predetermined value, wherein
a torque command or a current command of the AC motor is generated based on the damping manipulated variable, and the inverter is controlled based on the torque command or the current command.
Specification