Power Converter
AssigneeHitachi Industrial Equipment Systems Co., Ltd.
InventorsKazuaki TOBARI, Yoshiyuki TAGUCHI, Yuta IWASE
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Abstract
A power converter having a control unit that controls the output frequency, output voltage, and output current of the motor, wherein the control unit calculates a first torque current command from a deviation between a speed reference point and a speed estimate of the motor, The control unit switches the control mode to either a control mode that suppresses pulsation of the motor speed or a control mode that suppresses pulsation of the motor torque, and calculates a second torque current command from the first torque current command and the switched control mode.
Claims12
A power converter with a control unit that controls the output frequency, output voltage and output current of the motor, the control unit calculate the first torque current command from the deviation between the speed reference point and the speed estimate of the motor,
- switch the control mode to either a control mode that suppresses the pulsation of the speed of the motor or a control mode that suppresses the pulsation of the torque of the motor, and
- calculates a second torque current command from the first torque current command and the switched control mode.
Dependencies are inferred from the claim text.