Inverter device
AssigneeKabushiki Kaisha Yaskawa Denki
InventorsHideaki Iura, Masanobu Inazumi
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Abstract
This invention provides an inverter device that can detect a step-out state of an AC motor by a simple process without depending on a rotation speed of the AC motor and also surely hold an abnormal state in the step-out state of the AC motor. The inverter device 1 includes a torque current control unit 6 for controlling a torque current direction voltage so that a given torque current command value coincides with a torque current detection value, and a V/f conversion unit 7 for calculating an induced voltage command of the AC motor 2 based on a given output frequency command. The inverter device further includes a step-out detection unit 10 for detecting a step-out state of the AC motor 2 based on the torque current direction voltage and the induced voltage command.
Claims5
An inverter device that drives an AC motor without a position detector or a speed detector of a rotor, the inverter device comprising:
- a torque current control unit for controlling a torque current direction voltage so that a given torque current command value coincides with a torque current detection value;
- a V/f conversion unit for calculating an induced voltage command of the AC motor based on a given output frequency command;
- and
- a step-out detection unit for detecting a step-out state of the AC motor based on the torque current direction voltage and the induced voltage command.
An inverter device that drives an AC motor without a position detector or a speed detector of a rotor, the inverter device comprising:
- an exciting current control unit for controlling an exciting current direction voltage so that a given exciting current command value coincides with an exciting current detection value;
- a V/f conversion unit for calculating an induced voltage command of the AC motor based on a given output frequency command;
- and
- a step-out detection unit for detecting a step-out state of the AC motor based on the exciting current direction voltage and the induced voltage command.
Dependencies are inferred from the claim text.