Method and arrangement in connection with motor fed with frequency converter provided with intermediate voltage circuit
AssigneeABB AB
InventorErkki Miettinen
Life of this patent
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Abstract
Method and arrangement in connection with a motor fed with a frequency converter provided with an intermediate voltage circuit. The method comprises steps of feeding motor voltage to the motor along a motor cable with a frequency converter for controlling the motor, rectifying the voltage of the motor cable and restricting the magnitude of the voltage of the motor cable at the end of the motor cable on the side of the motor with a clipper circuit coupled in parallel with the motor, using the rectified voltage for rotating one or more cooling fans of the motor.
Claims20
A method in connection with a motor fed with a frequency converter provided with an intermediate voltage circuit, wherein the method comprises the steps of
- feeding motor voltage to the motor with the frequency converter along a motor cable for controlling the motor;
- rectifying the voltage of the motor cable and restricting the magnitude of the motor cable voltage at the motor cable end on the motor side with a clipper circuit coupled in parallel with the motor;
- using the rectified voltage for rotating one or more cooling fans of the motor.
An arrangement in connection with a motor fed with a frequency converter provided with an intermediate voltage circuit, wherein the arrangement comprises a clipper circuit coupled to the motor cable end on the motor side in parallel with the motor for producing a rectified voltage and for clipping excess voltages of the motor cable;
- one or more cooling fans for the motor;
- and
- means for feeding the rectified voltage to the cooling fan motor.
Dependencies are inferred from the claim text.