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Can a VFD run a wound-rotor motor?

Issue:
Wound-rotor motor

Product Line:
Altivar drives

Environment:
All models and serial numbers

Cause:
None
Resolution:
Altivar variable frequency drives may be used to operate wound-rotor motors.  Most wound-rotor motors are used where high starting torque is required so an Altivar 312, Altivar 32 or Altivar 71 drive would be most suitable for this application. 
The wound-rotor motors use resistor to connect the rotor windings.  The resistance can be adjusted to control the speed/torque characteristis of the motor. 
To use a variable frequency drive with a wound-rotor motor the resistors would need to be shorted. 
It is also recommended to use a dv/dt filter on the output of the drive to smooth the PWM.
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