For constant torque drive which speed control method is preferred ?
Correct answer: B. Armature voltage control
- A. Field control
- B. Armature voltage control
- C. Shunt armature control
- D. Mechanical loading system
Explanation
Armature-voltage control changes speed while keeping the field flux nearly constant, so motor torque can remain constant over the control range. Field control is mainly used for speeds above base speed and gives a weakening-flux characteristic.
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