The magnitude of field flux in a 3-phase synchronous motor?
Correct answer: D. remains constant at all loads
- A. varies with power factor
- B. varies with speed
- C. varies with the load
- D. remains constant at all loads
Explanation
With constant d.c. field excitation, the rotor field flux of a synchronous motor is essentially fixed as load changes; load mainly changes the load angle and armature reaction. Hence the field flux is treated as constant at all loads.
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