A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?
Correct answer: B. stator supply is not required to produce magnetic field
- A. synchronous motor has no slip
- B. stator supply is not required to produce magnetic field
- C. mechanical load on the rotor remains constant
- D. synchronous motor has large airgap
Explanation
The synchronous motor obtains its rotor magnetic field from DC excitation, so the stator does not need to supply the full magnetizing current required by an induction motor. Its excitation can therefore be adjusted to obtain unity or even leading power factor.
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