Question
Download Solution PDFWhich of the following statements about characteristics of a hysteresis motor is NOT correct?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is option 3): (In a hysteresis motor the number of rotor poles is greater than the number of stator poles.)
Concept:
- Hysteresis motors have uniform torque from standstill to synchronous speed. the hysteresis motor, the torque is constant at all the speed even at the synchronous speed.
- A hysteresis motor is a single-phase synchronous motor whose operating principle is based on the effect of magnetic hysteresis. According to magnetic hysteresis, the magnetic flux density in a ferromagnetic material lags behind the magnetising force
- A hysteresis motor can synchronise any load which it can accelerate, no matter how great the inertia of the load is.
- In a hysteresis motor, the number of rotor poles is equal to the number of stator poles.
- By changing the number of stator poles through pole-changing connections, a set of synchronous speeds for the motor can be obtained.
- Hence option 3 is wrong
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