Reluctance Motor and Hysteresis Motor: Single phase Synchronous Motors are mainly Reluctance Motor and Hysteresis Motor.
Single phase Synchronous Motor
Reluctance Motor
In single-phase reluctance motor, the rotating field is produced by main and auxiliary winding (split phase) placed in stator slots. The rotor is made of stampings with a projecting structure as shown in Fig. below. Short-circuited bars are placed in the projected stator portions.
The motor starts like a single-phase induction motor. Near synchronous speed, the rotor gets locked with the rotating magnetic field in the position of minimum reluctance and thereafter runs at synchronous speed.
Read Also: Single Phase Induction Motor MCQ
Hysteresis Motor
A split-phase stator and a solid iron rotor with high hysteresis loss is employed in a hysteresis motor. The motor starts by induction action and is pulled into synchronism near synchronous speed. Because of hysteresis, the rotor field lags the stator field by an angle d with consequent torque production as shown in Fig below.
Because of smooth rotor, it has a very low noise figure and is used in phonographic appliances.
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