The basic construction of a single-phase induction motor is similar to the three-phase induction motor.
1. Except that, its stator winding consists of a single-phase winding.
2. A centrifugal switch used in some types of motors, in order to cut out a winding, used only for starting purpose.
3. It has a distributed winding and a squirrel cage rotor.
4. When fed from supply its stator winding produce an alternating flux not revolving.
5. Hence, in these types of motor an auxiliary winding is used to the main winding for starring purpose.
Phase difference between two fluxes is 120o
For starting purpose, extra winding is not used.
Centrifugal switch is not use.
When fed from Three-phase supply its stator windings produce a flux of constant magnitude, which is rotating at synchronously.
It is self-starting.
Phase difference between two fluxes is 180o
Extra winding is essential for starting purpose.
A Centrifugal switch used in some types of motors.
When fed from Single-phase supply its stator winding produce a flux, which is alternating
The capacitor designed for short duty service and generated not more then 20 periods of operation per hour.
When the motor reaches 75% of full speed, the centrifugal switch S is cuts out both the starting winding and the capacitor from the suapacitor used for making necessary phase difference between [IS & IM].
Current [IM] drawn by the main winding lags the supply voltage V by a large angle.
Current [IS] drawn by the starting winding lead the supply voltage V by a certain angle.
The two currents are out of phase with each other by about 80o as compared to nearly 30o for a split-phase motor.
The resultant current [I] is small and almost in phase with V.
1. Except that, its stator winding consists of a single-phase winding.
2. A centrifugal switch used in some types of motors, in order to cut out a winding, used only for starting purpose.
3. It has a distributed winding and a squirrel cage rotor.
4. When fed from supply its stator winding produce an alternating flux not revolving.
5. Hence, in these types of motor an auxiliary winding is used to the main winding for starring purpose.
Phase difference between two fluxes is 120o
For starting purpose, extra winding is not used.
Centrifugal switch is not use.
When fed from Three-phase supply its stator windings produce a flux of constant magnitude, which is rotating at synchronously.
It is self-starting.
Phase difference between two fluxes is 180o
Extra winding is essential for starting purpose.
A Centrifugal switch used in some types of motors.
When fed from Single-phase supply its stator winding produce a flux, which is alternating
The capacitor designed for short duty service and generated not more then 20 periods of operation per hour.
When the motor reaches 75% of full speed, the centrifugal switch S is cuts out both the starting winding and the capacitor from the suapacitor used for making necessary phase difference between [IS & IM].
Current [IM] drawn by the main winding lags the supply voltage V by a large angle.
Current [IS] drawn by the starting winding lead the supply voltage V by a certain angle.
The two currents are out of phase with each other by about 80o as compared to nearly 30o for a split-phase motor.
The resultant current [I] is small and almost in phase with V.