AC Motors are mainly of two types, one is synchronous motor and other is asynchronous motor. Asynchronous motor is also known as induction motor. Both Motors are widely used electric motors. Although there is a big list of differences between these two motor but here we will learn some basic and major differences as given below:
Synchronous motor
– Synchronous motor run at a constant speed i.e. at synchronous speed
– Synchronous motor required DC excitation to its rotor.
– It is not self starting.
– Power factor can be changed from lagging to leading and vice versa.
– Speed of synchronous motor is constant at all load.
– Synchronous motor rotate because of magnetic locking between rotor poles and stator poles.
– Synchronous motor cost is high and required regular maintenance.
– Synchronous motor required DC excitation to its rotor.
– It is not self starting.
– Power factor can be changed from lagging to leading and vice versa.
– Speed of synchronous motor is constant at all load.
– Synchronous motor rotate because of magnetic locking between rotor poles and stator poles.
– Synchronous motor cost is high and required regular maintenance.
Induction motor
– Induction motor always run less than synchronous speed.
– Induction motor does not require any extra DC excitation source.
– It is self starting.
– Induction motor always operates at lagging power factor.
– When the load on induction motor increases its speed decreases.
– Three phase induction motor operates on induction principle.
– It is less costly and require less maintenance.
– Induction motor does not require any extra DC excitation source.
– It is self starting.
– Induction motor always operates at lagging power factor.
– When the load on induction motor increases its speed decreases.
– Three phase induction motor operates on induction principle.
– It is less costly and require less maintenance.
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