what is the difference between synchronous and asynchronous motor?

what is the difference between synchronous and asynchronous motor?
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2 Answers

Answer :

rotor which rotates in synchronous (in same time) with stator magnetic field is called synchronous motor.

rotor which not rotate in synchronous (in same time) with stator magnetic field is called asynchronous motor like Induction motor.
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Answer :

Asynchronous motors and syncrouns motor are called as dc machines.  and also syncrouns motor called as induction motor. Asynonymous motor as are rotates with constant speed we not able to operate .syncrouns motors are rotates with it speeding levels. It is able to operate. These are a small difference between syncrouns and asynchronous motors. 
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Last Answer : In a synchronous motor, the armature current has large values for high and low excitation.

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Last Answer : The duration of sudden short-circuit test on a synchronous motor is usually about one second.

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If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then?

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The armature current of the synchronous motor?

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An over excited synchronous motor on noload is known as?

Last Answer : An over excited synchronous motor on noload is known as synchronous condenser.

Which motor have more efficiency, synchronous motor or induction motor?

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If we change the excitation of synchronous machine will it affect on motor speed?

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How can we reverse the direction of rotation of synchronous motor?

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What is the maximum value of torque angle in synchronous motor?

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If the load of the normally excited synchronous motor is increased the power factor will?

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Last Answer : If the load of the normally excited synchronous motor is increased the power factor will become lagging.

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Last Answer : Hunting in synchronous motor cannot be due to windage friction.

The synchronous motor which works on leading power factor and does not drive any mechanical load is called?

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Last Answer : The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.

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Last Answer : The damping winding in synchronous motor is generally used to provide starting torque and prevent hunting.

If the field of synchronous motor is under excited, power factor will be?

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Last Answer : If the field of synchronous motor is under excited, power factor will be lagging.

An unexcited single phase synchronous motor is ?

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Last Answer : An unexcited single-phase synchronous motor is reluctance motor.

A synchronous motor can be made self starting by providing?

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Last Answer : A synchronous motor can be made self-starting by providing damper bar.

In a synchronous motor which losses varies with load?

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Last Answer : In a synchronous motor, copper losses varies with load.

The back emf of synchronous motor depends on?

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Synchronous motor always runs at which speed?

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Last Answer : Synchronous motor always runs at synchronous speed.