Comparison between Synchronous Motor and 3-Phase Induction Motor
Comparison Between Synchronous Motor and 3-Phase Induction Motor
In this short post let us see difference between the 3-Phase Induction Motor and the synchronous motor.
Before proceeding further let us refresh the basics of both the motors.
Motors operation in the AC (alternating current) are classified as follows:
(1) Single Phase Induction Motor
(2) Three Phase Induction Motor
(3) Synchronous Motor
Three Phase Induction Motors:
The three-phase induction motor is further classified into two types namely squirrel cage motor and slip ring induction motor.
Of all the ac motors, the 3-phase induction motor is widely used for various kind of applications.
They have the following advantages and disadvantages.
- The construction is simple, rough, unbreakable.
- It is low-cost, reliable.
- It is self-starting, no starters required.
- Its speed decreases with increase in load.
- Its speed can not be varied without losing some efficiency.
- A synchronous motor is identical in construction with an alternator or AC generator.
- Similar to DC machines, a synchronous machine may be used as an alternator when driven mechanically or as a motor when driven electrically.
The following table gives us the Comparison between synchronous motor and 3-Phase Induction Motor
|3-Phase Induction Motor||Synchronous Motor|
|It is self starting.||It is not self starting.|
|The actual speed of the induction motor falls slightly with increase in load.||Synchronous motors run at constant speed at any load for a given frequency.|
|Induction motors can be run with lagging power factor only. The power factor is low at light loads.||Motor can be worked under various power factors, such as lagging, leading and unity.|
|No exciter is required.||The motor requires a separate DC exciter for its field supply.|
|Changes in voltage applied in induction motors affect the torque. The torque is proportional to the square of the applied voltage.||Changes in voltages applied in synchronous motor do not affect the motor torque. The break down torque of the motor is approximately, proportional to the applied voltage.|
|The cost of induction motor is low.||The cost of synchronous motor is high.|
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