Advantages, Disadvantages and Application Of Synchronous Motor

There are advantages, disadvantages and Application Of Synchronous Motor is provided in this article which is very useful to increase knowledge in the field of electrical machine learning.

There are many advantages, disadvantages and application of synchronous motor are mentioned below:

Advantages Of Synchronous Motor

All the advantages of synchronous motor is provided below:

✓These motors can be used for power factor correction in addition to supply torque to drive
loads.

✓They are more efficient(when operated at unity power factor)than induction motors of
corresponding output in kW and voltage ratings.

✓The field pole rotors of synchronous motors can permit the use of wider air-gaps than the
squirrel-cage designs used on induction motors, requiring less bearing tolerance and permitting greater bearing wear.

✓They may be less costly for the same output, speed, and voltage ratings as compared to induction motors.

✓They give constant speed from no-load to full-load.

✓Electro-magnetic power varies linearly with the voltage.

Disadvantages Of Synchronous Motor

The disadvantages of synchronous motors are provided below:

✓They require D.C. excitation which must be supplied from external source.

✓They have a tendency to hunt.

✓They cannot be used for variable speed jobs as speed adjustment cannot be done.

✓They require collector rings and brushes.

✓They cannot be started under load. Their starting torque is zero.

✓They may fall out of synchronism and stop when overloaded.

Application Of Synchronous Motor

The synchronous motors have the following practical of application which is mentioned below:

✓Power houses and sub-stations. Used in power houses and sub-stations in parallel to
the bus-bars to improve the power factor.

✓Factories. Used in factories having large number of induction motors or other power
apparatus, operating at lagging power factor, to improve the power factor.

✓Mills-industries etc. Used in textile mills, rubber mills, mining and other big industries, cement factories for power applications.

✓Content speed equipment's. Used to drive continuously operating and constant speed
equipment such as: