How do synchronous motors differ from squirrel-cage and wound rotor induction motors?
What will be an ideal response?
Characteristics that make synchronous motors different from squirrel-cage or wound rotor induction motors include:
• They can operate at synchronous speed.
• They operate at a constant speed from no load to full load. Synchronous motors will either operate at synchronous speed or they will stall and stop running.
• They can produce a leading power factor.
• They are sometimes operated without load to help correct plant power factor. In this mode of operation, they are called synchronous condensers.
• The rotor must be excited with an external source of direct current.
• They contain a special squirrel cage winding called the amortisseur winding that is used to start the motor.
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