For industrial squirrel cage induction motors are used mostly for the motor and drive systems applications. Synchronous motors are very rarely used below 40kW output because of the higher cost compared to induction motors. In addition to the higher initial cost synchronous motors needs dc excitation source and starting and control devices are usually more expensive.
However for particular output range and speed high initial cost of synchronous motor varnishes are economical compared to induction motor. Where applications involve high kW output and low speed synchronous motors are economical compared to induction motors.
The various classes of service for which synchronous motors are employed may be classified as:
Applications:
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