Advantages
Synchronous motors have the following advantages over non-synchronous motors:
- Speed is independent of the load, provided an adequate field current is applied.
- Accurate control in speed and position using open loop controls, e.g. stepper motors.
- They will hold their position when a DC current is applied to both the stator and the rotor windings.
- Their power factor can be adjusted to unity by using a proper field current relative to the load. Also, a "capacitive" power factor, (current phase leads voltage phase), can be obtained by increasing this current slightly, which can help achieve a better power factor correction for the whole installation.
- Their construction allows for increased electrical efficiency when a low speed is required (as in ball mills and similar apparatus).
- They run either at the synchronous speed or they do not run at all.
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