Parts
A typical synchronous motor has the following parts:
- A stator winding, connected to the AC supply, which creates a rotating magnetic field.
- A rotor which turns within the stator field. In excited machines this carries a field winding supplied by DC current from the slip rings. This winding is an electromagnet. In non-excited machines, the rotor is a solid cylindrical steel casting, while in permanent magnet motors there are permanent magnets in the rotor.
- In DC excited machines, slip rings on the rotor supply the DC to the field winding from an external supply (some motors have other arrangements).
- The stator frame contains and supports the other parts and may include bearing housings.
Large machines include additional parts for cooling the machine, supporting the rotor, lubricating and cooling the bearings, and various protection and measurement devices.
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