What is synchronous motor
1. The synchronous motor is one type of 3 phase A.C motor which operate at a constant speed from no load to full load.
2. It is similar in construction to 3-phase A.C generator in that it has a revolving field which must be separately excited from a D.C source.
3. By changing the D.C field excitation,the power factor of this type of motor can be varied over a wide range of lagging and leading values.
4. This motor is used in many application because of its fixed speed from no load to full load, its high efficiency and low initial cost.
5. It is also used to improve the power factor of 3 phase AC industrial circuits.
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