Electrical Machines
The synchronous motor can be started by

  coupling it with a small AC induction motor called the pony motor.
  coupling it with a DC compound motor.
  providing damper winding in its rotor circuit.
  any of the above methods.

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Electrical Machines
The 3 - Φ induction motors are, by a very considerable margin, the most widely used AC motors as

  they are capable of operation under range of leading and lagging pf.
  these are cheaper in cost, simple and rugged in construction.
  they have maximum efficiency and maximum starting torque.
  they have very good speed regulation.

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