Electrical Machines
A synchronous motor will deliver maximum power when

  input power factor is unity.
  load angle is 45°.
  load angle is 0°.
  load angle is equal to internal angle θ.

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

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

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