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Synchronous machines:




  1. Wound-rotor or permanent magnet to generate the rotor magnetic field.
  2. Rotor magnetic field is stationary with respect to the rotor. 
  3. Always turn at synchronous speed.
  4. Require some form of control to operate. 
  5. More expensive to produce than squirrel cage induction machines.
  6. Not self-starting.
  7. More efficient than induction machines.
Induction Machines:


  1. Wound-rotor or squirrel cage to generate the rotor magnetic field.
  2. Rotor magnetic field rotates with respect to the rotor. 
  3. Always turn at less than synchronous speed.
  4. Do not require control. 
  5. Much cheaper to produce (true for squirrel cage machines).
  6. Self-starting.
  7. Less efficient than synchronous machines.
  8. More suitable for explosive environments.
  9. No maintenance (for squirrel cage machines).

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