Electrical Machines
Scott connections are used for

 three phase to single phase transformation.
 three phase to two phase transformation.
 single phase to three phase transformation.
 any of the above.

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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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