Use in Synchronous Motors
Synchronous motors may employ a squirrel cage winding embedded in their rotor to allow them to reach near-synchronous speed while starting. However the rotor is different in shape and material, because at synchronous speed it is designed to magnetize and become a permanent magnet. Once operating at synchronous speed, the magnetic field is rotating at the same speed as the rotor, so no current will be induced into the squirrel cage windings and they will have no further effect on the operation of the synchronous motor in steady state operation.
Read more about this topic: Squirrel-cage Rotor
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