The polyphase induction engine invented by Nikola Tesla in 1886 had been developed by 1895 practically into its present squirrel-cage form. The slip-ring induction motor was developed a short while later. Due to the simplicity and cheapness, the 3-phase squirrel-cage induction motor is now by significantly the most typical type of motor used for driving commercial plant, particularly of little power ratings (up to 20 kW). The slip-ring induction motor is not as just built as the cage induction engine, but it is possible to regulate its starting efficiency and acceleration by connecting external products (3 Phase Induction Motor commonly resistors) in to the rotor circuit via slip-rings. 3-stage induction motors can be made to 
any preferred power ratings, but organic running speeds are related to the power-supply frequency.
3 Phase Induction Motor
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