3 Phase Induction Motor

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 3 Phase Induction Motor simplicity and cheapness, the 3-phase squirrel-cage induction electric motor is now by far the most common type of motor used for driving industrial plant, particularly of small power ratings (up to 20 kW). The slip-ring induction engine is not as basically built as the cage induction engine, nonetheless it is possible to regulate its starting efficiency and quickness by connecting external gear (commonly resistors) into the rotor circuit via slip-rings. 3-stage induction motors could be made to any preferred power ratings, but natural running speeds are related to the power-supply frequency.


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