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The polyphase induction engine invented by Nikola Tesla in 1886 have been developed by 1895 virtually into its present squirrel-cage form. The slip-ring induction motor originated a short time later. Because of its simplicity and cheapness, the 3-phase squirrel-cage induction motor is now by far the most common type of motor in use for driving industrial plant, particularly of little power rankings (up to 20 kW). The slip-ring induction motor is not as just constructed as the cage induction engine, but it is possible to regulate its starting efficiency and acceleration by connecting external gear (commonly resistors) into the rotor circuit via slip-rings. 3-stage induction motors could be made to any 3 Phase Induction Motor preferred power ratings, but natural running speeds are related to the power-supply frequency.