The Polyphase Induction Motor

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ECEN 45171Experiment No. 4The Polyphase Induction MotorThe Polyphase Induction Motor is the most commonly used industrial Motor , findingapplication in many situations where speed regulation is not essential. It is simple andrelatively inexpensive, and the absence of sliding contacts in the squirrel-cage machinereduces maintenance to a minimum. There are two general types of Polyphase inductionmotors: the squirrel-cage type and the wound-rotor machine. Both motors have anarmature or stator structure similar to that of the alternating current generator, consistingof a hollow cylinder of laminated sheet steel in which are punched longitudinal slots. Asymmetrical Polyphase winding is laid in these slots which, when connected to a suitablevoltage source, produces a travelling MMF wave in the air gap, rotating at a synchronousspeed equal to: RPMsync= 120fp(1)where f is the frequency and p the number of poles for which the stator is squirrel-cage type of rotor is made up of sheet steel laminations keyed to theshaft and having slots punched in the periphery.

The Polyphase Induction Motor The polyphase induction motor is the most commonly used industrial motor, finding application in many situations where speed regulation is not essential. It is simple and relatively inexpensive, and the absence of sliding contacts in the squirrel-cage machine reduces maintenance to a minimum.

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