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Download electrical engineering technology emt 113/4
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Transcript
THE ELECTRICAL FREQUENCY ON THE ROTOR. ï± The induction motor works by inducing voltages and current in the rotor of the machine-called a rotating transformer. ï± Like a transformer; primary (stator) induced a voltage in the secondary (rotor) ï± Unlike a transformer, the secondary frequency not necessarily the same as primary. ï± If the rotor of a motor is locked so that it cannot move, the rotor will have the same frequency as the stator. ï± If the rotor turns at synchronous speed, the frequency on the rotor will be zero. ï± For nm=0 r/min & the rotor frequency fr=fe ï slip, s = 1 nm=nsync & the rotor frequency fr=0 ï slip, s = 0 - For any speed in between, the rotor frequency is directly proportional to the difference between the speed of the magnetic field nsync and the speed of the rotor nm. n ïn sï½ sync nsync m
