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Linear Induction Motor

Linear Induction Motor. Real World Applications:. Linear Induction Motor Theory: Induction : The process of creating a current in a conductor by imposing a changing magnetic field through the conductor.

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Linear Induction Motor

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  1. Linear Induction Motor Real World Applications: Linear Induction Motor Theory: Induction: The process of creating a current in a conductor by imposing a changing magnetic field through the conductor Magnetically-levitated (Maglev) trains use induction to both levitate the train off of the rail and propel it forward. This reduces friction and allows the trains to reach very high speeds. How does it work? • The military is developing linear induction rail gun devices that can fire a projectile at speeds approaching 2 miles per second! High-speed maglev train in Japan (image from Wikipedia.org) (1) A 3-phase voltage is applied to the stator copper windings, creating a traveling magnetic field in the aluminum rotor bar (2) The changing magnetic field induces eddy currents in the aluminum rotor bar. (3) Because they are in a magnetic field, the currents in the rotor bar experience a force, propelling the rotor bar forward. Traveling magnetic field • Many roller coasters use linear induction motors for smooth and fast propulsion Linear force Rotor bar eddy currents are induced by the changing magnetic field. Power and Energy Systems Area, Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign Supported by the Institute for Electrical and Electronics Engineers, Central Illinois Section Rotor (aluminum) flux field wavelength Copper windings Linear speed 3-phase ac voltage source A B C Stator (magnetic steel) speed = frequency • wavelengthExample: wavelength = 5 in frequency = 60 Hz speed = 17 mph Gliding platform ac voltagefrequency

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