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Linear induction motor
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==Principles== [[File:Linear motor field.gif|thumb|The magnetic field of a linear motor sweeping to the left, past an aluminium block. Coloured by induced electric current.]] In this electric motor design, the force is produced by a linearly moving [[magnetic field]] acting on conductors in the field. Any conductor, be it a loop, a coil, or simply a piece of plate metal, that is placed in this field will have [[eddy current]]s [[electromagnetic induction|induced]] in it thus creating an opposing magnetic field in accordance with [[Lenz's law]]. The two opposing fields will repel each other, creating motion as the magnetic field sweeps through the metal. :<math>n_s=2 f_s/p</math><ref name="sunilsaharan">{{cite web|url=https://www.sunilsaharan.in/article.php?id=25|title=Linear Induction Motor : Working, Application and Construction|website=sunilsaharan.in}}</ref> where {{math|''f''<sub>''s''</sub>}} is supply frequency in Hz, {{math|''p''}} is the number of poles, and {{math|''n''<sub>''s''</sub>}} is the synchronous speed of the magnetic field in revolutions per second. The travelling field pattern has a velocity of: :<math>v_s=2 t f_s</math><ref name=sunilsaharan/> where {{math|''v''<sub>''s''</sub>}} is velocity of the linear travelling field in m/s, and {{math|''t''}} is the pole pitch. For a slip of {{math|''s''}}, the speed of the secondary in a linear motor is given by :<math>v_r=(1-s)v_s</math><ref name=sunilsaharan/> {{clear}}
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