How do Linear Induction Motor's work?

Answer 1

First of all, do you understand how a normal motor works? Because a linear motor functions much like a normal motor that has been torn apart and laid out in a line.

A motor has a moving portion and a stationary portion. Fields are applied to each part such that the movable portion is urged to move in a certain direction by the polarity of the magnetic field.

If nothing else happened, the movable part would move to where its poles were aligned with the poles of the stationary part and it would stop there. But we trick it. Just as the moving part reaches its goal, we change the poles. Now what was attracting repels and the next pole attracts, so the moving part continues its motion.

In a rotating machine, the stationary poles are arranged around the circumference of the motor and the rotating part chases the field around and around. In a linear motor, the stationary part is strung out in a long line with many coils. Each coil is energized at just the right time to keep the moving part moving in the proper direction.