Question

Why linear inductin motor is used in metro instead of rotary induction motor?

Answer 1

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ȯ Because of its cut-open magnetic circuit, the linear induction motor (LIM) possesses the inherent characteristics such as longitudinal end-effect, transversal edge-effect and normal force. ... It uses a rotary electrical motor as source of motion in order to convert the rotary mot ion into a linear motion

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Answer 2

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1. Linear induction motors are thus frequently less energy efficient than normal rotary motors for any given required force output.
2. They are therefore often used where contactless force is required, where low maintenance is desirable, or where the duty cycle is low.

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