Electrical Engineering ⇒ Topic : Advantage , disadvantages and application of linear induction motor
Simpler in construction
Better power to weight ratio.
Low initial cost.
No over-heating of rotor (since the motor moves continuously over cool rotor plate leaving behind heated rotor portion).
Owing to absence of rotating parts the maintenance cost is low.
No limitation of tractive effort due to adhesion between the wheel and the rail.
No limitation of maximum speed due to centrifugal forces.
Owing to transverse edge and end effects utilisation of motor is poor.
Capital cost of reaction rail fixed along the curve line of the track is very high.
Provision of three phase collector system along the track involves complications and high cost.
Maintaining adequate clearance at points and crossings entails a lot of difficulties.
Requirement of larger air-gap and non-magnetic reaction rail (rotor plate) necessitates
more magnetising current resulting in poor efficiency and low-power factor.
Following are the fields of application, of linear induction motor :
High-speed rail traction
Trolley cars (for internal transport in workshops)
As booster accelerator for moving heavy trains from rest or up the planes or on curves. Metallic belt conveyors etc.
Owing to design difficulties and economic considerations the use of linear induction motor is limited to only a few applications.
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