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Linear induction motor can be used for
Electromagnetic pump
Conveyors
Trolley cars
All of above
All of above
A Linear Induction Motor (LIM) produces linear or translational motion directly instead of rotational motion. Consequently, all the given optionsтАФelectromagnetic pumps (for liquid metal propulsion), material transport conveyors, and high-speed traction like trolley cars or maglevsтАФare well-known applications of LIM.
A Linear Induction Motor (LIM) produces linear or translational motion directly instead of rotational motion. Consequently, all the given optionsтАФelectromagnetic pumps (for liquid metal propulsion), material transport conveyors, and high-speed traction like trolley cars or maglevsтАФare well-known applications of LIM.
vsтАЛ=2wf тАФ Linear synchronous speed where w is the pole pitch and f is frequency
s=vsтАЛvsтАЛтИТvтАЛ тАФ Linear slip where v is the actual linear speed
When the stator (primary) winding of a linear induction motor is energized by a 3-phase AC supply, it creates a linearly traveling magnetic field instead of a rotating field. This traveling magnetic field cuts the stationary conductor (secondary/rotor track) and induces currents that produce a linear thrust force (propulsion) according to Faraday's law and Lorentz force mechanism.
A Linear Induction Motor is essentially an unrolled or cut-flat conventional rotational induction motor.
It directly produces linear motion without mechanical gear conversion.
Used in liquid metal pumping (electromagnetic pumps) where liquid metal acts as the secondary conductor.
No mechanical energy conversion gears required, giving higher efficiency and lower friction loss
High acceleration capability and fast speed response
Higher end-effects causing non-uniform flux and reduced power factor
Large air gap leads to lower efficiency and higher magnetizing current
Electromagnetic pumps for conducting liquids (e.g., liquid sodium)
High-speed trains, trolley cars, and magnetic levitation (Maglev)
Material handling equipment like linear conveyors and automatic doors
Option A: Electromagnetic pumps utilize LIM to pump liquid metal through pipes without any moving mechanical impeller.
Option B: Linear conveyors utilize LIM for smooth, continuous linear propulsion of goods.
Option C: Trolley cars and modern transit systems use LIM for direct contact-free propulsion.
D is correct тАФ Linear induction motor produces direct translational force, making it suitable for electromagnetic pumps, linear conveyors, and trolley cars.
Always remember that in LIM, linear synchronous speed vsтАЛ=2wf depends on pole pitch w instead of the number of poles P used in rotational motors (NsтАЛ=120f/P).