Linear Induction Motor

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Linear induction motors are electric induction motors that produce motion in a straight line rather than rotational motion. In a traditional electric motor, the rotor (rotating part) spins inside the stator (static part); in a linear induction motor, the stator is unwrapped and laid out flat and the "rotor" moves past it in a straight line. Linear induction motors often use superconducting magnets, which are cooled to low temperatures to reduce power consumption. In a traditional DC electric motor, a central core of tightly wrapped magnetic material (known as the rotor) spins at high speed between the fixed poles of a magnet (known as the stator) when an electric current is applied. In an AC induction motor, electromagnets is place around

Any occurrence of a relative speed between the electromagnetic field and short circuited motor, will lead to the inducement of current which in result produced electromagnetic force. According to Lenz’s law the conductor (the train body) tries to move in such direction that eliminates the induced current. When an AC current is supplied, a rotating magnetic field is also produced. Current induced in the reaction plate by the rotating magnetic field create a secondary magnetic field. The interaction of these two magnetic field lead to the production of linear thrust which in turn be manipulated for the propulsion of the train whether in steady-state, accelerating, braking or stopping. Increment of the speed of the train should require more power hence various alteration can be perform either by manipulating the magnetic field or increasing the amount of voltage supplied which is usually limited by bus

Most obviously, there are no moving parts to go wrong. As the platform rides above the track on a cushion of air, there is no loss of energy to friction or vibration (but because the air-gap is greater in a linear induction motor, more power is required and the efficiency is lower). The lack of an intermediate gearbox to convert rotational motion into straight-line motion saves energy. Both acceleration and braking are achieved through electromagnetism (increment of voltage or manipulation of electromagnetic field), linear induction motors are much quieter than ordinary motors. Linear induction motor are also very responsive since it is not consist of mechanical part. It’s high production cost and heating issues is are probably what holding it back from