What is thrust in linear induction motor?

Thrust force is produced through the interaction between the eddy currents and magnetic field when eddy currents occur in the aluminum sheet due to variations in the magnetic field created by the coils. … This is because variations in magnetic flux to the rear of the motor increase as the translation speed is increased.

What is the mean of thrust in linear induction motor?

The thrust produced by a linear induction motor is a factor of the supplied voltage, the amount of slip, and the size of the air gap, as well as the influence of end effects. And because linear induction motors have lower efficiencies, cooling can have a measurable effect on the motor’s ability to produce thrust.

What is end effect in linear induction motor?

End effect

Unlike a circular induction motor, a linear induction motor shows ‘end effects’. These end effects include losses in performance and efficiency that are believed to be caused by magnetic energy being carried away and lost at the end of the primary by the relative movement of the primary and secondary.

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How does a linear induction motor work?

How Does a Linear Induction Motor Work? … The wave induces an electric current in the conductive reaction plate. The induced electric current interacts with the magnetic flux to produce a linear force. The speed of the motor can be varied by changing the input frequency using an adjustable frequency drive.

How can the speed of a linear induction motor be controlled?

For accurate control of speed or position, the speed of the shaft can be monitored by a tachometer or position sensor and compared with a signal representing the desired value. The difference is then used to control the inverter frequency.

What is the use of induction motor?

An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor can therefore be made without electrical connections to the rotor.

Which motor is used for traction purpose?

AC traction motors have replaced DC motors in many traction applications. The motors used are induction or asynchronous motors designed to have characteristics suitable for traction. The speed and torque of the motor are controlled by varying the frequency, voltage and current applied to the stator coils.

Which motor is used in maglev train?

Linear induction motors used in magnetic levitation (maglev) trains use a higher constant slip frequency operating scheme than rotary motors to meet thrust and normal force requirements. Thus, the constant slip frequency is used in all operation conditions, which reduces the efficiency of the propulsion system.

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Is used in linear induction motor to find the direction of force?

If a three phase supply is connected to the stator of an induction motor, a rotating flux is produced. This flux rotates at a synchronous speed in the air gap. … If secondary of the linear induction motor is fixed and the primary is free to move, the force will move the primary in the direction of the travelling wave.

How efficient are linear motors?

Efficiency of linear motors is about 85%, and up to about 90% for ball-screw drives. Linear motors, ball screws, and precision rack-and-pinion gear drives are all good options for engineers designing electromechanical linear-motion systems.

What is the advantage of linear induction motor?

The advantages of linear induction motors are: Low initial cost. Low maintenance cost due to the absence of rotating parts. No limitation of maximum speed due to centrifugal forces.

Where are linear motors used?

Linear motors are widely used. One of the major uses of linear motors is for propelling the shuttle in looms. Linear motors have been used for sliding doors and various similar actuators. Also, they have been used for baggage handing and even large-scale bulk materials transport.

How do linear motors work?

Linear motors operate with an AC power supply and servo controller, which are often the same as those used for rotary servo motors. The linear motor primary part is connected to the power supply to produce a magnet field. By changing the current phase in the coils, the polarity of each coil is changed.

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Which motor has relatively high power factor?

98. Which single phase motor has relatively high power factor ? (D) Synchronous motor.

What is double sided linear induction motor?

A Double-sided Linear Induction motor (DSLIM) is a special type of induction motor which gives linear motion instead of rotational motion, as in the case of conventional induction motor. It operates on the principle of which a conventional induction motor operates.

Motorization