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 do linear motors work?
Bottom: A linear motor is like a normal electric motor that has been unwrapped and laid in a straight line. Now the rotor moves past the stator as it turns. Linear motors are electric induction motors that produce motion in a straight line rather than rotational motion.
Where are linear induction motors used?
This has the advantage that no electric power need be supplied to the vehicle itself. Linear induction motors also are used to drive conveyors, sliding doors, textile shuttles, and machine tools. Their advantage is that no physical contact is required and thus wear and maintenance are minimized.
What do you understand by linear induction motor?
A linear induction motor (LIM) is an alternating current (AC), asynchronous linear motor that works by the same general principles as other induction motors but is typically designed to directly produce motion in a straight line. … Their practical uses include magnetic levitation, linear propulsion, and linear actuators.
Where is a linear motor 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.
Are linear motors AC or DC?
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.
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.
How do you make a linear motor?
Linear actuators have a transmission element (usually a belt or leadscrew) that turn a rotary motor’s output into a linear movement. The form factor shown above with magnets and backiron on the stator and coils and backiron on the rotor is fairly common.
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 are the advantages 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.
What is a 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.
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.
What is a universal electric motor?
The universal motor is a type of electric motor that can operate on either AC or DC power and uses an electromagnet as its stator to create its magnetic field. … Universal motors have high starting torque, can run at high speed, and are lightweight and compact.
Who invented linear induction motor?
And with most of the current development in this intriguing field taking place in Japan, Korea and China (home to the 270mph Shanghai Transrapid system) it’s often forgotten that the technology was originally developed by British electrical engineer Dr Eric Laithwaite, inventor of the linear induction motor and the so- …
What is linear induction motor PPT?
WORKING OF A LINEAR INDUCTION MOTOR Primary of an LIM is excited by a balanced three phase power supply A traveling flux is induced in the primary instead of rotating 3 φ flux Electric current is induced into the secondary due to the relative motion between the traveling flux and the conductors This induced …