You asked: What is induction motor and how it works?

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 the working principle of induction motor?

The motor which works on the principle of electromagnetic induction is known as the induction motor. The electromagnetic induction is the phenomenon in which the electromotive force induces across the electrical conductor when it is placed in a rotating magnetic field.

What happens if the slip of induction motor is one?

Slip = 1, means that rotor is stationary. Negative value of slip in induction motor can be achieved when the rotor speed is more than the synchronously rotating magnetic flux.

Where are induction motors used?

Used in almost every process, induction motors are mainly used in water pumps, kitchen appliances, fans and air conditioners, automobiles and common industrial machinery like boiler pumps and compressors.

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What is advantage and disadvantage of induction motor?

A single phase induction motor, unlike a 3 phase induction motor, does not have a self starting torque. Auxiliaries are required to start a single phase motor. During light load conditions, the power factor of the motor drops to a very low value.

What is the purpose 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 the unit of slip in induction motor?

Definition: In Induction Motor, a slip is a speed among the rotary magnetic flux as well as rotor expressed in terms of for every unit synchronous speed. It can be measured in dimensionless & the value of this motor cannot be zero.

What is the motor slip?

Slip is the differentiation between synchronous and asynchronous speed. … The difference between the synchronous speed of the electric motor magnetic field, and the shaft rotating speed is slip – measured in RPM or frequency. Slip increases with increasing load – providing a greater torque.

What is normal slip of an induction motor?

Because of this speed difference, the motor rotates at a speed slightly slower than the synchronous speed. Slip is normally expressed in percentage. Slip of a power induction motor is 2 to 3% when the motor is operated under the rated load.

What is difference between induction motor and synchronous motor?

A three phase Synchronous motor is a doubly excited machine, whereas an induction motor is a single excited machine. The armature winding of the Synchronous motor is energized from an AC source and its field winding from a DC source. The stator winding of Induction Motor is energized from an AC source.

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Which type of winding is induction motor?

The most used winding type for medium-size induction motors is a double layer winding with pitched winding step, for example pitched for two stator slots (Fig. 2). Significant advantage of the aforementioned winding is a smaller mass of inserted copper because of shortest winding-ends.

Which motor is used in fan?

induction motor

What is the main disadvantage of synchronous motors?

The disadvantages of Synchronous motor includes: Synchronous motors require dc excitation which is supplied from external sources. These motors are not self-starting motors and need some external arrangement for its starting and synchronizing. The cost per kW output is commonly higher than that of induction motors.

What are the disadvantages of electric motors?

Temperature constraints can be a disadvantage for electric motors, due to the batteries themselves. High temperatures can shorten battery life, and very low temperatures can (temporarily) reduce the useful capacity of the battery.

Why is an induction motor better?

The motor shaft rotates. Induction Motors induce the magnetic field within the rotor by implanting a short current in the squirrel cage. This concept effects higher losses in the rotor and causes higher heat and less efficiency. … Higher efficiency motors use copper because of its better electromagnetic behaviour.

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