Difference Between Synchronous Motor And Induction Motor Pdf

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Synchronous motor is a machine whose rotor speed and the speed of the stator magnetic field is equal. Asynchronous motor is a machine whose rotor rotates at the speed less than the synchronous speed. A synchronous motor is a doubly excited machine, whereas an induction motor is a single excited machine.

Before proceeding further let us refresh the basics of both the motors. The three-phase induction motor is further classified into two types namely squirrel cage motor and slip ring induction motor. Of all the ac motors, the 3-phase induction motor is widely used for various kind of applications. They have the following advantages and disadvantages.

Synchronous motor

A synchronous motor is a doubly excited machine, whereas an induction motor is a single excited machine. In case of Synchronous motor its armature winding is energized from an AC source and its field winding from a DC source, whereas in case of Induction motor its stator winding is energized from an AC source. The power factor of a synchronous motor can be adjusted to lagging, unity or leading by varying the excitation, whereas, an induction motor always runs at lagging power factor.

Synchronous motors are generally more efficient than induction motors. Synchronous motors are costlier. Synchronous motor is a machine whose rotor speed and the speed of the stator magnetic field is equal. Asynchronous motor is a machine whose rotor rotates at the speed less than the synchronous speed. Synchronous motor does not have slip.

The stator winding of Induction Motor is energized from an AC source. Synchronous Motor always runs at synchronous speed, and the speed of the motor is independent of load, but an induction motor always runs less than the synchronous speed. If the load increased the speed of the induction motor decreases.

A synchronous electric motor is an AC motor in which, at steady state, the rotation of the shaft is synchronized with the frequency of the supply current; the rotation period is exactly equal to an integral number of AC cycles. The synchronous motor and induction motor are the most widely used types of AC motor. It is due to the reason the motor is called as synchronous motor.

It is a constant speed motor because, despite the increase in load motor runs at the same synchronous speed. As the name implies, Synchronous Machine runs at synchronous speed Synch. One of the major advantage of using synchronous motor is the ability to control the power factor. An over excited synchronous motor can have leading power factor and can be operated in parallel to induction motors and other lagging power factor loads thereby improving the system power factor.

An electric motor is an electrical machine that converts electrical energy into mechanical energy. Armature motors, certain induction motors, and synchronous motors. Electricity only knows one speed. Definition of induction motor. There are two major types of synchronous motors: non-excited and direct current excited. Non-excited motors are manufactured in reluctance and hysteresis or permanent magnet designs. These motors employ a self-starting circuit and require no external excitation supply.

As per the rotor construction, there are two types of AC induction motor, namely slip ring and squirrel cage type. You can find these motors in water pumps, small table fans, mixer grinders, fruit juicers and many more appliances, those are operated by Volt AC supply. Low power applications of these motors include positioning machines.

These are also applied in robot actuators. Ball mills, clocks, record player turntables also make use of synchronous motors. Modern synchronous machines are usually are of self starting type and are arranged to stat as induction motors. The synchronous motor is made self starting winding by providing damper windings or squirrel cage winding in the rotor poles.

This rotating magnetic field cuts the damper windings in the rotor. 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. Skip to content. Search for:.

Difference between Induction Motor and Synchronous Motor

All rotary electric motors, ac, and dc, operate because of the interaction of two magnetic fields. Rotation is caused by the interaction between the two fields. In a simple dc motor, there is a rotating magnetic field whose polarity is reversed every half turn by means of a brush-commutator combination. Brushes — basically conductive carbon rods which brush against the conductors on the rotor as they turn — also serve the purpose of getting the electrical current into the spinning armature. The situation is a bit different in the dc brushless motor.

Difference between Synchronous Motor and Induction Motor

Difference Between Induction and Synchronous Motor is explained with the help of various factors, like the type of excitation used for the machine. The Speed of the motor, starting and operation, the efficiency of both the motors, its cost, usage, and applications. An Induction Motor is also known as Asynchronous Motor. It is so called because it never runs at synchronous speed. The induction motor is most widely used motor in all domestic and commercial motor.

A synchronous motor is a doubly excited machine, whereas an induction motor is a single excited machine. In case of Synchronous motor its armature winding is energized from an AC source and its field winding from a DC source, whereas in case of Induction motor its stator winding is energized from an AC source. The power factor of a synchronous motor can be adjusted to lagging, unity or leading by varying the excitation, whereas, an induction motor always runs at lagging power factor.

AC motors are divided into two types, synchronous motors and asynchronous motors which are also called induction motors. The biggest difference between synchronous motors and asynchronous motors induction motors is whether the speed of rotor is consistent with the speed of the rotating magnetic field in the stator. Furthermore, there are big differences specific to the performance parameters and applications between the two. Difference in Construction The stator windings of synchronous and induction motors are alike, and the main difference lies in the structure of the rotor.

A synchronous electric motor is an AC motor in which, at steady state , [1] the rotation of the shaft is synchronized with the frequency of the supply current ; the rotation period is exactly equal to an integral number of AC cycles.

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Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Puranen Published Computer Science. Thesis for the degree of Doctor of Science Technology to be presented with due permission for the public examination and criticism in the Auditorium at High dynamic performance of an electric motor is a fundamental prerequisite in motion control applications, also known as servo drives. Expand Abstract.

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4 Response
  1. Comupostta1991

    Difference in working · Synchronous motor: Stator poles rotate at the synchronous speed (Ns) when fed with a three phase supply. The rotor is fed with a DC.

  2. Henry B.

    Sap solution manager training material pdf mathematical expectation problems with solution pdf

  3. Saturno C.

    The rotor winding in a synchronous motor may receive current in a variety of ways, but usually not by induction (except in some designs, only to.

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