Often asked: How Synchronous Motor Is Different From Induction Motor?

What is the difference between the synchronous and asynchronous induction motors?

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. AC Induction Motor is known as the Asynchronous Motor. Synchronous motor does not have slip.

What is the difference between synchronous and induction generator?

Difference between synchronous generator and induction generator. In a synchronous generator, the waveform of generated voltage is synchronized with (directly corresponds to) the rotor speed. Induction generator takes reactive power from the power system for field excitation.

Why a synchronous motor is less economical than an induction motor?

The efficiency depends on the specific motor type and size, but the lack of slip in synchronous motors means there is less energy lost in converting between electrical energy and mechanical energy.

How do you identify a synchronous motor?

The speed of the rotating stator field is called the synchronous speed. The frequency of the power supply and the number of poles of the machine determine the synchronous speed. A synchronous motor is one in which the rotor turns at the same speed as the rotating magnetic field in the stator.

Why do we use synchronous motors?

In higher power industrial sizes, the synchronous motor provides two important functions. First, it is a highly efficient means of converting AC energy to work. Second, it can operate at leading or unity power factor and thereby provide power-factor correction.

Why it is called induction motor?

The asynchronous motor is based on the currents induced in the rotor from the rotating magnetic field of the stator. That’s why it’s called an induction machine. For this reason the motor rotates at a different speed than the stator field and therefore rotates asynchronously.

How does an induction motor start?

When the supply is connected to the stator of a three-phase induction motor, a rotating magnetic field is produced, and the rotor starts rotating and the induction motor starts. At the time of starting, the motor slip is unity, and the starting current is very large.

Can induction motor be used as generator?

Induction generators operate by mechanically turning their rotors faster than synchronous speed. A regular AC induction motor usually can be used as a generator, without any internal modifications. An induction generator usually draws its excitation power from an electrical grid.

Why capacitor is used in induction generator?

The capacitors serve as the excitation source for the induction generator. The selection of an excitation capacitor is very important for voltage regulation of a single-phase induction generator. The capacitance must be chosen so that the desired terminal voltage level at the given speed and range of loads is obtained.

Can induction motor run at synchronous speed?

The induction motor can not run at synchronous speed because synchronous speed is a hypothetical speed not a rela speed. Explanation: Synchronous speed can not be achieved in real world because to achieve that speed a vacuum is required with friction which is total impossible in real world.

What are the types of induction motor?

There are basically two types of induction motor. The types of induction motor depend upon the input supply. There are single phase induction motors and three phase induction motors. Single phase induction motors arenot a self -starting motor, and three phase induction motor are a self -starting motor.

What is the function 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 does synchronous mean?

1: happening, existing, or arising at precisely the same time. 2: recurring or operating at exactly the same periods. 3: involving or indicating synchronism.

What is synchronous speed?

Synchronous speed is a significant parameter for the rotating magnetic field-type AC motor. It is determined by the frequency and the number of magnetic poles. Synchronous speed No = [rps, revolutions per second] f = Frequency [Hz] p = Number of magnetic poles.