You asked: Why we use only synchronous motor as a generator?

Assuming it is connected to the power system, the synchronous generator can draw excitation from the DC field or through the armature winding. So, like the synchronous motor, it can operate at leading or lagging power factors, which enables it to provide reactive power to inductive loads in the power system.

Can a synchronous motor be used as a generator?

Originally Answered: Can a synchronous motor work as a synchronous generator? Yes. Simply the three phase supply is removed and only the DC field supply is retained. When the motor is run from external prime mover, they become an alternator or synchronous generator.

Why is it called synchronous generator?

A synchronous generator is called “synchronous” because the waveform of the generated voltage is synchronized with the rotation of the generator. Each peak of the sinusoidal waveform corresponds to a physical position of the rotor. … The peaks of the waveform have no fixed relationship with the rotor position.

What are the advantages of synchronous motor?

The advantages of the synchronous motor are the ease with which the power factor can be controlled and the constant rotational speed of the machine, irrespective of the applied load. Synchronous motors, however, are generally more expensive and a d.c. supply is a necessary feature of the rotor excitation.

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Which is the main application of synchronous motor?

Synchronous motors are normally used in applications in which a constant and precise speed is required. Typical applications of these low power motors are positioning machines. They are also used in robot actuators. Synchronous motors are also used in ball mills, watches, record players, and turntables.

What is the function of synchronous generator?

Definition: The synchronous generator or alternator is an electrical machine that converts the mechanical power from a prime mover into an AC electrical power at a particular voltage and frequency. The synchronous motor always runs at a constant speed called synchronous speed.

What is the main disadvantage of synchronous motors?

Disadvantages or Demerits:

Synchronous motors requires dc excitation which must be supplied from external sources. Synchronous motors are inherently not self starting motors and needs some arrangement for its starting and synchronizing. The cost per kW output is generally higher than that of induction motors.

What are the benefits of synchronous motor in real world application?

Because of the higher efficiency possible with synchronous motors, they can be used for loads where constant speed is required. Typical applications of a high-speed synchronous motor (above 500 rpm) are fans, blowers, pumps and compressors. 4. Since synchronous motors can be built for speeds as low as 120 RPM.

Is a synchronous motor AC or DC?

In a synchronous motor, AC power is supplied to the stator to generate a rotating magnetic field. DC power is supplied to the rotor which results in discrete North (N) and South (S) poles.

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