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What do you understand by synchronous motor or synchronous generator?
The machine which converts mechanical power into AC electrical power is called a Synchronous Generator or Alternator. However, if the same machine can be operated as a motor is known as Synchronous Motor. Ns is the synchronous speed in revolution per minute (r.p.m) f is the supply frequency.
What is difference between synchronous motor and alternator?
Both the Alternators and generators are used to generate electricity. Alternators are also known as synchronous generator. Both perform same function but they are quite different in every aspect. The Alternator is used to produce three phase power from mechanical power.
Can we use synchronous motor 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.
Is synchronous machine AC or DC?
A synchronous electric motor is an AC electric 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.
What is the difference between synchronous and asynchronous generator?
A synchronous generator is called “synchronous” because the waveform of the generated voltage is synchronized with the rotation of the generator. An asynchronous generator is essentially the same machine as an asynchronous or induction motor. …
What is the difference between synchronous alternator and generator?
The main difference between them is in regard to what spins and what is fixed. 1. In an alternator, electricity is produced when a magnetic field spins inside the stator (windings of wire). In a generator, on the other hand, the armature or windings of wire spin inside a fixed magnetic field to generate electricity.
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 magnetic field of the rotor is supplied by direct current or permanent magnets.
What is synchronous motor?
A synchronous motor is one in which the rotor normally rotates at the same speed as the revolving field in the machine. The stator is similar to that of an induction machine consisting of a cylindrical iron frame with windings, usually three-phase, located in slots around the inner periphery.
Why we use only synchronous motor as a generator?
Essentially, either winding can provide exciting current for the machine, which means the power factor of the motor can be varied by controlling the field current. Thus, one of the traditional reasons for using a synchronous motor is to provide power factor correction.
Why are synchronous generators used?
Synchronous generators are commonly used for variable speed wind-turbine applications, due to their low rotational synchronous speeds that produce the voltage at grid frequency. Synchronous generators can be an appropriate selection for variable speed operation of wind turbines [166,167].