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Why are Synchronous Motors More Efficient?

A synchronous electric motor is an AC motor in which the shaft rotation is synchronised with the rated frequency supply in steady-state, and a rotation period is an integral number of AC cycles. In this article, we discuss the reasons why these motors are more efficient than others.

What is a Synchronous Motor?

A synchronous motor is an AC motor whose shaft rotation is synchronised with the frequency of the supplied current in steady-state; a rotation period is an integral number of AC cycles.

On the stator of a synchronous motor, multiphase AC electromagnets generate a magnetic field that spins in time with the line current oscillations. The rotor, which is made up of permanent magnets or electromagnets, rotates at the same rate as the stator field, resulting in a second synchronised revolving magnet field in any AC motor. If both the rotor and stator are supplied with independently excited multiphase AC electromagnets, the synchronous motor is referred to be doubly-fed.

Operating principle Of Synchronous Motor :

Asynchronous motor works by having the rotor follow the spinning magnetic field of the stator and revolve at a speed that is close to it. The rotor winding is excited by a DC source, whereas the stator winding is excited by an AC source.

The following are important aspects to remember about the Synchronous Motor’s operation:

  • The stator winding produces a three-phase rotating magnetic field due to three-phase AC.
  • A continuous magnetic field is created by the rotor winding.

The rotor winding is excited by a DC source, whereas the stator winding is excited by an AC source.

  • Because of its inertia, the rotor will not begin to revolve. As a result, the first rotation will be provided from an external source.
  • The external source is turned off after the rotor reaches synchronous speed.
  • The magnetic field of a rotor is created through induction, not by the rotor’s magnetic field.
  • As a result, the air gap between the rotor and the stator is not kept as tiny as it might be.

What are the advantages of using a synchronous motor?

The ability to regulate the power factor is one of the benefits of employing synchronous motors. An over-excited synchronous motor has a higher power factor than induction motors and may be used in parallel with them to improve the system power factor. In synchronous motors, the speed stays constant regardless of the loads.

Why is the synchronous motor’s speed constant?

The synchronous motor’s rotor is also DC excited, resulting in a steady flux that forms the electromagnetic poles on the rotor, which are initially immobile. Even when loaded, the speed remains constant, but the torque angle (between the magnetic poles of the stator and rotor) might change.

What is the meaning of the term “synchronous motor”?

It is for this reason that the motor is known as a synchronous motor. It’s a constant-speed motor because it maintains the very same synchronous speed regardless of the load. Synchronous Machines, as the name suggests, operate at synchronous speeds.

We utilise synchronous motors for a variety of reasons

Because it is critical to maintaining the frequency at which the generator is linked, synchronous generators are virtually always used in electrical power plants. Positioning devices, which demand great accuracy, and robot actuators are examples of low-power applications. Electric clocks use mains-powered synchronous motors.

In rare situations, synchronous motors may attain efficiencies of more than 90%, and they are typically more energy-efficient than induction motors. The efficiency varies depending on the motor type and size, but synchronous motors have less energy lost in the conversion from electrical to mechanical energy due to the lack of slip.

What is the definition of an AC synchronous motor?

The asynchronous electric motor is an AC motor whose shaft rotation is synchronised with the frequency of the supply current in a steady-state, and a rotation period is an integral number of AC cycles. Get the best quality synchronous motor from the leading manufacturers in China contact us today at +86-571-88220971 or visit  https://hzpt.com/electric-motors/

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