Basics Of Ac Synchronous Motor

Generally speaking, electrical motor is an electro-mechanical device which main purpose is to convert energy from electrical domain to mechanical domain. According to the type of input, there are two types of electro-mechanical motors: single phase and three (3) phase motors. Among the 3 phase electrical motors, induction and synchronous motors are the most commonly used.
The construction of an Ac synchronous motor is similar to the alternator - AC generator one. There are different types of synchronous motors available on the market and they are rated between 150kW to 15MW.



Construction Of An Ac Synchronous Motor

An Ac Synchronous Motor consists of stator and rotor. To minimize hysteresis losses and eddy current, the stator core of synchronous motors must be constructed with thin silicon structure, insulated by a surface coating. The stator has axial slots inside, where in is placed three phase stator winding.
The rotor in Ac synchronous motor is generally of salient pole type. Direct current supply is given to the rotor through slip-rings. The DC fires the rotor winding and creates electromagnetic poles.


The Work Of A Synchronous Motor

Ac synchronous motor has two electrical inputs. Actually, it is stator winding that consists of a 3 phase winding, which is provided with 3 phase supply and rotor, which is provided with DC supply. The 3 phase stator winding that carries 3 phase currents, produces 3 phase rotating magnetic flux andthe rotor carrying DC supply produces a constant flux.
For instance, if the frequency is taken to be 50 Hz, the 3 phase rotating flux will rotate about 3000 revolution in one minute or 50 revolutions in one second.
When talking about particular instant rotor and stator, its poles can be of same polarity (N-N or S-S) causing repulsive force on rotor and in the next second it'll be N-S causing attractive force. However, due to inertia of the rotor, the rotor cannot rotate in any direction because of the repulsive or attractive force and remain in standstill condition.
To overcome all the inertia situation, the rotor is provided with some mechanical input that rotates in the same direction as the magnetic field to a speed which is similar to the synchronous speed. After a while the Ac synchronous motor starts rotating in synchronization with the frequency.


Application Of Ac Synchronous Motor

  • Because synchronous motors are capable of operating under leading and lagging power factor, these types of motors can be used for power factor improvement. capacitors can not be used.
  • Synchronous motors are applied where high power at low speed is required. For instance, pumps, chippers, rolling mills, mixers, compressor and so on.

Comments

Post a Comment

Popular posts from this blog

Reasons Why Cotton Is the Best Fabric for Kids T-Shirts

Image
Kids are very moveable and love to play. And often time playtime means getting dirty. Sweat, sand, cuts and scrapes - they are all part of kids' games. Because of this, your little ones need pieces of clothing that will withstand heavy use and washing as well. Clothing that can take a beating and be ready for round two. Cotton is one of the best materials for kids' clothing because it's flexible, strong, and safe. But moreover, with cotton, you will spend less time washing their dirty clothes because cotton is very easy to care for.
Read more

How to Pull Off Wearing Western Boots

Image
Who says that you have to be a cowboy to wear and appreciate Western clothing? Every man can incorporate a touch of the Western style in his outfits with the right accessories, like by opting for a pair of western boots. Now honestly, they can be a bit tricky to pull off so if you have always wanted to wear such a pair, but still haven’t figured out how, let’s go through a few ideas.
Read more

A Basic Guide to Buying the Right Off-Grid Solar Inverter

Image
If you've spent any time researching off-grid solar systems, you've probably heard about the importance solar inverters play in it. It's basically the system's brain, managing its power flow and controlling the two types of power - DC and AC. DC, also known as direct current, is the power harvested by the panels and stored in the batteries. This type of power can't be used by your appliances, which is exactly why you need a solar inverter to change it into AC, or alternating current, that can then be used to power your TV, lights, fridge and other household appliances. While there are also on-grid inverters, off-grid inverters are much different in what they do.
Read more