Basics of Phasors??

Have you ever draw the phasors of transformer, motor, or used the phasors to simplify your complex problems. Do you know the definition of the phasor. I know many from us always face problems while drawing the phasors diagrams. So in this article, we will get to know what is phasor, rules for drawing phasor, why to use them, operation on phasors.

single phasor

So basically phasor is a rotating vector that varies sinusoidally with time. The magnitude of the phasor represents the peak value of sinusoidal wave.you can see a rotating phasor sinusoidally with time. the one. I general we always consider the rotation of phasor anti-clockwise.

Rules of Phasor

we have no need to draw the phasors if we have only one quantity. if we have numbers of quantity then it makes sense to draw phasor. the quantities can be current1, current2, voltage1, voltage2, flux etc.the frequency of all these quantities should have to be the same to draw phasor.

Generally, we choose the x-axis as a reference. means starting from the x-axis makes it easy to draw.

I and V in the same phase

As we can see there is no phase difference in current and voltage phasors like happens in resistive loads.so we take a reference phase from either voltage and current as both are on the same phase we draw them on the same +x-axis.

V leading I

In this situation there is phase difference Φ we take I as a reference and as I said earlier that phasors rotate anti-clockwise so V is leading I with phase difference Φ.In the case V is lagging behind I by phase difference Φ then it is placed behind the reference phase(I) with phase difference Φ.

Why we use phasors??

As said earlier if we have more quantities than phasor makes our work easy. think you have 6 quantities of the transformer and you have to draw there waveforms it is difficult to draw these because it requires a large space of drawing them.instead of this we can use phasors system and now we can show even quantity in fewer space.phasors also make the analysis of RLC AC circuits easy. It is used in the Laplace transform and can be used to drive the transient response of RLC circuits.

Operation on phasors

It is also necessary to add to subtract two waveforms. If the quantity is in phase then there sum is just algebraic. but if they have a phase difference then we can use triangular law or parallelogram law of vector addition.

so this is the basics of the phasors we will also focus on the phasor diagram of the transformer, motors in future.it is easy to draw the phasors if you know the information of all quantities(EMF, current, flux, load current, magnetizing component). If you don't understand what the phasors are made a comment.