Differentially Compounded DC Generator — The Engineering Knowledge

4 min readJan 25, 2021

Hi, readers welcome to a new post in this post we will have a detailed look at the Differentially Compounded Dc Generator. Before going to start detailed about these generators you must study the CUMULATIVELY COMPOUNDED DC GENERATOR. that we discussed in the previous post. DC generator is such a device or machine that used to transform mechanical power provided by the primer mover in the ac power.

There are many types of dc generators such as shunt dc generator, series dc generator, compound dc generator, etc. In this post, we discuss detail the Differentially Compounded DC Generator its working, operation, and some other related parameters. So let’s get started with Differentially Compounded DC Generator

Introduction to Differentially Compounded DC Generator

Note that armature current direction away from the dotted point of windings but shunt field current is moving towards the dotted windings point.
The equation of MMF for these generators is written here.

Fnet=FF-FSE-FAR

Fnet=NFIF-NSEIA-FAR

Ieq=-NSE/NF x IA-FAR/NF

IF’=IF+Ieq

IF’=IF-NSE/NF x IA-FAR/NF

Terminal Characteristic of a Differentially Compounded DC Generator

VT=EA-IA(RA+RS)

With the armature current increment, the MMF series field windings increase FSE=NSEIA. That results in a decrement in the net MMF of generator Ftot=NFIF-NSEIA due to this effect net flux of the generator decreases.
Flux decrement reduces internally generated voltage that decreases terminal voltage.
As these 2 factors decrease the terminal voltage with the load increment on the generator.
The characteristic curve of a differentially compounded dc generator is seen here.

Voltage Control of Differentially Compounded DC Generators

As the voltage loss features of differentially compounded dc generators are worse but they can be set the value of terminal voltage for respective load.
The method for voltage adjustment of the terminal is similar to the shunt and cumulatively compounded dc generator.
There are mentions here.
Vary the speed of rotation of Wm.
Vary the IF.

Graphical Analysis of Differentially Compounded DC Generator

the voltage characteristic of the differentially compounded dc generator is shown in graph find accurately in a similar way that we discussed in cumulatively
compounded dc generator.
To measure the terminal characteristics generator show this figure.

The part of effective shunt field current due to shunt windings is equal to the VT/RF because a high current exists at the shunt field windings.
The field current remainder is shown by Ieq and is the summation of series windings and armatures reaction.
This resultant Ieq current denotes the negative horizontal distance across the axes of magnetization curvature as both series field and armature are destructive.
The resistive losses of the generator is mention by IA(RA+Rs) that is length about the y axis at the curve. To measure the value of output voltage for respective load find an area of the triangle created through resistive voltage losses and equivalent current Ieq and determine the one location where it accurately relies on among the IF line and MMF curve.

That is a detailed post about the Differentially Compounded DC Generator. If you have any further query ask in the comments. Thanks for reading. I tried my level best to provide quality knowledge to you. Have a nice day.

Author: Henry

http://www.theengineeringknowledge.com

I am a professional engineer and graduate from a reputed engineering university also have experience of working as an engineer in different famous industries. I am also a technical content writer my hobby is to explore new things and share with the world. Through this platform, I am also sharing my professional and technical knowledge to engineering students.

Originally published at https://www.theengineeringknowledge.com on January 25, 2021.