Linear Dc Machine Working, Construction And Application

Hello, readers welcome to new post. In this post we will have a detailed look at Introduction to Linear Dc Machine. Dc machine is a device that operates and generates dc current. The DC generator is such DC machine that generates dc power and the dc motor is a dc machine that uses dc power to work. The common types of DC machines are DC shunt generators, dc series motors and generators, dc compound motors, and generators.

In this post, we discuss the linear DC machines that will help us to understand of practical dc machines. So let get started with LINEAR DC MACHINE.

Table of Contents

Introduction to Linear DC Machine

Linear dc machines is the basic category of dc machines it working operation and other parameters are related to practical dc machines like motors and generators

The linear dc machine can be seen in below figure

It comprises of battery with a resistor linked with each in the use of a switch that makes frictionless rails.
The expression of the force applying on the wire in the existence of a magnetic field is mentioned here.

F i(I X B)

Here

F denotes the force applied on wire
i is the magnitude of current flowing in wire
I is the length of wire,
B is the magnetic flux density
The expression of the voltage produced in the moving conductive wire is in the field is mentioned here.

eind= (vXB) .l

eind denotes voltage in the wire
v denotes the velocity of the wire
B indicates magnetic flux density
I is the length of the conductor
If we apply KVL to the circuit shown in the above figure then we have.

VB – iR – eind = 0

VB=eind+IR=0

Newton law about the bar will be.

Fnet=ma

Starting Condition of Linear DC Machine

The diagram shown below indicates the linear dc machine starting requirements.

For starting the machine just push the switch. In result, current flows in the conductor that can be friends through the KVL.

As the conductor bar is in the static state a start eind or induced voltage value is zero. In a result above equation become i=VB/R
The current passing in the conductor through the tracks.
According to equation F i(I X B) the current passing in the conductive wire in the existence of magnetic field generates force at the conductor wire.
Since the structure of the machine, the equation for force is.

Find = ilB at right side

So the conductor will move in right side according to Newton’s law. Though the velocity of the conductor start to increase there is voltage that exists about the conductor.
Now voltage equation is

eind=vbl in up direction

The voltage decreases the current passing in the conductor applying the KVL we have.

so eind rises the current will reduce according to the above equation.
In consequence, the conductor will now in constant static condition here total force at the bar is 0
This exist when eind rises to the value of VB.
For this condition, the bar will have speed of movement

VB = eind = vssBI

Vss=VB/Bl

The conductive bar will last to continue this speed when zero load link to it till exterior force is applied to it.
At start of motor the velocity v produced the voltage eind current and force shown in below figure.

The conclusion of linear dc machine starting conditions is mentioned here.
If the switch is pushed then generates current movement in the i=VB/R,

The current generation force at the conductor is mentioned here F=ilB.
The conductor move to the right side generating an induced voltage.
The voltage generation decreases the current movement i=(VB-eind)/R
The force produced is now reduced this condition is also followed by the practical dc machine.

How Linear DC Machine work as a Motor

Suppose that at the start there is no load linked to the linear machine according to the requirements discuss above.
If the load is connected to it then when outcomes will be.
TO observe this see the below diagram,

In this condition, Fload is given to the conductor that is reversed to the motion direction.
AS the conductor at the start is in the steady condition the force applied Fload will outcomes in total force at the bar in the direction contrary to the movement direction.
(F net = Flaod – Find)
The factor of this force causes to decrement in the speed of the conductor Like the start speed decreases the induced voltage at the conductor decreases.
with the voltage decrement current also decreases.

So the induced force also increases The net outcome of this happening is the induced force increases till it becomes similar to the force of load and the conductor then moves in steady condition now it has less speed.
If load is connected to the bar the velocity-induced voltage current and induced force can now seen here.

There is induced force in the direction of movement of conductor and power is then transformed from electric to mechanical for retaining the conductor in movement condition.