The experiment is on the DC motor modelling along with DC motor validation. The system of DC analysed in this experiment by the connection of hardware and software. The bump test method is done which depends on responses of the stable system.

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DC Motor Modelling Lab Report
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Experiment 1: DC Motor Modelling
Abstract
The experiment is on the DC motor modelling along with DC motor validation. The
system of DC analysed in this experiment by the connection of hardware and software.
The bump test method is done which depends on responses of the stable system. By the
simulation, the modelling parameters founded in this study. K is steady-state gain and ?
is time constant. In the validation, the values of K and ? tested to get the better output
results of the rotation of the DC motor. This study discusses the theory of experiments.
The results are obtained through practical evaluation and calculation.
Keywords: modelling parameters, steady-state gain
Introduction
A DC motor is the machine which transforms the electric energy in mechanical energy in
the form of the rotation. The movement of the DC motor produced through physical
electromagnetism behaviour. DC motors also have the inductors and create a magnetic

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field which used for generating the movement. In the DC motor modelling, the motor
converts electrical current armature n mechanical torque that applied to shaft. An applied
torque then produces the velocity to inertia and friction of load and motor. The common
device usually used as the actuator in the mechanical control is DC motor [1].
In this study, the experiment is done on DC motor modelling. The theory of the
experiment discussed and it also evaluates the results on the basis of the experiment
performed with the connection of both software and hardware. This study shows the
phase experiment of DC motor about modelling.
Theory
In the experiment, there has a DC motor which works on the circuit. A DC motor has a
disc which is coupled with it. It operates with software to control the speed of the disc in
DC motor. The software that is used DC motor modelling is LabView for the phase
section. The hardware is connected to the computer and when Dc motor rotates the
output of the motor comes on the software. The signal of the motor fluctuating On and Off
square wave and continuous in 10 sec. The input seems to be in the square wave in 0 and
1. To control the speed of the motor, the motor will model. For modelling, the values of
amplitude, K and frequency adjusted. I modelling the DC motor corresponding speed
along with the voltage responses as in input. The experiment takes the speed of the
measurements of responses.
In the signal generator, the amplitude is 2V, frequency is 0.4 HZ and offset is 3.0V in 10
sec. The peak value of the output signal also evaluated. The bump test method is the test
on the step response for a stable system. With the chosen constant input, the system
reaches on equilibrium and input change to the new level which records the output [2].
The modelling parameters K and ? are calculated by bumptest method.
K= ?y?u
As y is the speed difference and u is the voltage input difference. And the
model time constant is:
?=t1-t0
Model validation is done in the experiment. In the validation process, the value of K
increased and the value of ? decreased. In this way, the input and output signal match
and complete the modelling of the Dc motor.
Result and discussion

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At the start of the experiment, the input and output signal simulation evaluated. When
the software is run, then automatically the hardware disc run. When the signal generates
ON/OFF the time noted. The motor speed has the input in time at which input has 1V and
output tries to be the similar input shape and reaches steady-state value. In the 3V
amplitude, the speed is high. If the frequency is less, then there would be less repetition of
the signal. On 0 frequency, there is no repetition in the signal. The speed and voltage used
for computing the steady-state gain of DC motor as it is the time-constant [3].
DC motor has a disc which rotates and gives transitional motion and generate a signal in
the software. The square signal produce and input signal and output signal have
amplitude and frequency differences among them which modelled to make the same
signal. For this purpose, the modelling and validation are done in this experiment by
changing the values of modelling parameters. The speed of the motor has a similar shape
as simulation with fluctuation because of the external factors. The experiments explain
the modelling of DC motor by evaluating DC motor responses. The experimentation is
done by using the open-loop system. The calculated values in the experiment give a much
better response of the system and values of K and ? are calculated to achieve the
response.
Conclusion
It concludes that the purpose of the experiment is successfully achieved. Both model
validation and bump test method shows the best results in the experiment. The modelling
of the DC motor is done on the Lab View software. The modelling of DC motor
comprehends response and also performs system because of different input signals and it
can be improved in further modelling perform. The variation of speed in the modelling
also evaluated which needs more experimentation.
References
[1] M. R. Mohamed, "Control of dc motor external resistor starter by using armature
current decay sensing technique," ARPN Journal of Engineering and Applied
Sciences, vol. 11, no. 7, 2016.
[2] D. Mathew and M. Witson, "Modelling of BLDC Motor, Using LabVIEW Software,"
2015.
[3] D. M. S. S. Modeling, "DC Motor Speed: Simulink Modeling," 2015. [Online].
Available: http://ctms.engin.umich.edu/CTMS/index.php?
example=MotorSpeed&section=SimulinkModeling.

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