Speed Controlling Techniques of DC Motors using PWM Technique

CE 3.1 Project Information
Name of the project: Speed controlling techniques of DC motors using Pulse Width
Modulation (PWM) technique
Location of the project: [PLEASE FILL]
Project Duration: [PLEASE FILL]
Organization: [PLEASE FILL]
Role and Designation during the time: Associate Electrical Engineer
CE 3.2 Project Background
CE 3.2.1 Characteristics of the project
This particular project mainly discussed about various speed controlling techniques of
any DC motors with the help of both electrical and mechanical techniques. For getting any
desirable outputs, the function of speed control in DC motors becomes more important.
Moreover, in this project, for the controlling of DC Motor speed, Pulse Width Modulation
(PWM) technique is used. It also get cleared from this paper that the accurate control of any
small DC motors can be done by not including any types of complicated and costly circuit.
However, different controlling strategies were implemented with the help of output speed error
technique along with its derivative termed as feedback damping signals. The main benefit of
using PWM for speed controlling was the low percentage of power loss occurred in switching
devices. In addition to all these, in this project, AT89S52 Microcontroller was implemented to do
the generation of power with the help of Pulse Width Modulation. The main principle works in
this project mentioned about average power delivery which gets directly proportional with

modulation duty cycle. Furthermore, due to high modulation rate, it becomes easy to smooth the
pulse train with the help of passive electronic filters and also facilitate to recover any average
type analogue waves.
CE 3.2.2 Objectives developed for the project
In terms of initiating this project successful and the proper implementation of different speed
controlling techniques of DC Motors, I have used Pulse Width Modulation (PWM) technique
because of its minimal power loss. However, below are some objectives that can set for the
appropriate implementation of this project is discussed below:
To offer a simple and efficient technique for the controlling of DC motors speed with the
help of Pulse Width Modulation (PWM) technique
To operate the motor using pulse wave, based on microcontroller and IC circuit
characteristics.
To do the better designing and proper implementation of both hardware and software for
doing speed control of DC Motor and the occurrence of any overload condition
To prepare a system used for DC Motor speed controlling depending on constant speed
with respect of load condition
To design and implement of a proper microcontroller based closed loop DC motor speed
controller which helps to operate the DC Motor’s speed with the help of DC chopper
along with PWM technique
To represent a signal depending on the output of motor speed controller for the reduction
of total load of current.

CE 3.2.3 My area of work
As I was appointed as an associate electrical engineer and I was also just pass-out intern
in this project. I had only theoretical concept of electrical with no practical problems and
handling of different situation. Therefore, as an Intern, initially, I was asked to view the whole
project which helps to gain the in-depth knowledge regarding this project work. After initial
some days, I was assigned to study all types of available DC Motors and to select an appropriate
motor for this project. To select the required DC motor, I had used Flux Control Method,
Armature Voltage Control Method and the Armature Resistance Control based on difference in
field excitation along with the terminal voltage variation. In addition to DC motor selection, I
was asked for preparing the justification report of using PWM technique in this project which
was selected for its power adjusting technique based on 0% to 100% duty cycle. Apart from the
technical work, I was also asked to prepare detailed thesis report of the whole project along with
all specification and calculation work.
CE 3.2.4 Project Group
Project Supervisor
Team Leader
Project
Associate
Project
Associate
Manager
Asst. Manager