Voice enabled speed control of ac motor

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 03 Issue: 02 | Feb-2014, Available @ http://www.ijret.org 564
VOICE ENABLED SPEED CONTROL OF AC MOTOR
Prabhu.S1
, Sakulhameed.A2
, Sureshkumar.V3
, Arun.S4
1,2 & 3
P.G. Scholar, Dept of PG-ES, PACET, Tamilnadu, India
4
Asst. professor, Dept of EEE, PACET, Tamilnadu, India
Abstract
Communication plays a major role in day today’s life and can be used as a better tool in control systems. It deals with wire
communication and is used to control the motor speed. Out of all mechanisms, microcontroller hardware description language
proves to be efficient than al other mechanisms. Digital means of controlling gives accurate results compared to the
approximation of analog systems. Embedded technology is a key role in integrating the different functions connected with it. This
proposal generally reduces the manpower, operates efficiently and saves time without human involvement. With the advancements
in technology, the existing systems are developed to have in built intelligence. Due to the technological development whether it is
DC or AC machines the speed of the machine can be controlled by various methods. By means of the voice process the machine
can be controlled depending upon the application wired or in order to transmit the signal the wireless communication can be
used. By this way electrical technology is combined with communication technology and computer science. Now a day it is very
important thing to reduce the manual error and manual operation.
Index Terms—voice recognition, PWM, shaded pole induction motor
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1. INTRODUCTION
Nowadays many industries are using various technologies
for speed control of the motor. They are very much
interested in reducing the manual operations. So they are
using different kind of methods in day to day activities. Our
project also deals with reduction of manual operation by
combining various technologies such as electric drives
wireless communication and embedded technology. Here
voice communication plays a major role in this project. We
are using voice communication in different fields for various
purposes. Motor speed can be varied by different speed
control schemes at rotor side and stator side of the motor. In
stator side we have voltage control, frequency control and
pole changing method. In rotor side we have resistance
control, slip power recovery method, pwm technique, etc.
Pwm technique is a new one which mostly used for speed
control. Now we are going to control the speed of the motor
by voice recognition method. Small scale industries (SSI)
play a vital role in shaping the economy of the country. This
has special significance with reference to developing nations
like India with contributes in terms of large scale
employment generation and high labor to capital ratio. It is a
means for making the best use of surplus human resource
available in the country. They ensure the optimum
utilization of locally available resources and cater to the
needs of the local market. Thus SSI units contribute
positively towards the industrialization process. The Indian
small scale sector has a significant contribution in terms of
both industrial production and export. It is emerged as a
dynamic and vibrant sector economy[1].
1.1 VOICE RECOGNITION METHOD
Voice recognition is a technology in which the spoken
words can be translated into a text format. In this some of
the recognition system uses a training to convert a individual
speakers section of text into the voice recognition system.
This system observes the specific voice of the person and
that voice is tuned by means of recognition, which results in
accurate transcription. Speaker dependent system uses a
training concept. Speaker independent system does not use a
training concept. These concepts mainly concentrate on
who is speaking rather than what they are speaking "Voice
recognition" means "recognizing by voice", something
humans do all the time over the phone. As soon as someone
familiar says "hello" the listener can identify them by the
sound of their voice alone[2].The project is designed with
microphone, microcontroller, amplifier, pulse shaping
circuit and driver circuit with relay. The voice signal is
given as input to the microphone and its output is amplified
using an amplifier. The amplified signal is given to the pulse
shaping circuit. The pulse shaping circuit generates square
pulses which are given to the microcontroller. The pulse
waveform for switching ON & OFF of the different
electrical appliances used, are stored in the microcontroller.
The microcontroller is programmed to compare the received
pulse with the stored values and to activate the
corresponding relay driver circuits of the electrical
appliances.

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1.2 CONCEPT OF VOICE RECOGNITION
When the power supply is switched ON the LCD displays
“VOICE BASED ELECTRICAL APPLIANCE”. After few
seconds they will disappear. The input voice command
signal is given through microphone to voice recognition
circuit. The input voice command signal is given through
microphone to voice reorganization circuit. This circuit
consists of an inverting amplifier, differential amplifier and
voltage follower. The command signal from voice
reorganization circuit is given to the pulse shaping circuit to
convert the voice signal into pulses[3]. The converted pulses
are given to the microcontroller. The microcontroller
receives the pulse and is counted by the microcontroller in
built counter and the corresponding count value is displayed
in the LCD display. When the voice command signal is
applied, the corresponding counted value is compared with
the stored value. If it is matched the microcontroller sends
the command signal to any one of the relay driver circuits
and the corresponding relay driver circuit converts the
received signal to energize or de-energize the relay coil The
energize or de-energize of the relay coil turns ON or OFF
the corresponding appliance connected through it. Now the
LCD display displays the corresponding changes that had
happened to the appliance connected to the relay. Until the
next voice command signal is given the LCD display
displays the corresponding changes[4].
Fig 1. Block diagram of voice recognition control
2. MODULE DESCRIPTION
For voice controlled operation circuit is divided into
two as follows.
1. Transmitting circuit.
2. Receiving circuit.
Fig 2.Transmitter block diagram
An encoder is a device, algorithm, circuit transducer
software program, or person that converts information or
code from one form into another. UART is used for serial
communications over a computer or peripheral device serial
port because it is integrated circuit. MICRO
CONTROLLER AT89S51 is a low-power, high-
performance CMOS 8-bit Microcomputer with 4K bytes of
Flash programmable and erasable read only memory
(PEROM).
Fig 3.Receiver block diagram
A decoder is a device which does the reverse operation of an
encoder, undoing the encoding so that the original
information can be retrieved.
3. RESULTS AND DISCUSSION
Fig 4. Experimental Setup

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Voice from the user is first analyzed by micro phone and
is converted to a keyword such as A, B, C, D, E for a
particular speech.
A stands for „start‟,B stands for „slow speed‟, C stands for
„medium speed‟, D stands for „fast speed‟, E stands for
„stop[5]‟.
By this way required voice signal is converted from voice
recognizer as keywords and send to micro controller through
UART.Then Universal Asynchronous Receiver and
Transmitter transmits the signal from PC to micro controller
as serial input. Micro controller has already programmed by
the user for such keywords mentioned above. Here each
keyword has unique programming loop. Then it should be
transmitted. For this purpose signal should be encoded by
the encoder. For example, keyword A is encoded as
0000(for 4bit operation). Then it will be transmitted by the
transmitter circuit at certain radio frequency range. It will
cover the area about 10cm for signal receiving
operation[6],[7]. Each operation is indicated by the LCD
display.
3.1 SIMULATION MODULE
Fig 6. Simulation diagram
Fig 7. Simulation result
pulse generators generate pwm pulses which require speed
controlling operation here. Simulation shows the variation
of speed for different duty cycles. When duty cycle is high,
average output voltage of the thyristor will be more. So
motor operates at high speed. By reducing the duty cycle
speed can be reduced.
4. CONCLUSIONS
The speed of the motor is controlled for five stages only. In
future we can implement for maximum no of speeds by
increasing the coding in micro controller. So that we can
generate maximum number of pulses as per our requirement.
In this work, shaded pole induction motor is used. In speed
control process, dc motor is easier than ac motor since driver
circuit design is very simple. But due to the availability of
AC supply and considering the cost of the motor, AC motor
is used.
REFERENCES
[1]. Sharma.P.K et al.,”Real time control of dc motor drive
using speech recognition”, power electronics(IICPE),2010
India international conference.
[2]. Gulbins.H et al., “use of voice controlled and computer
assisted surgical system zeus for endoscopic coronary artery
bypass grafting” 1999.
[3]. Bilmes.J.A et al., “evaluation of voice based cursor
control techniques for assistive technology” 2008.
[4]. Landay.J.A et al., “a hands free voice driven drawing
application for people with motor impairments” 2007.
[5]. Hughes.J.F et al., “voice as sound using non verbal
voice input for interactive control” 2001.
[6]. Doran.M.V et al., “a voice operated tour planning
system for autonomous mobile robots” 2010.
[7]. Feiner.S et al., “using prosodic features of speech and
audio localization in graphical user interfaces” 2005.
BIOGRAPHIES
Prabhu.S received his B.E.,(Electrical
and Electronics Engineering) degree
from P.A College of engineering and
technology in 2012, and pursuing
M.E., (Power Electronics and Drives)
degree in P.A College of
Engineering and Technology Pollachi
Sakulhameed.A received his
B.E.,(Electrical and Electronics
Engineering) degree from
Subramanya College of engineering
and technology in 2009, and pursuing
Photo

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Sureshkumar.V received his
B.E.,(Electrical and Electronics
Engineering) degree from P.A
College of engineering and
technology in 2012, and pursuing
Arun.S received his B.E.,(Electrical
and Electronics Engineering) degree
from Sri Ramakrishna institute of
engineering and technology in 2007,
and received his M.E., (Power
Electronics and Drives) degree from
Anna university Coimbatore in 2010
and currently working as an
asst.professor in P.A College of

Voice enabled speed control of ac motor

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Voice enabled speed control of ac motor