Abstract: Wireless sensors network (WSN) system are autonomous

Abstract: In
modern
generation the automation has become a basic need for
the industries. This paper propound a wireless control and observing system for
an induction motor based on Zigbee communication arrangement  for safe and economic data communication in
industrial fields where the wired communication is high precious or impossible
due to physical circumstances. This project has two parts that is transmitter
and receiver. In receiver section microcontroller is used for controlling
operation. A microcontroller based system is used for assembling and storing
data and accordingly generating control signal to stop or start the induction
motor wireless through computer interface developed with Zigbee.

1. Introduction

No other motors are
popular such as Single phase and three phase induction motors because of their
vast applications. Hence it becomes necessary to protect them against faults so
as to ensure uninterrupted operation and functioning.For other types ofmotorthere
are various parameter controlling and monitoring systems, but in case of
induction motor the controlling and monitoring systems are insignificantly used
due to high cost of installation and physical limitations. So as to reduce the
limitations in monitoring and controlling, Zigbee based system is used which
makes it cheap and simple than other. Before starting, first we have to know
what is Zigbeeprotocol?.Zigbee is a wireless communication device like
Bluetooth and Wireless Local Area Network (WLAN). Basic difference between
Zigbee and other communication propound is that all zigbee devices relay each
other’s traffic, by passing the wired network perfectly. While Bluetooth
devices connect to another wireless that acts as a focal point and WLAN devices
connect directly to an access point, which is wired to the enterprise network
using Ethernet. The Institute Of Electrical and Electronics Engineers (IEEE)
developed standards and helped the production of Zigbee
protocol and devices that support this protocol. The disadvantage of using
traditional systems is that it increases the cost whereas digital systems
reduce the cost of system. The basic structure of Zigbee based parameter
monitoring and controlling system consists of microcontroller board and Zigbee devices,
one set of microcontroller board and Zigbee device are near induction motorand
acts as transmitter for the other microcontroller and Zigbee device which is
near the computer where the parameters are displayed on computer using software
application. In addition to Zigbee device various other sensors are used for
measuring different parameters. Wireless sensors network (WSN) system are
autonomous and operate unattended also adaptive to the environment.

2.
ABOUT ZIGBEE TECHNOLOGY

2.1
WIRELESS SENSOR NETWORK

Wireless sensor
network systems areself- governingand operate disregarded also adaptive to the
environment. The wireless system for monitoring purposewill not only reduce the
overall monitoring system cost, but always provide flexibility in the system in
terms of distance or location. So these systems are widely used in military,
hospitals, home and other commercial areas. According to this feature the
Zigbee becomes the new standard planned for low cost devices in automation,
computer constituent and home controls. Zigbee standard performs well at
industrial environments. The fundamental design and implementation of WSN
promoting a high power transmission Zigbee based technology. The developed dais
is cost-effective and allows easily in WSN systems and as well as the effect on
reducing energy consumption.

2.2
ZIGBEE NETWORK STRUCTURES

There are three
network topologieswhich are used. They are star Network, Cluster-tree Network
and Mesh Network. Different network topologybuilt up by zigbee devices like
star topology cluster tree topology and mesh network. For all networktopology,
there can be only one coordinator in each network. In cartography there is a
coordinator which is responsible for all over the network. All other devices
are back-end devices and directly communicate with the coordinator. This
topologyis suitable for networks with a centralized device and for time
critical applications. Next is a cluster tree network where coordinators are
still dependable for the network initiating and maintenance. However, routers
can be used to extend the network. Routers control data flow by using
hierarchical routing strategies in the network. They also may imply beacon
enabled network that is defined in IEEE for periodical data transmission. In
mesh network coordinators seen s responsible for the network initiating and
maintenance.Routers can be used to extend the network. A mesh network allows
full peer to peer communication. A mesh relies on this way self-healing
technology so that if a node fails another route is used for the data delivery.

3.MONITORING
AND CONTROLLING SCHEMES

Thissection gives the
overview of the monitoring and controlling scheme of induction motor. A general
block diagram of the proposed schemes is given in fig.1 .A general block
diagram of monitoring and controlling schemes

  The whole system is divided into two parts
–transmitter and receiver. The monitoring data is simultaneously fed to the
microcontroller. This data is transmitted efficiently and smoothly to receiver
and through wireless zigbee communication protocol. The micro-controller at the
transmitter end is so programmed that if the monitoring parameters of induction
motor come out of the desired or safety limits, a signal will be generated by
the micro-controller which will energize the relay circuit and the contractor
cuts the mains supply to the induction motors.

The data receives at
the receiver end is transferred to the computer system through USB to serial
interface. Thus a continuous monitoring of the parameters of the induction
motor can be done from a remote location far away from the actual working
location. If the user any time wants to stop and start the induction motor, a
signal will be given by the computer system present at the receiver end, which
is communicated at the transmitter end through zigbee protocol. In turn the
micro-controller unit presents at the plant location generates a signal which
energizes and de-energizes the relay circuitry to start andstop the induction
motor respectively. Thus the system not only monitors the operation of the
induction motor but also protects it from the severe faults that commonly
occur.

4. RESULT AND
DISCUSSION

This paper concerned on the l studies on
simple motor load for speed control using wireless technology through the microcontroller.
The experiment is conducted by placing motor at distance of about 80-100 meters
and tested the motor to obtain various speeds by pressing the different keys in
the keypad. Here tON is maintained constant and tOFFis
varied accordingly. The speed of the motor for various keys selected in the
keypad.

Thus we can vary the speed of induction
motor by pressing  respective keys.

 Sr. no.

No. of Keys pressed

Status/speed in rpm

1

Key 1

ON

2

Key 2

OFF

3

Key 3

100

4

Key 4

200

5

Key 5

400

6

Key 6

700

7

Key 7

1100

 
Table: speed control for various keys selected in the keypad

5. CONCLUSION

With the help of the study,
a parameter monitoring system for induction motor based on Zigbee protocol is
achieved and tested successfully. The system developed is capable to perform
such operation as running the motor through RF, stopping it,
measuring,monitoring and controlling the most parameter of the motor like phase
current, phase voltage, wiring temperature, speed. All of these values can be
transferred to the host computer, display on the interface represents
graphically; monitoring and controlling the basic parameters of the induction
motor where examined and achieved in various ways. A new Zigbee technology is a
new wireless protocol is used for the communication. These protocol is widely
used various areas for it better reliability, low power consuming profile, excellent
capability, high flexibility and low cost so it’s significant to embed the
Zigbee protocol into the WSN system that widely applied now in every areas. The
system achieved can be used for industrial application. The whole system may be
very useful to colleges and research institutes that have occasional, technical
and industrial education.