Abstract: Inmoderngeneration the automation has become a basic need forthe industries. This paper propound a wireless control and observing system foran induction motor based on Zigbee communication arrangement for safe and economic data communication inindustrial fields where the wired communication is high precious or impossibledue to physical circumstances.
This project has two parts that is transmitterand receiver. In receiver section microcontroller is used for controllingoperation. A microcontroller based system is used for assembling and storingdata and accordingly generating control signal to stop or start the inductionmotor wireless through computer interface developed with Zigbee.1. IntroductionNo other motors arepopular such as Single phase and three phase induction motors because of theirvast applications.
Hence it becomes necessary to protect them against faults soas to ensure uninterrupted operation and functioning.For other types ofmotorthereare various parameter controlling and monitoring systems, but in case ofinduction motor the controlling and monitoring systems are insignificantly useddue to high cost of installation and physical limitations. So as to reduce thelimitations in monitoring and controlling, Zigbee based system is used whichmakes it cheap and simple than other. Before starting, first we have to knowwhat is Zigbeeprotocol?.Zigbee is a wireless communication device likeBluetooth and Wireless Local Area Network (WLAN). Basic difference betweenZigbee and other communication propound is that all zigbee devices relay eachother’s traffic, by passing the wired network perfectly. While Bluetoothdevices connect to another wireless that acts as a focal point and WLAN devicesconnect directly to an access point, which is wired to the enterprise networkusing Ethernet. The Institute Of Electrical and Electronics Engineers (IEEE)developed standards and helped the production of Zigbeeprotocol and devices that support this protocol.
The disadvantage of usingtraditional systems is that it increases the cost whereas digital systemsreduce the cost of system. The basic structure of Zigbee based parametermonitoring and controlling system consists of microcontroller board and Zigbee devices,one set of microcontroller board and Zigbee device are near induction motorandacts as transmitter for the other microcontroller and Zigbee device which isnear the computer where the parameters are displayed on computer using softwareapplication. In addition to Zigbee device various other sensors are used formeasuring different parameters.
Wireless sensors network (WSN) system areautonomous and operate unattended also adaptive to the environment.2.ABOUT ZIGBEE TECHNOLOGY2.1WIRELESS SENSOR NETWORKWireless sensornetwork systems areself- governingand operate disregarded also adaptive to theenvironment. The wireless system for monitoring purposewill not only reduce theoverall monitoring system cost, but always provide flexibility in the system interms of distance or location. So these systems are widely used in military,hospitals, home and other commercial areas. According to this feature theZigbee becomes the new standard planned for low cost devices in automation,computer constituent and home controls.
Zigbee standard performs well atindustrial environments. The fundamental design and implementation of WSNpromoting a high power transmission Zigbee based technology. The developed daisis cost-effective and allows easily in WSN systems and as well as the effect onreducing energy consumption.2.2ZIGBEE NETWORK STRUCTURESThere are threenetwork topologieswhich are used. They are star Network, Cluster-tree Networkand Mesh Network.
Different network topologybuilt up by zigbee devices likestar topology cluster tree topology and mesh network. For all networktopology,there can be only one coordinator in each network. In cartography there is acoordinator which is responsible for all over the network.
All other devicesare back-end devices and directly communicate with the coordinator. Thistopologyis suitable for networks with a centralized device and for timecritical applications. Next is a cluster tree network where coordinators arestill dependable for the network initiating and maintenance. However, routerscan be used to extend the network.
Routers control data flow by usinghierarchical routing strategies in the network. They also may imply beaconenabled network that is defined in IEEE for periodical data transmission. Inmesh network coordinators seen s responsible for the network initiating andmaintenance.Routers can be used to extend the network. A mesh network allowsfull peer to peer communication. A mesh relies on this way self-healingtechnology so that if a node fails another route is used for the data delivery.3.
MONITORINGAND CONTROLLING SCHEMESThissection gives theoverview of the monitoring and controlling scheme of induction motor. A generalblock diagram of the proposed schemes is given in fig.1 .A general blockdiagram of monitoring and controlling schemes The whole system is divided into two parts–transmitter and receiver. The monitoring data is simultaneously fed to themicrocontroller. This data is transmitted efficiently and smoothly to receiverand through wireless zigbee communication protocol. The micro-controller at thetransmitter end is so programmed that if the monitoring parameters of inductionmotor come out of the desired or safety limits, a signal will be generated bythe micro-controller which will energize the relay circuit and the contractorcuts the mains supply to the induction motors.
The data receives atthe receiver end is transferred to the computer system through USB to serialinterface. Thus a continuous monitoring of the parameters of the inductionmotor can be done from a remote location far away from the actual workinglocation. If the user any time wants to stop and start the induction motor, asignal will be given by the computer system present at the receiver end, whichis communicated at the transmitter end through zigbee protocol. In turn themicro-controller unit presents at the plant location generates a signal whichenergizes and de-energizes the relay circuitry to start andstop the inductionmotor respectively.
Thus the system not only monitors the operation of theinduction motor but also protects it from the severe faults that commonlyoccur. 4. RESULT ANDDISCUSSIONThis paper concerned on the l studies onsimple motor load for speed control using wireless technology through the microcontroller.
The experiment is conducted by placing motor at distance of about 80-100 metersand tested the motor to obtain various speeds by pressing the different keys inthe keypad. Here tON is maintained constant and tOFFisvaried accordingly. The speed of the motor for various keys selected in thekeypad.
Thus we can vary the speed of inductionmotor 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 keypad5. CONCLUSIONWith the help of the study,a parameter monitoring system for induction motor based on Zigbee protocol isachieved and tested successfully. The system developed is capable to performsuch operation as running the motor through RF, stopping it,measuring,monitoring and controlling the most parameter of the motor like phasecurrent, phase voltage, wiring temperature, speed. All of these values can betransferred to the host computer, display on the interface representsgraphically; monitoring and controlling the basic parameters of the inductionmotor where examined and achieved in various ways. A new Zigbee technology is anew wireless protocol is used for the communication. These protocol is widelyused various areas for it better reliability, low power consuming profile, excellentcapability, high flexibility and low cost so it’s significant to embed theZigbee protocol into the WSN system that widely applied now in every areas.
Thesystem achieved can be used for industrial application. The whole system may bevery useful to colleges and research institutes that have occasional, technicaland industrial education.