Wireless Speed Synchronization of Motors in Industry
Abstract
In textile industry many processes require speed synchronization of more than one motors involved in the process. Rolling of cloth should be synchronized with the speed of weaving spindle to avoid damage and motor speed synchronization is vital in conveyor belt driven by multiple motors. Abrupt load variations may cause hunting or oscillatory behavior in d. c. machines. This behavior can be detrimental to the process. The digitally controlled d. c. machines can have much aggravated phenomenon owing to poor sampling period selection. Traditionally processes are synchronized through mechanical transmission system consisting of a line shaft gears, pullers etc. This project is synchronization of multiple motors using wireless technology
This project uses radio frequency to synchronize motor speeds. One motor acts as transmitter and all the rest as receivers. Thus, if a particular speed is set in the transmitter then all other motors speed would be matched to the same speed of the main motor.
The mode of communication is radio frequency. BLDC motors used operate on the basis of PWM control. Each motor has a closed loop feedback mechanism providing RPM reference by a shaft mounted IR sensor arrangement whose output is fed to the controller in the circuit. A display unit displays the full speed and one can enter the desired percentage with help of a keypad to obtain the required speed for all the motors. Manpower and time is also saved in this system.
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Introduction
Direct current (DC) motors have been widely used in many industrial applications such as electric vehicles, steel rolling mills, electric cranes, and robotic manipulators due to precise, wide, simple and Continuous control characteristics. The development of high performance motor drives is very important in Industrial as well as other purpose applications. Generally, a high performance motor drive system must have good dynamic speed and load regulating response. DC drives, because of their simplicity, ease of application, reliability and favorable cost have long been a backbone of industrial applications. DC drives are less complex with a single power conversion from AC to DC. DC drives are normally less expensive for more horsepower ratings. DC motors have a long tradition of use as adjustable speed machines and a wide range of options have evolved for this purpose. In these applications, the motor should be precisely controlled to give the desired performance traditionally rheostat armature control method was widely used for the speed control of low power dc motors. However the controllability, cheapness, higher efficiency, and higher current carrying capabilities of static power converters brought a major change in the performance of electrical drives.
Conclusion
The project “speed synchronization of multiple motors in industries using microcontroller”. We can tabulate different speeds of motor as we keep on giving input from the Keypad and same speed change can be observed and displayed at the receiving motors. From this project we can successfully control the speed of multiple motors wirelessly through RF communication. Whatever the percentage of speed that we enter at transmitting unit of system same can be observed at the receiving motors. The whole operation is made simple by using wireless technology.