Abstract:
With the advances in the technology, new inventions are taking place on daily basis and following this trend the electronics industry is flourishing a lot. In the electronics industry the home appliance’s industry is in a lot of limelight these days. Almost all of the home appliances may it be an air conditioner, a cooler, a microwave, a refrigerator or washing machine all are making use of motors and that’s from where the BLDC motors are getting across the board consideration. The reason for getting such a great deal of attention are the remarkable characteristics that the Brush Less Direct Current (BLDC) motor possess which include no noise, higher efficiency, compact size, and more speed. These are the characteristics that make the BLDC motor superior than the normal DC motor and this is main reason for the widespread attention the BLDC motors are getting. Despite such useful attributes the BLDC motors are still not so common in the market. The reason why the BLDC motors aren’t employed as commonly as the DC motors is because of the complex control they possess and that’s where our project lies. In our project we are making a BLDC motor controller and controlling the speed of the motor by varying the knob of potentiometer. In order to control the speed of the motor we are making the use of the back EMF sensing methodology and thus controlling the speed using the feedback information. We are controlling the speed of motor by providing a DC supply to the switching circuit which after switching goes to the BLDC motor and rotates it, then the back EMF values are collected and given to the controller circuit which gives the value accordingly to the switching pattern and the same procedure is repeated thereby running the BLDC motor by back EMD approach. We are controlling the speed of the motor manually by changing the value on potentiometer and then adjusting the speed of the motor accordingly. We are also making use of an 8051 microcontroller which is providing the commutation pattern. Following this approach a microcontroller based back EMF sensing BLDC motor controller is built which can be used in variety of electronics.
