ABSTRACT:
The main target of this project is controlling the speed of BLDC motors and displays its speed utilizing an IR technique for speed sensor mechanism. The DC motor has different application utilized as a part of enterprises like in drilling, lathes, spinning, elevator and so on.
The speed control of the DC motors is very essential. This proposed framework gives a very precise and effective speed control framework. The client can increase or decrease the speed according to the requirement and the motor will keep running at that exact speed.
The project is partitioned into three phases: input, processing, and output stage. The input stage consists of entering the required speed through switches. The preparing stage gives RPM reference of the motor, by a shaft mounted IR sensor interfaced to the microcontroller in the circuit.
The microcontroller develops PWM pulses which are varied with switches to regulate DC capacity to the motor to such an extent that the desired speed is achieved. The output arrange utilizes a MOSFET being driven by the microcontroller output.
An 8051 family microcontroller is utilized with a set of switches to increase or decrease the speed of the BLDC motor. This speed is detected by the sensors and is given to microcontroller which thus displays it on a LCD display. The above task is completed by utilizing one opto-isolator and a MOSFET for driving the brushless DC(BLDC) motor. IR sensing is utilized for getting the speed reference to the microcontroller
