The main objective of this project is to control the speed of aBLDC motor and display its speed using an IR method of speed sensing mechanism. BLDC motor speed control is desired for various industrial applications,such asdrilling, lathes, spinning, elevators, etc. This proposed system provides a very precise and effective speed control system to increase or decrease the speed.
The project is divided into three stages: input, processing and output stage. Input stage consists of entering required speed through switches.Processing stage provides RPM reference of the motor, by a shaft mounted reflector to throw one pulse per rotation to IR sensor interfaced to themicrocontroller inthe circuit.
TheMicrocontroller developsPWM pulses which are varied with the switches to regulateDC power to motor such that the desired speed is achieved.
The output stage uses a MOSFET being driven by the microcontroller output.An 8051family microcontroller is used with a set of switches to increase or decrease the speed of the BLDC motor.
This speed is sensed by sensors and is given to the microcontroller which in turn displays it on a LCD display. The above operation is carried out by using one opto-isolator and a MOSFET for driving the BLDC motor. IR sensing is used for getting reference speed to the microcontroller.
BLOCK DIAGRAM
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Hardware Requirements
- 8051 series Microcontroller
- Level Shifter IC
- GSM modem
- LCD
- LED
- Crystal
- Relay driver IC
- Resistors
- Capacitors
- Diodes
- Transformer
- Voltage Regulator
- Opto Isolator
- Digital Energy Meter
- Lamp
Software Requirements
- Keil compiler
- Language: Embedded C or Assem
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