Abstract: A Microprocessor-Based Motor Speed Controller is an intelligent electronic system designed to precisely control the speed of electric motors using a microprocessor or microcontroller. The primary objective of this system is to achieve accurate, efficient, and automated control of motor speed for various industrial, commercial, and domestic applications. This is accomplished by interfacing sensors, power electronics, and control algorithms with a programmable microprocessor. In traditional motor control systems, speed regulation is typically done manually or using analog control circuits, which are prone to inaccuracy, drift, and lack of flexibility. A microprocessor-based system offers higher precision, programmability, and real-time adaptability. It can monitor various inputs such as desired speed (from a user interface), actual motor speed (from sensors like tachometers or encoders), load conditions, and environmental parameters. Based on this feedback, it dynamically adjusts the power delivered to the motor using techniques like Pulse Width Modulation (PWM), Phase Control, or Variable Frequency Drive (VFD), depending on the motor type (DC, AC, or Stepper). The microprocessor serves as the core controller, executing an algorithm to compare the setpoint (desired speed) with the measured speed, and generating appropriate control signals to reduce the error. This closed-loop control improves system performance, minimizes power loss, and extends motor life.
In this project, hardware components such as motor driver circuits, analog-to-digital converters (ADC), digital-to-analog converters (DAC), power supplies, and displays are integrated with the microprocessor. Software is developed (typically in assembly or embedded C) to implement the control algorithm, user interface, and diagnostic features.
Keywords: Microprocessor, Motor Speed Control, PWM (Pulse Width Modulation), DC Motor, Sensor Feedback, Embedded Systems, Speed Regulation, Microcontroller, Automation, PID Control
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