The project reveals the digital closed loop control system for speed and temperature control of DC motor using Pulse Width Modulation (PWM) inverting technique for speed control and closed loop negative feedback technique for temperature control.
The project basically consists of micro controller MCS51 series 89C52 and motor driver, thermal sensor, comparator, key pad,16X2 dot matrix LCD display and rotation feedback sensor (optical encoder). The program is written in micro controller to take the input values from the user, then rotates the motor by placing 50% duty cycle pulse on the motor. The motor is rotated at X RPM speed, can be detected by using feedback sensor and micro controller. If the speed is above the specified speed then the micro controller continuously reduces the duty cycle till the speed comes to a predetermined level. If the detected speed is less than the predetermined speed then the micro controller continuously increases the duty cycle till the determined level. The micro controller keeps on tracking the determined speed by varying duty cycle in a closed loop control system.
Simultaneously, the project traces for the temperature of DC motor with the help of thermal sensor and comparator. If the temperature is greater than the pre determined level, then the motor automatically stops and gives a long beep alarm and the same thing is displayed on the LCD display. It starts the motor again after tracing the temperature and finding it in the desired level.
The project basically consists of micro controller MCS51 series 89C52 and motor driver, thermal sensor, comparator, key pad,16X2 dot matrix LCD display and rotation feedback sensor (optical encoder). The program is written in micro controller to take the input values from the user, then rotates the motor by placing 50% duty cycle pulse on the motor. The motor is rotated at X RPM speed, can be detected by using feedback sensor and micro controller. If the speed is above the specified speed then the micro controller continuously reduces the duty cycle till the speed comes to a predetermined level. If the detected speed is less than the predetermined speed then the micro controller continuously increases the duty cycle till the determined level. The micro controller keeps on tracking the determined speed by varying duty cycle in a closed loop control system.
Simultaneously, the project traces for the temperature of DC motor with the help of thermal sensor and comparator. If the temperature is greater than the pre determined level, then the motor automatically stops and gives a long beep alarm and the same thing is displayed on the LCD display. It starts the motor again after tracing the temperature and finding it in the desired level.
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