Introduction to H-Bridge Fed Dc Motor Speed Control Mini Project:

There are various methods for controlling the speed of the DC motor but they require huge equipment and they require high additional costs. The proposed method is a h bridge fed method which is used for controlling the speed of the DC motor and it is operated by using a microcontroller. By using this method the various in the speed can be adjusted automatically by the microcontroller. In this paper we will see how the microcontroller based design is implemented using h-bridge fed method.

Brief on the working model and design:

To control the speed of the motor we design a PID which is control loop feedback mechanism. In this we use a h-bridge with MOSFET which controls the dc motor input voltage by using PWM technique. The MOSFET allows the bidirectional movement of the DC motor which allows the speed control. By using PWM technique the speed variations can be adjusted easily by reducing the harmonics and not affecting the starting torque.

In order to modulate the current to the dc motor the operating power is turned on or off which is the duty cycle. The duty cycle gives the speed of the DC motor. For this design we will be using an 89C51 microcontroller which has 8KB of flash memory which is best suited for programming our application. The microcontroller program is written in embedded c and is loaded into the flash memory by using keil software.


The proposed design of H-bridge method speed control device can even work under large currents. This is effective and the reliable design for controlling the speed of motor. As we are using a microcontroller design the speed adjustments are made automatically. This type of device can also be used in industries for controlling the devices.

Download  ECE and EEE Mini Project Report for H-Bridge Fed Dc Motor Speed Control.