Abstract: Direct current (DC) motor has already become an important drive configuration for many applications across a wide range of powers and speeds. We can easily control the performance of the DC motors and ensure that the number of applications using them will continue to grow for the future. In this paper it has presented the realization of the speed control by using Pulse Width Modulation.PWM is generated using Microcontroller 8051 and to drive the motor, H-bridge is used which is made up of four MOSFETs. Precise control of low torque DC motor is obtained by using simple and inexpensive hardware. This paper shows that accurate and precise control of small DC motors can be done effectively and efficiently without using complicated circuitry and costly components.

Keywords: DC motor, H-bridge, Pulse Width Modulation.