Microcontroller Based Constant Speed Low Cost Energy Efficient BLDC Motor Drive Using Proteus VSM Software

ABSTRACT: This paper presents a microcontroller based 120-degree six-step control algorithm for designing a low cost 3-phase trapezoidal back-emf permanent magnet BLDC motor drive for its variable torque constant speed applications. This has been done by controlling the voltage by using simple buck-converter topology. In buck converter, the inbuilt Pulse Width Modulation (PWM) feature of the PIC16F877A microcontroller has been adopted. The drive design is incorporated with feature for storing the dissipative energy during freewheeling period. This paper also introduces the application of Proteus VSM (Virtual System Modeling) software as a real-time simulation tool for modeling the BLDC motor drive for direct implementation of the compiled program following hardware implementation. Experimental verification has been carried out to validate the simulated circuit and close loop performance. Index Terms: BLDC Motor, PWM, PIC16F877A microcontroller, energy recovery, Proteus VSM Software. I