The BLDC MOTOR DRIVE ANALYSIS ON TWO LEG INVERTER

Abstract

Earlier for variable speed application conventional motors were used, but these motors have poor
characteristics. These drawbacks were overcome by brushless Dc motor drive. Now days in most of the
applications such as industrial, domestic, aerospace, defense, medical and traction etc, brushless DC
motor (BLDCM) is popular for its high efficiency, high torque to weight ratio, small size, and high
reliability, ease of control and low maintenance etc. BLDC motor is a electronic commutator driven drive
i.e. it uses a threephase voltage source inverter for its operation, electronic devices means there is a
problem of poor power quality, more torque ripple and speed fluctuations. This paper deals with the CUK
converter two leg inverter fed BLDCM drive in closed loop operation. The proposed control strategy on
CUK converter two leg inverter fed BLDCM drive with split DC source is modeled and implemented
using MATLAB/Simulink. The proposed method improves the efficiency of the drive system with Power
factor correction feature in wide range of the speed control, less torque ripple and smooth speed control.