Torque-Ripple Minimization for Brushless DC Motor Based Upon Cuk-Converter Using Hysteresis Current Controller

In the medical field application, the wheelchair facilities are commonly used for people who suffer in walking. Here this, project concentrates the working model of BLDCM, converter circuitry design of automated wheelchair and cruise controlling of BLDCM and also to suppress the torque disturbance of Brushless DC motor based upon Cuk-converter using Mode Switching Circuit (MSC) with the support of Hysteresis Current Control (HCC). To enhance the usage capacity of converter, here the Cuk-converter is provided. The Cuk-converter has two output modes which is categorized into boost and buck-boost technique. During the period of commutation, Cukconverter shoot up the voltage of the inverter circuit and provide the necessary voltage for the operation. During the normal period of commutation Cuk-converter works in the buck-boost technique by performing with help of amplitude modulation method. In the conventional pulse duration or width modulation method, speed is controlled by varying the three phase inverter voltage at low speed. To attain the higher speed usage of BLDCM drive unit with Cuk-converter using hysteresis current control method is more effective for reducing torque-noise. The advantage of using hysteresis current control method which reduces the heat produces in the inverter three phase circuit, current sensing range can be narrowed and mechanical vibration can be solved. The Simulink/Matlab platform is used to analyse the torque ripple percentage values from the graphical characteristics and also the minimization of torque ripple based on Cuk-converter in BLDCM using hysteresis current control (HCC) method also done in this project.