Design of control system for 4-switch BLDC motor based on sliding-mode and hysteresis controllers

Abstract EN

This paper presents a design of a complete dual-loop controller for 4-switch brushless dc motor.

In low power, low-cost applications, the 4-switch inverter topology is a felicitous alternative of the ordinary 6-switch inverter.

The controller of the 4-switch BLDC motor has to be uncomplicated and can be implemented without the use of expensive hardware to avoid increasing the overall cost of the drive system.

Furthermore, the control must be able to deal with the known problems of the 4-switch drive which are speed limitation and high ripple torque.

The proposed controller comprises sliding mode speed control and direct current hysteresis control.

To investigate the performance of the proposed design, the system is modeled by using Matlab/Simulink, the results are obtained for different working conditions.

The propitious results certify the applicability of the proposed controller in low-cost 4-switch BLDC motor drive systems