Control of Four-Switch Inverter, Three-phase Brushless DC Motor Drive, using Finite-Set Model Predictive Control (FCS-MPC)

Abstract

The use of brushless DC or three-phase BLDC motors has grown significantly during the last decade in many variable speed applications, especially at home, due to their superior advantages such as high efficiency and easy control. Common drives of these motors use six-switch inverters with Hall effect position sensors. In order to use these motors as much as possible in mass production and domestic applications, reducing the drive cost of these engines has been the focus of industries and researchers. Cost reduction has been achieved by reducing the number of electronic power switches, removing position sensors, etc. BLDC motor drive with four switch inverter by removing two switches reduces the cost and increases the reliability, but removing two switches causes a significant torque pulse, which requires the adoption of a method to improve the performance of the motor. There are suitable controls. In this article, the finite control set, model predictive control method (FCS-MPC) is used in this drive structure. The proposed MPC controller is placed instead of the phase current controllers, and by selecting the optimal voltage vectors, it minimizes distortions and torque pulses. Validity and performance of the proposed MPC method are validated by performing simulations and comparing the results with other existing methods.