Multi-Level Voltage Space Vector Structure Based Control Strategy With Reduced Torque Ripple for Open-End Winding BLDC Motor Drives

This article presents a new multi-level voltage space vector structure-based control scheme for dual inverter-fed open-end winding BLDC (OEW-BLDC) motor drives, incorporating peak current control. An analysis of the voltage space vector structure of the OEW-BLDC motor drive is carried out first to identify the voltage vectors for developing two distinct PWM schemes tailored for low-speed and high-speed operations of the drive. The proposed scheme reduces the torque ripple in the drive due to the substantial reduction in the magnitude of the error voltage vectors while implementing the PWM scheme. In addition, this scheme ensures that only one inverter is switched at a time and the other inverter is clamped at a particular level, thereby reducing the switching losses. The multilevel voltage space vector structure-based switching also ensures that dv/dt is reduced substantially. The proposed scheme is verified by simulation as well as experiment on a laboratory prototype, employing a TMS320F28377S digital signal controller to implement the control algorithm.