Speed control with load sharing capabilities for multi-three phase synchronous motors

The on-going electrification transportation system revolution has already started and the continuous evolution of power electronics allows new and more reliable system layouts and control strategies to be investigated. Mainly, this revolution is driven by increased reliability levels. Since multi-three phase motors are fault tolerant by definition, they are a very good candidate for more reliable transportation systems. In this work, load sharing in multi-three phase synchronous motors is presented. For better explaining the new possibilities introduced in transportation systems by multi-three phase motors, few examples relative to a DC micro-grid for aerospace applications are provided. Analytical equations and experimental validation of speed control with load sharing capabilities are given by means of Matlab/Simulink simulations and by experimental on a 22kW test rig.

I. Introduction

The electrification transportation system had started at the beginning of the last century with railways [1]. After more than one hundred years, power electronics together with renewable energy sources and storage devices advancements have launched a proper propulsion system revolution. In this context, multiple research projects for transportation systems, i.e. aerospace [2], [3], mining machines [4], [5], ships [6], [7], and road vehicles [8] have been founded by governments and innovation centres around the world. Whenever higher reliability levels are demanded, multi-three phase motors can make the difference [9], [10].