DQ-axis modelling and field oriented control of hybrid flux motor

Abstract

This paper presents a prototype of three phase hybrid flux motor (HFM) with a power rating of 1.2 kW that validates the concept of hybrid flux topology (combining longitudinal and transverse flux topologies). Conventional dq-axis model of three phase electric motor is based on rotating magnetic fields, which cannot be applied to the HFM due to its pulsating magnetic field. In this work, a dq-axis model is derived for HFM that can be applied to any pulsating magnetic field motors. With the developed dq-axis model, a field oriented control (FOC) is simulated for the HFM. This simulation details the design, tuning, and stability of PI controller using step response, root locus, and Bode plot. A step-by-step process of experimental implementation of FOC is elaborately discussed in this article, which will be of interest to engineers working on motor control. Based on the FOC developed, a load test is performed on the HFM and compared to the finite element analysis results. Laser cutting is used in the fabrication of the HFM prototype to make stator and rotor core laminations. This paper explores the effect of laser cutting on the performance of HFM prototype.