Reconfiguration of Propulsion System Topology Using Axial Flux Machines in Electric Vehicles

V Ramesh Babu, Et Al

doi:10.17762/turcomat.v12i2.1088

Abstract

In this paper, an effort is made to reduce the size, weight and cost of Electric Vehicles (EVs) with the reconfiguration of propulsion motor topology. The new machine topology has been advantageously used to replace the conventional motors. A Twin Rotor Axial Flux Induction Machine (TRAFIM) having higher power densities, shorter axial lengths than classical Radial Flux Machines have been implemented in this work. This further reduces the other complexities associated with the mechanical differential which is indented to provide different speeds to two wheels in necessary conditions. The performance of EV has been remarkably improved with the proposed reconfiguration. This paper presents a comprehensive analysis of an EV with the adoption of Twin Rotor Axial Flux Induction Machine (TRAFIM).

Highlights

The fluxes representing the stator and rotor of a rotating electrical machine interact on each other and become responsible for the production of torque
To carry out the simulation studies to access the performance of the power electronic differential in Electric Vehicles (EVs), a software package called VEHICLE-SIMULATOR X has been used
This paper highlights the advantages of Axial Flux Machines like reduced size, reduced weight and low cost for Electric Vehicles (EVs) applications

Summary

Introduction

The fluxes representing the stator and rotor of a rotating electrical machine interact on each other and become responsible for the production of torque. Based on the direction of flux in air gap with respect to the axis of shaft, the rotating electrical machines are categorized into Radial Flux Machines (RFM) and Axial Flux Machines (AFM). The Axial Flux Machines operate at moderately low speeds at high torques and this consideration has become boon for vehicle mobility applications (Metin, 2002). In Radial Flux Machines, the conductor is placed axial to the shaft axis and the flux directs radially between stator and rotor (Latchoumi, 2020). In Axial Flux Machines, the conductors are placed radially and the flux direction in air gap is axial to shaft axis (Ramesh Babu, 2012; Ramesh Babu, 2012). The Axial Flux Machines are compact in size, lighter and exhibit higher power densities comparatively These machines can be fabricated in different topologies to have single or multiple air gaps and are illustrated in Fig-2.

Proposed Topology

Modelling of Trafim

Simulation Results

Validation of results

Conclusions