Work

A Comprehensive Investigation of Low-Cost Permanent Magnet Machines with Ferrite Magnets and Enhanced Magnetic Loading

Year: 2025

Type: conference-paper

Abstract: Low-cost ferrite permanent magnet (PM) machines are promising alternatives to conventional machines that rely on expensive rare-earth PMs (RE-PMs). However, the inherently low energy density of ferrite PMs leads to reduced magnetic loading, posing a significant challenge in achieving comparable power density and compact machine size. To address this, specialized rotor pole configurations tailored to the characteristics and limitations of ferrite PMs are necessary. This study presents a comprehensive investigation and comparison of four rotor topologies featuring enhanced magnetic loading through the use of the flux focusing effect. The presented configurations include: (1) spoke-type poles, (2) combined spoke-type and V-shaped poles, (3) double V-shaped poles, and (4) multi-stage flux barrier poles. To ensure a fair comparison, all designs are optimized to maximize torque under identical armature design, current density, air gap length, etc. The topologies are evaluated in terms of air gap flux density, open-circuit back-emf, torque-speed characteristics, and efficiency across a wide torque-speed range. To validate the simulation results, a ferrite PM machine is prototyped and experimentally tested.

Source: International Conference on Electrical Machines and Systems (ICEMS)

DOI: 10.23919/icems66262.2025.11317286

Authors: Akbar Mohammadi Ajamloo, Frederik Desmet, Peter Sergeant, Mohamed N. Ibrahim

Institution: Ghent University

Language: English

Topic: Electric Motor Design and Analysis

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: green

Funder: European Commission