Flexible Control for Wide Speed Range Operation of High Polarity Stator Coreless AFPM Machines with WBG Semiconductor Devices

Yaser Chulaee, Ali Mohammadi, Aaron Cramer, Dan M. Ionel

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

This paper presents a dual-mode controller designed to enable a high-polarity coreless stator axial flux PM (AFPM) machine to operate over a wide range of speeds. The proposed approach includes a combination of sine-wave (field-oriented) and square-wave control schemes. Coreless machines offer the advantage of being effortlessly controlled using square-wave voltages, thanks to the absence of core losses and negligible torque ripple caused by the lack of a magnetic core. By adopting square-wave control, the need for high-precision encoders is eliminated, enabling the utilization of Hall effect sensors or sensorless drive schemes instead. This, in turn, facilitates the attainment of ultra-high speeds with enhanced efficiency. The square-wave control mode also extends the machine speed range while fully utilizing the DC-link voltage. The control system is implemented on full-bridge inverters based on wide bandgap (WBG) semiconductor devices operating at high switching frequencies. This is done to minimize current ripple due to the ultra-low inductance of this type of machines. The machine performance was simulated using finite element analysis (FEA) and MATLAB/Simulink, and it was also experimentally tested on a prototype two-phase PCB stator coreless AFPM machine connected to two single-phase full-bridge inverters.

Original languageEnglish
Title of host publication2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023
Pages4783-4788
Number of pages6
ISBN (Electronic)9798350316445
DOIs
StatePublished - 2023
Event2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023 - Nashville, United States
Duration: Oct 29 2023Nov 2 2023

Publication series

Name2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

Conference

Conference2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023
Country/TerritoryUnited States
CityNashville
Period10/29/2311/2/23

Bibliographical note

Publisher Copyright:
© 2023 IEEE.

Keywords

  • Axial-flux
  • FEA
  • PCB stator
  • coreless machines
  • drive-systems
  • field oriented control
  • permanent-magnet machines
  • sensorless control
  • square-wave control
  • wide bandgap semiconductors

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering

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