Design Optimization of a Direct-drive Wind Generator with Non-rare-earth PM Flux Intensifying Stator and Reluctance Rotor

Ali Mohammadi, Oluwaseun A. Badewa, Yaser Chulaee, Dan M. Ionel, Somasundaram Essakiappan, Madhav Manjrekar

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

1 Scopus citations

Abstract

This paper presents a multi-objective design optimization for a novel direct-drive wind turbine generator. The proposed electric machine topology employs an outer rotor of the reluctance type and a special modular stator including three phase-windings and spoke-type permanent magnets (PMs). Each stator module includes a single coil toroidally wound around the ferromagnetic core. Consecutive stator modules are separated by PMs and include coils belonging to a different phase. An optimization method with three objectives: total power loss, weight, and torque ripple, and with one constraint for a minimum acceptable value for the power factor, is described. The design examples are for a direct-drive generator rated at 3 MW and 15 rpm. The simulation results show that with the proposed topology, which greatly benefits from PM flux concentration and special coils, performance, such as specific thrust, efficiency, "goodness", etc, can be comparable to more traditional synchronous PM designs, but without the need to use rare earth-magnets that have high cost and critical supply. Furthermore, options for using aluminum instead of copper wire to further reduce the weight and cost of winding are investigated and comparative results are discussed.

Original languageEnglish
Title of host publication2023 IEEE International Electric Machines and Drives Conference, IEMDC 2023
ISBN (Electronic)9798350398991
DOIs
StatePublished - 2023
Event2023 IEEE International Electric Machines and Drives Conference, IEMDC 2023 - San Francisco, United States
Duration: May 15 2023May 18 2023

Publication series

Name2023 IEEE International Electric Machines and Drives Conference, IEMDC 2023

Conference

Conference2023 IEEE International Electric Machines and Drives Conference, IEMDC 2023
Country/TerritoryUnited States
CitySan Francisco
Period5/15/235/18/23

Bibliographical note

Publisher Copyright:
© 2023 IEEE.

Keywords

  • Direct-drive generator
  • FEA
  • electric machine
  • flux-intensifying topology
  • multi-objective optimization
  • reluctance rotor
  • wind turbine

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering

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