Mild hybridisation of turboprop engine with high-power-density integrated electric drives

Yuzheng Chen, Tao Yang, Muhammad Khowja, Antonino La Rocca, Usman Nasir, Shajjad Chowdhury, Dean Evans, Dafydd Kember, Thomas Klonowski, Yohan Arnaud, Lucie Apostin, Thierry Liger, Gregory Cossart, Gaurang Vakil, Chris Gerada, Serhiy Bozhko, Sebastien Detry, Christophe Diette, Patrick Wheeler

Research output: Journal PublicationArticlepeer-review


This paper shares with the aerospace community a case study of turboprop mild hybridisation using a recently developed integrated drive system in the University of Nottingham, UK, within the ACHIEVE project under EU H2020 CleanSky 2 program (project No. 737814). The developed drive system enables green taxiing of a turboprop aircraft while on the ground with its engine off, and as an electrical generator when the turboprop is in the air. The entire system is designed to be able to integrate within the power auxiliary gear box (PAGB) of a turboprop aircraft. Some of the key features of the developed system include a high-speed permanent magnet machine (up to 14,200rpm) with dual three-phase design, SiC-based high power density (11.8kW/L for the power converter, 35.3kW/L and 7.2kW/kg for the machine active parts), integrated cooling design for high-temperature operation (>130°C ambient temperature), fault tolerance consideration with dual channel operation capabilities and sensorless control for entire operational conditions. This paper is giving an overview of the design process of the electrical machine, power converters, and its cooling of the entire drive. Numerical analysis (FEM and CFD) and some experimental results are presented to demonstrate the effectiveness and the desired performance of the developed integrated drive system.

Original languageEnglish
JournalIEEE Transactions on Transportation Electrification
Publication statusAccepted/In press - 2022
Externally publishedYes


  • Aerospace electronics
  • Aircraft
  • Genetic algorithms
  • Optimization
  • Power generation
  • SiC power conversion
  • Torque
  • Torque measurement
  • dual three-phase machine
  • mild-hybridisation
  • permanent magnet machine
  • sensorless control
  • turboprop aircraft

ASJC Scopus subject areas

  • Automotive Engineering
  • Transportation
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


Dive into the research topics of 'Mild hybridisation of turboprop engine with high-power-density integrated electric drives'. Together they form a unique fingerprint.

Cite this