Professor Guang-Jin Li
PhD, MSc, BEng
Department of Electronic and Electrical Engineering
Professor in Electrical Machines
Electrical Machines and Drives Research Group


+44 114 222 5132
Full contact details
Department of Electronic and Electrical Engineering
Sir Frederick Mappin Building
Mappin Street
Sheffield
S1 3JD
- Profile
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I graduated from Wuhan University (China) with a Bachelor’s degree in Electrical Engineering and Automation in July 2007.
Then I received my Master degree in Electric Power Systems from the Université de Paris XI, Supélec and École Normale Supérieure de Cachan (ENS Cachan), France, in July 2008.
I was subsequently awarded a PhD degree from ENS Cachan, France, in July 2011. After almost a further year working as a post-doctoral researcher in SATIE laboratory, ENS Cachan, France, I joined the EMD group at the University of Sheffield as a research associate, in June 2012.
I was appointed as a Lecturer in Electrical Machines and Drives in September 2013, and promoted to Senior Lecturer in January 2018 and Professor in January 2022, all at The University of Sheffield.
My main research interests focus on the design aspect of electrical machines. I am particularly interested in renewable energy and EV/HEV applications.
I work closely with Siemens-Gamesa designing novel permanent magnet machines and high temperature superconducting machines for offshore wind power direct drive (DD) generators.
I also explore thermal management and fault diagnostics of various PM machines such as the switched flux and also hybrid excited switched flux PM machines.
These are important areas of research for safety-critical applications such as more electrical aircraft. The fault I am particularly interested is the inter-turn short-circuit, which could cause local overheating and also magnet irreversible demagnetization.
I am also interested in developing magnet free machines, e.g. synchronous reluctance and switched reluctance machines, for applications such as EV/HEV and low cost domestic appliances.
These machines can be supplied with both square wave and sinewave currents. The latter can lead to reduced converter cost.
Moreover, their torque/power density can be significantly increased while the torque ripple can be reduced, so do the vibrations and acoustic noise levels.
- Qualifications
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- PhD, ENS de Cachan 2011
- MSc, University of Paris Sud 2008
- BEng, Wuhan University 2007
- Research interests
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- Novel permanent magnet machines including single and hybrid excited switched flux permanent magnet machines
- Design of novel switched reluctance machines and their drives including direct torque control and hybrid current control
- Fault tolerance, fault modelling and diagnostics (inter-turn and phase short-circuit) of permanent magnet machines
- Thermal management (forced air cooling, liquid cooling and ferrofluid cooling) of electrical machines
- Renewable energy and low emission transportation including wind power, electrical/hybrid vehicles, more electrical aircraft
- Publications
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Journal articles
- Scaling effect on inter-turn short-circuit fault of PM machines for wind power application. IEEE Transactions on Industry Applications.
- View this article in WRRO
- Analytical modelling of dynamic performance with harmonic current injection for doubly salient SynRMs. IEEE Transactions on Industry Applications. View this article in WRRO
- Scaling effect on electromagnetic performance of surface mounted permanent magnet Vernier machine. IEEE Transactions on Magnetics. View this article in WRRO
- Equivalent Magnetic Circuit Analysis of Doubly Salient PM Machine with π-Shaped Stator Iron Core Segments. IEEE Transactions on Applied Superconductivity, 1-1.
- Consequent Pole Permanent Magnet Vernier Machine With Asymmetric Air-Gap Field Distribution. IEEE Access, 7, 109340-109348.
- Comparative investigation of stator-mounted permanent magnet machines under fault conditions. The Journal of Engineering, 2019(17), 4241-4246. View this article in WRRO
- Investigation on Contribution of Inductance Harmonics to Torque Production in Multiphase Doubly Salient Synchronous Reluctance Machines. IEEE Transactions on Magnetics, 55(4). View this article in WRRO
- Performance of superconducting generators with different topologies under fault conditions. The Journal of Engineering, 2019(17), 4090-4095. View this article in WRRO
- Performance comparison between consequent-pole and inset modular permanent magnet machines. The Journal of Engineering, 2019(17), 3951-3955. View this article in WRRO
- Combined Multi-Physics Model of Switched Flux PM Machines under Fault Operations. IEEE Transactions on Industrial Electronics. View this article in WRRO
- Comparative Studies of Torque Performance Improvement for Different Doubly Salient Synchronous Reluctance Machines by Current Harmonic Injection. IEEE Transactions on Energy Conversion. View this article in WRRO
- Quantitative Analysis of Contribution of Air-Gap Field Harmonics to Torque Production in Three-Phase 12-Slot/8-Pole Doubly Salient Synchronous Reluctance Machines. IEEE Transactions on Magnetics, 54(9). View this article in WRRO
- Influence of stator topologies on average torque and torque ripple of fractional-slot SPM machines with fully closed slots. IEEE Transactions on Industry Applications, 54(3), 2151-2164. View this article in WRRO
- Recent development of reluctance machines with different winding configurations, excitation methods, and machine structures. China Electrotechnical Society Transactions on Electrical Machines and Systems, 2(1), 82-92. View this article in WRRO
- Novel Modular Switched Reluctance Machines for Performance Improvement. IEEE Transactions on Energy Conversion, 33(3), 1255-1265. View this article in WRRO
- Demagnetization Withstand Capability Enhancement of Surface Mounted PM Machines Using Stator Modularity. IEEE Transactions on Industry Applications. View this article in WRRO
- Design considerations for high-power converters interfacing 10 MW superconducting wind power generators. Iet Power Electronics, 10(12), 1461-1467. View this article in WRRO
- Influence of Pole Number and Stator Outer Diameter on Volume, Weight and Cost of Superconducting Generators with Iron-Cored Rotor Topology for Wind Turbines. IEEE Transactions on Applied Superconductivity. View this article in WRRO
- Investigation on Synchronous Reluctance Machines with Different Rotor Topologies and Winding Configurations. IET Electric Power Applications. View this article in WRRO
- Comparison of 10MW superconducting generators with different topologies for offshore direct-drive wind turbines. IEEE Transactions on Applied Superconductivity. View this article in WRRO
- Design guidelines for fractional slot multi-phase modular permanent magnet machines. IET Electric Power Applications, 11(6), 1023-1031. View this article in WRRO
- Investigation of irreversible demagnetisation in switched flux permanent magnet machines under short-circuit conditions. IET Electric Power Applications. View this article in WRRO
- Comparative Study of Fault Tolerant Switched Flux Permanent Magnet Machines. IEEE Transactions on Industrial Electronics. View this article in WRRO
- Comparison of peak armature and peak field winding currents for different topologies of 10 MW superconducting generators under short-circuit conditions. IEEE Transactions on Applied Superconductivity. View this article in WRRO
- Influence of Conduction Angles on Single-Layer Switched Reluctance Machines. IEEE Transactions on Magnetics, 52(12). View this article in WRRO
- Comparative Study of Torque Production in Conventional and Mutually Coupled SRMs Using Frozen Permeability. IEEE Transactions on Magnetics, 52(6). View this article in WRRO
- Performance Comparison of Doubly Salient Reluctance Machine Topologies Supplied by Sinewave Currents. IEEE Transactions on Industrial Electronics, 63(7), 4086-4096. View this article in WRRO
- Superposition Method for Cogging Torque Prediction in Permanent Magnet Machines With Rotor Eccentricity. IEEE Transactions on Magnetics, 52(6).
- Cogging Torque Mitigation of Modular Permanent Magnet Machines. IEEE Transactions on Magnetics, 52(1), 1-10. View this article in WRRO
- Performance investigation of hybrid excited switched flux permanent magnet machines using frozen permeability method. IET Electric Power Applications, 9(9), 586-594. View this article in WRRO
- Analytical Synthesis of Air-Gap Field Distribution in Permanent Magnet Machines With Rotor Eccentricity by Superposition Method. IEEE Transactions on Magnetics, 51(11), 1-4.
- Analytical Modeling of Modular and Unequal Tooth Width Surface-Mounted Permanent Magnet Machines. IEEE Transactions on Magnetics, 51(9), 1-9. View this article in WRRO
- Modular Permanent-Magnet Machines With Alternate Teeth Having Tooth Tips. IEEE Transactions on Industrial Electronics, 62(10), 6120-6130. View this article in WRRO
- Excitation Winding Short-Circuits in Hybrid Excitation Permanent Magnet Motor. IEEE Transaction on Energy Conversion, 29(3).
- Influence of Flux Gaps on Electromagnetic Performance of Novel Modular PM Machines. IEEE Transaction on Energy Conversion, 29(3), 716-726.
- Comparative Studies of Modular and Unequal Tooth PM Machines either with or without Tooth Tips. IEEE Transaction on Magnetics, 50(7).
- Comparative study of classical and mutually coupled switched reluctance motors using multiphysics finite-element modeling. IEEE Transactions on Industrial Electronics, 61(9), 5066-5074.
- Design of a flux-switching electrical generator for wind turbine systems. IEEE Transactions on Industry Applications, 48, 1808-1816-1808-1816.
- Modification in rotor pole geometry of mutually coupled switched reluctance machine for torque ripple mitigating. IEEE Transactions on Magnetics, 48, 2025-2034-2025-2034.
- Thermal-electromagnetic analysis for driving cycles of embedded flux-switching permanent-magnet motors. IEEE Transactions on Vehicular Technology, 61, 140-151-140-151.
- Thermal-electromagnetic analysis of a fault-tolerant dual-star flux-switching permanent magnet motor for critical applications. IET Electric Power Applications, 5, 503-513-503-513.
- Comparative studies between classical and mutually coupled switched reluctance motors using thermal-electromagnetic analysis for driving cycles. IEEE Transactions on Magnetics, 47(4), 839-847.
- Coupled Electromagnetic–Thermal Modelling of Dynamic Performance for Modular SPM Machines. Energies, 16(6), 2516-2516.
Conference proceedings papers
- Performance Comparison of Optimized Stator-Mounted Permanent Magnet Machines Focusing on PM Usage. 2022 IEEE Energy Conversion Congress and Exposition (ECCE), 9 October 2022 - 13 October 2022.
- Scaling Effect on Inter-Turn Short-Circuit of PM Machines for Wind Power Application. 2021 IEEE International Electric Machines & Drives Conference (IEMDC), 17 May 2021 - 20 May 2021.
- Novel Liquid Cooling Technology for Modular Consequent-Pole PM Machines. 2021 IEEE International Electric Machines & Drives Conference (IEMDC), 17 May 2021 - 20 May 2021.
- Optimization of Modular SPM Machines Considering Stator Modularity. 2021 IEEE International Electric Machines & Drives Conference (IEMDC), 17 May 2021 - 20 May 2021.
- Influence of Demagnetization on Selecting the Optimum Slot/Pole Number Combination for 3MW Surface Mounted Permanent Magnet Vernier Machine. 2019 22nd International Conference on Electrical Machines and Systems (ICEMS), 11 August 2019 - 14 August 2019.
- Losses in Different Doubly Salient Synchronous Reluctance Machines with Current Harmonic Injection. 2019 22nd International Conference on Electrical Machines and Systems (ICEMS), 11 August 2019 - 14 August 2019.
- Dynamic Performance Investigation of Doubly Salient Synchronous Reluctance Machines with Current Harmonic Injection. 2019 22nd International Conference on Electrical Machines and Systems (ICEMS), 11 August 2019 - 14 August 2019.
- Torque Performance Improvement of Doubly Salient Synchronous Reluctance Machines by Current Harmonic Injection. 2019 IEEE International Electric Machines & Drives Conference (IEMDC), 12 May 2019 - 15 May 2019.
- Comparative Studies of Fractional/Integer-Slot Consequent Pole Permanent Magnet Machines. 2019 IEEE International Electric Machines & Drives Conference (IEMDC), 12 May 2019 - 15 May 2019.
- Investigation of Integer/Fractional Slot Consequent Pole PM Machines with Different Rotor Structures. 2019 IEEE International Electric Machines & Drives Conference (IEMDC), 12 May 2019 - 15 May 2019.
- Study of Manufacturing Tolerance of Modular Permanent Magnet Machines: Segment Radial Displacement. 2019 IEEE International Electric Machines & Drives Conference (IEMDC), 12 May 2019 - 15 May 2019.
- Modeling of Inter-Turn and Inter-Phase Short-Circuit of Flux-Switching Permanent Magnet Motors. 2018 IEEE Energy Conversion Congress and Exposition (ECCE), 23 September 2018 - 27 September 2018. View this article in WRRO
- Influence of slot opening and flux gaps on the voltage distortion in spm machines. Proceedings: 2016 XXII International Conference on Electrical Machines (ICEM), 4 September 2016 - 7 September 2016.
- Cogging torque and torque ripple reduction of modular permanent magnet machines. 2016 XXII International Conference on Electrical Machines (ICEM), 4 September 2016 - 7 September 2016.
- Demagnetization analysis of modular surface mounted permanent magnet machines. Proceedings: 2016 XXII International Conference on Electrical Machines (ICEM), 4 September 2016 - 9 September 2016.
- Comparative study of voltage distortion in fractional-slot PM machines having different winding and stator configurations. 2016 Eleventh International Conference on Ecological Vehicles and Renewable Energies (EVER), 6 April 2016 - 8 April 2016.
- Torque investigation of fractional-slot permanent magnet machines with different winding topology and stator structures. 2016 Eleventh International Conference on Ecological Vehicles and Renewable Energies (EVER), 6 April 2016 - 8 April 2016.
- Hybrid Excitation Switched Flux Permanent Magnet Machines with Hybrid Magnets. 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)
- Comparative study of alternative modular switched flux permanent magnet machines. 2015 IEEE International Conference on Industrial Technology (ICIT), 17 March 2015 - 19 March 2015.
- Comparative study of short-pitched and fully-pitched SRMs supplied by sine wave currents. 2015 IEEE International Conference on Industrial Technology (ICIT), 17 March 2015 - 19 March 2015.
- Analytical synthesis of air-gap field in permanent magnet machines with rotor eccentricity by superposition method. 2015 IEEE Magnetics Conference (INTERMAG), 11 May 2015 - 15 May 2015.
- Electromagnetic loss investigation and mitigation in switched flux permanent magnet machines. 2014 International Conference on Electrical Machines (ICEM), 2 September 2014 - 5 September 2014.
- Thermal modelling of switched flux permanent magnet machines. 2014 International Conference on Electrical Machines (ICEM), 2 September 2014 - 5 September 2014.
- Grants
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September 2020 - August 2022
- Sponsor: EPSRC
- Title: Advanced Thermomagnetic Cooling for Ultrahigh Power Density Electrical Machines
- PI
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January 2019 - December 2023
- Sponsor: Offshore Renewable Catapult
- Title: Powertrain Research Hub
- Co-I
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April 2019 - September 2027
- Sponsor: EPSRC
- Title: EPSRC Centre for Doctoral Training in Offshore Wind Energy and the Environment (AURA CDT)
- EEE lead
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July 2017 - June 2019
- Sponsor: Innovate UK
- Title: Inverter integrated machine for low carbon vehicles
- Co-I
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July 2017 - June 2019
- Sponsor: Innovate UK
- Title: Development of novel power tool motors - KTP
- PI
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Oct 2017 - Sept 2022
- Sponsor: EPSRC
- Title: Siemens Wind Power: Prosperity Partnerships
- Co-I
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Oct 2014 - Oct 2016
- Sponsor: Innovate UK
- Title: KTP - Cobham CTS Ltd
- Co-I
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Dec 2015 - Feb 2016
- Sponsor: Siemens-Gamesa
- Title: Investigation of HTS generator for 10-20 MW wind turns and PhD funding
- Co-I
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Sep 2016 - Aug 2017
- Sponsor: CSR ZHUZHOU INSTITUTE CO LTD
- Title: CRRC Research Centre (Phase III)
- Co-I
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- Teaching activities
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- Module Leader of EEE 305 "Machine Design"
- Module Leader of EEE6204 "Permanent Magnet Machines and Actuators"
- Professional activities and memberships
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- AMPERE MSc Administrator
- Departmental Exam Officer
- Research students
Student Degree Status Primary/Secondary Ma X PhD Graduated Primary Ren B PhD Graduated Primary Taras P PhD Graduated Primary Zhang K PhD Graduated Primary Zhou R PhD Graduated Primary Kana Padinharu D PhD Graduated Primary