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Speed/Torque Ripple Reduction of High-speed Permanent Magnet Starters/Generators with Low Inductance for More Electric Aircraft Applications

Zhang, Xiang; Yang, Tao; Bozhko, Serhiy


Xiang Zhang

Associate Professor

Professor of Aircraft Electric Power Systems


With the electrification trend of future aircraft, high-speed Permanent Magnet Starters/Generators (PMS/Gs) will potentially be widely used in onboard generation systems due to their high power density and high efficiency. However, the per-unit reactance of such high-speed machines is normally designed to be very low due to limited onboard power supply voltage and large electrical power demand, which can result in large current ripples in the machine and thus large torque ripples especially when the machine is fed with a semiconductor-based inverter of a lower switching frequency. The torque ripples may further lead to speed oscillation and generate severe vibrations and noises that are harmful to the mechanical system and human beings around. In this paper, a speed/torque ripple reduction method for high-speed PMS/Gs with a low inductance is proposed to improve their performance within a wide speed range. An active damping technique is applied to the speed loop to increase the anti-disturbance capability and generate a smoother reference for the current loop, whereas an adaptive output voltage saturation limit is utilized for the current loop to limit the peak value of current to prevent over-current and torque spikes. The parameter tuning criteria is derived through a thorough analysis. Finally, the proposed method is validated on a high-speed PMS/G with an inductance of 99uH. The results show that the speed ripples and torque ripples are reduced by over 50% within a speed range of 2 krpm to 14 krpm.


Zhang, X., Yang, T., & Bozhko, S. (2022). Speed/Torque Ripple Reduction of High-speed Permanent Magnet Starters/Generators with Low Inductance for More Electric Aircraft Applications. IEEE Transactions on Transportation Electrification,

Journal Article Type Article
Acceptance Date Jul 24, 2022
Online Publication Date Jul 29, 2022
Publication Date Jul 29, 2022
Deposit Date Aug 8, 2022
Publicly Available Date Aug 8, 2022
Journal IEEE Transactions on Transportation Electrification
Electronic ISSN 2332-7782
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Keywords Electrical and Electronic Engineering, Energy Engineering and Power Technology, Transportation, Automotive Engineering
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