Open AccessTorque ripple suppression of permanent magnet synchronous machines by minimal harmonic current injection
Author(s) -
Yan Luocheng,
Liao Yong,
Lin Hao,
Sun Jun
Publication year - 2019
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2018.5647
Subject(s) - torque ripple , control theory (sociology) , harmonics , torque , ripple , magnet , stall torque , harmonic , harmonic analysis , computer science , physics , direct torque control , engineering , electronic engineering , electrical engineering , acoustics , voltage , induction motor , control (management) , artificial intelligence , thermodynamics
Reducing torque ripples in a permanent magnet (PM) synchronous machine (PMSM) system has been an essential requirement in some high‐performance applications. To suppress the torque ripples caused by time harmonics and spatial harmonics, an approach based on injecting minimum harmonic currents is proposed here. The proposed method extracts torque ripples from speed fluctuations, and the gradient descent optimisation (GDO) is utilised to determine the injected harmonic currents which are the commands of the harmonic current regulators. Using the torque ripple minimisation and the injected harmonic current minimisation as the two objectives, the GDO not only minimises the torque ripples of the PMSM system but also guarantees that the magnitude of the injected harmonic currents is minimal. The proposed method is simple to implement in the hardware and does not require complex computation. Its effectiveness is verified by experimental results.