Permanent-Magnet Flux-Switching Integrated Starter Generator With Different Rotor Configurations for Cogging Torque and Torque Ripple Mitigations
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In this paper, the effects of the rotor pole arc width on the cogging torque, torque ripple, and output torque are first established using finite-element analysis (FEA), and three torque ripple reduction techniques based on the optimization of three different rotor pole configurations, namely, uniform, step skewed, and axial pairing, are then proposed.Abstract:
This paper investigates the cogging torque and torque ripple features of a permanent-magnet flux-switching integrated starter generator. The effects of the rotor pole arc width on the cogging torque, torque ripple, and output torque are first established using finite-element analysis (FEA). Three torque ripple reduction techniques based on the optimization of three different rotor pole configurations, namely, uniform, step skewed, and axial pairing, are then proposed. The torque characteristics of each rotor configuration at varying load currents and phase angles are studied in detail. A prototype machine with a common stator and the three optimized rotor configurations are built for experimental validation. Both the FEA results and the experimental tests show that the step skewed and axial pairing techniques can alleviate the cogging torque significantly, but the latter is less effective than the former in reducing the overall torque ripple.read more
Citations
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A Novel Permanent-Magnet Flux Switching Machine With an Outer-Rotor Configuration for In-Wheel Light Traction Applications
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Co-Reduction of Torque Ripple for Outer Rotor Flux-Switching PM Motor Using Systematic Multi-Level Design and Control Schemes
TL;DR: A new systematic multi-level design and control scheme is proposed to coreduce the torque ripple of the proposed FSPM motor incorporating the concept of stator permanent-magnet motor into outer-rotor motor, and the optimization model based on the iterative learning control method is proposed.
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Comparison of Cogging Torque Reduction in Permanent Magnet Brushless Machines by Conventional and Herringbone Skewing Techniques
Weizhong Fei,Zi-Qiang Zhu +1 more
TL;DR: The results have revealed that both the conventional and herringbone rotor step skewing techniques can reduce the cogging torque significantly, but the latter is less effective than the former especially with small skewing step numbers.
References
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Proceedings ArticleDOI
Design techniques for reducing the cogging torque in surface-mounted PM motors
TL;DR: In this article, a simple original model of the cogging torque mechanism and a Fourier analysis are introduced, and the effects of cog torque elimination on back electromotive force are discussed.
Journal ArticleDOI
Analysis of electromagnetic performance of flux-switching permanent-magnet Machines by nonlinear adaptive lumped parameter magnetic circuit model
TL;DR: In this paper, a nonlinear adaptive lumped parameter magnetic circuit model is developed to predict the electromagnetic performance of a flux-switching permanent-magnet machine, which enables the air-gap field distribution, the back-electromotive force (back-EMF) waveform, the winding inductances, and the electromagnetic torque to be calculated.
Journal ArticleDOI
Advanced Flux-Switching Permanent Magnet Brushless Machines
Zi-Qiang Zhu,J.T. Chen +1 more
TL;DR: In this article, the recent development and new topologies of flux-switching machines, with particularly emphasis on the permanent magnet (PM) type, have been discussed, including winding configurations, combinations of stator and rotor pole numbers, rotor pole width, split ratio, etc.
Journal ArticleDOI
Permanent Magnet Synchronous Motor Magnet Designs with Skewing for Torque Ripple and Cogging Torque Reduction
TL;DR: In this article, the effect of slot/pole combinations and magnet shapes on the magnitude and harmonic content of torque waveforms in a permanent magnet synchronous motors with skewed rotor has been studied, and experimental results show that for certain magnet designs and configurations the skewing with steps does not necessarily reduce the ripple in the electromagnetic torque, but may cause it to increase.
Journal ArticleDOI
Analysis and Optimization of Back EMF Waveform of a Flux-Switching Permanent Magnet Motor
TL;DR: In this paper, the authors investigated the effect of the rotor pole-arc on the phase back EMF waveform of a typical three-phase FSPM motor with 12 stator teeth and ten rotor poles and found that there is a significant difference in the magnetic flux paths associated with the coils of each phase.