NDLI: Reduction of torque and radial force fluctuation in permanent magnet synchronous motors by means of multi-objective optimization

Content Provider	IEEE Xplore Digital Library
Author	Krotsch, J. Ley, T. Piepenbreier, B.
Copyright Year	2011
Description	Author affiliation: ebm-papst Mulfingen GmbH & Co. KG, 74673, Germany (Krotsch, J.; Ley, T.) \|\| Electrical Drives and Machines, University of Erlangen-Nuremberg, 91058, Germany (Piepenbreier, B.)
Abstract	This work relates to external rotor type permanent magnet synchronous machines having surface mounted permanent magnets and two-layer non-overlapping windings. A short review of approaches to reduce fluctuation of forces presented in literature is given. As the reduction is associated in most cases with a negative influence on other important design goals, multi-objective optimizations are applied in conjunction with the finite element analysis yielding PARETO-optimal solutions with different preferences. PARETO-optimal solutions regarding the permanent magnet magnetization distribution and the current profiles minimizing the torque fluctuation of a 12-slot 8-pole machine and the higher frequency radial force harmonics in a 12-slot 10-pole machine are presented and discussed. A discrete PARETO-optimal magnetization distribution has been identified which promises a higher fundamental PM flux linkage amplitude compared to radial magnetization, but at a significantly lower cogging torque and torque ripple utilizing the balancing of open circuit voltage harmonics. Furthermore, it is shown that individual current harmonics affect individual radial force harmonics dominantly. A test setup is proposed and the numerically obtained instantaneous torque and the influence of current harmonics on the radial force amplitudes are verified with good agreement.
Starting Page	40
Ending Page	48
File Size	2628557
Page Count	9
File Format	PDF
ISBN	9781457713712
e-ISBN	9781457713705
DOI	10.1109/EDPC.2011.6085546
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-28
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic flux Torque Acoustic noise Force Production Electromagnetic forces Vibration measurement Variable speed drives Pareto optimization Permanent magnet motors Inverters Magnetic analysis
Content Type	Text
Resource Type	Article

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