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Decoupling Manufacturing Sources of Cogging Torque in Fractional Pitch PMSM

Thiele, Mark, Heins, Greg and Brown, Travis (2011). Decoupling Manufacturing Sources of Cogging Torque in Fractional Pitch PMSM. In: IEMDC11:2011 IEEE International Electric Machines and Drives Conference (IEMDC), Niagara Falls, ON, Canada, 15-18 May 2011I.

Document type: Conference Paper

IRMA ID CDU0002xPUB30
Author Thiele, Mark
Heins, Greg
Brown, Travis
Title Decoupling Manufacturing Sources of Cogging Torque in Fractional Pitch PMSM
Conference Name IEMDC11:2011 IEEE International Electric Machines and Drives Conference (IEMDC)
Conference Location Niagara Falls, ON, Canada
Conference Dates 15-18 May 2011I
Conference Publication Title 2011 IEEE International Electric Machines and Drives Conference (IEMDC)
Place of Publication United States of America
Publisher Institute of Electrical and Electronics Engineers (IEEE)
Publication Year 2011
ISBN 978-1-4577-0060-6   (check CDU catalogue  open catalogue search in new window)
Start Page 924
End Page 929
Total Pages 6
HERDC Category E1 - Conference Publication (DIISR)
Abstract Fractional pitch is commonly used to significantly reduce cogging torque in PMSM, however, maximum benefit is dependent on accurate stator and rotor manufacturing. This paper presents a method of decoupling the stator and rotor contributions to total cogging torque. Rotor causes are further decoupled into magnet placement and strength variation. Decoupling is possible due to stator and rotor affected harmonics being independent of one another. Magnet strength and position decoupling is based on the analysis of the cogging torque waveform generated by the rotor interaction with a single slot stator and utilizes the zero torque produced when a single magnet is directly over a slot. Superposition and least squares minimization is then used to determine strength variation and simulate cogging torque with and without placement and strength variation. Analysis of ten production stators and rotors is presented and discussed, with the overall findings confirming that for the motors tested, the largest contributors to manufacturing induced cogging torque were the stator, magnet placement inaccuracy and magnet strength variation. Eliminating stator variation would improve cogging torque by 45%, perfect magnet placement would result in a 29% reduction in cogging torque and eliminating magnet strength variations would achieve a 7% reduction.
Additional Notes 10.1109/IEMDC.2011.5994939
Description for Link Link to conference paper
URL http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5994939
 
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