Semianalytical calculation of the torque in a linear permanent magnet motor with finite yoke length

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In this paper, a semianalytical model for the calculation of the torque produced by an iron-cored linear permanent-magnet motor is presented. The torque is calculated by means of the Maxwell stress tensor, which requires a description of the magnetic flux density distribution. The two-dimensional distribution is obtained from a semianalytical harmonic model, which accounts for the slotting and finite length of the iron yoke. An analytical expression for the thrust and normal force is obtained by evaluating the Maxwell stress tensor over a line through the air gap. For the torque calculation, the Maxwell stress tensor is numerically integrated along a contour that closely follows the structure of the yoke. The resulting torque and forces show good agreement with finite-element (FE) results.
Original languageEnglish
Title of host publicationProceedings of the IEEE International Magnetics Conference (INTERMAG 2012), 7-11 May 2012, Vancouver, Canada
PublisherInstitute of Electrical and Electronics Engineers
Publication statusPublished - 2012
Event2012 IEEE International Magnetics Conference (INTERMAG 2012) - Vancouver, Canada
Duration: 7 May 201211 May 2012

Publication series

NameIEEE Transactions on Magnetics
ISSN (Print)0018-9464


Conference2012 IEEE International Magnetics Conference (INTERMAG 2012)
Abbreviated titleINTERMAG 2012
Internet address


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