Analysis of Axial Leakage in High-Speed Slotless PM Motors for Industrial Hand Tools
2008 (English)In: 2008 IEEE INDUSTRY APPLICATIONS SOCIETY ANNUAL MEETING, 2008, 2070-2075 p.Conference paper (Refereed)
This paper presents an analysis of axial leakage effects in high-speed, slotless permanent magnet (PM) motors for industrial hand-tool applications. Analytical predictions and results from a finite-element simulation model are compared to experimental results from three, series-produced PM motors. The reduction in predicted and measured flux density outside the motor's axial ends is substantial; the flux density has practically vanished only a few millimeters outside the stator lamination stack. To predict the resulting flux linkage, a simple winding model is presented where the winding is made up of a discrete number of winding layers. Using this winding model, it is verified that the reduction in flux linkage, manifested as a reduction in the back electromotive force (EMF), is dependent on the motor's axial length but also that the effect is minor for slotless PM motors with dimensions suitable for hand-tool applications. The results are also supported by no-load line-to-line voltage measurements on the three PM motors.
Place, publisher, year, edition, pages
2008. 2070-2075 p.
, IEEE INDUSTRY APPLICATIONS SOCIETY ANNUAL MEETING, ISSN 0197-2618
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-31273DOI: 10.1109/08IAS.2008.59ISI: 000263417001077ScopusID: 2-s2.0-57949089237ISBN: 978-1-4244-2278-4OAI: oai:DiVA.org:kth-31273DiVA: diva2:405283
IEEE Industry-Applications-Society Annual Meeting, Alberta, CANADA, OCT 05-09, 2008
QC 201103222011-03-222011-03-112011-03-22Bibliographically approved