Analysis of Axial Leakage in High-Speed Slotless PM Motors for Industrial Hand Tools
2009 (English)In: IEEE transactions on industry applications, ISSN 0093-9994, E-ISSN 1939-9367, Vol. 45, no 5, 1815-1820 p.Article in journal (Refereed) Published
This paper presents an analysis of axial-leakage effects in high-speed slotless permanent-magnet (PM) motors for industrial hand-tool applications. Analytical predictions based on a 2-D model and results from a 3-D finite-element (3DFEM) simulation model are compared with experimental results from three series-produced PM motors. The reduction in flux density (resulting from 3DFEM simulations and measurements) 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, is not only 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
2009. Vol. 45, no 5, 1815-1820 p.
AC motor drives, high-speed motors, machine tools, machine windings, permanent-magnet (PM) motors, slotless windings
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-30669DOI: 10.1109/TIA.2009.2027109ISI: 000270036500030ScopusID: 2-s2.0-70349952410OAI: oai:DiVA.org:kth-30669DiVA: diva2:403108
QC 20110311 43rd Annual Meeting of the IEEE-Industry-Applications-Society, Edmonton, CANADA, OCT 05-09, 20082011-03-112011-03-042012-01-19Bibliographically approved