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Sensors 2014, 14(7), 13070-13087; doi:10.3390/s140713070
Article

Influence of Segmentation of Ring-Shaped NdFeB Magnets with Parallel Magnetization on Cylindrical Actuators

1,* , 2
 and 1
1 Post-Graduate Program in Electrical Engineering, Federal University of Rio Grande do Sul, Av. Osvaldo Aranha 103, CEP: 90035-190, Porto Alegre, RS, Brazil 2 Technology Center, Federal University of Santa Maria, Av. Roraima 1000, CEP: 97105-900, Santa Maria, RS, Brazil
* Author to whom correspondence should be addressed.
Received: 4 May 2014 / Revised: 11 July 2014 / Accepted: 11 July 2014 / Published: 21 July 2014
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Abstract

This work analyses the effects of segmentation followed by parallel magnetization of ring-shaped NdFeB permanent magnets used in slotless cylindrical linear actuators. The main purpose of the work is to evaluate the effects of that segmentation on the performance of the actuator and to present a general overview of the influence of parallel magnetization by varying the number of segments and comparing the results with ideal radially magnetized rings. The analysis is first performed by modelling mathematically the radial and circumferential components of magnetization for both radial and parallel magnetizations, followed by an analysis carried out by means of the 3D finite element method. Results obtained from the models are validated by measuring radial and tangential components of magnetic flux distribution in the air gap on a prototype which employs magnet rings with eight segments each with parallel magnetization. The axial force produced by the actuator was also measured and compared with the results obtained from numerical models. Although this analysis focused on a specific topology of cylindrical actuator, the observed effects on the topology could be extended to others in which surface-mounted permanent magnets are employed, including rotating electrical machines.
Keywords: permanent magnets; magnetization pattern; parallel magnetization; radial magnetization; NdFeB magnets; linear cylindrical electric machine; segmented ring-shaped magnets permanent magnets; magnetization pattern; parallel magnetization; radial magnetization; NdFeB magnets; linear cylindrical electric machine; segmented ring-shaped magnets
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Eckert, P.R.; Goltz, E.C.; Filho, A.F.F. Influence of Segmentation of Ring-Shaped NdFeB Magnets with Parallel Magnetization on Cylindrical Actuators. Sensors 2014, 14, 13070-13087.

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