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  4. Hybrid FEM-analytical force and torque models of a reaction sphere actuator
 
conference paper

Hybrid FEM-analytical force and torque models of a reaction sphere actuator

Rossini, L.
•
Onillon, E.
•
Chetelat, O.
Show more
2013
Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013
2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013

This paper presents a hybrid FEM-analytical model for the magnetic flux density, the force and torque of a Reaction Sphere (RS) actuator for satellite attitude control. The RS is a permanent magnet synchronous spherical actuator whose rotor is magnetically levitated and can be accelerated about any desired axis. The spherical actuator is composed of an 8-pole permanent magnet spherical rotor and of a 20-coil stator. Due to the highly complex geometry of the spherical rotor, consisting of 8 bulk permanent magnet poles with truncated spherical shape adjusted on the back-iron structure with truncated octahedral shape, a pure analytical approach is not possible. Therefore, in this article we adopt a hybrid approach in which FEM or measured derived values are combined with other boundary conditions on a known analytical structure to derive expressions for the magnetic flux density, the force, and the torque. The Laplace equation is solved by exploiting powerful properties of spherical harmonic functions under rotation to derive closed-form linear expressions for all possible orientations of the rotor. The proposed models are experimentally validated using a developed laboratory prototype and with finite element simulations. © 2013 IEEE.

  • Details
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Type
conference paper
DOI
10.1109/IEMDC.2013.6556169
Author(s)
Rossini, L.
Onillon, E.
Chetelat, O.
Perriard, Y.  
Date Issued

2013

Publisher

IEEE Computer Society

Publisher place

Washington, DC 20036-4928, United States

Published in
Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013
Start page

694

End page

700

Subjects

Actuators

•

Attitude control

•

Electric machinery

•

Harmonic functions

•

Magnetic flux

•

Magnetic levitation

•

Magnetic levitation vehicles

•

Permanent magnets

•

Poles

•

Spheres

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LAI  
Event nameEvent placeEvent date
2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013

Chicago, IL, United States

May 12 - 15, 2013

Available on Infoscience
November 20, 2013
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/97137
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