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Cogging-force-reduction techniques for linear permanent-magnet machines

Cogging-force-reduction techniques for linear permanent-magnet machines

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The paper describes two techniques for reducing the cogging force associated with the finite length of the ferromagnetic armature core of a tubular permanent-magnet machine. Analytical expressions for predicting the cogging force which is associated with armature cores having skewed or stepped end faces are established, and a cogging-force-minimisation technique is employed to determine an optimal armature-core length. The validity of the analytical cogging-force predictions and the effectiveness of the cogging-force-reduction techniques are verified by three-dimensional finite-element analyses and experimental measurements.

Inspec keywords: linear machines; magnetic forces; ferromagnetic materials; minimisation; magnetic cores; permanent magnet machines; finite element analysis

Other keywords: ferromagnetic armature core finite length; skewed end faces; three-dimensional finite-element analyses; cogging-force-reduction technique; linear permanent-magnet machines; optimal armature-core length; tubular permanent-magnet machine; stepped end faces

Subjects: Linear machines; d.c. machines; Optimisation techniques; a.c. machines; Finite element analysis

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