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Permanent-Magnet Minimization in PM-Assisted Synchronous Reluctance Motors for Wide Speed Range

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5 Author(s)
Guglielmi, P. ; Dept. Energy, Politec. di Torino, Turin, Italy ; Boazzo, B. ; Armando, E. ; Pellegrino, G.
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This paper presents a technique to modify the rotor lamination of a permanent-magnet-assisted synchronous reluctance motor, in order to reduce the magnet volume with no side effect on performance. A closed-form analysis, which is based on a lumped parameter model, points out that the magnet quantity can be minimized with a significant saving of material volume and cost. At a second stage, the risk of demagnetization is evaluated since the minimized magnets are thinner than the starting ones and work on lower load lines in their respective B-H planes. A feasible drawing is analytically defined, which is robust against demagnetization at overload, showing that the saving of magnet quantity depends on the maximum current overload and can be significant. The theoretical formulation is validated with finite-element analysis and experiments on a prototype machine.

Published in:

Industry Applications, IEEE Transactions on  (Volume:49 ,  Issue: 1 )

Date of Publication:

Jan.-Feb. 2013

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