Efficient Utilization of Rare Earth Permanent-Magnet Materials and Torque Ripple Reduction in Interior Permanent-Magnet Machines

This paper proposes a new interior permanent-magnet machine (IPMM) design in which the rotor consists of several rotor segments arranged in the axial direction, aiming to improve the utilization of rare earth permanent-magnet (PM) materials and reduce the torque ripple. The proposed design is optimi...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2017-07, Vol.53 (4), p.3485-3495
Main Authors: Du, Zhentao S., Lipo, Thomas A.
Format: Article
Language:English
Subjects:
3-D machine design
Cavity resonators
Cogging torque
Design optimization
differential evolution
efficiency
Finite element method
finite-element (FE) modelings
interior permanent-magnet machines (IPMMs)
Iron
Motors
Optimization
Permanent magnets
Rare earth elements
ripple torque
Rotors
Segments
Stator windings
Torque
Weight reduction
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Summary:This paper proposes a new interior permanent-magnet machine (IPMM) design in which the rotor consists of several rotor segments arranged in the axial direction, aiming to improve the utilization of rare earth permanent-magnet (PM) materials and reduce the torque ripple. The proposed design is optimized to feature a 21% reduction of rare earth PM materials and a 50% reduction of ripple torque ratio compared with the Camry 2007 design, which uses the conventional pole-shaping technique to suppress its torque ripple. Although the torque is reduced by 9%, the torque per magnet weight is improved by 15%, indicating the PMs are more efficiently used in the proposed design. The designs are verified by 3-D finite element. Despite the small torque reduction, the efficiency of the proposed design is still about the same as the Camry design.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2017.2687879