Impact of the Rotor Yoke Geometry on Rotor Losses in Permanent-Magnet Machines

This paper presents a study on the rotor losses of surface-mounted permanent-magnet (PM) machine with fractional-slot windings. Two rotor losses sources are considered: the losses due to the slot opening (without currents in the stator) and due to the magneto motive force harmonics (mounting a rotor...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2012-01, Vol.48 (1), p.98-105
Main Authors: Alberti, L., Fornasiero, E., Bianchi, N.
Format: Article
Language:English
Subjects:
Coils (windings)
Computer simulation
Current measurement
Demagnetization
Harmonic analysis
Iron
Loss measurement
Mathematical analysis
Mounting
Permanent-magnet machines
permanent-magnet motors
rotor losses
Rotors
Stator windings
Stators
variable-speed drives
Yokes
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Summary:This paper presents a study on the rotor losses of surface-mounted permanent-magnet (PM) machine with fractional-slot windings. Two rotor losses sources are considered: the losses due to the slot opening (without currents in the stator) and due to the magneto motive force harmonics (mounting a rotor with demagnetized PMs). The rotor losses are measured at no load and under load. It is shown that the rotor losses under load are lower than considering the sum of the two contributions. This phenomenon is investigated using both analytical models and finite-element-based simulations. Then, the impact of the rotor geometry on the rotor losses is considered, and some design advices are reported.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2011.2175680