Loss Analysis of Permanent-Magnet Motors With Concentrated Windings-Variation of Magnet Eddy-Current Loss Due to Stator and Rotor Shapes

In this paper, we investigate losses, including magnet eddy-current loss of permanent-magnet synchronous motors with concentrated windings. A 3-D finite-element method that considers carrier harmonics of pulsewidth modulation inverters is utilized to calculate the losses in each part of the motor se...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2009-07, Vol.45 (4), p.1334-1342
Main Authors: Yamazaki, K., Fukushima, Y., Sato, M.
Format: Article
Language:English
Subjects:
Concentrated winding
eddy-current loss
Finite element methods
finite-element method
iron loss
Magnetic analysis
Magnetic losses
Magnetic separation
Permanent magnet motors
permanent-magnet motor
Pulse inverters
Rotors
Shape
Stators
Synchronous motors
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Summary:In this paper, we investigate losses, including magnet eddy-current loss of permanent-magnet synchronous motors with concentrated windings. A 3-D finite-element method that considers carrier harmonics of pulsewidth modulation inverters is utilized to calculate the losses in each part of the motor separately. A simple linear magnetic circuit model is also introduced in order to understand the mechanism of eddy-current loss generation in the magnet. First, the measured and calculated results are compared to verify the validity of the analysis. Next, the variation of the losses due to the stator and rotor shapes is investigated, for instance, concentrated and distributed stator windings and interior and surface-mounted permanent magnets. It is clarified that the eddy-current loss of the permanent magnet in the concentrated winding motor is much larger than that in the distributed winding motor. The difference of the loss generation mechanism due to the rotor shape is also clarified.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2009.2023393