Investigation of Effects of Asymmetries on the Performance of Permanent Magnet Synchronous Machines

Asymmetries in permanent magnet synchronous machines (PMSM) can result from manufacturing tolerances or optimization techniques that deliberately introduce them on rotor, stator, or both. This paper analyzes the impact of such unbalance on the air gap pressure, that is radial and tangential to the d...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2017-09, Vol.32 (3), p.1002-1011
Main Authors: Pina Ortega, Alejandro J., Xu, Longya
Format: Article
Language:English
Subjects:
Asymmetry
cogging
Magnetic domains
permanent magnet synchronous machines
Perpendicular magnetic anisotropy
PMSM
radial force
ripple
Rotors
Saturation magnetization
Stators
tangential force
UMP
unbalanced magnetic pulling
Vibrations
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Summary:Asymmetries in permanent magnet synchronous machines (PMSM) can result from manufacturing tolerances or optimization techniques that deliberately introduce them on rotor, stator, or both. This paper analyzes the impact of such unbalance on the air gap pressure, that is radial and tangential to the direction of motion, by means of Maxwell Stress Tensor; also, their consequences on torque pulsations and unbalanced magnetic pulling. Neglecting the manufacturing variations in the analysis of high power density PMSMs underestimates the resultant torque ripple. Additionally, new vibration modes occur due to unbalanced radial pressure. On the other hand, a geometry optimized to minimize torque ripple through controlled asymmetry is investigated, the approach compensates harmonics in torque effectively, but such compensation does not have the same effect on radial forces. Finite element analysis and experimentation are used to support the analysis and it is found that an asymmetric PMSM with low torque ripple will not necessarily produce lower vibrations and noise.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2017.2684165