Effect of air gap eccentricity on rotor eddy current loss in high speed PMSM used in FESS

Author

Pei Yulong ; Li Xing ; Li Yi ; Chai Feng

Author_Institution

Dept. of Electr. Eng., Harbin Inst. of Technol., Harbin, China

fYear

2014

fDate

7-11 July 2014

Firstpage

1

Lastpage

6

Abstract

This paper investigates the effect of eccentric rotor on the eddy losses in high speed external rotor PMSM, which is used in Flywheel Energy Storage System (FESS). Analytical expressions for the no-load magnetic field distribution with static and dynamic rotor eccentricities are presented. The relationship between additional eddy loss and eccentricity ratio is given. Then the finite element simulations are used to analyze the rotor loss and the eddy current distribution respectively due to different types of eccentricity (static and dynamic eccentricity) and eccentric angles. It is showed that static eccentricity makes rotor eddy loss multiply increase and dynamic eccentricity at a specific angle will cause the eddy current loss concentrated in certain magnet.

Keywords

eddy current losses; finite element analysis; flywheels; machine insulation; magnetic fields; permanent magnet motors; synchronous motors; FESS; air gap eccentricity; dynamic rotor eccentricities; eccentric rotor; eddy current distribution; finite element simulations; flywheel energy storage system; high speed external rotor PMSM; no-load magnetic field distribution; rotor eddy current loss; static rotor eccentricities; Eddy currents; Harmonic analysis; Magnetic fields; Magnetic flux; Magnetic losses; Rotors; Stator windings; Air Gap Eccentricity; FESS; High Speed PMSM; Rotor Eddy Loss;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Launch Technology (EML), 2014 17th International Symposium on

Conference_Location

La Jolla, CA

Type

conf

DOI

10.1109/EML.2014.6920669

Filename

6920669