TY - JOUR
T1 - Influence of copper plating on electromagnetic and temperature fields in a high-speed permanent-magnet generator
AU - Weili, Li
AU - Hongbo, Qiu
AU - Xiaochen, Zhang
AU - Ran, Yi
N1 - Funding Information:
This work was supported in part by the National High Technology Research and Development Program of China (863 Program) under Grant 2007AA050501, and also in part by the Hei-longjiang Critical Priority Research under Grant GB08A302.
PY - 2012
Y1 - 2012
N2 - In a high-speed permanent-magnet generator (HSPMG), an alloy sleeve is often used to prevent damage to rotor magnets caused by the large rotational centrifugal forces. However, eddy-current losses appearing in the sleeve increase the generator working temperature, which may reduce the generator performance and even cause thermal demagnetization of the magnets. Thus, a sleeve scheme designed with low eddy current losses is necessary, and a rotor structure with copper plating is presented in this paper. The two-dimensional mathematical model of a 117 kW, 60000 rpm HSPMG is established, and the electromagnetic field in the generator is calculated using the finite element method. The results show the effectiveness of the copper plating in reducing the eddy current losses in the rotor, and the influences of the sleeve thickness and the copper layer thickness on rotor eddy current losses are analyzed. Using the fluid-thermal coupling method, the temperature distribution of the generator with different copper layer thicknesses is comparatively analyzed based on the theories of fluid mechanics and heat transfer. The relationship between the temperature and the copper layer thickness is obtained, and finally the temperature of the permanent magnets, which is the part most seriously affected by the temperature, is given with different copper layer thicknesses. The obtained conclusions may provide useful reference for the design and research of HSPMG.
AB - In a high-speed permanent-magnet generator (HSPMG), an alloy sleeve is often used to prevent damage to rotor magnets caused by the large rotational centrifugal forces. However, eddy-current losses appearing in the sleeve increase the generator working temperature, which may reduce the generator performance and even cause thermal demagnetization of the magnets. Thus, a sleeve scheme designed with low eddy current losses is necessary, and a rotor structure with copper plating is presented in this paper. The two-dimensional mathematical model of a 117 kW, 60000 rpm HSPMG is established, and the electromagnetic field in the generator is calculated using the finite element method. The results show the effectiveness of the copper plating in reducing the eddy current losses in the rotor, and the influences of the sleeve thickness and the copper layer thickness on rotor eddy current losses are analyzed. Using the fluid-thermal coupling method, the temperature distribution of the generator with different copper layer thicknesses is comparatively analyzed based on the theories of fluid mechanics and heat transfer. The relationship between the temperature and the copper layer thickness is obtained, and finally the temperature of the permanent magnets, which is the part most seriously affected by the temperature, is given with different copper layer thicknesses. The obtained conclusions may provide useful reference for the design and research of HSPMG.
KW - Copper plating
KW - eddy current loss
KW - high-speed permanent-magnet generator
KW - thermal analysis
UR - http://www.scopus.com/inward/record.url?scp=84864751426&partnerID=8YFLogxK
U2 - 10.1109/TMAG.2012.2190740
DO - 10.1109/TMAG.2012.2190740
M3 - Article
AN - SCOPUS:84864751426
SN - 0018-9464
VL - 48
SP - 2247
EP - 2253
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 8
M1 - 6168839
ER -