Optimization of Shield Thickness of Finite-Length Solid Rotors for Eddy-Current Loss Minimization
- Authors
- Shah, Manoj R.; Lee, Sang Bin
- Issue Date
- 11월-2009
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- AC machines; analytical and numerical harmonic analyses; eddy currents; electromagnetic shielding; rotor surface losses; solid rotor; synchronous machines
- Citation
- IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, v.45, no.6, pp.1947 - 1953
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
- Volume
- 45
- Number
- 6
- Start Page
- 1947
- End Page
- 1953
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/118957
- DOI
- 10.1109/TIA.2009.2031895
- ISSN
- 0093-9994
- Abstract
- A high-conductivity shield is often used for coating the rotor of solid-rotor synchronous machines for reducing the surface eddy-current losses due to armature-reaction space/time harmonics and/or tooth ripple. Since the design process for determining the optimal shield thickness can be complicated and time consuming, a simple analytical model based on Maxwell's equations was developed and presented in a previous paper to simplify the process. It has been shown that such an analytical tool can be used as a quick and effective "screening tool" for determining the range of the optimal shield thickness for minimizing rotor surface losses; however, the influence of finite rotor axial length including the end-face losses was not taken into account. In this paper, an additional step is introduced in the shield design process where a special finite-element (FE) method that accounts for the impact of finite rotor axial length is employed for refining the design obtained from the analytical solution. Comparisons are made for a number of shield thicknesses and rotor lengths for significant space and time harmonic combinations to verify the validity of the proposed two-step design process ( analytical and FE) and to evaluate the impact of the finite length of solid rotors.
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