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.
| Original language | English |
|---|---|
| Article number | 5238577 |
| Pages (from-to) | 1947-1953 |
| Number of pages | 7 |
| Journal | IEEE Transactions on Industry Applications |
| Volume | 45 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2009 Nov 1 |
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Keywords
- Ac machines
- Analytical and numerical harmonic analyses
- Eddy currents
- Electromagnetic shielding
- Rotor surface losses
- Solid rotor
- Synchronous machines
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Control and Systems Engineering
- Industrial and Manufacturing Engineering
Cite this
Optimization of shield thickness of finite-length solid rotors for eddy-current loss minimization. / Shah, Manoj R.; Lee, Sang Bin.
In: IEEE Transactions on Industry Applications, Vol. 45, No. 6, 5238577, 01.11.2009, p. 1947-1953.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Optimization of shield thickness of finite-length solid rotors for eddy-current loss minimization
AU - Shah, Manoj R.
AU - Lee, Sang Bin
PY - 2009/11/1
Y1 - 2009/11/1
N2 - 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.
AB - 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.
KW - Ac machines
KW - Analytical and numerical harmonic analyses
KW - Eddy currents
KW - Electromagnetic shielding
KW - Rotor surface losses
KW - Solid rotor
KW - Synchronous machines
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UR - http://www.scopus.com/inward/citedby.url?scp=81055124910&partnerID=8YFLogxK
U2 - 10.1109/TIA.2009.2031895
DO - 10.1109/TIA.2009.2031895
M3 - Article
AN - SCOPUS:81055124910
VL - 45
SP - 1947
EP - 1953
JO - IEEE Transactions on Industry Applications
JF - IEEE Transactions on Industry Applications
SN - 0093-9994
IS - 6
M1 - 5238577
ER -