Details
| Original language | English |
|---|---|
| Pages (from-to) | 2299-2308 |
| Number of pages | 10 |
| Journal | Electrical Engineering |
| Volume | 100 |
| Issue number | 4 |
| Early online date | 2 Jul 2018 |
| Publication status | Published - Dec 2018 |
Abstract
This paper presents the design and analysis of fractional-slot concentrated-windings for use with direct liquid cooling. To achieve considerably higher torque density than state of the art of electrical machines, recently patented cast coils that allow slot fill factors up to 90% are considered as basis for further enhancement. The sensitivity of large conductors to high losses due to current displacement as well as the implementation of direct liquid cooling of every single conductor is discussed. Two innovative coil designs are developed and compared, in consideration of current displacement using finite element methods, with basic trapezoidal cast coils. The heat dissipation capacities of the new coil designs are tested analytically as well as by measurement. Additionally, different cooling mediums are compared for their suitability for direct liquid cooling of coils. The proposed coil designs lead to possible current densities of 100Amm2 and to a reduction of the additional losses to about 50 %.
Keywords
- Cast coils, Current density, Current displacement, Direct liquid cooling, Three-dimensional printing, Tooth-coils
ASJC Scopus subject areas
- Engineering(all)
- Electrical and Electronic Engineering
- Mathematics(all)
- Applied Mathematics
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Electrical Engineering, Vol. 100, No. 4, 12.2018, p. 2299-2308.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Design and direct liquid cooling of tooth-coil windings
AU - Wohlers, Constantin
AU - Juris, Peter
AU - Kabelac, Stephan
AU - Ponick, Bernd
N1 - Publisher Copyright: © 2018, Springer-Verlag GmbH Germany, part of Springer Nature. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/12
Y1 - 2018/12
N2 - This paper presents the design and analysis of fractional-slot concentrated-windings for use with direct liquid cooling. To achieve considerably higher torque density than state of the art of electrical machines, recently patented cast coils that allow slot fill factors up to 90% are considered as basis for further enhancement. The sensitivity of large conductors to high losses due to current displacement as well as the implementation of direct liquid cooling of every single conductor is discussed. Two innovative coil designs are developed and compared, in consideration of current displacement using finite element methods, with basic trapezoidal cast coils. The heat dissipation capacities of the new coil designs are tested analytically as well as by measurement. Additionally, different cooling mediums are compared for their suitability for direct liquid cooling of coils. The proposed coil designs lead to possible current densities of 100Amm2 and to a reduction of the additional losses to about 50 %.
AB - This paper presents the design and analysis of fractional-slot concentrated-windings for use with direct liquid cooling. To achieve considerably higher torque density than state of the art of electrical machines, recently patented cast coils that allow slot fill factors up to 90% are considered as basis for further enhancement. The sensitivity of large conductors to high losses due to current displacement as well as the implementation of direct liquid cooling of every single conductor is discussed. Two innovative coil designs are developed and compared, in consideration of current displacement using finite element methods, with basic trapezoidal cast coils. The heat dissipation capacities of the new coil designs are tested analytically as well as by measurement. Additionally, different cooling mediums are compared for their suitability for direct liquid cooling of coils. The proposed coil designs lead to possible current densities of 100Amm2 and to a reduction of the additional losses to about 50 %.
KW - Cast coils
KW - Current density
KW - Current displacement
KW - Direct liquid cooling
KW - Three-dimensional printing
KW - Tooth-coils
UR - http://www.scopus.com/inward/record.url?scp=85049599900&partnerID=8YFLogxK
U2 - 10.1007/s00202-018-0704-x
DO - 10.1007/s00202-018-0704-x
M3 - Article
AN - SCOPUS:85049599900
VL - 100
SP - 2299
EP - 2308
JO - Electrical Engineering
JF - Electrical Engineering
SN - 0948-7921
IS - 4
ER -