This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Mechanical Drag Model for an Electric Machine
Technical Paper
2017-01-1230
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
Mechanical losses in electric machines can contribute significantly to overall system losses in an electric drive [1]. With a permanent magnet synchronous machine (PMSM), measuring mechanical losses is difficult without an un-magnetized rotor. Even with an un-magnetized rotor, physical testing can be time consuming and expensive. This paper presents a simple theoretical model of mechanical drag in an electric machine. The model was built using calculations for bearing, seal, and windage drag and was compared to experimental results from testing with un-magnetized motors. Based on this information, the model was modified to better represent the physical system. The goal of this work is to understand the contributors to mechanical drag, to be able to estimate mechanical losses without physical testing, and to be able to quickly evaluate design choices that could reduce mechanical losses.
Citation
Goldstein, C. and Hetrick, J., "Mechanical Drag Model for an Electric Machine," SAE Technical Paper 2017-01-1230, 2017, https://doi.org/10.4271/2017-01-1230.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 |
Also In
References
- Tong Wei , Mechanical Design of Electric Motors Boca Raton, Florida; London, [England] CRC Press 2014
- Vrancik James E. , Prediction of Windage Power Loss in Alternators. Technical paper no. TN D-4849. NASA Lewis Research Center Cleveland, Ohio NASA 1968
- Batten W. M. J. , Bressloff N. W. , and Turnock S. R. Transition from Vortex to Wall Driven Turbulence Production in the Taylor-Couette System with a Rotating Inner Cylinder International Journal for Numerical Methods in Fluids 38 3 2002 207 26 10.1002/fld.208
- Wild P. M. , Djilali N. , and Vickers G. W. Experimental and Computational Assessment of Windage Losses in Rotating Machinery Journal of Fluids Engineering 118 1 1996 116 22 10.1115/1.2817488
- The SKF Model for Calculating the Frictional Moment The SKF Model for Calculating the Frictional Moment October 2016 http://www.skf.com/group/products/bearings-units-housings/ball-bearings/principles/friction/skf-model/index.html
- SKF Bearing Calculator SKF Bearing Calculator October 2016 http://webtools3.skf.com/BearingCalc/home.action
- NSK Technical Calculations October 2016 http://www.jp.nsk.com/app02/BearingGuide/m/html/en/TopS.html
- Friction Radial Shaft Seals Friction October 2016 http://www.skf.com/us/products/seals/industrial-seals/power-transmission-seals/radial-shaft-seals/friction/index.html
- Guo Fei , Jia Xiaohong , Longke Wang , Salant Richard F. , and Wang Yuming The Effect of Wear on the Performance of a Rotary Lip Seal J. Tribol. Journal of Tribology 136 4 2014 10.1115/1.4027623
- Bilgen E. , and Boulos R. Functional Dependence of Torque Coefficient of Coaxial Cylinders on Gap Width and Reynolds Number Journal of Fluids Engineering March 1973
- Nelka John J. , Evolution of a Rotating Disk Apparatus: Drag of a Disk Rotating in a Viscous Fluid 3851 Ship Performance Department, Naval Ship Research and Development Center Bethesda, MD U.S. Naval Acadamy 1973
- Dorfman , L. A. Hydrodynamic Resistance and the Heat Loss of Rotating Solids First Oliver and Boyd 1963
- Tong , Wei , and Gott Brain E.B. Method of Minimizing Rotor Body Windage Loss US Patent US 6438820 B1
- Ren , Wei-Min Windage and Axial Friction Losses of High Speed Generator 2003 International Joint Power Generation Conference 2003 10.1115/ijpgc2003-40078
- Howey David A. , Childs Peter R. N. , and Holmes Andrew S. Air-Gap Convection in Rotating Electrical Machines IEEE Transactions on Industrial Electronics 59 3 2012 1367 375 10.1109/tie.2010.2100337