Abstract

Electro-Mechanical Batteries have important advantages compared with chemical batteries, especially in Low Earth Orbit satellites applications. High speed, slot-less, external rotor, permanent magnet machines are used in these systems as Motor/Generator. Commonly, optimizations of electrical machines are done in constant, nominal speed. But Electro-Mechanical Batteries are variable speed system. The efficiency is variable versus time, so, optimization in each single speed cannot necessarily cause the overall efficiency optimization. In this study, iron and copper losses are formulated versus speed variations of rotor. Then, for energy optimization, the optimization speed is achieved by equalizing the average iron loss and copper loss over a period of charge and discharge.

Keywords:

Battery, EMB, energy storage , variable speed,

References

1. Abdi, B., J. Milimonfared, J.S. Moghani1 and A. Kashefi Kaviani, 2008. Simplified design and optimization of slotless synchronous PM machine for micro-satellite's electro-mechanical batteries. Adv. Elec. Comp. Eng., 8(15).
   
2. Abdi, B., J. Milimonfared, J.S. Moghani and A. Kashefi Kaviani, 2009. Simplified design and optimization of slotless halbach machine for micro-satellite's electro-mechanical batteries. Int. Rev. Elec. Eng., 4(2).
   
3. Arslan, M.A., 2008. Flywheel geometry design for improved energy storage using finite element analysis. Mater. Design, 29(2): 514-518.
   CrossRef    
4. Hurley, W.G., W.H. Wölfle and J.G. Breslin, 1998. Optimized transformer design: Inclusive of high-frequency effects. IEEE Trans. Power Elec., 13(4): 651-659.
   CrossRef    
5. Isastia, V. and S. Meo, 2009. Overview on automotive energy storage systems. Int. Rev. Elec. Eng., 4(6): 1122-1144.
   
6. Jang, S., H. Cho, S. Lee, H. Yang and Y. Jeong, 2004. The influence of magnetization pattern on the rotor losses of permanent magnet high-speed machines. IEEE Trans. Mag., 40(4): 2062-2064.
   CrossRef    
7. Kirk, A. and P.A. Studer, 1977. Flywheel energy storage. Int. J. Mech. Sci., 19: 233-245.
   CrossRef    
8. Lee, E., 2003. A micro HTS renewable energy/attitude control system for micro/nano satellites. IEEE Trans. Appl. Superconduct., 13(2): 2263-2266.
   CrossRef    
9. Rodriguez, G.E., P.A. Studer and D.A. Baer, 1983. Assessment of Flywheel Energy Storage for Spacecraft Power Systems. National Aeronautics and Space Administration, Greenbelt, Md, pp: 42.
   
10. Wang, W., 2003. Design of High Speed Flywheel Motor/Generator for Aerospace Applications. Ph.D. Thesis, the Pennsylvania State University.
    Direct Link

Competing interests

The authors have no competing interests.

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The authors have no competing interests.