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Flywheel Storage for Lunar Colonization

Flywheel Storage for Lunar Colonization. University of Idaho Department of Electrical and Computer Engineering. Purpose Statement.

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Flywheel Storage for Lunar Colonization

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  1. Flywheel Storage for Lunar Colonization University of Idaho Department of Electrical and Computer Engineering

  2. Purpose Statement To establish the scientific and technical merit, and feasibility, of using flywheel energy storage systems in support of human colonization and exploration of the lunar surface

  3. Flywheel Storage for Lunar Colonization • Machine Topology Evaluation • Power Electronics and Control • Construction of Test Apparatus

  4. Flywheel Storage for Lunar Colonization Machine Topology Evaluation Ian Higginson

  5. Research Objectives • Evaluate technical merit and feasibility of: • Electrical energy transfer machinery that minimizes iron idling losses • Extreme temperature electronics to manage energy transfer and storage

  6. Flywheel Criteria • No slip rings/commutators • Significant idling iron loss reduction • Low volume • High torque per volume • High torque per mass

  7. Machine Topologies • Synchronous Reluctance • Field Regulated Reluctance • Iron-on-rotor PM; • Ironless stator • Iron rotor • Ironless PM (Halbach array)

  8. Torque per Unit Volume • Synchronous Reluctance: 34.16 kNm/m3 • Field Regulated: 35.52 kNm/m3 • Iron-on-rotor PM: 27.18 kNm/m3 • Ironless PM: 25.33 kNm/m3

  9. Goals • Prepare Phase 2 Proposal • Formalize force density equations • Verify analytical data • Prototype low idle iron loss machine • Develop equations for torque per unit mass

  10. Power Electronics for Lunar Flywheels Power Electronics and Control Christopher Douglas

  11. Research Objectives • Evaluate technical merit and feasibility of: • Electrical energy transfer machinery that minimizes iron idling losses • Extreme temperature electronics to manage energy transfer and storage

  12. Purposes • Operate over extreme temperature range • Reduce excess mass • Increase energy/power density • Develop control method for flywheel

  13. Lunar Environment • Extreme thermal & radiation environment • Phase I involves thermal problems • -190C to +125C • 336 hours of Lunar night/day • Radiation exposure • Heat transfer mechanisms • Conduction • Radiation

  14. Semiconductor Technologies • Silicon on Insulator • Commercial Ratings HTANFET • 90V, 1A • Rated -55C to +225C • Cycle Testing -195C to +85C • Silicon Germanium HBT – Research Data • 50V, 2A • Cycle Testing -195C to 25C • Cycle Testing 25C to 300C

  15. Application • Heated or cooled enclosure • Added mass • Lost energy • Temperature division multiplexing (TDM) • Range dependent electronics • Strategic layout of electronics • Stacked MOSFET topology

  16. Deflux Control • Rotor defluxing method • Decaying sinusoidal current (θr) • Parameters • Decay rates • Frequency of defluxing current

  17. Defluxing - Stator

  18. Future Goals • Prepare phase II proposal • Acquire models for power electronics • Develop control system for lab prototype • Deflux spinning rotor • Investigate: • Temperature division multiplexing • Stacked MOSFET topology • Heat transfer in vacuum

  19. The University of Idaho Construction of Test Apparatus Timothy Hildebrandt, Bryan Hyde, Josh Ulrich, Kord Hubbard

  20. Synchronous Reluctance Machine • Purchase Machine • High Quality Bearings • Controlled Environment • Characterize Losses • Low Friction Machine • Power Electronics • Lunar Environment • Adaptability to Machine

  21. Power Loss Characterization • Present: • Armature resistance • Brush drop losses • Interpole winding resistance • Future: • Iron losses • Difficult to measure

  22. Preliminary Iron Losses • Constant Speed • Vary Gen. Field Current

  23. Power Inverter • Used for defluxing

  24. Future Goals • Prepare for Phase II Proposal • Purchase/Characterize machine • Develop testing strategy • Measure iron losses accurately • Define lunar power requirements

  25. 2010 Timeline for Future Work • April – Sep.: Prepare Phase 2 Proposal • April 30th: Formalize force density equations • May 1st: Begin verification of analytical data • May 15th: Parameterize defluxing method • May – Aug: Investigate TDM scheme • June 1st: Construct flywheel prototype

  26. 2010 Timeline for Future Work • June: Construct prototype electronics system • June – July: Develop testing strategies • June – Aug: Collect data at Boeing • June – Aug: Characterize machine • June – Sept: Investigate switch device models • June – Aug: Develop torque per mass eq’s.

  27. 2010 Timeline for Future Work • Aug: Prepare testing environment • Aug: Design of power electronic system • Aug – Sept: Document results • Sept: Submit Phase 2 Proposal • Sept: Measure losses accurately

  28. The University of Idaho Discussion

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