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Permanent Magnet High-Speed Generator for FTT Micro Turbine

Performance Requirements. Proposed Design. Machine type: Permanent magnet synchronous generator Number of Poles: 4 Number of Phases: 3 Nominal Speed: 100,000 RPM. Proposed Electrical Layout. . Outer core. Inner core. . . Magnet. . Shaft. Physical Layout. Winding Pattern. Electromagnetic Performance.

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Permanent Magnet High-Speed Generator for FTT Micro Turbine

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    1. Permanent Magnet High-Speed Generator for FTT Micro Turbine Jinho Kim, Daniel Kirk and Hector Gutierrez Mechanical & Aerospace Engineering Florida Institute of Technology

    2. Performance Requirements

    3. Proposed Design

    4. Proposed Electrical Layout

    5. Electromagnetic Performance

    6. Electromagnetic Performance

    7. Mechanical Layout in High-Speed Electrical Machinery (18 to 120 kRPM)

    8. Mechanical Layout in High-Speed Electrical Machinery (18 to 120 kRPM)

    9. Proposed Mechanical Design Permanent magnets bonded to grooves in rotor core Torsional stress in rotor shaft is modest (~ 2.3 MPa) Critical mechanical requirement given by centrifugal forces Containment sleeve required to protect rotor from large centrifugal forces Sleeve made of pre-stressed high-strength material

    10. Proposed Mechanical Layout

    11. Analysis of Critical Mechanical Stress

    12. Thermal Analysis

    13. Results Temperature Distributions

    14. Conclusions Proposed design meets all electrical requirements Containment of centrifugal forces achieved by pre- stressed sleeve Critical mechanical stresses verified under worst-case conditions Estimated operating temperature ~ 410K Proposed magnetic material (SmCo5) has max service temperature of 523K Loss of nominal magnetic coercivity at the operating temperature ~ 2%

    15. Future Work Detailed mechanical component design Detailed 3-D finite-element verification of Electromagnetic performance Structural integrity Thermal analysis Heat transfer Analysis / design of electronic power converter

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