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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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