This presentation presents measurements of the efficiency of NASA's 2nd magnetic gear prototype. A detailed discussion of the test rig used to make these measurements was presented, including a thorough uncertainty analysis. The reported uncertainties are 95% confidence intervals that include the effects of temperature and parasitic loads. The prototype's response was measured at output speeds between 124 rpm and 744 rpm for a controlled output torque of 10 Nm (8% of the prototype's maximum torque). After correcting for tare losses, the prototype's efficiency was found to decrease from 90.0% to 83.0% as speed increased. If the efficiency is extrapolated to a typical operating condition (85% of maximum torque) using the good assumption that energy loss is approximately independent of the transmitted torque,the expected efficiency would be 99.0% to 98.4%, which exceeds the state of the art for these speeds.


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    Title :

    High Speed Testing of a High Efficiency Concentric Magnetic Gear


    Contributors:

    Conference:

    Propulsion and Power Technical Meeting ; 2019 ; Hampton, VA, United States


    Publication date :

    2019-10-29


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




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