This paper presents initial measurements of the efficiency of NASA's 2nd magnetic gear prototype. A detailed discussion of the test rig's design and capabilities was presented, along with 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 :

    Dynamic Testing of a High-Specific-Torque Concentric Magnetic Gear



    Conference:

    Annual Forum & Technology Display - The Future of Vertical Flight ; 2019 ; Philadelphia, PA, United States


    Publication date :

    2019-05-13


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




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