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

Scheidler, Justin ; Cameron, Zachary ; Tallerico, Thomas

关键词: AEROSPACE ENGINEERING;    DYNAMIC TESTS;    ELECTRIFIED AIRCRAFT PROPULSION;    ENERGY DISSIPATION;    GEARS;    LOW SPEED;    MAGNETIC PROPERTIES;    PERMANENT MAGNETS;    PROTOTYPES;    TEMPERATURE EFFECTS;    TORQUE;    TRANSDUCERS;    UNCERTAIN SYSTEMS;    URBAN AIR MOBILITY (UAM);   

RP-ID  :  GRC-E-DAA-TN68758

学科分类：机械工程学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

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.