Aeronautical Magnetic Torque Limiter for Passive Protection against Overloads

Abstract

Actual aerospace and defense technologies present multiple limitations that need to be overcome in order to evolve to less contaminating and more efficient aircraft solutions. Contactless technologies come with essential advantages such as the absence of wear and friction. This work describes the design, prototype, and performance test according to RTCA-DO-160 of an aeronautical magnetic torque limiter. The results show correct continuous transmission operation (2250 rpm and 24 Nm) from −50 • C to +90 • C. Moreover, overload protection has been demonstrated for more than 200 jamming events without damage or required maintenance to the device.

Towards Miniaturization of Magnetic Gears: Torque Performance Assessment

“…In any case, bearings are not the most critical part in a mechanical transmission. Additionally, specific magnetic designs can be considered in order to balance bearings loads [ 24 ].…”

“…Most of these components have been already tested demonstrating their feasibility in macroscale [ 22 , 23 , 24 , 25 ] avoiding friction in the teeth transmission or in the bearings. Furthermore, they can be/have been combined (bearings, gear, and coupling) as demonstrated in the first contactless machine ever built [ 26 ].…”

Modelling and Test of an Integrated Magnetic Spring-Eddy Current Damper for Space Applications

“…All the configurations (with 2, 3, and 4 magnets) were mounted and tested in order to characterize dynamically their behavior. = − 0 (11) where…”

“…The transmissibility curve for each configuration was calculated using Equation (11) and presented in Figure 16. The measured natural frequency ω 0 is 4.98 Hz (31.4 rad/s) common for all configurations.…”

“…High performant magnetic systems appeared after the development of high magnetic 2 of 18 product magnets based on Nd-Fe-B alloys [8,9]. This type of new magneto-mechanisms have in common some unique features: cleanness, oil-free, reliability, low wear, no power consumption, long life, and low noise [10][11][12][13][14][15][16][17][18][19][20].…”