Abstract
Gears are common and important components of many types of propulsion systems applied in mechanical engineering. The aim of this paper is to present the mechanical design and performance analysis of a novel two-stage magnetic precession gear (MPG). The main advantage of the proposed design is the ability to obtain higher transmission ratios than other currently known magnetic gear types. A detailed analysis of the performance of the MPG was carried out employing a developed numerical model of the magnetic field in the proposed gear. The MPG model is based on the finite element method (FEM) and allows determining the relations between the torque acting on the main components of the gear, load angles, and air-gap lengths. To validate the developed FEM model, the prototype of an MPG with a 1/144 gear ratio was built and tested. The experiments were also focused on determining the mechanical efficiency as well as the influence of rotational speed and lengths of air gaps on the maximum load torque. The tests indicated that the maximum efficiency of the studied MPG is about 30%, which is comparable to the efficiency of mechanical two-stage precession gears with face meshing.
Highlights
Gear transmissions are components of propulsion systems commonly used to transform parameters of mechanical energy between load and drive systems.In other words, gears are applied to fit the values of the rotational speed and mechanical torque of a power source to the required values of their output parameters [1]
The idea of an magnetic precession gear (MPG) was preceded by mechanical precession gears with face meshing [20]
A decrease in the maximum load torque transmitted by the examined gear at higher rotational speeds can be observed. Such behavior of the MPG can be explained by the impact of the eddy current losses induced in the steel cores [28] and the permanent magnets as well as magneto-mechanical resonances occurring in the studied gear [29,30]
Summary
Gear transmissions are components of propulsion systems commonly used to transform parameters of mechanical energy (torque and speed) between load and drive systems. Gears are applied to fit the values of the rotational speed and mechanical torque of a power source to the required values of their output parameters [1]. The undeniable advantages of mechanical gears are high torque density, efficiency, and ease of manufacture. Their inherent disadvantages include high noise and vibration levels [1,2,3], friction between teeth [4], as well as a substantial maintenance cost. Magnetic gears (MGs) provide contactless transmission of torque, which allows reducing vibrations and noise as well as increasing the durability [5,6,7,8], which decreases maintenance cost
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