Design and Analysis of Coaxial Magnetic Gears Considering the Electromagnetic Performance and Mechanical Stress

Many methods for magnetic gear design consider magnetic characteristics only. However, the fixed-pole of a magnetic gear is deformed because of the force of attraction between the two permanent magnets on its inner and outer cores. This strain leads to increased mechanical damage to the magnetic gear, decreasing its efficiency. To address this problem, this paper presents a method for the design and analysis of a magnetic gear that considers mechanical stress. We first use finite-element analysis and an experimental prototype to demonstrate the damage caused by a magnetic characteristics only design. We then show how the design flaws may be fixed through redesign. In the redesigned gear, the stress on the fixed-pole is reduced by 67.5%.