Torque analysis of magnetic spur gear with halbach magnetized permanent magnets using an analytical method

Abstract

A spur gear is the most common type of gears. They are mounted on parallel shafts. Mechanical spur gears, which play important roles in transmission systems, inherently suffer from the drawbacks of high transmission loss, bulky size, high noise, wear-and-tear. Magnetic spur gears can readily replace mechanical spur gears. Magnetic spur gears have no cut teeth or cogs and they are magnetically coupled by each magnet, therefore, they offer the advantage of isolation, maintenance-free, silent operation and inherent overload protection. These magnetic spur gears have a great potential for medical and chemical applications and micro-transmission systems. This paper discusses the analysis of torque for a magnetic spur gear that uses a Halbach array permanent magnet (PM) using an analytical method. This analytical method has a faster analysis speed than the finite element method (FEM), which is typically used to analyze spur gears and is appropriate for initial design process.