A magnetic gearbox (MG) offer the ability to operate with low noise and vibration. It's non-contact operation means that no gear lubrication is required and MGs have inherent overload protection [1-4]. A MG also has the potential for high efficiency [5]. Coaxial MG's have been shown to be capable of achieving active region torque densities above 200Nm/L [6]. However, single-stage coaxial MG designs are only able to achieve a high torque density at a low gear ratio [7, 8]. Typically less than 8:1. There are many applications in which a significantly higher gear ratio is desirable, such as in robotic and power generation applications.
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