Mechanical gears are wisely used to transmit power, and change speeds in various applications, as shown in Fig. 1. However, these gears have some disadvantages, such as noise, friction, heat which may ruin them or make them dysfunctional. Therefore, magnetic gears were developed to drive power instead of mechanical ones [1]. Magnetic gears are much quieter and are both more reliable and effective than these mechanical counterparts. In this paper, a novel magnetic planetary gear (MPG) is proposed and illustrated in Fig. 2, which is composed of one magnetic sun gear, one magnetic ring gear, and three magnetic planet gears. Because the contact-free gear structure results in lower stiffness, proper design methods are needed to improve gear properties.
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