Patent ID: 8810099

Claim:
A magnetic planetary gear set, comprising: an annulus gear; a sun gear disposed at an inner center of the annulus gear and configured to revolve on its own axis, wherein at least one of the annulus gear and the sun gear is stationary and comprises a plurality of teeth circularly arranged by the axis of the sun gear, wherein each of the teeth comprises a pole head, one or a plurality of neighboring pole heads is intertwined with and excited by at least a group of coils to form a variable magnetic section, the plurality of pole heads forms a plurality of similar variable magnetic sections in interlaced polarities, and the polarity of each pole head is changed under the coil excitation control of a driver; and a plurality of planet gears disposed between the annulus gear and the sun gear, each planet gear comprising an axle and a plurality of magnetic elements circularly arranged along the surface of the axle; wherein the plurality of planet gears is mounted on planet arms.