Abstract
Magnetic gears have advantages such as having low acoustic noise and being maintenance-free in comparison with widely-used mechanical gears. This paper deals with a magnetic planetary gear which has inner and outer surface permanent-magnet rotors, and has ferromagnetic-stator pole pieces arranged between both rotors. The magnetic planetary gear has higher transmission torque than other types of magnetic gears since all rotor magnets continuously contribute to generating torque. However, it has not been put into practical use yet. To achieve future practical use, this paper describes a method of improving the efficiency of magnetic planetary gears.
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