We have been reported on the various magnetic gears. Magnetic gears have many performance characteristics, for example, perfective non-contact, silent, oil less and maintenance free. Recently, we have been developed the magnetic planetary and differential gear. The gearings are would be effective for wind power generators. For the reason, we think that the gear system is able to maintain output speed of sun gear at constant by differential operating outer ring gear in spite of random input

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... of planetary gear. In this report, it is described the test of output speed stability control using the magnet planetary gears with the functional 2 inputs. As the result, it was clarified it was possible to get the stable output speed with this unit.