Patent ID: 9356477
Filing Date: 2016-05-31
CPC Classification: F03G,H02K,Y10S

Claim Text:
1. A rotation assistance mechanism for imparting momentum to the rotation of an axle around a rotation axis, comprising: an attraction unit including a pair of magnetic members, the pair of magnet members located with opposite poles facing each other; a magnet drive unit configured to change a distance between the pair of magnetic members in one or more predetermined cycles by a rotation of an axle around a rotation axis; a shield unit provided to be advanced to and retracted from between the pair of magnetic members facing each other; and a shield drive unit configured to advance the shield unit to between the pair of magnetic members in the one or more predetermined cycles when the distance between the pair of magnetic members is contracted, and retract the shield unit from between the pair of magnetic members in the one or more predetermined cycles when the distance between the pair of magnetic members is expanded, wherein the shield unit has a pair of magnetic surfaces facing the pair of magnetic members respectively, the pair of magnetic surfaces having magnetic polarities opposite to those of the corresponding surfaces of the pair of magnetic members respectively.