Patent ID: 9748051
Date: 2017-08-29
CPC Classifications: H01F,H01H,H02K,H02P

Claim:
1. An operating mechanism for a power switching device for mutually shifting said power switching device between an interrupted condition and closed condition by reciprocating drive of a movable contact thereof, said operating mechanism comprising: a first row of permanent magnets constituted by arranging annular or arcuate first permanent magnets adjacently so that magnetic poles of said first permanent magnets are rotated by a maximum of 90° in each case in a cross-sectional plane including their central axes; a second row of permanent magnets constituted by arranging annular or arcuate second permanent magnets adjacently so that magnetic poles of said second permanent magnets are rotated by a maximum of 90° in each case in a cross-sectional plane including their central axes; a double cylinder that is fixed so that two rows maintain a fixed distance, with said first permanent magnets and said second permanent magnets, whose magnetization vector radial components are in the same direction, facing each other; a floating output ring arranged with a coil constituted by a conductor wound thereon, between said first row of first permanent magnets and said second row of said second permanent magnets, and having no mechanical restraining relationship with other members, apart from being directly or indirectly linked with said movable contact; and an exciting means for generating current for exciting said coil, wherein said exciting means comprises: a supporting force control means for keeping central axes of said double cylinder and said floating output ring coincident by generating supporting force for said floating output ring by magnetism, by controlling d axis current component of said exciting current, the d axis component contributing to magnetic field of said coil; and a thrust control means for generating an axial thrust between said double cylinder and said floating output ring by controlling q axis current component of said exciting current, said q axis current contributing to thrust of said coil.