Locking mechanism with repeatable and emergent compulsive unlocking function

A locking mechanism with repeatable and emergent compulsive unlocking function can be used as a protecting device or a magnetic suspension flywheel or a magnetic suspension control moment gyrorotor. The locking mechanism mainly comprises a locking drive, a locking column, a bracket, a microswitch and a compulsive drive. Both the locking drive and the compulsive drive comprise a magnet seat, a permanent magnet, an electrical pure iron ring, a suction cup, a coil and a movable column. Both ends of the locking column are respectively a locking working surface and a driving working surface, and the rotor is locked or unlocked by converting the up and down movement of the movable column to the rotation of the locking column around a rotating shaft. The locking state of the rotor is judged by separating and jointing between the contact point of the microswitch and the locking column. When the locking drive is ineffective, the compulsive drive drives the movable column of the locking drive to move and realize emergent unlocking. The locking device protects the magnetic suspension flywheel or a magnetic suspension control moment gyro system, and has the advantages of reusability, high reliability, simple structure and the like.