Rotor part locking device and mounting method thereof

The invention discloses a rotor part locking device which is used for fixing the relative positions of a first rotating part, a second rotating part and a static part which are sequentially connected, the first end and the second end of the first rotating part are connected through a step face, and the first rotating part comprises a first fixing ring, a second fixing ring and a third fixing ring; the first fixing ring is locked on the step face of the first rotating piece, the third fixing ring is locked on the outer side of the static piece, and the second fixing ring is installed between the second rotating piece and the static piece and used for fixing the circumferential position of the second rotating piece. The connecting assemblies are used for connecting and fixing the first fixing ring and the third fixing ring so as to lock the first rotating part and the static part; according to the invention, the risk of collision and damage between parts when the rotor part is centered again after the position