Types of rotor: rotor permanent bending and bending two temporary situations.

1. permanent bending refers to the rotor shaft Bow cannot be recovered. Cause permanent bending due to design and manufacturing defects (uneven hinge structure, material properties), long-term parking method, thermal shutdown delays when turning or being cold water quenching.

2. temporary bending refers to the recovery of bending. Causes bending due to a temporary overload, open warm-up in runtime without full and speed up rapid temperature rise caused by local rubbing rotor thermal deformation, such as uneven.