风机与电动机之间由联轴器链接，传递运动和转矩。不对中是风机最常见的故障，风机的故障60%与不对中相关。风机的不对中故障是指风机、电动机两转子的轴心线与轴承中心线的倾斜或偏移程度。风机转子的不对中可以分为联轴器不对中和轴承不对中。风机转子系统产生不对中故障后，在旋转过程中会产生一系列对设备运行不利的动态效应，引起联轴器的偏转、轴承的磨损、油膜稳态和轴的挠曲变形等，不仅使转子的轴颈与轴承的相互位置和轴承的工作状态发生了变化，也同时降低了轴系的固有频率，使转子受力及轴承所受的附加力导致风机的异常振动和轴承的早期损坏，危害极大。对于风机的不对中故障，可以用激光对中仪来解决，方便快捷。
The fan and the motor are connected by a coupling to transmit the movement and torque. Misalignment is the most common fault of fan. 60% of the faults of fan are related to misalignment. The misalignment fault of the fan refers to the inclination or deviation degree between the axis lines of the two rotors of the fan and the motor and the bearing center lines. The misalignment of fan rotor can be divided into coupling misalignment and bearing misalignment. After the rotor system of the fan has misalignment fault, it will produce a series of adverse dynamic effects on the operation of the equipment in the process of rotation, which will cause the deflection of the coupling, the wear of the bearing, the steady state of the oil film and the deflection and deformation of the shaft, not only make the mutual position of the rotor journal and the bearing and the working state of the bearing change, but also reduce the natural frequency of the shaft system, and make the rotor suffer The abnormal vibration of the fan and the early damage of the bearing are caused by the force and the additional force of the bearing. For the fan misalignment fault, it can be solved by laser centering instrument, which is convenient and quick