Causes of motor vibration

Hazards of motor vibration：

Motor vibration, will make the winding insulation and bearing life shortened, affecting the normal lubrication of the sliding bearings, vibration force to promote the expansion of the insulation gap, so that the outside world dust and moisture invasion, resulting in reduced insulation resistance and leakage current increases, and even the formation of insulation breakdown and other accidents. In addition, motor vibration, and easy to make the cooler water pipe vibration crack, welding point vibration open, at the same time will cause damage to the load machinery, reduce the accuracy of the workpiece, will cause all the vibration of the mechanical part of the fatigue, will make the ground screws loose or broken, the motor will cause carbon brushes and the slip ring of the abnormal wear and tear, and even serious brush fire and burned collector ring insulation, the motor will produce a lot of noise, the situation Generally in the DC motor also happens from time to time.

causes of motor vibration：
1, rotor, coupler, coupling, drive wheel (brake wheel) caused by imbalance.
2、Loose core bracket, oblique key, pin failure and loosening, rotor binding is not tight will cause the rotating part of the imbalance.
3, linkage part of the shaft system is not centered, the center line does not coincide, centering is not correct. The cause of this failure is mainly due to the installation process, poor alignment, improper installation.
4, the linkage part of the center line in the cold state is coincident, but after running for some time due to the rotor pivot, foundation deformation, the center line is destroyed, thus generating vibration.
5, with the motor connected to the gear, coupling faults, poor gear bite, gear teeth wear serious, poor lubrication of the wheel, coupling skewed, misaligned, tooth coupling tooth shape, tooth distance is not right, excessive clearance or wear, will cause a certain amount of vibration.
6, defects in the structure of the motor itself, journal oval, bending of the rotor shaft, too large or too small a gap between the shaft and the axial tile, bearing housing, foundation plate, a part of the foundation and even the entire motor mounting base of the rigidity is not enough.
7, the installation of the problem, the motor and the foundation plate is not firmly fixed between the foot bolts loose, the bearing seat and the foundation plate between the loose and so on.
8, the clearance between the shaft and the shaft tile is too large or too small can not only cause vibration but also make the lubrication and temperature of the shaft tile to produce abnormalities.
9, the motor dragged by the load conduction vibration, for example, the motor dragged by the fan, pump vibration, caused by motor vibration.

10, AC motor stator wiring error, wire-wound asynchronous motor rotor winding short circuit, synchronous motor excitation winding turn-to-turn short circuit, synchronous motor excitation coil connection error, cage asynchronous motor rotor broken bars, rotor core deformation caused by stator and rotor air gap is not uniform, resulting in air gap flux imbalance and thus cause vibration.