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What causes air compressor motor vibration?

2 Stage Screw Air Compressor with Axial Fan


Why does the air compressor motor vibrate when it is running? Does the motor vibration have an impact on the operation of the air compressor? What is the cause of the air compressor motor vibration?

2 Stage Screw Air Compressor with Axial Fan

1.Electromagnetic aspects


Motor vibration is often due to uneven air gaps, causing unilateral electromagnetic pulling force, which in turn further increases the air gap. This electromechanical hybrid effect manifests as motor vibration. It is also possible that the electromagnetic pulling force caused by the gravity of the rotor itself or the installation level and the center of the magnetic force are incorrect, causing axial movement of the motor, causing increased vibration of the motor, and in severe cases, shaft wear and tear, causing the temperature of the bearing to rise rapidly. If there is something wrong with the gears or couplings connected to the motor. This kind of failure mainly manifests as poor gear meshing, severe gear tooth wear, poor lubrication of the opposite wheel, skewed and misaligned couplings, incorrect tooth shape and pitch of the gear coupling, excessive clearance or severe wear, all of which will cause certain problems. vibration.

2 Stage Screw Air Compressor with Axial Fan

  1. Motor structure


The motor itself has structural defects and installation problems. The main faults are as follows: elliptical journal, bent shaft, too large or too small gap between the shaft and the bearing bush, defects in the bearing seat, foundation plate, certain parts of the foundation and even the entire motor installation foundation. The stiffness is not enough, the motor and the base plate are not firmly fixed, the foot bolts are loose, the bearing seat and the base plate are loose, etc. If the gap between the shaft and the bearing bush is too large or too small, it can not only cause vibration but also cause abnormalities in the lubrication and temperature of the bearing bush. The rotor is unbalanced, the rotating shaft is bent, the slip ring is deformed, the stator and rotor air gaps are uneven, the stator and rotor magnetic centers are inconsistent, bearing failure, poor foundation installation, insufficient strength of the mechanical mechanism, resonance, loose anchor screws, and damaged motor fans.

2 Stage Screw Air Compressor with Axial Fan



Poor coupling connection, inaccurate coupling centering, unbalanced load machinery, system resonance, etc. The shaft system of the linkage part is misaligned, the center lines do not coincide, and the centering is incorrect. The main cause of this failure is poor alignment and improper installation during the installation process. Another situation is that the center lines of some linkage parts are coincident in the cold state, but after running for a period of time due to the deformation of the rotor fulcrum, foundation, etc., the center lines are destroyed again, resulting in vibration.

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