Causes of shaft locking phenomenon of explosion-proof motor

A, explosion-proof motor bearing itself failure

Due to the influence of heat, the bearing of explosion-proof motor will fail. The bearing of explosion-proof motor can run well under good lubrication condition, and the bearing of explosion-proof motor can be directly damaged as a whole.

Second, the explosion-proof motor bearing lubrication

It is very convenient to fill the grease of explosion-proof motor, and the temperature resistance (-10~130℃) of the grease can meet the lubrication requirements of explosion-proof motor bearings.

Three, explosion-proof motor bearing gland and journal radial friction

Based on the analysis of radial clearance between bearing gland and journal of explosion-proof motor, according to the requirements of national standards, explosion-proof motor must ensure that the flammable and explosive media outside the motor will not be ignited by the gap cooling effect of the mouth seal and the moving part leading to the outside under the condition of internal electrical spark.

Four, explosion-proof motor rotor vibration

The bending of explosion-proof motor shaft will cause the gap between bearing gland and mating journal to change, and the bending and unbalance of rotor will cause the vibration of motor rotor to increase during operation, and the bending of rotor will cause the gap to decrease and the vibration displacement, which have mutual effects on the failure of mating gap.

Measures for shaft locking fault of explosion-proof motor;

By disassembling and inspecting the fault explosion-proof motor and referring to the technical data of similar fault maintenance, it can be seen that the shaft-locking fault of the motor bearing is caused by the friction and heat between the gland and the rotor journal, which leads to the failure of bearing grease at high temperature. The bearing runs in a state of poor lubrication, and the friction between the gland and the rotor journal becomes more serious due to bearing wear, which finally leads to the high-temperature adhesion of the bearing gland and the journal, resulting in the motor overload protection tripping.

Strictly control the dimensional tolerance of the end cover seat hole and the bearing matching journal. Regular maintenance of explosion-proof motor bearings, long-term lubrication of explosion-proof motor.

For more information about motors, please pay attention to the Xi 'an explosion-proof motor website.