Shaft current, motor bearing killer

Shaft current is frequency conversion motor, large and medium-sized motor, high voltage motors and generators killer, one of the great quality of motor bearing damage is huge. Because the current preventive measures are not in a timely manner to produce motor bearing fault cases. Shaft current feature is low voltage high current, the damage to the bearing can say it's helpless. Shaft currents cause is the result of shaft voltage and closed loop, to deal with shaft current problems can be from removal of shaft voltage or disconnect control loop in two ways to carry out the processing. Imbalance, the equivalent circuit of inverter power supply system, point discharge, electrostatic effect and external switch power influence is will cause the shaft voltage, shaft voltage amplitude value generally smaller, but do it will penetrate the bearing grease film after a certain value, according to the bearing surface form a closed loop, shaft current will cause motor bearing within a very short term hot burning. Due to the damage of shaft current of motor bearing surface on the surface of the bearing inner hole left wave grain imprint. To avoid the shaft current problems to address, in the design stage of the motor, be sure to use the production process required, such as ascending in the bearing end cover, bearing sleeve required insulation, in view of the small specifications products can choose insulation bearing, also can discharge the motor carbon brush in the application phase of ascension. From the Angle of application, countermeasures on parts adopt countermeasures of short circuits is once and for all, and the selection of drainage method will entities motor carbon brush device conversion problem, at least in the motor maintenance cycle time of carbon brush structure will not create problems. Above is the content of the bearing to share today, want to learn more bearing small knowledge, pay attention to the bearing's official website.