Electrical pitting Causes and Countermeasures
2020-10-16
  • How:

    1. Grease isolate the O/R、I/R and ball after uniform distribution in the bearing, but under some circumstance electric potential difference would cumulative, the current force to pass O/R and I/R instantaneous when it reach critical value, cause the spark inside the bearing, make the surface of raceway and rolling elements into molten state, it is electrical pitting.
Fretting Corrosion Causes and Countermeasures
2020-09-18
  • Fretting corrosion:

    1. A special wear process that occurs at the contact area between raceways and balls under load or impact and in the presence of repeated relative surface motion load, resulting in lubricant failed (as shown below).
Corrosion cause by varnish and Countermeasures
2020-08-14
  • How

    1. When heat and RH are high, the bearing would rust after grease absorb corrosion gas that varnish volatilization inside the motor.
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