![]() When, depends on either the lifespan of the bearings (L 10h) or on the lifespan of the grease that is used as lubrication (F 10h). Greased-for-life bearings or maintenance-free bearings have to be replaced eventually. They do not imply that the bearings do not need maintenance at all. Some bearings are referred to as greased-for-life bearings or maintenance free bearings. Only about 1% of all rolling bearings reach expected life. Therefore, when carrying out preventive maintenance on the motor, replacement and maintenance of bearings are indeed important factors!! Causes of failure in rolling bearings. The most common error is no longer short circuit but noise from the bearings and bearing damage. The reason is that the insulation system is no longer subject to high temperatures because the efficiency of motors has improved over the years. Today, bearings are the components in the motor that are most exposed to wear. The major causes of motor failure, according to the Electrical Research Association, USA ![]() ![]() That is a short-circuit between the phases or between the phases and the frame. Usually, induction motors are capable of handling overvoltage situations. However, severe overvoltage may cause turn-to- turn, phase-to-phase or phase-to-ground short circuiting. At lower voltages, motors run at a reduced full-load efficiency, run hotter, have a larger slip, produce less torque, and may have a shorter lifespan. ![]()
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