Electric Motor Bearings
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Electric
motor bearings are usually deep groove radial, angular contact ball and
cartridge bearings. These have enhanced internal tolerances, lubrication,
seals and shields ensuring limited vibration and noise. They may have
contact or non-contact seals or shields.
Electrical motor bearings are used with power frequency converters. This
helps resist electrical erosion under normal operating conditions and high
temperatures. The motor bearings are highly loaded moving components with
metal-to-metal contact. They form the most critical parts pertaining to high
reliability and low service costs.
Frequency converters cause electrical erosion-related bearing damage in
standard all-steel bearings. Smaller motors are prone to damage as they are
fitted with standard not having protection against electrical. Electrical
motor bearings need to be electrically insulated or have polymeric
insulation layers that provide such protection. Hybrid bearings are the most
viable solution.
The basic necessities of electric motor bearings are:
- Emergency running capability at very high temperatures
- Shutdown and restart capability
- Long service life at normal motor temperatures
- Satisfactory performance in cold climates
- Quiet operation · Re-lubrication options
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