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2.10 Insulated Bearings In general the non drive end bearing is insulated. If the motor is operating on a frequency converter the insulation of the non drive end bearing is a must, because of the existing bearing currents. The bearing insulation has to be checked after replacement of bearings 3. Common Bearing Problems
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Specify a motor with an insulated non-drive-end (NDE) bearing assembly. Potential grounding paths through connections to the shaft system must be taken into account, and the bearing insulation must not be by-passed. This includes shaft mounted auxiliaries which may need an insulated coupling. Supply Voltage
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The purpose of insulated bearing for Motors with VFD drives or the Alternators is to prevent the flow of circulating current in a closed circuit through bearing and ground (if bearing is not insulated) and consequently prevent the bearing from damage. This circulating current is caused by induced voltage in the shaft because of AC flux.
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Induction motors and pulse modulation motors can produce electrical pitting or ribbing on bearing raceways, hence insulated bearing options may want to be considered. Coupling with gears or belts. The type of motor connection will produce load on the motors bearings.
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Current Insulated Bearings When a stray current in an electric motor uses a bearing as its path to ground, bearing damage can occur. The electric current passing can cause micro cratering in the raceways of inner & outer rings and on the rolling element surface which ultimately changes the structure of the metal.
Insulated sleeve bearings are purchased with the outer diameter insulated by the bearing manufacturer. Insulated bearings are provided as standard on the following TITAN® products: All 6-pole motors; Vertical motors 5800 frame and larger; Horizontal motors 6800 frame and larger; Motors for inverter duty applications; Sleeve bearing motors
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Insulated bearings. Insulated bearings eliminate the path to ground through the bearing for current to flow. However, installing insulated bearings does not eliminate the shaft voltage, which will still find the lowest impedance path to ground. This can potentially cause a problem if the path happens to be through the driven load or through ...
particular in motors with a small number of pairs of poles. In this case, it is sufficient to interrupt the flow of current by insulating one of the two bearings. In general, the bearing on the non-driven side is insulated. A=bearing1 B=bearing2 Figure1 Induced voltage along a shaft A B 00017267
Additionally, BMI is capable of manufacturing cylindrical & taper roller bearing as well with electric insulation. Typical Application: Traction motor of railway vehicles; Electric motors ( AC/DC ) Generators ( wind power ) For any other details on current insulated bearings or other technical queries feel free to reach our team on sales ...