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How are the bearings insulated?

wallpapers Industry 2020-10-26
 
The shaft voltage generated during the operation of the motor is a serious equipment hazard, and the shaft current formed by the shaft voltage seriously threatens the safe operation of the equipment.
Shaft voltage and closed circuit are necessary conditions for the formation of shaft current. Shaft voltage occurs during the operation of the motor, including the potential difference between the two ends of the shaft, part of the shaft, and the shaft to ground. The direct attack object of the shaft voltage is the bearing system. When the voltage reaches a certain value, the lubricating oil film in the bearing will be broken down, forming a closed circuit, that is, shaft current is generated. Low voltage and large current are one of the characteristics of shaft current. Due to the effect of shaft current, it will cause heating problems , The bearing grease is degraded and failed due to high temperature, and the bearing is in a state of intermittent dry grinding, resulting in the burning of the bearing itself and even the sintering adhesion between the bearing and the shaft, and finally the bearing falling apart and burning, that is, shaft current corrosion.
The solution to prevent shaft current corrosion is to use insulated bearings in the motor to cut off the current loop. That is, the bearing is insulated. So how is the bearing insulated?
If you want the bearing to have insulation performance, you can use the plasma spraying process on the inner or outer ring of the bearing according to the ordinary bearing standard to evenly spray the aluminum oxide coating on the bearing ring. The aluminum oxide has good insulation Performance, so that the bearing can have an insulating effect. After further sealing treatment, the bearing can also be protected from humidity and moisture.
The minimum resistance of the alumina coating is 200 megohms, which can withstand a DC voltage of up to 3000V. After the bearing is insulated, it can improve the reliability of the equipment operation by actually eliminating the shaft current problem, and increase the uptime of the equipment. It is used in the motor Can guarantee more reliable operation!

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Tag: bearings   insulated