Anti-electric erosion grounding device for variable frequency motor bearings

Abstract

The anti-electric corrosion grounding device of the frequency conversion motor bearing comprises a U-shaped cylinder body, wherein a through hole is arranged at the bottom of the U-shaped cylinder body; A step shaft is arrange in that inner part of the U-shape cylinder, the small end of the step shaft protrudes from the through hole, and the step surface is in contact with the bottom of the U-shaped cylinder; The head of the small end is provided with a ball limiting sleeve, a steel ball is arranged between the ball limiting sleeve and the small end, and a steel ball part is exposed from the outlet of the ball limiting sleeve; The top of the U-shaped cylinder body is provided with an adjusting pressure head connected with the U-shaped cylinder body through a screw thread, and a spring is arranged between the adjusting pressure head and the stepped shaft; The U-shaped cylinder body is fixed on the planar base through an arch-shaped pressing piece screwed with the planar base; the U-shaped cylinder body is fixed on the planar base through an arch-shaped pressing piece screwed with the planar base. The planar base is also provided with bolt mounting holes for fixing the planar base tothe end cover. The invention has the advantages of good anti-electric corrosion effect, small abrasion, no need for frequent replacement and long service life. At that same time, the invention has the advantage of simple structure, simple installation and high economy.

Description

technical field [0001] The invention relates to the field of variable frequency motors, in particular to a grounding device for preventing electrical corrosion of bearings of variable frequency motors. Background technique [0002] Galvanic corrosion is the loss of material from contact surfaces due to the passage of electrical current. When the voltage is too large, when the current is passed from one ring of the bearing to the other ring through the rolling elements and lubricating oil film, a breakdown discharge will occur in the contact area due to improper or poor insulation. [0003] When the motor is running, the potential difference between the two ends of the rotating shaft or between the shaft and the bearing is called the shaft voltage. If the two ends of the shaft form a loop through the motor base, etc., the shaft current will be generated. Shaft current is generated by the shaft voltage through the motor shaft, bearing, stator frame or auxiliary device to form...

AI Technical Summary

Problems solved by technology

Although the grounding carbon brush is cheap and has good anti-corrosion effect, due to its material characteristics, the grounding carbon brush wears quickly and has a short service life. The effect of electric conduction and heat conduction will be significantly reduced, and the effect of anti-corrosion will also become worse.

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