Compared to small motors, the bearing system of large motors is more complex. It doesn't make much sense to discuss motor bearings in isolation; the discussion should include related components such as the shaft, bearing sleeve, end covers, and inner and outer bearing covers. The cooperation with related components is not just a mechanical fit but should also consider external factors such as the operating conditions of the motor.
In the actual operation and use of motors, one of the most common issues is bearing noise. This problem may be related to the quality of the bearings themselves on one hand, and on the other hand, it is related to the selection of bearings. Most of these issues stem from inappropriate or irrational production processes, leading to bearing problems.
We know that noise originates from vibration. To solve the bearing noise problem, the primary issue to address is vibration. Compared to small and ordinary motors, large-scale motors, high-voltage motors, and frequency-controlled speed motors also face the issue of shaft current. To address this issue, one can use insulating bearings, but the procurement cost of these bearings is relatively high, and some insulating bearings are not widely available. Another approach is to use grounding brushes, but this method is more troublesome to maintain. In light of this situation, many motor manufacturers have come up with the idea of using insulating bearing sleeves, which are complex to process. The basic principle is to divide the bearing sleeve into two parts, isolating the bearing chamber part through insulation, thus completely cutting off the circuit caused by shaft voltage leading to shaft current, which is a one-time solution.
This type of insulating bearing sleeve can be divided into an inner sleeve and an outer sleeve, with an insulating filler between them, with a thickness of 2-4mm. The insulating bearing sleeve, through the insulating filler, separates the inner and outer sleeves, blocking the shaft current and thus protecting the bearings and extending their service life.
Post time: Oct-30-2024