How to reduce the three phase induction motor bearing noise?

1, three phase induction motor running noise, you can try to add lubricant in the bearing some chemical additives, can reduce the bearing noise, a noise reduction additive with a low noise grease, bearing noise can be changed from the original Based on the lower 3.9 ~ 9.2dB, suitable for use in miniature or small bearings.

2, the use of vibration or vibration isolation device to reduce the bearing noise or isolation bearing noise, can get good results, but this often cost a lot of money, and sometimes institutions to larger, worse cooling conditions, or easy to rust, when used Fully considered, this method should only be used after other measures have been taken to achieve the low noise level of the three phase induction motor bearings. The simplest examples are radial ball bearings that withstand thrust at high speeds instead of thrust bearings, plastic jackets that can be fitted over their outer rings with a rust-absorbing lubricant, thrust bearings with housings or general thrust bearings, In the case of the inner hole or the outer circle with the same plastic sleeve, but the control is not rotating with the adjacent parts friction or interference. This method has a certain silencing effect.

3, in the three phase induction motor bearings and seat hole by adding a middle sleeve, the damping system can be transmitted to the vibration transmitted to the bearing, but this requires deployment is appropriate, otherwise there may be the opposite effect. A further example is the use of acoustically sound-absorbing enclosures to noise-dampened bearing systems completely enclosed or as close as possible. The interior of the noise reduction cover is made of glass fiber or polyurethane foam, and the inner surface is a steel plate with a thickness of 0.6 to 1 mm. The surface of the noise reduction cover is uniformly distributed with small through holes of φ1.2 to 1.5 mm, and the total area of the small holes is about the whole Surface of 25% to 30%, the outer surface of the thickness of 2mm steel. Here, fiberglass or foam is used to eliminate higher frequency noise. Inner surfaces with small holes are used to eliminate lower frequency noise while thick steel outer plates are used to isolate noise.

4, change the speed of the host part of the corresponding method of rolling bearing noise is not very sensitive to the load, but the speed is very sensitive, under conditions permitting, with reduced speed and torque to achieve the same purpose, but reduced three phase induction motor bearings noise.

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