Isolating motor vibration- phase converter, What to use?

[ritzblitz]

Hi guys,

I installed a home brew rotary phase converter to power my machinery. I mounted it to a beam in the shop. It's on the outside wall, not outdoors, but outside of the shop area. So the walls and the beam vibrate and it's pretty annoying.

I'm looking to isolate the vibration to the motor. It's mounted directly to pressure treated 2x8. That is mounted to the beam.

I tried a piece of thick carpet which didn't help at all. So, instead of mounting the converter to a different spot in the garage, I figured I'd try to isolate the vibrations from the motor first. 1750rpm 7.5hp 3ph motor with no capacitors yet. It's about 90lbs.

What are good ways to isolate the vibes? I saw rubber washers, sandwiched pads, rubber pads, spring style isolators, etc.

Any and all help is great. Thanks!! I'll add a picture of the setup as well.

 

[toolchaser]

I think having it cantilevered is adding to your vib issue. Mount it flange down to the ceiling with rubber donuts or the machinery mounts that are always on sale @ MSC.
Thats how mines mounted (but on a concrete pad) anything with some mass under the rpc will help dampen harmonics

 

[A_Pmech]

Because of the relative masses of the wooden wall and the motor, you've built a big speaker. The wall is acting as the speaker cone and the motor is acting as the speaker coil.

Remove it from the wall and mount it to the floor and you'll solve the problem. I doubt any level of vibration isolation will cure the noise you hear inside.

 

[ritzblitz]

Well, i know I created a drum. It was kind of stupid, I didn't think about the harmonics as I was building it. I'll find a place on the floor to stick it.