Quieting down cyclone dust collector

[ryanjg117]

I own a Clear Vue CV1800 dust collector with the 5hp single-phase Leeson motor. I'm looking for some options to quiet it down. It seems many opt to house this in its own room (sound dampened) or build a sarcophagus for the filter stack. I was thinking about two ideas:

1. Change the motor to a 3-phase, 3hp drive I happen to have sitting around, and purchase a variable frequency drive to give me the ability to control the speed (and sound) of the cyclone. I realize this will result in less peak HP, but I've never been wanting for more suction here (in fact the thing is an absolute tornado) and I know Oneida sells a lot of cyclone units of similar design with 3hp motors like their well regarded V-3000. My ducting is all 6" S&D pipe through the shop. Here's the motor I happen to have collecting dust:

View attachment 1

Interestingly, even thought it's just 3hp, it's quite a bit fatter than the Leeson 5hp single-phase motor atop the cyclone now. I'm guessing it's probably not the right frame size and I'll have to make some modifications to the cyclone motor mount and maybe fab some custom brackets/adapters, but that doesn't concern me much. I know there are a lot of benefits to 3-phase motors, for example they are not susceptible to diminished longevity when powered on for just short periods of time (I believe Clearvue states you shouldn't run the DC any less than five minutes at a time).

2. Shorted the 90 degree sweep that the Wynn filters hang on, and add a silencer. Oneida makes an 18” stacking silencer that reportedly reduces the sound by 8db at 10 feet. I'll have to fab a shorter filter transition piece and maybe mount the cyclone higher to buy me enough space to stack the silencer on top of the filters, but it can be done.

EDIT: Just noticed my 3-phase motor is only rated for about half the RPM as the Clear Vue, so the motor swap might not be an option.

 

[Mini Me]

The original Leeson multi voltage 3 phase motor was banned from production  about 10 years ago by the US government and the new one is a lot bigger as you have found. Putting a 3 phase motor on it makes the CV and any dust collector/cyclone far more flexible in its use, I run my 1800 at 70hz during the day and 40 at night. It also gives you unlimited starts unlike single phase which limits starts per hour so I am told. Every CV in Australia uses 3 phase power as our grid only runs at 50hz on single phase. Have a look here at the Muffler fitted to their Max.
https://mastslav.weebly.com/

 

[ryanjg117]

Have a look here at the Muffler fitted to their Max.
https://mastslav.weebly.com/

Why was the 3-phase motor banned? Random guess: was it related to nuclear centrifuges?

I'm loving this big boy muffler. My only question: I'm outputting to the Wynn filter stack. How would a massive upright muffler like this work in between the cyclone and filter stack? Could I have the inlet for the filter at the bottom, or does it need the help of gravity to do its thing? My idea:

[attachimg=1]

 

[Mini Me]

Have a look here at the Muffler fitted to their Max.
https://mastslav.weebly.com/

Why was the 3-phase motor banned? Random guess: was it related to nuclear centrifuges?

[attachimg=1]

The reason for that is lost in time or at least to me and I can't recall being told at the time, I know it nearly stopped the business I had just started until I found another motor source outside the US. Due credit to Leeson as they did offer to supply the motors for export only but I did not take up the offer. Why would nuclear centrifuges be the reason because I have absolutely no idea what that is.