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Converting single speed Air filter to multi-speed

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Forum topic by Scott C. posted 09-09-2014 03:55 PM 767 views 0 times favorited 5 replies Add to Favorites Watch
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Scott C.

149 posts in 1513 days


09-09-2014 03:55 PM

I’m looking at a used Delta 50-860 for my small shop (12’x22’). This unit is a single speed 850cfm, a bit over kill for my shop but leaves room for growth and the price is right. I don’t know much about the fans in these things, would it damage the motor to add speed control? Assuming I can find one that is appropriate for the electrical load. I’d like to be able to turn it down while I’m working in the shop, but still be able to crank it if I’m cleaning up the shop.

-- measure twice, cut once, swear and start over.


5 replies so far

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TechTeacher04

325 posts in 993 days


#1 posted 09-10-2014 12:05 AM

You did not specify how you would be hooking the dust collector to your tools, direct to tool or connected through interconnected pipes or hoses. I would be leary of adjusting the speed. By connecting the tools in series you will decrease the suction at each tool achieving the lower cfm at each tool. Install bast gates and you can increase the cfm for the clean-up you mentioned.

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Scott C.

149 posts in 1513 days


#2 posted 09-10-2014 12:08 AM

This is an ambient air filter, to supplement my existing dust collector.

-- measure twice, cut once, swear and start over.

View Jim Finn's profile

Jim Finn

2409 posts in 2383 days


#3 posted 09-10-2014 12:32 AM

Your air filtering unit is most likely powered with an induction motor, much like your furnace fan is. You will kill an induction motor with a speed controller. Speed controllers are only for Brushed (Universal) motors not for induction motors. You can install a multi-speed induction motor but will have to choose a speed and stick with it. This is common on furnace fans.

-- "You may have your PHD but I have my GED and my DD 214"

View Scott C.'s profile

Scott C.

149 posts in 1513 days


#4 posted 09-10-2014 01:00 AM

Thanks Jim, that’s exactly what I was looking for.

-- measure twice, cut once, swear and start over.

View rick1955's profile

rick1955

258 posts in 892 days


#5 posted 09-12-2014 01:50 PM

If you switch your motor to a PSC (permanent split capacitor) or shaded-pole single phase induction motors you can get variable speed.
http://www.invertekdrives.com/variable-speed-drives/optidrive-e2-single-phase/
Or switch to a three phace motor and use an inververter. www.factorymation.com
Or switch to a DC motor. www.surpluscenter.com

-- Working smarter with less tools is a true crafts person...

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