Low RPM motor question
Low RPM motor question
(OP)
Hi guys, I have what is probably a pretty simple question but I want to make sure I get the right thing. My company has large liquid mixing tanks that are powered by hydraulic motors. I've been asked to make a portable mixing tool that will mount on a 275 gallon tote and be easily removable. I have the mechanical part designed (very simple - just a bracket with a coupler and a shaft with paddles that will go down into the container.), what I need to figure out now is what motor to buy. It will be operating at very low speeds of ~60rpm or less, and the liquid is basically water (minimal viscosity) so I don't anticipate a lot of torque. We'll need the motor to operate for 5 or 6 hours at a time to ensure our batches are adequately mixed. I'd also like to be able to plug it straight into a standard US 110V outlet. Does anyone have any suggestions on what motor I should use? I really appreciate any help or guidance!
Matt
Matt





RE: Low RPM motor question
The other alternative would be a small "universal" AC/DC motor, similar to what is in a drill motor or an appliance. They are inexpensive, but would need regular maintenance (brush replacement), something unlikely to happen on a portable mixer.
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: Low RPM motor question
RE: Low RPM motor question
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: Low RPM motor question
Pick out half a dozen from the Grainger catalog, then go to the store. They won't have any of the catalog units in stock, but they'll have some PSC POS that will work ok at some cost in efficiency.
Mike Halloran
Pembroke Pines, FL, USA
RE: Low RPM motor question
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: Low RPM motor question
I wanted to gently point out that our OP may have underestimated the severity of the bearing situation.
By which I mean that stock gearmotors of all sizes have output shaft bearings that are sized for a modest radial pull from a chain or belt located just a shaft diameter or two from the distal bearing, and not much thrust load at all.
Whereas, mixers intended to twirl a propeller at the end of a long-ish shaft in a tub of goo typically have sturdy shafts and housings and bearings, and typically cost a lot more than stock gearmotors.
Therefore, if one is determined to 'save money' by using a stock gearmotor to twirl an unbalanced (or at least unspecified) impeller at the end of a long shaft, it makes sense to use one of the bigger stock gearmotors that can run from the specified power source. It still won't last as long as a real tank mixer motor, but maybe it will last long enough to gather some data.
Mike Halloran
Pembroke Pines, FL, USA
RE: Low RPM motor question
http://www.spx.com/en/lightnin/pd-mp-small-top-ent...
Mike Halloran
Pembroke Pines, FL, USA
RE: Low RPM motor question
http://www.grainger.com/product/DAYTON-AC-Gearmotor-2H610?s_pp=false&picUrl=//static.grainger.com/rp/s/is/image/Grainger/2H610_AS01?$smthumb$