Electric Motors/What kind of motor do I need for this?
I'm hoping you can give me some direction here.
I need a reversible, variable speed motor that will turn a platform about 20" across with an up to 400 lb load on it at about 2-8 RPM.
I have no idea if I'm describing a big or small motor, direct drive, belted, with transmission or what. Would need to plug into a regular 110 outlet.
Much obliged for any suggestions.
Happy New Year,
Mike actually I will be designing and building something very close to that in the near future, a guy wants a rotating device for his commercial pizza oven,
I know this much so far, I will use a variable frequency drive that also converts single phase power to three phase power, that way I have motor starting, reversing, ramping speeds, 46 or more parameters in one box commercial off the shelf,
Then I will use a three phase motor, much cheaper less expensive and complicated in some sort of low output rpm gearbox, then the drive would vary the speed by changing frequency
That way I can hold torque,
So I run 110 right off a normal 15 or 20 amp 115 circuit no big deal,
The box or VFD is commercially available it depends on how he or YOU build the table to determine down or up thrust load, he is using like two matched thrust bearings but his pizza table is much larger than 20 inches more like 72
So if he builds the table so there is little added friction to overcome the smaller the drive the smaller the motor and it would be a gear motor, right now we are thinking 1/3 hp because of the centrifugal or flywheel effect once I get it up and rolling,
Gear motor to table, all kinds of options, regular belts, variable speed sheaves, plastic belting, direct drive gear to gear drive, he is thinking a pulley on the lower shaft and mounting the drive to the side,
The VFD can be run remotely or from the keypad, and it comes in a NEMA one enclosure so it takes care of a lot of parts motor starter enclosure, overloads,. plus infinite speed and torque control,
I would suggest you look up VFDS that change single to three phase, so much less fussing and if you want variable speed it is absolute, get away from single phase motors,
when you get down to 2 RPM it is more in the gearing or sheaving than the gearbox, the lower output speed of a gearbox the more expensive some are even double planetary and those are big bucks,
I am looking at a drive that will run around $300 the gearbox I hope I can find a new used surplus for less than $500 then some wiring and sheaves and whartever types of belts they have so many non rubber belts and sheaves to pick from you might look at power train options too,
I like the belted option simple is better, even adustable sheaves to get the final out RPM so slow,
We run one of our lathes at about 6 or 7 RPM by using a drive just like this and tying into the lathe chuck drive, then we use the auto feed attach the welding torch to the carraige set up the distance type of wire, gas and weld up 9 inch shafts and no one needs to do anything but set it up,
So I know it works very well,
In your case you say platform so I assume it is a horizontal surface, now with the weight you need a good thrust bearing setup which any bearing house can give you plenty of brochures and ideas, but yes very doable,
But you are doing the most difficult, the lower speeds are always difficult to hold the torque at that low of an rpm, but still doable, and fairly cheaply using new surplus gearboxes is the way to go, a new drive always and the drives have everything electrical you need to worry with in one box, wire in 115 out comes 220 three phase which is easy to control with frequency but you want the base speed as low as you can get it, so if you can find a gearbox with a low low output say 20 RPM then all the motor has to be reduced by is very little which helps with cooling and lots of other things,
my home email is email@example.com, write me there and it will be easier than trying to go back and forth through allexperts nothing against all experts great great service but not many are going to be doing this, so if you can send me sketchs or whatever I can feed you ideas but you need to be worrying with this table, and the 400 down load on whatever bearing setup, first, and what is the ambient conditions?
The pizza oven I will put the electrical behind a firewall or heat wall so only the belt is driving in the oven, some sort of steel belting I am guessing at this point,
let me know some particulars and a drawing, rough is fine,