Which 3 HP motor for KMG?

Troop

Troop

Joined
Oct 26, 2006
Messages
2,898
Hey Guys,
Does anybody know of a 3 HP sealed motor, 220 volt, single phase, that will work fantastic with a KMG? I don't know what to look for as far as RPMs go; I don't want to get one that's going to start throwing belts. I'd like to get one that doesn't require too much of a modification, or elaborate set-up, to hook up to the KMG.
- Thanks.
P.S. I don't have the KMG yet; I want to order the whole shi-bang all at once.
 
I also indeed would LOVE to know. I am also getting the KMG(Thanks Mitch!) and would very much like to skip the 2HP upgrade and go with a 3HP.
 
I do not have a kmg but if you go to their sight I think they tell you what type 2hp motor they provide. Then just order the same frame and face in a 3hp.

Chuck
 
Actually, it's pretty easy. Since the motor is not an integral part of the grinder, you have a ton of choices and just about anything can work with little to no extra effort.

Ideally you'll want to spin the drive shaft on the KMG about 3500-4000 rpm on the top speed. This is a good roughing speed where you'll need all the torque from the 3 hp motor.

Do you want to slow it down for more delicate finishing work. Do you want variable speed? Or is this a dedicated, single speed hoggin' monster?

If it is just for hoggin, then a single groove plley set will work. If you find a 3450 rpm motor...use a 1:1 pulley ratio from to the grinder. Say, 3" pulley on the motor and a 3" pulley on the grinder for example. If you use a 1725 rpm motor, then use a 2:1 ratio: 6" on the motor and a 3" on the grinder.

In 3hp, you'll probably use a 145 or 184 frame size in a 1725 rpm version. In 3450rpm, you can probably find it in the smaller 56 frame. A 184 frame is a big honkin' motor and will probably weigh about 80lbs.

Of course, buy a "Totally Enclosed" motor...and not an "open Frame" or "drip Proof".

There really isn't a single answer for your questions since you have so many choices that will work fantastic on the KMG. Don't hesitate to drop me a line will questions, I'll be glad to help.

-Rob
 
Hi Rob,
I cannot thank you enough for your reply. I'm looking to do everything with this thing, but I'm not saavy with regards to setting anything up with a variable speed control or anything. If you can tell me exactly which parts to order, I will definitely do it. Also, if you are able, please pick a motor that would do me good, also.
Thanks again, brother.
- Mitch
 
I've looked at the Baldor site, and I spotted this one, their model #L3606T
http://www.baldor.com/products/spec...e&hp=3.0&winding=36WG0201&rating=40C+AMB-CONT
It's a single phase, Totally Enclosed Fan Cooled, that runs at 3450 RPMs. But, I'm more than a little confused when it says on the specs sheet that the voltage is 115/230. I have a 220 line coming into my laundry room. Will a 230 rating work on a 220 line? Also, it says "usable at 208 volts : 15". What the heck does that mean??? It's frame size is 182T. I don't know what that means, either. :o
Please tell me what I'm looking at with this thing. Then, I need belts and pulleys (and blinker fluid and muffler bearings! :D)
- Thanks
 
First off, if you want variable speed you probably want to consider a three phase 220 volt motor so that you can use a VFD controller. Rob sells them, but I don't think he has them for 3 hp.

If you don't want variable speed the 115/230 means that the motor can be wired to run at either voltage. Since you have 220, that's what you'll want to use. 220 will work with a 230 rating (though there may be a little power loss).

The frame number indicates the size and shape of the mounting plate, including the size and position of the holes in it. If you're going to be building your own mount it probably doesn't matter much because you build to fit. If you're going to buy a pre-drilled steel plate from Rob you'll need the frame size he drills it for (56 as I recall).
 
Can't go wrong with Baldor or Leeson! As per specific model I aint got doodley squat to tell ya!!!! :D
 
dlpierson said:
First off, if you want variable speed you probably want to consider a three phase 220 volt motor so that you can use a VFD controller. Rob sells them, but I don't think he has them for 3 hp.

If you don't want variable speed the 115/230 means that the motor can be wired to run at either voltage. Since you have 220, that's what you'll want to use. 220 will work with a 230 rating (though there may be a little power loss).

The frame number indicates the size and shape of the mounting plate, including the size and position of the holes in it. If you're going to be building your own mount it probably doesn't matter much because you build to fit. If you're going to buy a pre-drilled steel plate from Rob you'll need the frame size he drills it for (56 as I recall).
Click to expand...
Can I use a three-phase motor even though I only have a 220 single-phase line in my basement?
-Thanks again.
 
Troop, if you get the proper vfd you can run a 3 phase motor with a single phase line, you'll need to get a bigger vfd though.
 
The $64,000.00 question: Which one? It looks like, due to my lack of knowledge in these matters, that I need someone (hopefully) to say to me, "Order this part #, this part, and these parts as well, and it'll work."
If someone could do this, I would more than greatly appreciate it.
Thanks, guys.
- Mitch
 
I got my motor and VFD from these guys: http://www.dealerselectric.com/. It's working fine so far but it's not going to last forever because I didn't know enough to get a NEMA 4 enclosure. Most of the drives (VFDs) that dealers sells are NEMA 1.

The difference is that NEMA 4 is made to work in an environment with conductive dust in the air...

I'd really try to get Rob's advice on this one.
 
Mitch, if you want to shop locally Middletown Electric Motor is a good source. New motors , repairs , info.
 
dlpierson said:
I got my motor and VFD from these guys: http://www.dealerselectric.com/. It's working fine so far but it's not going to last forever because I didn't know enough to get a NEMA 4 enclosure. Most of the drives (VFDs) that dealers sells are NEMA 1.

The difference is that NEMA 4 is made to work in an environment with conductive dust in the air...

I'd really try to get Rob's advice on this one.
Click to expand...

Thanks, Dan. I guess Rob is still at work. (Darn...and I'm just going in soon for my last midnight shift!)
 
mete said:
Mitch, if you want to shop locally Middletown Electric Motor is a good source. New motors , repairs , info.
Click to expand...

Thanks, Robert. Any idea what street in M-Town? I'm going right up that way tomorrow to pick my kids up for the weekend.
 
Mitch, Unable to find listing of Middletown Electric Motors ????? Maybe they're gone !!
 
Hi Troop,
I wanted variable speed on my KMG so I went with a reconditioned Allen Bradley variable frequency drive unit. Thank god I got variable speed, I don't think I could live without it.

My son designs conveyor systems, and he told me that used 3 phase motors are easy to find and very cheap. So I found a NEW 2 HP Baldor on eBay and it has worked fine. Note, if you will be full time, or use every day, you will need a motor rated for VFD use. My 2 HP is very, very strong, I can't see how I would have needed 3 HP. The motor is going strong for 2 plus years now.

I made a wooden enclosure with filters to protect the VFD from the metal dust. Also note, when using the VFD unit on 220v single phase ( like most all of us have in our homes ) the unit should be rated higher ( use 3HP unit for 2HP motor ), or check with the Mfg to be sure. Good luck, you will fall in love with the KMG!
 
You must log in or register to reply here.
Back
Top