3HP motor for a KMG

[jaymeister99]

Anybody know if this motor will work well on a KMG? Also will this work with a KBAC-29 VFD? I've been trying to use a 1hp for quite some time, its a bit underpowered.

https://www.grainger.com/product/MARATHON-MOTORS-General-Purpose-Motor-53DE15

 

[12345678910]

Direct drive, or belt and pulley ?

It's 3400 rpm
If it's a step pulley setup, that will be too fast.

I'd do a direct drive conversion while you're at it.

Motor would be fine for that.

 

[Stacy E. Apelt - Bladesmith]

56HC is a 56C with a combo foot plate. That info is in the motor link ( click View More). That motor should fit a KMG just fine. As The Count said, direct drive is what you want with a VFD and a big motor. I like 1750 motors, but the VFD will take care of any RPM needs. The KBAC-29 is the right VFD.
Here is a frame info chart;

http://www.rockymountainbaldor.com/wp-content/uploads/2013/04/Cowern-Motor-frame-size.pdf

 

[12345678910]

56HC is a 56C with a combo foot plate. That info is in the motor link ( click View More). That motor should fit a KMG just fine. As The Count said, direct drive is what you want with a VFD and a big motor. I like 1750 motors, but the VFD will take care of any RPM needs. The KBAC-29 is the right VFD.
Here is a frame info chart;

http://www.rockymountainbaldor.com/wp-content/uploads/2013/04/Cowern-Motor-frame-size.pdf

He's right

 

[timgunn1962]

With a 2-pole motor, I'd normally recommend a Sensorless Vector drive, particularly if you use low speeds for sharpening. These will drive the motor smoothly at speeds well below the 10 Hz or thereabouts that tends to be the comfortable minimum for V/Hz drives. The KBDA-29 seems to be a Sensorless Vector drive.

With the KBAC, I'd be more inclined to use a 4-pole motor and run 10 Hz to 120 Hz for a 300-3600 RPM speed range.

With the SV drive (KBDA?), you should be able to run the 2-pole motor between 2 Hz and 60 Hz for a 72-3600 RPM speed range.

It is worth noting the motor is not Inverter Rated (however, it has class F insulation, so will run from a VFD), so this effectively means that it will need derating at low speeds, This might sound like a potential issue, but tends not to be in "our" application: we tend to use light pressure at low speed and that intermittently, so the derate usually happens unconsciously.