Acceptable motor choice?

O

Ordenrahl

Joined
Oct 16, 2015
Messages
37
After reading some posts and asking a few questions I purchased a Oregon blademaker grinder.

At this point I'm looking for a 1.5 -2hp motor and VFD. I understand the best choice for a VFD is the KBAC-27D for $365 (plus another couple hundred for a motor). I'm ok with purchasing a non-NEMA 4 vfd cheaper and having it crap out after a year or so. I've also read here some people set them up and of the side and have had pretty good luck with them.


Here is what I've found, 1.5hp. 1800 rpm. TEFC motor with VFD for $270
http://dealerselectric.com/1-and-half-HP-1800-RPM-230-Volts-Input-Package.asp#productTabs1

It does need 230v electric which is bit of a bummer but I can wire that for the garage. I'm not familiar with the frame type though? NEMA 145T. It looks like it can be bolted down but everyone here likes C-type frames

My plan is to bolt this to my bench and purchase a corresponding drive wheel from Oregon blademaker

Do you think this will work? Is there another motor that you would recommend in this price range? I'd prefer 110v if it's out there.

Thanks,

J..
 
Ordenrahl said:
At this point I'm looking for a 1.5 -2hp motor and VFD. I understand the best choice for a VFD is the KBAC-27D for $365 (plus another couple hundred for a motor). I'm ok with purchasing a non-NEMA 4 vfd cheaper and having it crap out after a year or so. I've also read here some people set them up and of the side and have had pretty good luck with them.

J..
Click to expand...

The "crap out after a year" part makes little or no sense to me. What makes you think this is a realistic scenario?

The experience of those I know personally has been that either you have a drive that is protected against dust and it will last pretty much indefinitely, or you have an unprotected drive and it will die the moment the power electronics first come into contact with metallic dust. Failure is not a progressive or time-related thing in this case.

VFDs have cooling fans and they switch large currents very fast. The fans mean that if there is any dust in the air, it will be drawn to the drive by the fan. The large switching currents generate magnetic fields which will tend to attract any metallic particles in the passing air to the power electronics part of the drive. Basically, there are are at least 2 mechanisms at work to concentrate any airborne metallic particles where they will do most harm.

The VFD in the link is to IP20. IP is Ingress Protection and the first digit denotes protection against solids. 2 means protected against solids of 12.5 mm and larger and is effectively fingerproof. For a grinder, you usually need at least IP5x (dust protected), preferably IP6x (dust tight).

http://www.dsmt.com/resources/ip-rating-chart/

Alternatives to buying an IP6x VFD include mounting an IP20 VFD in a separate clean area and using a remote control box or enclosing an IP20 VFD in an IP66 enclosure.

If the kit you have only needs a foot-mount motor, and you do not already have a drive wheel bored to suit a 56-frame motor (which has a 5/8" shaft IIRC), the motor should be fine. You will need a drive wheel bored 7/8 to suit the 145T motor in the link. Face-mount motors are used on some grinders, but not the Oregon, as far as i can tell from a google image search.
 
I'll second the recommendation for an ironhorse. They make a decent quality 3 phase motor that you can get brand new for about $150 to $175 or so. As for the VFD, you're not likely to find a "cheap" VFD that will run on a 110vac input. In that regard, the KB drive will be your better option.

Otherwise, the huanyang VFDs are actually pretty decent and versatile if you keep them clean, and they'll only set you back about $100, not including any additional wiring or components for external controls. pretty much all of the 1.5hp and larger open frame VFDs will run on 220vac as far as I know.
 
Thank you for the posts. If I go with the 2 hp iron horse motor and a KB drive, can I wire the VFD with 110 and the VFD turn it into 230v for the motor?
 
Ordenrahl said:
Thank you for the posts. If I go with the 2 hp iron horse motor and a KB drive, can I wire the VFD with 110 and the VFD turn it into 230v for the motor?
Click to expand...

The KBAC will only up to 1.5hp on 110VAC. If you want to run 2hp, you'll need to wire for 220VAC.
 
You must log in or register to reply here.
Back
Top