AC Frequency Drive Motors

Tom Militano

Tom Militano

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Feb 27, 1999
Messages
1,160
How does a 2hp, 230V, 1800 rpm, single phase, frequency drive motor stock up next to a 1 1/2hp, 180V, single phase motor with heat sink and controller? The ac motor setup runs $385.00 and the dc setup is over $550. Thanks.
Tom
 
You can do much better price wise on a DC setup than that one. Of course I don't know what type frame the motor is either but still higher than you should have to go.
 
Tom, the ac variable frequency drive units only work with 3 phase motors. With these units the VFD is expensive, but the motors are relatively cheap. Be careful though, the ac variable frequency drive unit must be rated higher than the HP of the motor. If you plan to run this motor hard, it must be rated for VFD use. People on this forum have been able to get DC drive units rather cheap. Roger may know a lot about this.
 
My VFD was 300.00 I think
it's rated at 2 hp
I run my mill and my s/grinder
but one at a time.
I am making a disk grinder also with an ac 3 phaze motor
that will run from it also.
I like it too because you can turn your rpm's down (vs) with it
on all the motors hooked to it,
and the torque stays pretty good.
a 1 hp 3 phaze motor I think runs about $89.00 new :D

edited to change becauce of a brain cramp..:(
3phaze AC not DC
 
Hi Tom,

I have three complete set-ups from that company...2 two h.p. vfd/3-phase motor combos and 1 one h.p. set-up. They are hands down better than any D.C. drive set-up I've used, barring the $10K+ units I worked on doing industrial electronics years ago. If you can afford it, I'd say you cannot go wrong...they will even sell you a set-up with a 56C frame for an additional $50 if you need to direct couple.

For making a variable speed grinder on a budget, Check out the recent post by Dan:

http://www.bladeforums.com/forums/showthread.php?s=&threadid=281333


I've also got 6 set-ups similar to this in my shop (4 horizontal discs and two buffers) and they are pretty nice for the money, but low end torque is definitely an issue compared to the VFDs...

Also, I'm happy to say that Rob Frink is now carrying VFD set-ups...I think he just recently started carrying them...you might want to check out his site...support our own whenever possible! :)

-Darren
 
All the old timers seem to favor the ac motors. I understand why but have no experience with them myself. If you would like help in locating a good DC drive I will be happy to keep an eye out for you.

RL
 
Originally posted by Graymaker
My VFD was 300.00 I think
it's rated at 2 hp
I run my mill and my s/grinder
but one at a time.
I am making a disk grinder also with an ac 3 phaze motor
that will run from it also.
I like it too because you can turn your rpm's down (vs) with it
on all the motors hooked to it,
and the torque stays pretty good.
a 1 hp 3 phaze motor I think runs about $89.00 new :D
Click to expand...

edited to change becauce of a brain cramp..:(
3phaze AC not DC
 
Tom, several knifemakers have purchased the Dealers Electric setup, and all have been happy.
You will get somewhat better torque from it than the DC setup. On the down side, it is harder to hook up, and setup than the DC unit.
 
Tom, I bought my VFD on Ebay. I was not so smart about the drives and so forth and I ended up with having to spend another $75.00 for the control pad. The drive cost was about $200.00. Mine is an Allen Bradely rated for 3HP and was new as stated on Ebay, but it was not complete. It was easy to set up. It is very nice to be able to buy and use cheap industrial 220v 3phase motors. I'm just finally getting up and running, as I stupidly tried to run my 2x42 grinder with the 2HP motor. It ripped the pulley off the small shaft! It's KMG time!
 
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