Motor and VFD

Joined
Feb 14, 2019
Messages
24
I am sure this has been asked a million times but I could not find the answer I was looking for .

My garage does not have a 220v outlet only 120v's.

1. So that being said are there 3 phase 56c TEFC motors I can use with a 120v outlet?

2. What is the cheapest (even a Chinese knockoff) I can get away with? Please include some links?

3. When I look at ebay for VFDs there are dozens. What VFD (cheap) will work? And it will need to be 120v as well. Links?

Thanks in advance guys. I am so excited to be on this Blade Making journey.
 
It's not the motor that determines 120 vac use, but the VFD. The VFD will take the single phase 120 vac (or 240 vac) and change it to 3 ph 240 vac to run the motor. I did see a Chinese VFD that would run on 120 vac input but it was really expensive. It seems that all of the "cheap" Chinese drives require 220 vac input. The KBAC drives will take 120 vac input, but say they are limited to 1-1/2 hp motors. From the manual:

"KBAC-24D, 27D, 29 (1P): Designed to accept 1-phase (Terminals L1, L2) AC Line input only. Rated for 208/230 Volt AC Line input with Jumper J1 set to the "230V" position (factory setting). Rated for 115 Volt AC Line input with Jumper J1 set to the "115V" position. KBAC-27D is rated for 1½ HP maximum with 115 Volt AC Line input and 2 HP maximum with 208/230 Volt AC Line input."
 
Would I be better off just getting a single phase and an on off button since the garage only has 120v in it?
 
Plus 1 for the above post.
Don't despair, the 1.5HP of the 120VAC setup works just fine. I used a 1.5HP Bader with speed control on 120VAC for ten years, and never had an issue. If you get 220VAC later, just change the cord plug and switch the jumper to 230V.
 
Would I be better off just getting a single phase and an on off button since the garage only has 120v in it?
As the folks above said, NO!!!!! VFD is the ONLY "reasonable" way to go. 110 vac is just fine - only issue for me would be requiring use of the expensive KBAC drives. They are good drives, just expensive for an old cheapskate like me. I've only been called "Diamond Jim" in jest.
 
It's not the motor that determines 120 vac use, but the VFD. The VFD will take the single phase 120 vac (or 240 vac) and change it to 3 ph 240 vac to run the motor. I did see a Chinese VFD that would run on 120 vac input but it was really expensive. It seems that all of the "cheap" Chinese drives require 220 vac input. The KBAC drives will take 120 vac input, but say they are limited to 1-1/2 hp motors. From the manual:

"KBAC-24D, 27D, 29 (1P): Designed to accept 1-phase (Terminals L1, L2) AC Line input only. Rated for 208/230 Volt AC Line input with Jumper J1 set to the "230V" position (factory setting). Rated for 115 Volt AC Line input with Jumper J1 set to the "115V" position. KBAC-27D is rated for 1½ HP maximum with 115 Volt AC Line input and 2 HP maximum with 208/230 Volt AC Line input."

Ken H, thank you for the explanatin. Could you please comfirm my understanding. I want to ensure I don’t buy the wrong stuff.

With a KBAC-27D i woulld need a 3 phase motor, not 1 phase, correct? I’m sorry I know zilch about electric motors. The one I have currently on my KMG grinder, is a 1phase, 2hp.

And I could use 3 phase, 2hp motor at 230vac. Also the motor could be a 1750 or so rpm, and if I remember correctly I read somewhere that you could use a jumper in the drive to double the speed, and get better torque at lower rpm, but still,fast enough. Is my understanding correct?

Thanks in advance,
Constantin
 
Correct on all counts

And one more question please, after browsing KB’s website.

If I decide to go with a 3hp motor, would the KBAC-29(1p) be the choice?
I have a 220vac line.

Thanks again,
Constantin
 
If you buy from OBM, the whole setup is prewired, plug and play. It's easy to figure out yourself but even easier to just plug and play.
 
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