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Discussion Starter · #3 ·
Yep. It's hard to tell about all the way around 360 degrees, but definitely every place i stop hand turning has continuity all the way around. The buffer didn't have a regular contractor it had more of a "soft start" mechanism to energize the motor. I think the 2 small white wires have something to do with it. I may need to search for a wiring diagram in the tenant B7.
 

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Discussion Starter · #7 ·
No spark when touched. Tried it with 24v and 52v. I don't know what those little white wires are either. I actually have 2 of these motors. They are from floor burnishers with dead batteries (according to previous owner). I'll check out the other one. I may try attaching 36v to the other one while it's still installed on the buffer.
 

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Discussion Starter · #10 ·
Well now I feel silly. My old jumper cables are apparently broken somewhere in there. I used a different set of cables and sparks flew and the shaft spun like a champ.
Sorry I washed your time.
Now to the spec label.
It says 24-72v and 104 amps continuous duty. Do you think it will pull more current in bursts? I wonder because it says 8.8hp (max) which is about 72v at 104 amps. I'm trying to figure out which controller would work well but I dont want to spend more than necessary for an overkill controller. It's for a little tractor conversion.
 

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Discussion Starter · #14 ·
Ya I suppose that just because it looks like an me0709 and it's made for 24-72v, it doesn't mean that it is an me0709. I don't want to go overboard on the controller but I also don't want to limit the motor by the controller.
 

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Discussion Starter · #22 ·
The motor constant can be approximately determined by applying various voltages (or even just one) and observing the resulting no-load speed. If KV is the same as an ME0709 then KT will be, too (KT is just the inverse of KV, in appropriate units of measure).
Oh I didn't know that. Thanks for the info.
 

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Discussion Starter · #23 ·
Oops... clicked the wrong link! Sorry. But the idea is the same - just find anyone listing more useful specs. Even the Motenergy page lists "300 amps peak (1 minute) and 125 amps continuous", which may be enough information.
Ya. I'm just not sure that what I have is in fact an me0709. I was just guessing it may be because it looks similar and the tag says 24-72v. Lol. All I really know is that it's the motor from a Tennant B7 floor burnisher. I have 2 of them and a bunch of other parts are on there. A 24v transaxle for one thing. I'm trying to think off something to use those for. There's also a pretty powerful linear actuator on there that I'm going to pull before I scrap the machines. Who knows what else I can scrounge up.
 

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Discussion Starter · #26 ·
If you wanted to be in that ballpark, why did you buy a 9hp motor?

Run the motor at its max continuous nameplate of 9hp and gear down appropriately. You're not running the pto, everything is towed, should be fine.

Use BOTH...
Well I bought it because it was cheap and I'll likely do just as you say. I guess I don't need a controller over 200a then.
 

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Discussion Starter · #28 ·

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Discussion Starter · #31 ·
Looks good to me, assuming you want regen and are happy with the voltage range. Is there any chance you will run the thing at a higher voltage in the future ? I think that motor won't be upset with 100V.
Hmm. I don't know. I picked 72v because I have a 40s Chevy volt battery left over from a solar storage project. Gives me 7.7 kwh as 20s2p battery. I could switch it to just a single 24s battery but then I'd only have 4.6 kwh with reduced run time. Actually hadn't even considered it. Maybe I should.
 

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Discussion Starter · #33 ·
Ya I figured I'd only charge to 4v for longevity. Still that's 80v but I figured the motor would be fine since most specs seem to revolve around lead acid voltage which would be 14.4 x 6 = 86.4 fully charged. I will need to check into the controller max voltage Thanks
 
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