Endless Sphere

I'm just tooling away slowly on mine. It'll probably be another month before I'm finished, but I am making progress! Nothing exciting to share yet, though.

Hey Guys! First electric project I've finished (or at least come close to finishing) in awhile. Motor is an ME0709, 1:1 chain drive to the original lower unit shaft with the original splined coupler from the gas power head's crank. It will eventually be running at ~100V nominal and 70-80A, with perf...

Is that assuming you've entered the field weakening region? I wouldn't think it would be an issue until then?

Very interesting! My somewhat uninformed thoughts on the lookup table were much more simple. Instead of commanding D & Q currents directly, the table would consist of load (throttle),rpm, and timing advance, with the assumption that timing advance is the real-world manifestation of D-axis current. S...

Regarding the text of the testing the sum of the amps going into the motor stayed the same at 180A (is that right?, it looks a bit more?) , but the torque increased from about 35Nm to 58Nm somewhere in the middle by just shifting the angle. Yep, pretty much. I believe the test was done at 180A. One...

I see, good to know that a standard RC controller can at least spin it. Do you work at a junkyard or something? Do you still have the Tahoe compressor? Did you ever open it up? If not, you should, and post some pics!! :D Ha, no junkyard (unless you count my scrap pile!). I own a company that does t...

Heres a cool blog article on some stall testing a friend of mine did. http://build-its-inprogress.blogspot.com/2017/11/stall-torque-test-stand.html Also, what IPMs have you driven sensorless, and with what controller? If I make some electric boat or something and don't want to make my own controlle...

Thanks for the response! I missed that you're actually running field weakening somehow, sorry. Reading back through, a Kv of 40 is pretty reasonable. Of course field weakening is extensively used in any commercial application of IPM's, which makes perfect sense. Pushing the torque knee out by runnin...

Have you been able to figure out a thermal limit? Looks like there's not much advantage to going with higher voltage due to the already high rpm's, just means more gearing. How long could it do double or even triple the current you're using now at, say, 30% duty?

This is awesome. You said 6kW peak...How'd you come up with that number? Thermal measurements? Any idea what the peak RPM capability is...Like can you tell if there are significant rotor losses past a certain point?

You clearly have CNC capability of some sort, but if you wanted to have someone else do it, I own and run a full CNC shop in College Station and would be interested in quoting your parts. I like your solution for these cells, overall. Looked at using them several times myself, but the form factor is...

Good info, thanks guys! I'm going to go ahead and put my brain on top. I want as thin of a package as I can get. I started cutting the second copper plate yesterday and will hopefully have it soldered this weekend. Should be rock and roll after that with the other components.

I'm a little confused. Why are we paralleling resistors instead of just buying single resistors in the power rating we need?


Also, I haven't seen an answer yet as to whether it is a bad idea to mount my brain board on the top, rather than the bottom, yet.

Thanks! If I end up ordering more of these, I may have the plates waterjet. Don't really lend themselves to milling very well. I just cut this one out with the bandsaw (hence the irregularity). Do you think I'll have any issues with mounting the brain on top? Heat maybe? I already soldered the pins,...

I made the slightest bit of progress today, feels good! Please excuse the hackish nature and poor soldering. The extra plate is a little over 1MM thick, with a cross sectional area of 13mm^2 or so. Should be good enough? I hope I got it soldered well. I tinned the board, then tinned both sides of th...

Is there any reason we can't mount the brain board on top of the controller instead of below, as long as there is clearance?

I'm sure you guys will get to assembly before I do, but I'm happy to mill something and send it out. I don't have time to design it, but can throw it in the machine queue no problem.

Received my inverter components and board today. Can't wait to assemble it!

Got my brain board in today. Thanks guys!!

I'd sell them if they got to a point where they could provide them with 17 digit VINs and EPA and DOT compliance.

bionicon wrote: ↑

May 01 2018 12:29pm

This is the one with the pear controller:https://www.facebook.com/photo.php?fbid ... ater&ifg=1

Yep, that's it! Thanks!

I'm not sure on that one. I'll see if I can find it again, as it was on Facebook and I'm terrible at navigating that site.

I know someone has gotten one in-hand, as I've seen it on their supermoto build thread. Must be a beta tester or the like.

It was weeks ago for me.