Search found 146 matches

by coleasterling
Apr 20 2019 1:22am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 171
Views: 13220

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Posted this on the Facebook group. Finally got some time to work on the board again. I think I finished beefing up the high voltage path, but am open to input. Plates are around 1mm thick. Maybe more beef on the top side closer to the caps?
by coleasterling
Apr 08 2019 2:52pm
Forum: E-Bike General Discussion
Topic: surron bicycle with qs205 middrive
Replies: 19
Views: 903

Re: surron bicycle with qs205 middrive

Okay, that super cool...But I'm confused. Did you buy a surron and disassemble or were you able to buy the frame alone, or what?
by coleasterling
Apr 01 2019 10:14am
Forum: Motor Technology
Topic: No Valid Forward Hall Combinations
Replies: 4
Views: 135

Re: No Valid Forward Hall Combinations

Interesting, I never considered timing to be an issue with a controller's ability to spin the motor. I've had several motors with pretty advanced timing and no major issues before now. Regardless, thanks for the lead on the reverse function! It took a little probing, but I found it and got it to wor...
by coleasterling
Mar 31 2019 12:41am
Forum: Motor Technology
Topic: No Valid Forward Hall Combinations
Replies: 4
Views: 135

No Valid Forward Hall Combinations

Here's a fun one. Controller works fine on another motor, motor works fine on another controller. I have three valid reverse hall/phase combos, but no forward. From a valid reverse combo, I swapped two phase wires and then went through the hall combinations. There is one that slightly spins, but it ...
by coleasterling
Sep 17 2018 11:06am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 171
Views: 13220

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

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.
by coleasterling
Sep 14 2018 12:47pm
Forum: Electric Watercraft
Topic: Simple Outboard Conversion
Replies: 2
Views: 884

Simple Outboard Conversion

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...
by coleasterling
Aug 21 2018 4:34pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 43
Views: 3541

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

Is that assuming you've entered the field weakening region? I wouldn't think it would be an issue until then?
by coleasterling
Aug 21 2018 12:02pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 43
Views: 3541

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

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...
by coleasterling
Aug 20 2018 10:51am
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 43
Views: 3541

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

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...
by coleasterling
Aug 20 2018 10:47am
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 43
Views: 3541

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

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...
by coleasterling
Aug 17 2018 11:55am
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 43
Views: 3541

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

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...
by coleasterling
Aug 16 2018 11:18am
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 43
Views: 3541

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

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...
by coleasterling
Aug 15 2018 11:46am
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 43
Views: 3541

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

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?
by coleasterling
Aug 14 2018 10:47am
Forum: E-Bike Build Threads / Photos & Video
Topic: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science
Replies: 43
Views: 3541

Re: Toyota Prius A/C Compressor Motorbike: The Bike of IPM Motor Science

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?
by coleasterling
Jul 25 2018 12:36pm
Forum: Items for Sale - Used
Topic: Panosonic 25ah Prismatic cells for sale $28
Replies: 70
Views: 5148

Re: Panosonic 25ah Prismatic cells for sale $22

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...
by coleasterling
Jun 21 2018 12:13pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 171
Views: 13220

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

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.
by coleasterling
Jun 20 2018 12:30pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 171
Views: 13220

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

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.
by coleasterling
Jun 02 2018 11:26am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 171
Views: 13220

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

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,...
by coleasterling
Jun 01 2018 6:01pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 171
Views: 13220

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

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...
by coleasterling
Jun 01 2018 3:57pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 171
Views: 13220

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

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?
by coleasterling
May 30 2018 9:00am
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 171
Views: 13220

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

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.
by coleasterling
May 29 2018 8:53pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 171
Views: 13220

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Received my inverter components and board today. Can't wait to assemble it!
by coleasterling
May 21 2018 2:50pm
Forum: Motor Technology
Topic: Power PCB for Lebowski Controller to be combined with Bobc's processor board
Replies: 171
Views: 13220

Re: Power PCB for Lebowski Controller to be combined with Bobc's processor board

Got my brain board in today. Thanks guys!!
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by coleasterling
May 21 2018 2:29pm
Forum: Items for Sale - New
Topic: Sur-Ron Light Bee USA group buy
Replies: 206
Views: 25378

Re: Sur-Ron Light Bee USA group buy

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