Search found 55 matches

by SRFirefox
Sep 17 2020 10:45pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 482
Views: 114130

Re: Axiom: a 100kW+ motor controller

Have you had any beta testers successfully integrate an Axiom board with unique inverter electronics? I've been messing with some hybrid vehicle inverters and getting my feet wet with Axiom for the price of the control board and some time learning to interface it to a Prius seems like a good and fun...
by SRFirefox
Sep 17 2020 4:43pm
Forum: Motor Technology
Topic: Yasa/Makani controller teardown
Replies: 16
Views: 1198

Re: Yasa/Makani controller teardown

Serious piece of kit there. I'd be interested to see what an Axiom with 1200V switches could do with it - last I read the control board isolation was good for 800V bus. Are the spinning cases integrated into the motor or is there a shaft behind them? The example motor you linked is an in-runner that...
by SRFirefox
Aug 29 2020 1:15pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1370
Views: 122956

Re: APL's DIY axial-flux motor

Congrats! I look forward to seeing it mounted on a bike! :D
by SRFirefox
Aug 24 2020 8:57pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Converting Derbi Senda to electric
Replies: 30
Views: 3469

Re: Converting Derbi Senda to electric

It could be for a magnet on a shaft or wheel to do revolution counting. If you connected it to the phase output and it wasn't up to the voltage it may have broken that particular sensor. Measure the point with a multimeter when it's not connected to anything. If it's at logic high it probably has a ...
by SRFirefox
Aug 20 2020 7:10pm
Forum: Battery Technology
Topic: Open source BMS for 48V to 400V lithium-ion battery pack
Replies: 236
Views: 40118

Re: ENNOID-BMS for 48V to 400V lithium-ion battery pack

This is a very cool project, and I have some ideas that this will be perfect for. In the short term, the SS looks like just the ticket for my smaller e-bike projects. Does the ENNOID-BMS-SS work without enabling or installing the main MOSFET/Contactor? I have a project right now that could use a goo...
by SRFirefox
Aug 20 2020 1:59am
Forum: E-Bike Build Threads / Photos & Video
Topic: Neu 8057 6kW left hand drive hardtail with vesc and encoder
Replies: 70
Views: 14812

Re: Neu 8057 6kW left hand drive hardtail with vesc and encoder

Very cool! Is the field weakening firmware based on the Power Designs experimental branch of the VESC firmware?
by SRFirefox
Aug 17 2020 10:22pm
Forum: Large EV General Discussion
Topic: Small electric car self build
Replies: 10
Views: 2752

Re: Small electric car self build

The QS 138 70H is a popular choice and those who use it say it's very torquey. As torque is a product of current, any appropriate controller that runs on 48V should be able to max out its torque potential just fine. It will just run at a proportionately lower power/rpm than at it's rated 72V. The sp...
by SRFirefox
Aug 11 2020 6:18pm
Forum: Motor Technology
Topic: VESC based +200A powerstage with 200V MOSFETs (videos of it in action)
Replies: 56
Views: 5110

Re: VESC based +200A powerstage with 200V MOSFETs (videos of it in action)

The silicone pad really surprised me, I did not expect it to perform as well as the tape due to how much thicker it is. I've been thinking about this on and off and after a little digging, found a thermal conductivity figure for Kapton of .12W/m*K. Inexpensive thermal pad I've seen around has a con...
by SRFirefox
Aug 01 2020 1:36am
Forum: E-Scooter and Motorcycle General Discussion
Topic: What is the optimum build for a long range light motorbike/ebike?
Replies: 18
Views: 1217

Re: What is the optimum buid for a long range light motorbike/ebike?

I am not quite convinced that air drag can affect the distance so much considering everything else remained the same. Believe it. If you don't believe me, ask around with some of the folks with higher speed bikes how many Wh it takes to go a kilometer at different speeds. Air resistance above a sho...
by SRFirefox
Jul 31 2020 10:14pm
Forum: E-Bike Technical
Topic: Opinions please: VESC - Vedder Electronic Speed Controllers
Replies: 18
Views: 942

Re: Opinions please: VESC - Vedder Electronic Speed Controllers

Foc is slower than in bldc mode with square waves and that’s normal but never been a problem for me but u can chose the bldc mode as well But the TI boards are also running FOC. Some more info: 14 V - VESC Isupply = 0.51 A, TI Isupply = 0.63 A 32 V - VESC Isupply = 0.75 A, TI Isupply = 0.89 A I've ...
by SRFirefox
Jul 31 2020 10:09pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: What is the optimum build for a long range light motorbike/ebike?
Replies: 18
Views: 1217

Re: What is the optimum buid for a long range light motorbike/ebike?

You need to be below 25 Wh/km, and you'll be burning at least three times that much to hold a steady 60 km/h. Wouldn't I travel faster as well when I burn quicker the battery? Let's say if a 10Kwh battery is burnt 25Wh/km to achieve 400kms at 30km/h, wouldn't it be possible to burn at 50Wh/km at 60...
by SRFirefox
Jul 31 2020 7:40pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 482
Views: 114130

Re: Axiom: a 100kW+ motor controller

Out of curiosity, how does Axiom get the cold plates specified for operation? quick answer... we know the power dissipation and where that power is dissipated. we know the capability of the cold plate to reject heat when fluid has a certain flow rate and temperature. and poof.. just like that. That...
by SRFirefox
Jul 29 2020 10:42pm
Forum: Motor Technology
Topic: Axiom: a 100kW+ motor controller
Replies: 482
Views: 114130

Re: Axiom: a 100kW+ motor controller

Out of curiosity, how does Axiom get the cold plates specified for operation? This is one of the obvious (to me) advantages of buying a pre-built Axiom, but I can think of other uses of the manufacturer's cold plates as well.
by SRFirefox
Jul 23 2020 6:24pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)
Replies: 55
Views: 9731

Re: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)

So I've had a couple DRVs fail (not unexpected with my messing around), but I seem to be having the issue that when I reach 40ish amps phase @50% duty that my DRVs throw faults. As in all the faults. My test motor is a mid-monster that I'm running as a self-contained dyno to test the Cheap FOCers to...
by SRFirefox
Jul 17 2020 6:11am
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)
Replies: 55
Views: 9731

Re: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)

Thanks for the offer, Amberwolf, but unfortunately the meter would be cheaper than a trip to meet you. Much appreciated!
by SRFirefox
Jul 16 2020 1:49pm
Forum: E-Bike General Discussion
Topic: Astro Flight motor on cargo bike
Replies: 5
Views: 259

Re: Astro Flight motor on cargo bike

If you want an American made motor, check out the Neu 8057 based builds on Endless Sphere. They spin slowly enough to work with a single stage reduction and can put out lots of power. Neu is also offering 120 and 180 size motors as well.
by SRFirefox
Jul 16 2020 1:28pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)
Replies: 55
Views: 9731

Re: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)

I tried it at 50kHz, but it didn't appear to affect motor heating at all. I suspect that the resistance and inductance measurements are probably not accurate, but I don't have the test equipment to measure these outside of the VESC software. One of these days I'll get a DE-5000 LCR meter, but today ...
by SRFirefox
Jul 07 2020 11:28pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)
Replies: 55
Views: 9731

Re: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)

Bought my first batch and freshly assembled these FOCers. With some moving and life, a bunch of stuff has gone missing, but I found some old Leopard boating inrunners I pulled out of some junked boats a while ago. My first thought was that they're too low inductance and I shouldn't bother, but hey, ...
by SRFirefox
Jun 16 2020 8:56pm
Forum: Motor Technology
Topic: VESC based +200A powerstage with 200V MOSFETs (videos of it in action)
Replies: 56
Views: 5110

Re: I designed a +200A powerstage with 200V MOSFETs

I was curious what the junction temps of your tests were, so I did my best to back them out of the datasheet and your numbers. Figured I'd share since I'd already done the work. Based on your comments about runaway, they're unsurprisingly above 100C. The numbers for the single layer of kapton and al...
by SRFirefox
Jun 15 2020 5:48pm
Forum: Motor Technology
Topic: VESC based +200A powerstage with 200V MOSFETs (videos of it in action)
Replies: 56
Views: 5110

Re: I designed a +200A powerstage with 200V MOSFETs

Thanks for sharing, I've learned a great deal reading your posts about inverter and gate driver design, and I'm hoping to try out what I've learned from you for myself in the near future. It's really cool to see your bus and thermal layout considerations, and a great learning experience for a baby E...
by SRFirefox
Feb 21 2020 2:41pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Scooter Conversion - Polish WFM Osa M52
Replies: 24
Views: 2277

Re: Electric Scooter Conversion - Polish WFM Osa M52

The speedo is unfortunately driven from the rear wheel, so that has to go. I am not sure I understood your bit about nucular - is that a typo? My worry is that I oversize the engine and it's absolutely rapid to the point it's too fast - this is meant to be a cruiser with maybe a better acceleration...
by SRFirefox
Feb 19 2020 7:02pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Scooter Conversion - Polish WFM Osa M52
Replies: 24
Views: 2277

Re: Electric Scooter Conversion - Polish WFM Osa M52

Thanks! What is the typical solution people do with regards to speedos? I do not want to go with the digital one, is there an analog equivalent that takes hall sensor reading, but still has an old school needle? Ideally I'd convert the original speedo to use a new mechanism, but maintain the old lo...
by SRFirefox
Feb 19 2020 3:31pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)
Replies: 55
Views: 9731

Re: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped. Materials have arrived for a test batch)

Somewhere in Vedder's testing videos he has pictures of a turnigy outrunner testing underwater. Distilled and deionized water is inexpensive from the grocery store, so it wouldn't be difficult to swap out water. And as Marcos pointed out, it's not terribly conductive anyway. Best way to remove the w...
by SRFirefox
Feb 17 2020 6:43pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki GSX-R e899 K2
Replies: 459
Views: 82993

Re: Suzuki GSX-R e899 K2

My best answer is I don't know. Arlo has mentioned some lightweight race cells in his CRX build thread. But if you have a set of batteries on hand that you can run the motor on, even if it's a much lower voltage than you want, you can get some good data from running as-is. 1.5 milliohms per cell may...
by SRFirefox
Feb 13 2020 4:27pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki GSX-R e899 K2
Replies: 459
Views: 82993

Re: Suzuki GSX-R e899 K2

Once you know the no-load current draw at low and high RPM, this can be refined for eddy and hysteresis torques, and of course it assumes no field-weakening (is your motor IPM?), but something for you to mess around a bit with for your bike. I assumed 196 cells charged to 4.1V @ 5Ah and guessed at a...