Search found 35 matches

by SRFirefox
Feb 21 2020 2:41pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Electric Scooter Conversion - Polish WFM Osa M52
Replies: 23
Views: 1815

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: 23
Views: 1815

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: 48
Views: 7231

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: 439
Views: 73103

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: 439
Views: 73103

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...
by SRFirefox
Feb 11 2020 6:52pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)
Replies: 48
Views: 7231

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

Very cool. Those numbers look pretty darn good too. You could dunk your motor in a tub of water to keep the heat down for the 50A test. 25 to 50C in 3 minutes with some good airflow is some pretty good numbers for general bike usage.
by SRFirefox
Feb 10 2020 1:18am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1309
Views: 140029

Re: Nucular electronics - complete kit for ev! [beta]

I'd like to put my name on the list for a 24F controller and an LCD.
by SRFirefox
Feb 01 2020 1:22pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)
Replies: 48
Views: 7231

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

Which FETs are you using on this board? I'm using the CSD18536KCS. I looked at the wrong datasheet earlier. The minimum turn on threshold is 1.8V http://www.ti.com/product/CSD18536KCS I also want to test with the NCEP60T20. It's a cheap FET that seems like it could work decent enough https://lcsc.c...
by SRFirefox
Jan 14 2020 3:41pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Lambretta University Project
Replies: 8
Views: 1627

Re: Lambretta University Project

Step one is to lose the gearbox. Seriously. It's only going to take up volume and mass, cause headaches, and offer no real benefit over a single-speed reduction from motor to axle. If you can put the shaft of your motor where the transmission outputs to the final drive, you don't even have to worry ...
by SRFirefox
Jan 02 2020 6:14pm
Forum: Motor Technology
Topic: QS 3000w midmotor
Replies: 531
Views: 67381

Re: QS 3000w midmotor

QS is apparently only advertising their new 180 90H motor on this forum . Who knows why. They apparently also have a 180 135H good for 12kW continuous, but no details. QSMOTOR 180 9000W 90H PMSM IPM mid drive motor For a long time, we are developing and testing our new 8000w mid drive motor, below i...
by SRFirefox
Dec 07 2019 2:19pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)
Replies: 48
Views: 7231

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

Good luck on your business trip! I would assemble and test some for you if that meant getting to beta testing faster, but I will settle for drooling over the images of mostly assembled CF2s!

What wattage and size are the 1mOhm current sense resistors?
by SRFirefox
Nov 28 2019 8:20pm
Forum: Motor Technology
Topic: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (v0.9 release! Beta testing still ongoing)
Replies: 48
Views: 7231

Re: Cheap FOCer 2 (Open-source, Low-cost, VESC 6 based ESC) (Prototyped and needs funding)

You've come a long way since the Cheap FOCer 1! Great work! Do you have an expected BOM cost for the CF2? May I ask why 12s? Will it work with 13s without regen? The DRV used for the VESC6 and by extension the CF2 is good to 60V. 10V of buffer at 12S is already giving the DRV a small 16% safety fact...
by SRFirefox
Nov 25 2019 11:40pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 265
Views: 36776

Re: Serious FOCer (84V VESC 6 based controller)

Looking good! Are you using a reflow oven to do assembly?
by SRFirefox
Nov 25 2019 1:44am
Forum: E-Scooter and Motorcycle General Discussion
Topic: New Project " help Please" Honda st1300 Conversion
Replies: 54
Views: 5244

Re: New Project " help Please" Honda st1300 Conversion

The main reason behind for wanting to dismantle the current ICE assembly and not a direct drive. Is to utilise existing gearbox & clutch so I have that extra controllability , rather than just having 1 speed range and brutal braking action when the throttle is backed off. ( as I am not sure how to ...
by SRFirefox
Nov 22 2019 2:27pm
Forum: Battery Technology
Topic: Best Method for Battery Build??? 16s4p Telsa 2170 Cells
Replies: 20
Views: 2435

Re: Best Method for Battery Build TESLA 2170

Can you tell us a little bit more about how you disassembled the individual cells? The adhesive they used on them looks pretty tough. Also, it looks like there's no cell level insulation on the cases, is that right?
by SRFirefox
Nov 15 2019 4:41pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: CRF250 Build
Replies: 24
Views: 2671

Re: CRF250 Build

https://endless-sphere.com/forums/viewtopic.php?f=31&t=65972&start=1200#p1476453 QS is now making the 180 90H for 9000W continuous, which is the replacement for the 8000W mid-drive on their site. I doubt that you'll need that big a motor for a 250cc motorcycle unless you're trying to set the world o...
by SRFirefox
Oct 29 2019 8:08am
Forum: Items Wanted
Topic: QS Mid Motor
Replies: 1
Views: 811

QS Mid Motor

I'm looking for any of the QS mid motors, 1, 2, or 3kW. Preferably with belt drive option, but will consider the chain drive variants. I'm in the continental US.
by SRFirefox
Oct 26 2019 1:24pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1079
Views: 97709

Re: APL's DIY axial-flux motor

If you're still looking, a used computer from business or academic surplus less than 5 years old is all you need for F360 or other cad programs, and they can be had quite inexpensively from various places if you can do the refurbishing yourself (never leave the OS they give you on it). Occasionally ...
by SRFirefox
Oct 25 2019 1:03pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 265
Views: 36776

Re: Serious FOCer (84V VESC 6 based controller)

Check out ST's application note 5225. Section 10.1 describes the bare minimum to convert a USB 2.0 device to use a USB-C connector. In this case, you can simply use Vbus on its four pins as your 5V source, though it's not shown in that diagram. https://www.st.com/resource/en/application_note/dm00536...
by SRFirefox
Oct 25 2019 12:14pm
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 265
Views: 36776

Re: Serious FOCer (84V VESC 6 based controller)

Excellent work! That's pleasantly little debugging to get a motor spinning, let alone under FOC. Looks like all of the design review time with Marcos and the care you took in the design phase is paying dividends. I can't wait to see how this FOCer performs under load! P.S. Are you using a microUSB p...
by SRFirefox
Aug 31 2019 1:42pm
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 580
Views: 106658

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

Looking awesome, Arlo! 225/245 is a good starting compromise for sure, and way bigger than stock. What are you using for batteries?

Keep up the good work, I'm excited to see your first AWD drive!
by SRFirefox
Aug 12 2019 7:59pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1079
Views: 97709

Re: APL's DIY axial-flux motor

It looks like there's enough space for another layer of windings with the 14AWG wire. You could lay another 11 winds over the originals and connect them in parallel on each core. That would give you half the copper losses and maybe allow you to run about twice the power, with the same amount of volt...
by SRFirefox
Jul 20 2019 12:51pm
Forum: Motor Technology
Topic: BESC - beefed up VESC motor controller for high power ebikes
Replies: 146
Views: 25482

Re: BESC - beefed up VESC motor controller for high power ebikes

Hey! Just ordered PCBs and components for 2 units. If I get through debug without any smoke I should have an extra unit. Offtopic: what kind of motor are you using on your ebike? I have a QS205 and I'm wondering at what current it starts to melt. :mrgreen: :mrgreen: I'm looking at the QS series of ...