Search found 291 matches

by district9prawn
Aug 04 2020 10:31pm
Forum: E-Bike Technical
Topic: Rewinding BBSHD for 72V?
Replies: 11
Views: 180

Re: Rewinding BBSHD for 72V?

I have seen various chinese motors with 12 stator teeth and 8 magnets (just like bbshd). The winding scheme is usually ABCABC. Coils on the same phase wound in series.
by district9prawn
Aug 03 2020 11:57am
Forum: E-Bike Build Threads / Photos & Video
Topic: Neu 8057 6kW left hand drive hardtail with vesc and encoder
Replies: 66
Views: 12732

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

Finally ditched the cycle analyst! For the past few years it has only been a display and I haven't actually used any of its control functions. Also managed to changed the gauges on one screen to show the D and Q axis currents so I can see what is happening with field weakening. https://possum-tunnel...
by district9prawn
Aug 01 2020 1:41pm
Forum: E-Bike Technical
Topic: Rewinding BBSHD for 72V?
Replies: 11
Views: 180

Re: Rewinding BBSHD for 72V?

Are you trying to lower the kv? The windings should handle 72v as is. Easiest way forward is to simply replicate the existing turn count and wire gauge.
by district9prawn
Jul 31 2020 10:08pm
Forum: E-Bike Technical
Topic: Opinions please: VESC - Vedder Electronic Speed Controllers
Replies: 16
Views: 722

Re: Opinions please: VESC - Vedder Electronic Speed Controllers

Wouldn't 15% faster be even faster than a square wave controller at full speed?
by district9prawn
Jul 30 2020 11:05am
Forum: Motor Technology
Topic: BAC800 vs. Neumotors 8025
Replies: 5
Views: 297

Re: BAC800 vs. Neumotors 8025

So the rpm of 7759 is like some magic value? Regardless of voltage? My experience was that the kv and rpm parameters didn't really affect the controller's ability to spin the motor.
by district9prawn
Jul 07 2020 10:43am
Forum: E-Bike Build Threads / Photos & Video
Topic: Neu 8057 6kW left hand drive hardtail with vesc and encoder
Replies: 66
Views: 12732

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

Another video playing around with 10s and field weakening. Recorded during the day this time :wink:. In the previous video I had 100 or 110A battery limit but I forgot to include field weakening in the calculation so the true limit ended up being more like 150A. I fixed that in the firmware for this...
by district9prawn
Jul 04 2020 10:29am
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 390
Views: 60482

Re: N.E.S.E. the no solder module

That makita pack looks nice!

I have not checked in on this thread for some months now. Great to see so many new projects and improvements.

What good cells are there in the 26650 format?
by district9prawn
Jul 03 2020 12:25pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Neu 8057 6kW left hand drive hardtail with vesc and encoder
Replies: 66
Views: 12732

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

While the hardware on the bike hasn't changed since the my last update, a lot of features have been added to the vesc firmware. Since the firmware now has separate parameters for the d and q axis inductance, I thought I would try use the Ld and Lq for field weakening. The Ld and Lq is used to calcul...
by district9prawn
Jul 03 2020 11:51am
Forum: E-Bike Build Threads / Photos & Video
Topic: Neu 8057 6kW left hand drive hardtail with vesc and encoder
Replies: 66
Views: 12732

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

I intended to use 25h chain and angle grinder reducer gearbox with bewel gears (so it gave nice 90 degree turn and motor could be oriented vertically). An angle grinder gearbox ebike?! That I need to see. I might give 25H chain a try when my current sprocket wears out. The finer pitch would mean I ...
by district9prawn
Jun 26 2020 9:46am
Forum: E-Bike Build Threads / Photos & Video
Topic: DIY Super73 inspired ebike!
Replies: 9
Views: 1026

Re: DIY Super73 inspired ebike!

Ah I love build threads that start with chopping up a perfectly good frame :wink:

Nice work though!
by district9prawn
Jun 26 2020 9:34am
Forum: Stand-up E-scooters and E-skateboards
Topic: E-skateboard motor burned out, what are my options? Can't get spares
Replies: 2
Views: 251

Re: E-skateboard motor burned out, what are my options? Can't get spares

Do you know if the motor is a brushed or brushless type?

If the windings have cooked rewinding the motor is an option especially if you have plenty of spare time.
by district9prawn
May 28 2020 3:05am
Forum: E-Bike Technical
Topic: ASI BAC800 programming over USB-Serial interface - possible to use different cable?
Replies: 1
Views: 84

Re: ASI BAC800 programming over USB-Serial interface - possible to use different cable?

I've had success with various usb to serial boards/cables. As long as they are 5v logic level (which the sabvoton should be) it should be ok. The ftdi usb to serial boards advertised for arduino on ebay are a good source.

A usb isolater is a good idea too, even though not many people bother with it.
by district9prawn
May 24 2020 11:28pm
Forum: Vendor Relations Corner
Topic: E.R.T \ Alan Hu nightmare.
Replies: 24
Views: 1214

Re: E.R.T \ Alan Hu nightmare.

thender wrote:
May 21 2020 10:46pm
He said ASI doesn't allow end consumers of resellers credentials to log into their controllers. Ok, fine, but why are you programming controllers to do this?
Have you got a copy of the ASI pc software? A login is not required to program the controller over the serial interface.
by district9prawn
May 03 2020 4:19am
Forum: E-Bike Non-hub Motor Drives
Topic: Freehub pawls failure? Is this common 3kw+
Replies: 20
Views: 829

Re: Freehub pawls failure? Is this common 3kw+

3. I installed an aftermarket steel freehub body. No bite-in problems anymore! By far the best hub for ebikes. Not the lightest but really durable and maintenance and upgrade friendly. Yes don't forget to buy the steel freehub body with the DT star ratchet hubs. The splines on my steel freehub stil...
by district9prawn
Mar 17 2020 4:58pm
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 57
Views: 3238

Re: True FOC: definition and examples

Note that if you have three wires going to motor windings, due to Kirchoff's Current Law, once you know the current in two of the phases, you automatically know the current in the third. My first hybrid (Honda Civic Hybrid) had only two current sensors for the three phase traction motor for that re...
by district9prawn
Feb 28 2020 8:14am
Forum: Motor Technology
Topic: What's so bad about low impedence?
Replies: 30
Views: 1620

Re: What's so bad about low impedence?

ASI are pretty conservative with their ratings. I ran their bac4000 controller with the 100kv wind of the 8057. Did the auto tune and set up as per the manual and everything worked.
by district9prawn
Feb 27 2020 6:07am
Forum: E-Bike Technical
Topic: Complete bosch performance line cx 2019 removal, need help and advice
Replies: 3
Views: 420

Re: Complete bosch performance line cx 2019 removal, need help and advice

This whole situation has made me tear up and break down more then once, my only option left is to remove everything from the frame and attempt to fit an aftermarket mid-drive setup to the existing mounting holes Unfortunately as you've probably noticed the Bosch motor mounts are non standard and I ...
by district9prawn
Feb 26 2020 7:19am
Forum: Motor Technology
Topic: Serious FOCer (84V VESC 6 based controller)
Replies: 268
Views: 38230

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

One question that's bothering the electronics noob that I am: why do vesc require that powerful drv's ? Is that a design choice ? Originally I think Benjamin wanted to reduce the component count and cost to make it easier for users to solder their own vescs from blank pcbs. The drv isn't a particul...
by district9prawn
Jan 31 2020 8:01am
Forum: Items for Sale - New
Topic: PV NextGen FOC 130v 200/600A 25kw - $599, Watch Display
Replies: 230
Views: 26064

Re: Preorder. PV NextGen FOC 130v 200/600A 25kw - $499

Those are some fine looking boards!

Have you seen the zero speed sensorless HFI (high frequency injection) feature in the latest firmware?
by district9prawn
Jan 09 2020 6:03am
Forum: E-Bike Reviews & Testing
Topic: CA3+PAS with VESC
Replies: 6
Views: 909

Re: CA3+PAS with VESC

On the vesc you will need to configure it for 0% power at 1ms pulse and 100% power at 2ms pulse. By default it might be something like 0% power at 1.5ms, with 1ms and 2ms pulses giving full power in forward and reverse.
by district9prawn
Dec 30 2019 6:08pm
Forum: Polls & Surveys
Topic: When Windows 7 is dead in 2020 what OS will you migrate to??
Replies: 82
Views: 26629

Re: When Windows 7 is dead in 2020 what OS will you migrate to??

I made the switch to Linux this year. Still some games and cad software which need windows. I didn't want to dual boot and didn't like mucking around trying to get them to run well under Linux. I've been running windows in a kvm which seems to give pretty much the same performance as a regular insta...
by district9prawn
Dec 27 2019 5:38pm
Forum: Battery Technology
Topic: potting compound for batteries
Replies: 34
Views: 2283

Re: potting compound for batteries

What I've done on a couple of batteries is just pour epoxy potting compound over the top of the cell holders without any sort of mold. This was over 4 years ago and the batteries have all done fine and it seems it will hold until the cells no longer have useful capacity/IR. The sides of the cells ar...
by district9prawn
Dec 16 2019 6:46pm
Forum: Motor Technology
Topic: Roman Kostrygin - Sur-Ron 16kw outrunner
Replies: 66
Views: 8622

Re: Sur-Ron 16kw outrunner

I'm curious how the no load current looks at higher rpm. The rotor looks quite thin.

Mechanically it looks good though.
by district9prawn
Dec 10 2019 7:27pm
Forum: E-Bike Technical
Topic: Help: Phaserunner Phase Current Troubleshooting
Replies: 16
Views: 1336

Re: Help: Phaserunner Phase Current Troubleshooting

If you try all different phase combinations and the phase runner always gives the same "No current on yellow phase" error then problem should be the controller. If the phase runner detects a shorted phase then it disables the mosfets and refuses to drive the motor. Not the case here. I think your ph...