Search found 300 matches

by district9prawn
Sep 11 2020 9:22am
Forum: Items Wanted
Topic: Asi bac login credentials
Replies: 14
Views: 254

Re: Asi bac login credentials

Have you tried using the pc software? It does not require a login.
by district9prawn
Sep 10 2020 4:51am
Forum: Motor Technology
Topic: New ground-up ESC - MESC_FOC_ESC
Replies: 24
Views: 992

Re: New ground-up ESC - MESC_FOC_ESC

Hey congrats on getting a motor spinning from scratch! Your project seems like a great way for people to learn motor about motor control. Arguably easier to get into than the available dev kits made for that very purpose.
by district9prawn
Aug 26 2020 8:01am
Forum: Items for Sale - New
Topic: N.E.S.E. the no solder module
Replies: 415
Views: 64474

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

Do you reckon your 26650 modules would work with 26800 if the print was scaled?
by district9prawn
Aug 22 2020 8:53am
Forum: E-Bike Technical
Topic: Help! Cyclone 1680 Gearbox Fail
Replies: 9
Views: 165

Re: Help! Cyclone 1680 Gearbox Fail

I spoke with technician, and he sad that cause of failure -is broken bearing. Because of it, a heavy load on the gears began I haven't seen your broken gearbox up close but the bearings in planetary gearboxes should be very reliably since the forces are balanced. Is your controller very rough and j...
by district9prawn
Aug 20 2020 5:33am
Forum: E-Bike Build Threads / Photos & Video
Topic: Neu 8057 6kW left hand drive hardtail with vesc and encoder
Replies: 69
Views: 13795

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? The field weakening current is calculated based on motor parameters. I think their strategy was to adjust Id to try and maintain modulation at the maximum. I did use their way of adding a...
by district9prawn
Aug 15 2020 4:05am
Forum: E-Bike Build Threads / Photos & Video
Topic: Neu 8057 6kW left hand drive hardtail with vesc and encoder
Replies: 69
Views: 13795

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

Tweaked the fw a bit so that Iq decreases smoothly and there isn't that odd surge in power at high speed. Motor power and voltage are now more constant in the field weakening region.

Image

Image
by district9prawn
Aug 13 2020 1:22am
Forum: E-Bike Technical
Topic: Anything New In The VESC Area?
Replies: 2
Views: 117

Re: Anything New In The VESC Area?

BESC really does seem like the closest thing to what you are after. I had a look at the github and it looks pretty good, just some small fixes that need to be added.

Going over 100v will always add to cost.
by district9prawn
Aug 07 2020 1:10pm
Forum: Motor Technology
Topic: Surron Motor tuning with datalogs! FOC experts needed
Replies: 11
Views: 641

Re: Surron Motor tuning with datalogs! FOC experts needed

The point in the curve where battery current suddenly drops off and motor voltage sharply increases, corresponds to a spike in Id. But it's POSITIVE! It looks like field weakening is going wrong.
by district9prawn
Aug 06 2020 10:32pm
Forum: E-Bike Technical
Topic: Phase lag, power factor and efficiency in a Bafang G310 / Baserunner system.
Replies: 8
Views: 274

Re: Phase lag, power factor and efficiency in a Bafang G310 / Baserunner system.

Your understanding seems to be correct. For our EVs we don't tend to look at it in terms of power factor, but in terms of motor back emf. In case 2, on the other hand, going up a steep hill, I am wondering if the load becomes more resistive and the current lag becomes less, bringing the power factor...
by district9prawn
Aug 04 2020 10:31pm
Forum: E-Bike Technical
Topic: Rewinding BBSHD for 72V?
Replies: 12
Views: 402

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: 69
Views: 13795

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://i.imgur.com/q...
by district9prawn
Aug 01 2020 1:41pm
Forum: E-Bike Technical
Topic: Rewinding BBSHD for 72V?
Replies: 12
Views: 402

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: 18
Views: 867

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: 414

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: 69
Views: 13795

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: 415
Views: 64474

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: 69
Views: 13795

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, Lq, Iq and winding resi...
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: 69
Views: 13795

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: 1237

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: 509

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: 104

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: 27
Views: 1683

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: 902

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: 3560

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: 1758

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.