Search found 249 matches

by vedder
Dec 23 2015 9:13pm
Forum: Stand-up E-scooters and E-skateboards
Topic: VESC - NRF implementation losing connection
Replies: 5
Views: 731

Re: VESC - NRF implementation losing connection

The best thing I can suggest is to try to make some space. You can take the antenna apart or use a smaller antenna. You can also remove the sma connector from the PCB and solder a small antenna cable with a smaller 2.4ghz antenna directly to the pcb.
by vedder
Dec 23 2015 7:52pm
Forum: Stand-up E-scooters and E-skateboards
Topic: VESC - NRF implementation losing connection
Replies: 5
Views: 731

Re: VESC - NRF implementation losing connection

Are you using a receiver with PA such as this one? http://www.ebay.com/itm/1PCS-NRF24L01-PA-LNA-SMA-Antenna-Wireless-Transceiver-communication-module-2-4G-/221920817637?hash=item33ab82f1e5:g:~D0AAOSw5VFWKapJ They have been working perfectly for me, but the receivers without the amplifier and just th...
by vedder
Dec 19 2015 6:10pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Vedder's Nunchuk RF
Replies: 22
Views: 3328

Re: Vedder's Nunchuk RF

can it connect to 2 receivers? using one joystick to control 2 skates? like 1tx-2rx connection? Im trying to build a handheld controller for my electric inline skates and I need one joystick to control both feet together. would be possible to add this feature? :oops: That should be possible with so...
by vedder
Dec 19 2015 6:09pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Motor reaching 90°C, go 10S?
Replies: 25
Views: 2240

Re: Motor reaching 90°C, go 10S?

and just increasing the gear ratio and going 10s would have no effect? If you go 10s AND increase the gear ratio it will help. Increasing the gear ration is what will make the difference. If you are going to use the VESC I recommend keeping the 170kv motor, changing the gear ratio and increasing th...
by vedder
Dec 15 2015 7:55am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

This thread is getting kind of long and there is information all over the internet about the VESC, so I just set up a forum for it:

http://vedder.se/forums/

I hope this makes it easier to get support from me and the community. Let me know if you think this was a bad idea :-)
by vedder
Dec 14 2015 6:03am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

Congrats on the first FOC release Benjamin! I just tried FW 2.3 (on 4.7 HW), together with the no-name 44x85mm, 980 kv, ironless 2-pole inrunner that came with a car I got recently. Detection worked well, in integrate comm mode it needs a bit more start-up boost (.07) to get started smoothly (Int. ...
by vedder
Dec 10 2015 5:34pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

also some odd issue where motor won't spin unless I power off the board and power it back on (doesn't seem to be nunchuck related as it is still connected - solid blue light).
I think this is solved in FW 2.4 that I pushed just now.
by vedder
Dec 10 2015 1:51am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

Nice to see that so many people have tried the FOC implementation already :-) Stupid question maybe: do we have to put commutation mode back to "integrate" after detection and before "write config" in the BLDC tab? Or should it stay in "delay" mode? This does not matter since FOC works in a complete...
by vedder
Dec 08 2015 5:48pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

FOC SUPPORT! I just pushed the first FOC implementation to github with a quite massive commit: https://github.com/vedderb/bldc/commit/ff090fd4e0028f6a8ceb28f5441c1d0cca40af7e This is a screenshot of the FOC configuration page in BLDC Tool: http://home.vedder.se/public/bldc_tool/BLDC_TOOL_FOC_Tab.pn...
by vedder
Dec 01 2015 3:09am
Forum: Stand-up E-scooters and E-skateboards
Topic: VESC configuration and brake button SK3 6374-192kv
Replies: 5
Views: 1665

Re: VESC configuration and brake button SK3 6374-192kv

Hallo! 1. How to make brake button work? My throttle is usuing @ADC and works perfect, no issues here. As I understand button is a @PPM app, its connected to 3 pins. Button has 2 wires that has 0 or 1 resistance depending on it state, checked it with voltmeter BLDC tool doesnt "detect" button in @P...
by vedder
Nov 25 2015 1:02am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

Haha, awesome Benjamin, thanks for the correction! :) What were your thoughts on 3 shunt design VESC again? Is this something you are considering, or is the performance gain not worth the redesign effort? I think the three shunt design is worth it for difficult motors such as RC motors. The softwar...
by vedder
Nov 24 2015 8:14am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

Thanks for your explanation Benjamin! This stuff is all very interesting, and makes me want to have a better understanding of how it all works. For anyone interested, Rolf Zimmermann explained the following on RCGroups with respect to motor properties and FOC: Low R and/or low L are absolutely not ...
by vedder
Nov 24 2015 3:39am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

Regarding capacitors: I haven't really measured and compared different configurations to determine how many capacitors are actually needed, but in general it is better to have more (the downside is that you get a larger spark, but that's what anti-spark switches are for). Having more capacitors will...
by vedder
Nov 15 2015 11:09am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

hello Vedder which problems do you mean? Firmware problems or Hardware problems? What max eRPM would be possible in Firmware? How do you calculate the eRPM? Increase the Minimum ERPM from the default of 150 to something like 800. You calculate the ERPM with kv * voltage * (motor poles / 2). The pro...
by vedder
Nov 15 2015 8:46am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

I'm still working hard on FOC and made more progress this weekend, but I haven't pushed the code to github just yet. The more I work on it, the more things to fix I find. I hope I will have the first implementation ready to push soon with firmware 2.0. The ESC is for a RC Boat with 8s at 2500kv with...
by vedder
Nov 13 2015 6:05am
Forum: Stand-up E-scooters and E-skateboards
Topic: hubmotor pros/cons
Replies: 31
Views: 2860

Re: hubmotor pros/cons

eddy currents flow through any conductor near a magnetic field but they produce more loses in the stator The biggest obstacle or source of inefficiency in a hub motor, I think, comes from the stator being saturated with flux due to its size not being up to the challenge of the load and it's low kv....
by vedder
Nov 13 2015 5:56am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

Outrunner with 1200kv Inrunner 4 Poles with 2500kv I must say 1200 Kv for Outrunner and 2500 Kv for an inrunner is very high, not useful for eboards. I am assuming you have other applications with the VESC you want to test... I think these motors should work, but you have to adjust the detection pa...
by vedder
Nov 11 2015 8:58am
Forum: Stand-up E-scooters and E-skateboards
Topic: hubmotor pros/cons
Replies: 31
Views: 2860

Re: hubmotor pros/cons

Now talking again only about pure hubs without gearing systems. Hills will of course generate the same load on both high Kv and low Kv motors with same amount of copper. Then if we say that both motors have systems designed to run identical power at identical RPM, one being 50Kv and the other 100kv...
by vedder
Nov 10 2015 2:25pm
Forum: Stand-up E-scooters and E-skateboards
Topic: hubmotor pros/cons
Replies: 31
Views: 2860

Re: hubmotor pros/cons

With hubs you must think think new! Design properly your powertrain and you can take everything. Think low Kv and high voltage. LEVer's hubs are already a wonderful application based on Turnigy SK3 149Kv. Imagine what he could offer with even better motors and lower Kv. Even ultra steep hills will ...
by vedder
Nov 10 2015 6:42am
Forum: Stand-up E-scooters and E-skateboards
Topic: hubmotor pros/cons
Replies: 31
Views: 2860

Re: hubmotor pros/cons

You said it yourself you can run the same motor with ultra high Kv as long as Amps follow. But you will have so much more heat losses. What is the point in having efficiency if your motor loses all his power in eddy current heat? Wrong. Some formulas: N = turns I = current R = resistance KV = rpm/V...
by vedder
Nov 10 2015 3:00am
Forum: Stand-up E-scooters and E-skateboards
Topic: hubmotor pros/cons
Replies: 31
Views: 2860

Re: hubmotor pros/cons

I don't think I' be able to trust hub motors when carving really hard. Isn't there always a risk of the urethane separating from the hub due to the high axial forces when carving ? No you can get rid of this fear ;) as long as your hubs are properly machined like the ones made by LEVer (Pedig, it i...
by vedder
Nov 06 2015 3:38am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

Wow! That is cool. besides being quieter, are there any performance or efficiency benefits of FOC? I did some light reading on FOC not really knowing the difference and it seems like in the ebike groups they were seeing a solid couple percent improvement in efficiency. better low end power but slig...
by vedder
Nov 05 2015 2:32pm
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

Here is a video of the first FOC implementation. Enjoy :-)

by vedder
Nov 05 2015 7:18am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10S custom skate ESC: testers wanted!
Replies: 1520
Views: 205148

Re: 10S custom skate ESC: testers wanted!

boisrondevens wrote:Thanks for the respond Vedder.
now your telling me that i can use a 6 phases motor with two controller?
also if a rewire a 3 phase motor that should work too right?
Yes, that should work (unless I misunderstand what a 6 phase motor is).
by vedder
Nov 05 2015 7:15am
Forum: Stand-up E-scooters and E-skateboards
Topic: Instructions: Compiling VESC's BLDC Tool on openSUSE
Replies: 4
Views: 555

Re: Instructions: Compiling VESC's BLDC Tool on openSUSE

Thanks for posting! I didn't knot that suse had a different version of qmake, good to know.

I should really make a forum dedicated to the VESC some time. The community is growing all the time and I think when the FOC implementation starts to mature even more people will be interested.