Recent content by vedder

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.

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...

That should be possible with some minor modifications to the code.

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 the voltage. If you keep using 6s, change the motor gearing and...

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 :-)

Nice that you gave the new implementation a try. On a motor with so low inductance you can try increasing the switching frequency to 60 KHz or so. You can also experiment with the time constant for generating the current controller gains. Try 200µS or 1000 µS and see if you notice any...

I think this is solved in FW 2.4 that I pushed just now.

Nice to see that so many people have tried the FOC implementation already :-) This does not matter since FOC works in a completely different way. The FOC code is mostly separate from the BLDC code. This is most likely the temperature protection that activates. There is more switching with FOC...

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: R and L can be autodetected without starting the...

You can for example use the current norev button setting. Where to connect the buttons and how they work is explained in the text box. You have to divide the ERPM with half the motor pole number. You motor has 14 poles, so you can divide this value by 7. Run detection as explained in my...

I think the three shunt design is worth it for difficult motors such as RC motors. The software is really where I spend 95% of the efforts, making new hardware is not too difficult. The three shunt design would be less compact and a bit more expensive though. Try to disable safe start in the...

Yes, by principle :-) The main problem with low L and high PWM frequency is actually current measurement, especially with two shunts on the low side. The current will be present on the low side shunts only for a fraction of the PWM cycle, especially on high duty cycle, and during this time the...

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...

Increase the Minimum ERPM from the default of 150 to something like 800. You calculate the ERPM with kv * voltage * (motor poles / 2). The problem is that the switching frequency (40 khz) is too low to get enough samples to track the motor at that speed, and the estimator will loose tracking...

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. You can increase the min rpm in the...