Search found 296 matches

by pf26
20 Oct 2017, 17:28
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 110
Views: 15483

Re: "Peak Efficiency" Control Mode?

Did you try to record the measurements of a know scenario (like 50% throttle for 20 secondes, then 0%), with a real VESC board ? (for instance using VSC monitor with bluetooth on android). I think it would be nice to validate the model, especially regarding the motor/transmission/aero losses.
by pf26
19 Oct 2017, 12:14
Forum: Hardware Problems
Topic: new vesc and my c-6354 outrunner with 295kv
Replies: 4
Views: 957

Re: new vesc and my c-6354 outrunner with 295kv

Does the VESC LED flash red 3 times when acceleration stops ?
Did you try to read the faults using bldc-tools ?
by pf26
08 Oct 2017, 17:07
Forum: VESC Projects
Topic: High RPM rc motor for Ebike
Replies: 5
Views: 1164

Re: High RPM rc motor for Ebike

With 530KV and 12s at 100% duty cycle, you get something like 25000RPM and 250kERPM with 10 pole (assuming pole pairs). If I rekon well. I think this is about 4 times as many as the VESC can handle without issue in FOC mode. Maybe it is a bit better in BLDC mode. Anyway, this would limit you to 1/4 ...
by pf26
05 Oct 2017, 09:17
Forum: FOC
Topic: FOC poor efficiency at high speed
Replies: 20
Views: 3615

Re: FOC poor efficiency at high speed

Maybe you want to try to increase the switching frequency (default 20kHz) and see if it helps. I think processing power does allow a bit more, like 30kHz (I never tried though). I guess you are already in the 30kERPM range or so. Is the motor driving a propeller ? For some reason your phase 1 and 2 ...
by pf26
03 Oct 2017, 13:26
Forum: FOC
Topic: FOC poor efficiency at high speed
Replies: 20
Views: 3615

Re: FOC poor efficiency at high speed

You may also keep the original firmware with the larger shunts, and simply consider all your current measurements and settings are off by a certain coefficient. Be aware when soldering the shunts that there are 4 connection points (2 little ones for voltage sensing accross the shunt).
by pf26
03 Oct 2017, 06:44
Forum: General
Topic: Emergency braking concept for VESC
Replies: 40
Views: 11681

Re: Emergency braking concept for VESC

To my knowledge, there is no DeadMan switch input implemented the way you want (for Vesc4, I don't know much about 6) But in the app_adc application (which you probably use for the throttle), there are 2 input buttons available, one for rev (=Rx), one for cruisecontrol (=Tx). You could change the ad...
by pf26
30 Sep 2017, 07:35
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 110
Views: 15483

Re: "Peak Efficiency" Control Mode?

The ebikes.ca simulator is great ! By default, it tells you what speed you get with 0 acceleration. When you slide the speed cursor, it will tell you the grade it would require to reach that speed OR the acceleration you would get if the grade was to stay at 0%: notice that 12.1% grade is the same a...
by pf26
29 Sep 2017, 10:21
Forum: FOC
Topic: FOC poor efficiency at high speed
Replies: 20
Views: 3615

Re: FOC poor efficiency at high speed

In conf_general.h, we should uncomment and change the line like this :
#define CURRENT_SHUNT_RES 0.003 // 3 mOhms shunt
Or maybe someone can send you an already compiled version like this. (I have many other changes in the code, so I better no send you mine)
by pf26
28 Sep 2017, 06:45
Forum: FOC
Topic: FOC poor efficiency at high speed
Replies: 20
Views: 3615

Re: FOC poor efficiency at high speed

@ protontim: I was meaning to look at the "sampled data" VESC tool graphs to acquire at a faster rate, and visualize the current samples "sinewaves". Changing shunt requires more than a different setting, it requires a new firmware.
by pf26
28 Sep 2017, 06:36
Forum: General
Topic: Strange behaviour on Regen mode
Replies: 10
Views: 2106

Re: Strange behaviour on Regen mode

If you power down the VESC, sure it will clear its faults. But if you keep it powered, even if it flahes 3 times to tell it had an error and needs restarting, then it should keep its faults in memory. If you kept it powered by the battery and have seen no faults, then I suspect your battery BMS dete...

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