## Search found 12 matches

10 Sep 2017, 09:22
Forum: General
Topic: VESC vs "Native" controller
Replies: 14
Views: 7203

### Re: VESC vs "Native" controller

So, guys, I don't understand what are your hypothesis concerning the problem ))

Rew (hello!) how can you explain the situation when observable ratio between max-speed and max-torque somehow depends on controller but not on motor constants?

thank you
28 Aug 2017, 08:24
Forum: General
Topic: VESC vs "Native" controller
Replies: 14
Views: 7203

### Re: VESC vs "Native" controller

Yes, actually you are right. Epic fail :) Unfortunately it have no any influence (as far as my engine is still alive :)) on the final situation. Engine marked as 350W nominal. I have set 750W for the sake of tweak :) and because of knowledge that in uphill moving native controller "eats" 1...
28 Aug 2017, 06:29
Forum: General
Topic: VESC vs "Native" controller
Replies: 14
Views: 7203

### Re: VESC vs "Native" controller

maybe the original controller was BLDC (not FOC?) and the VESC is FOC? they are both FOC, at least manufacturer of "native" controller say so. In that case it would be the difference between BLDC and FOC. We did some tests on an electric skateboard and found that on a VESC, the skateboard...
27 Aug 2017, 19:53
Forum: General
Topic: VESC vs "Native" controller
Replies: 14
Views: 7203

### Re: VESC vs "Native" controller

Hi Devin, thank you for your attention! Resistance in Ohms in FOC mode was something like 0,05Ohm (0,0514 once and 0,047 another time). I have setup battery limits to 15A (48V * 15A ~ 750W) So I have P = 750W, P = I^2*R, R ~ 0,1 Ohm ( detected resistance by 2 as I need phase to phase resistance) => ...
27 Aug 2017, 18:09
Forum: General
Topic: VESC vs "Native" controller
Replies: 14
Views: 7203

### VESC vs "Native" controller

Hello guys! I have VESC 4.12 and tried to use it with my geared motor-wheel (12'',350W, 48V, gear ratio 4.4). Also I have "native" FOC controller for this motor-wheel. "Native" controller has very modest current-limits, like 10A continous and 15A peak, so my idea was to "twe...
11 Apr 2017, 11:25
Forum: Hardware Problems
Topic: VESC has died, need help to diagnose reasons
Replies: 13
Views: 19878

### Re: VESC has died, need help to diagnose reasons

IMHO, the capacitors should catch the really fast transients before they do any harm. What kills the DRV is when your battery has an internal resistance that is a bit high. Then regeneration will cause the voltage to rise to the batteryvoltage + I * Ri. where I is the regen current adn Ri is the in...
08 Apr 2017, 19:09
Forum: Hardware Problems
Topic: VESC has died, need help to diagnose reasons
Replies: 13
Views: 19878

### Re: VESC has died, need help to diagnose reasons

Connected 3.3V from STM Nucleo board to 3.3 pin of dead VESC. Result: voltage measured between ground and any contact on VESC's 3.3 line was 1.3-1.2V instead of 3.3, Nucleo's linear regulator(LD39050PU33R) was very hot, current was 0.2A. I am a complete noob at electronics, but cannot understand how...
05 Apr 2017, 13:49
Forum: General
Topic: Too small throttle area
Replies: 6
Views: 3849

### Re: Too small throttle area

There are some "mapping" settings in ADC application - you can remap your input voltage in custom diapason. For example map 0-5V to 2-3V, so resolution of throttle will be higher. Have you tried to use this? And what mode have you used in ADC app? Current control or duty control? For me cu...
04 Apr 2017, 14:43
Forum: Hardware Problems
Topic: VESC has died, need help to diagnose reasons
Replies: 13
Views: 19878

### Re: VESC has died, need help to diagnose reasons

When braking a fast spinning motor, the motor inertia alone could regen enough power to increase the voltage to dangerous regions and kill DRV8302. chip. It is a good idea to first test a VESC using a current controlled power supply at moderate voltage - and to setup low current limits using bldcto...
04 Apr 2017, 14:31
Forum: Hardware Problems
Topic: VESC has died, need help to diagnose reasons
Replies: 13
Views: 19878

### Re: VESC has died, need help to diagnose reasons

look at your vesc under microscope if it too many garbage so that can be it(cheap chines vescs with too much garbage on it (i see it myself)) Unfortunately I have no any microscopes. my VESC is Mytech's - does it belong to cheap chineese vescs? for me it looks like ok and accurate enough, at least ...