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by rew
16 Sep 2017, 20:11
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8285

Re: "Peak Efficiency" Control Mode?

You're not reading my posts, but only quoting them in full, I'm going to stop reading your posts too.
by rew
16 Sep 2017, 10:16
Forum: Hardware Problems
Topic: Impossible to flash
Replies: 3
Views: 364

Re: Impossible to flash

"good engineering" dictates that hardware designers make their stuff such that the software guys cannot break it. In practice, nowadays with an ESC like the VESC that is not realistic. Software is part of the module that protects itself against breakage. And as with all open source, if you...
by rew
16 Sep 2017, 10:08
Forum: FOC
Topic: Motor doesn't spin, only squeaks (FOC with encoder)
Replies: 13
Views: 842

Re: Motor doesn't spin, only squeaks (FOC with encoder)

Remove C5, C6, C7.
by rew
16 Sep 2017, 10:07
Forum: General
Topic: "Peak Efficiency" Control Mode?
Replies: 108
Views: 8285

Re: "Peak Efficiency" Control Mode?

Devin, I've been thinking about how to explain things. The picture that does not apply to BLDC motors that you keep posting is based on the simple assumption that all losses are due to copper losses. In first approximation that's true. So... We have a motor where I = U / R and U = Uapplied - Ubemf ....
by rew
14 Sep 2017, 17:24
Forum: General
Topic: Total dead-time for MOSFETs.
Replies: 5
Views: 532

Re: Total dead-time for MOSFETs.

The biggest problems come from the FALLING edge. When the gate is driven low, the mosfet starts to turn off. When that turning off takes too long, the other side may already be turning on. That's when shoot-through happens. I had this happening when I used different mosfets with a much lower thresho...
by rew
14 Sep 2017, 17:17
Forum: General
Topic: Fast Current control with reverse
Replies: 20
Views: 2173

Re: Fast Current control with reverse

My guess is that the FOC-parameters (R, L , lambda etc) are not correctly set. Then once the "sensorless" kicks in, you get into trouble. Postponing it for a speed where it somehow doesn't matter is ignoring the problem. Might be a good workaround for you, but it isn't the best solution. S...
by rew
13 Sep 2017, 17:34
Forum: General
Topic: Dual control
Replies: 9
Views: 630

Re: Dual control

There is a subdirectory called "applications" or something like that. Then there is a file called app_adc.c or something like that.

The whole thing should be pretty readable even for someone not expert in "C".
by rew
13 Sep 2017, 17:29
Forum: General
Topic: Power Limiting instead of Current Limiting
Replies: 25
Views: 1460

Re: Power Limiting instead of Current Limiting

Sorry. "No can do". Arduino is not my speciality.
by rew
13 Sep 2017, 09:50
Forum: FOC
Topic: Motor doesn't spin, only squeaks (FOC with encoder)
Replies: 13
Views: 842

Re: Motor doesn't spin, only squeaks (FOC with encoder)

Even I have been able to mess things up so that a "read default configuration" followed by "write configuration" would revive hardware that I thought had died....
by rew
13 Sep 2017, 09:47
Forum: General
Topic: VESC vs "Native" controller
Replies: 14
Views: 1946

Re: VESC vs "Native" controller

I dont understand your question. The VESC has internal limitations that cause the maximum dutycycle to be 95%. This results in say 47.5V max motor voltage at 50V battery voltage. Another ESC may be able to deliver 100% dutycycle and achieve a higher unloaded RPM. Also SUPPOSE that the VESC has a con...

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