Search found 943 matches

by rew
24 Apr 2016, 06:39
Forum: General
Topic: Sensored motor - detection
Replies: 35
Views: 16093

Re: Sensored motor - detection

Wait! are you mounting your own hall sensors? Then it is MUCH more likely that your hall sensor setup is not accurate enough as opposed to the .

Here the SS411A only cost EUR 2. http://nl.farnell.com/3111465
by rew
23 Apr 2016, 11:10
Forum: General
Topic: VESC 4.12 unable to "make upload" the firmware
Replies: 22
Views: 9788

Re: VESC 4.12 unable to "make upload" the firmware

If you don't connect the battery, just the USB. Does the VESC work?
No? You have a standard VESC that cannot back-power the USB system like mine does.
by rew
23 Apr 2016, 11:05
Forum: General
Topic: Series / parallel selector
Replies: 4
Views: 2502

Re: Series / parallel selector

This will work.... once.... The moment you switch, the "old" fets will be still conducting and the new ones will create a short circuit. There really needs to be some sequencing to make sure that things don't break the moment you switch. You have to think really hard about what happens if ...
by rew
22 Apr 2016, 04:46
Forum: Hardware Problems
Topic: DRV8302 Magic Smoke
Replies: 35
Views: 18769

Re: DRV8302 Magic Smoke

Caps at 50v: no problem. You do need low ESR ones, all brands make cheaper versions that have higher ESR.

Some Aliexpress sellers may relabel normal capacitors as the low ESR version, or rebrand by changing the print........
by rew
22 Apr 2016, 04:40
Forum: FOC
Topic: FOC max current
Replies: 21
Views: 11204

Re: FOC max current

What power source are you using? Is it strong enough? I get the screaming when the powersupply drops out.
by rew
22 Apr 2016, 04:36
Forum: General
Topic: VESC 4.12 unable to "make upload" the firmware
Replies: 22
Views: 9788

Re: VESC 4.12 unable to "make upload" the firmware

Drag-drop is exactly what stlink v2.1 is supposed to allow. So.... i think you programmed you VESC correctly. Why you mac thinks your VESC is drawing too much current... I dont know: the USB 5V is not connected on a standard VESC. (Optional on my implementation.... the reason? My Vesc is running a b...
by rew
21 Apr 2016, 07:27
Forum: General
Topic: VESC 4.12 unable to "make upload" the firmware
Replies: 22
Views: 9788

Re: VESC 4.12 unable to "make upload" the firmware

I've been working with STM32 chips longer than I have been working with VESC. When I compile VESC I get an annotated binary (.elf) file that I use with gdb and st-util to put into my STM32. Chibios by default also produces a raw binary file (.bin). They usually reside in the "build" direct...
by rew
21 Apr 2016, 07:16
Forum: Hardware Problems
Topic: DRV8302 Magic Smoke
Replies: 35
Views: 18769

Re: DRV8302 Magic Smoke

40MOhm is so much that it would read "OL" on my multimeter. That''s so much that you can't tell the difference from "proper" behaviour. Moreover, you're testing leakage. If your capacitor had a 100k leakage (you measured 400 times more, remember!), about 0.5mA would flow at 50V. ...
by rew
20 Apr 2016, 18:36
Forum: Hardware Problems
Topic: DRV8302 Magic Smoke
Replies: 35
Views: 18769

Re: DRV8302 Magic Smoke

FYI, I am building a DCDC converter based on VESC hardware. With 5V output, I had about 7V of ripple on the output.... That was with a low-ESC 100uF electrolytic.... Adding a ceramic 10uF cleaned things up. No noticable ripple..... Really, the capacitors are important.
by rew
20 Apr 2016, 18:28
Forum: FOC
Topic: FOC problems with small motor
Replies: 12
Views: 8592

Re: FOC problems with small motor

in the hwconf directory you have two files for each hardware version. Inside the ".h" for your hardware version you can find the definition of your shunt resistor. Just search the file for 001 and you'll find the 0.001 in the define for the shunt.

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