Search found 943 matches

by rew
20 Apr 2016, 18:24
Forum: General
Topic: VESC 4.12 unable to "make upload" the firmware
Replies: 22
Views: 10172

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

FYI, the old STLINk would come up in "DFU mode". Then you could update the firmware of the STLINK itself. When using it to program other devices, my stlink utility (st-util) reports: exiting DFU mode. The new STLINK (2.1, and apparently V2-a), presents itself as an USB disk (storage device...
by rew
20 Apr 2016, 07:35
Forum: FOC
Topic: FOC problems with small motor
Replies: 12
Views: 9040

Re: FOC problems with small motor

I get 40A motor current when my power supply shows 7A. What does it mean? Yes. When you have say a 16% duty cycle, the motor is connected to the power supply about 1/6th of the time. During that time the current rises. Then 5/6th of the time the motor is connected to ground, and the current decays,...
by rew
16 Apr 2016, 08:45
Forum: FOC
Topic: FOC configuration help
Replies: 6
Views: 5630

Re: FOC configuration help

Make sure you get the R&L& Labda measurements right. I somehow "lost" my measurements yesterday and didn't have the hardware around to remeasure them. So I just put in the numbers I had noted before, and then fiddled a bit with them. At some points it would show the behaviour you d...
by rew
11 Apr 2016, 16:13
Forum: Hardware Problems
Topic: acceleration problem
Replies: 5
Views: 3096

Re: acceleration problem

It is normal that it works this way. When you have the throttle at 10%, when the motor is unloaded, that is enough to make the motor turn max speed. But when you load the motor, you will notice a difference between 10%, 20%, 30% and so on. Compare it with a car: If you press the gas with the gears i...
by rew
10 Apr 2016, 10:33
Forum: Hardware Problems
Topic: acceleration problem
Replies: 5
Views: 3096

Re: acceleration problem

Hi, With the "remote control" you control the CURRENT through the motor. When you send say 10% of the max motor current through the motor when it is unloaded, the motor will accelerate to the maximum speed possible with this battery, and then stay there. To double check, connect the system...
by rew
10 Apr 2016, 10:26
Forum: General
Topic: PPM issue
Replies: 9
Views: 5486

Re: PPM issue

Dead zone is meant to prevent "jitter" type effects if your input method is analog. For example, if you have a joystick controlling an aileron it is irritating if they keep moving about when you have your stick in the same position. For a self-balancing thing, you will always have to be co...
by rew
07 Apr 2016, 22:18
Forum: General
Topic: PPM issue
Replies: 9
Views: 5486

Re: PPM issue

I was thinking: Why don't you just set a little deadtime? But the "balancing" thing explains things! then any "deadtime" is... deadly.
by rew
07 Apr 2016, 22:16
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 51766

Re: 14S VESC ?

One of the things you should realize is that the maximum voltage over the FET during normal operation is not only the battery voltage, but battery voltage + 0.6V. (could even be a bit more). If you say your battery sags from 58 to 54, it will do the opposite while braking. i.e. when you brake at 58,...
by rew
07 Apr 2016, 12:50
Forum: For sale, orders, etc.
Topic: VESC-based board(s) for sale....
Replies: 42
Views: 56979

Re: VESC-based board(s) for sale....

@lizardmech: yes. The footprint on the boards is just a 2x12 (24 pin) 0.1" header. I currently put males on top on the power and CPU module, and females on the bottom on the "driver" board. (Driver board = fet drivers, current aplifiers and voltages. = used to be DRV82xx). Oops... See...
by rew
06 Apr 2016, 12:23
Forum: For sale, orders, etc.
Topic: VESC-based board(s) for sale....
Replies: 42
Views: 56979

Re: VESC-based board(s) for sale....

Tadaa!!! http://prive.bitwizard.nl/dsc06402_small.jpg You might notice the missing capacitor on the driver board. I've decided that it is not necessary. I'd rather have the footprint and not need it than the other way around. Also there is a second capacitor on the small-power board. That is an atte...

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