Search found 278 matches

by pf26
01 Dec 2017, 18:13
Forum: VESC Projects
Topic: VESC in homemade lathe/drill press
Replies: 11
Views: 562

Re: VESC in homemade lathe/drill press

Most likely 30 is 60 (secondes per minutes) divided by 2 (because there are 2PI radians per turn).. Yes you probably need to change gearing to increase torque and reduce speed. As for the current, most of the time it will stay low, unless you really need torque for hard work - And only then you need...
by pf26
30 Nov 2017, 11:00
Forum: VESC Projects
Topic: VESC in homemade lathe/drill press
Replies: 11
Views: 562

Re: VESC in homemade lathe/drill press

From the data given, this motor can be run at max 10s or 36V, and this translates into 36*245=8820RPM (already quite a lot for a relatively large motor) The continuous current is said to be 60Amps (most likely with good ventilation, because you have 0.03x60^2=108W joule losses inside the winding) 60...
by pf26
29 Nov 2017, 13:19
Forum: General
Topic: VESC & CAN Bus communication to another MCU (NOT VESC)
Replies: 14
Views: 2749

Re: VESC & CAN Bus communication to another MCU (NOT VESC)

I think your sendPacket function has flaws:
- your need to send extended packets, not standard ones. (ie: the IDE bit in the CAN frame should be set)
- you seem to send only your "data" array, not the packet bytes.
by pf26
28 Nov 2017, 11:15
Forum: General
Topic: Failsafe shutdown of VESC
Replies: 4
Views: 210

Re: Failsafe shutdown of VESC

I think you could simply use a switch to force the STM32 in reset in case VESC goes mad, this can be done by connecting NRST (5) and GND (1) on P2 connector. Obviously not 100% failsafe. Disconnecting PVDD from DRV should work too, and safer. It was shown here how to do http://vedder.se/forums/viewt...
by pf26
26 Nov 2017, 14:31
Forum: FOC
Topic: Formulas of Ki, Kp, observer gain
Replies: 3
Views: 225

Re: Formulas of Ki, Kp, observer gain

From the link with the motor website, it is said to have 17.8 ohms winding ! If true, I doubt the motor will tolerate more than a few amps for more than a few secs. And this is not suitable for the VESC unless you change the shunts. Possibly 12000mH is in fact 12mH (12000uH), which is already quite ...
by pf26
15 Nov 2017, 17:42
Forum: For sale, orders, etc.
Topic: MINI compatible with VESC® Software
Replies: 30
Views: 2654

Re: MINI compatible with VESC® Software

The link to the OHSPARK pcb seems to be dead in the first post. Is there a way to buy these pcbs directly from you or someone else, or to get the pcb manufacturing files (gerber + drill..) ? Many thanks in advance. I am interested to make/buy a couple of these miniVesc..
by pf26
30 Oct 2017, 10:46
Forum: Custom Applications
Topic: Long Term Regen
Replies: 4
Views: 394

Re: Long Term Regen

You can see 2 application examples here http://omegawatt.fr/paille/app_example.zip
One controls a generator (and acquisition of sensor), the other one the wing pitch motor (and acquisition of IMU sensor).
Rather poorly written and commented sometimes in french - but I hope it helps.
by pf26
29 Oct 2017, 13:36
Forum: Custom Applications
Topic: Long Term Regen
Replies: 4
Views: 394

Re: Long Term Regen

I use a VESC for unusual power generation as well (prototype of this thing: http://monopale.forumcrea.com/viewtopic.php?id=14 , vids here, formerly using another controller: https://vimeo.com/182373528 ) I wrote a VESC custom application to calculate the generator braking torque in real time dependi...
by pf26
27 Oct 2017, 10:48
Forum: Feature Requests
Topic: Separately excited motors
Replies: 5
Views: 423

Re: Separately excited motors

My efficiency concern was only regarding the automotive alternator.
by pf26
26 Oct 2017, 09:30
Forum: Feature Requests
Topic: Separately excited motors
Replies: 5
Views: 423

Re: Separately excited motors

While this looks interesting for the price and extra control capabilities, I fear the total efficiency will remain lower than a comparable brushless motor. But this needs to be checked, and the exitation could be controlled to optimize the motor efficiency. Do you have some figures about no load pow...

Go to advanced search