MiVESC - smaller version of VESC 6

Post and discuss your VESC projects here.
lakotamm
Posts: 2
Joined: 17 Sep 2017, 07:36
Location: Copenhagen

MiVESC - smaller version of VESC 6

Postby lakotamm » 17 Sep 2017, 07:47

Hello, guys! :-)

2 days ago I finally started working on the project which I had been considering for the last 2 months - a smaller version of VESC. Currently, I am in a phase of choosing the best components, therefore, if you have any good ideas, let me know :-) I want to finish the schematic this month (September) the latest.

Targetted specification:
Input voltage - 52V
Current - 15A passive cooling, 30A constant current
PCB size - 35x25mm
Last edited by lakotamm on 21 Sep 2017, 16:35, edited 2 times in total.

pf26
Posts: 283
Joined: 28 Mar 2016, 14:37
Location: FR Valence

Re: MiVESC - smaller version of VESC 6

Postby pf26 » 17 Sep 2017, 09:33

Did you consider to monitor the Fets Vds instead of using shunts as done here: http://www.ti.com/tool/TIDA-00774?jktype=design
Maybe not linear enough for sensorless FOC though. But so much saved space..

ThierryGTLTS
Posts: 83
Joined: 09 Aug 2017, 11:10

Re: MiVESC - smaller version of VESC 6

Postby ThierryGTLTS » 17 Sep 2017, 09:57

Existing version here:

viewtopic.php?f=9&t=1513

Seems promising.

Have a Nice W-E.

Thierry

antonchromjak
Posts: 20
Joined: 17 Aug 2017, 08:09
Location: Slovakia

Re: MiVESC - smaller version of VESC 6

Postby antonchromjak » 17 Sep 2017, 10:15

Look at NTMFS5C604NL, LM5101A and AD8417 thats what I will be using in my next iteration. But if you can fit direct fet it will be better.

70mm x 18mm

top.png
top.png (421.61 KiB) Viewed 1516 times


bot.png
bot.png (390.73 KiB) Viewed 1516 times

lakotamm
Posts: 2
Joined: 17 Sep 2017, 07:36
Location: Copenhagen

Re: MiVESC - smaller version of VESC 6

Postby lakotamm » 17 Sep 2017, 21:49

Thank you guys for your input!
pf26 wrote:

I am a bit worried about using purely low side measurement in general. The sensorless FOC is more or less a requirement. I was thinking of using DRV8323 - which has integrated 3 shunt amplifiers, but then I realized that I would lose one of the advantages of V6 - I wouldn't be able to sample current while LOW side MOSFETs are not switched on (V0 and V7?). Wouldn't this create issues or lower precision of detection?

This is why I chose INA240 despite being quite big - trading size for precision.

antonchromjak wrote:Look at NTMFS5C604NL, LM5101A and AD8417 thats what I will be using in my next iteration. But if you can fit direct fet it will be better.


It looks nice! I am going through your schematics now.

Isn't INA240 is better than AD8417? I have to check the characteristics.
It looks like you are trading power for size - your design seems to have slightly lower resistance.

I will need to fit CAN BUS on mine and maybe I won't include inputs for hall sensors (or only as pads on the PCB).

rew
Posts: 914
Joined: 25 Mar 2016, 12:29
Location: Delft, Netherlands.

Re: MiVESC - smaller version of VESC 6

Postby rew » 18 Sep 2017, 06:24

lakotamm wrote: - I wouldn't be able to sample current while LOW side MOSFETs are not switched on (V0 and V7?).

V0 is: "all lowside fets are on". V7 is "all highside fets are on". With shunts in the lowside-to-ground connection you can only sample in V0. With a phase current sense mechanism you could sample whenever you like. But away from the moments that mosfets switch is probably best. That's when V7 sampling comes in. Either V0 or V7 is longer, so gives more time to do the sampling.

roman_luftronix
Posts: 1
Joined: 05 Jan 2018, 14:15
Location: Lviv, Ukraine

Re: MiVESC - smaller version of VESC 6

Postby roman_luftronix » 05 Jan 2018, 14:33

We're looking for a smaller CAN-controlled ESC for a copter.

Size and parameters of LittleBee 30A would be perfect.

How is your project progressing?


Return to “VESC Projects”

Who is online

Users browsing this forum: No registered users and 1 guest