Search found 28 matches

by Ecyclist
09 Jan 2018, 22:29
Forum: FOC
Topic: DRV8302 faults with FOC
Replies: 26
Views: 11691

Re: DRV8302 faults with FOC

So, it makes no difference if I use 2.2µF or 4.7µF cap?
by Ecyclist
09 Jan 2018, 16:45
Forum: FOC
Topic: DRV8302 faults with FOC
Replies: 26
Views: 11691

Re: DRV8302 faults with FOC

My question was related to C18 capacitor. My 3 680 capacitors are closer to FETs than originally because they are at 90 deg to the board.
vesc caps at 90 deg..JPG
vesc caps at 90 deg..JPG (175.72 KiB) Viewed 457 times
by Ecyclist
08 Jan 2018, 18:06
Forum: FOC
Topic: DRV8302 faults with FOC
Replies: 26
Views: 11691

Re: DRV8302 faults with FOC

At this point I haven't used FOC in my setup. From what I read, with FOC, a motor will be more efficient and quieter. Is adding extra capacitor on top of the existing one or changing to larger capacitor the way to go? If a larger capacitor is a good option for a new build, which one is the best for ...
by Ecyclist
31 Dec 2017, 17:19
Forum: Hardware Problems
Topic: VESC DRV8302 Problems MOSFET Swapping Considerations to all!
Replies: 14
Views: 2202

Re: VESC DRV8302 Problems MOSFET Swapping Considerations to all!

Not possible because it's not the same footprint. And Direct FETs are very difficult to solder. A very small fan can do the job, or have a look at the VESC 6 done by Stewii here http://www.electric-skateboard.builders/t/hw6-4-based-esc-escape/37579 Have a Nice Day and Happy New Year 2018. Thierry T...
by Ecyclist
31 Dec 2017, 02:39
Forum: Hardware Problems
Topic: VESC DRV8302 Problems MOSFET Swapping Considerations to all!
Replies: 14
Views: 2202

Re: VESC DRV8302 Problems MOSFET Swapping Considerations to all!

Unsoldering the FETs with hot air should be quite easy if you had a hot air station. I think you better leave the FETs in place and add a thick copper bar to the drain of the 3 top FETs, in order to connect them thermally with your aluminum case (it will connect these electrically too, unless you h...
by Ecyclist
29 Dec 2017, 02:55
Forum: Hardware Problems
Topic: VESC DRV8302 Problems MOSFET Swapping Considerations to all!
Replies: 14
Views: 2202

Re: VESC DRV8302 Problems MOSFET Swapping Considerations to all!

Pretty much the same problems. That MOSFET isn't that much better, it and the original have roughly the same on resistance, gate charge and thermal properties. if you're only after 70A have you looked into this style of VESC: https://www.ebay.co.uk/itm/VESC-New-4-12-Motor-controller-Latest-2-54-fir...
by Ecyclist
28 Dec 2017, 21:48
Forum: Hardware Problems
Topic: VESC DRV8302 Problems MOSFET Swapping Considerations to all!
Replies: 14
Views: 2202

Re: VESC DRV8302 Problems MOSFET Swapping Considerations to all!

Thank you all for sharing your knowledge I read this thread a couple of times and learned a thing or two, but I'm still going to ask you a simple question. Can I use heatsink with proposed FDBL0110N60 MOSFET or I will have the same problem with cooling as with your typical VESC MOSFET? Are there oth...
by Ecyclist
27 Dec 2017, 22:31
Forum: General
Topic: Improve cooling
Replies: 10
Views: 1874

Re: Improve cooling

It is a very nice box to look at, and it fits really well with the rest of your bike. As far as I can tell the VESC was not designed for lots of power or heat. It was designed to fit into tiny spaces which it does very well. Someone tried attaching heat transfer pipes: http://vedder.se/forums/viewt...
by Ecyclist
27 Dec 2017, 00:03
Forum: General
Topic: Improve cooling
Replies: 10
Views: 1874

Re: Improve cooling

The heat in the MOSFET has to go from the silicon die, through the thick, insulating epoxy case then through your high thermal conductivity paste and the finally to your large aluminium heatsink. The epoxy dominateds the heat path and absorbs the heat eventually killing the MOSFETs. For the IRFS753...
by Ecyclist
26 Dec 2017, 19:00
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 19616

Re: 14S VESC ?

Thanks Ecyclist! Do you think it's safer if I add two of these in parallel with my 2x470uF? https://www.electrokit.com/uhe1j102mhd-1000uf-63v-o16x35-5.48500 It will be safer, but still no go in my book. Maybe it will work if you keep your 13S at low charge. That is my plan but without re-gen. Marry...

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