Search found 30 matches

by Ecyclist
27 Dec 2017, 00:03
Forum: General
Topic: Improve cooling
Replies: 10
Views: 7422

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: 53066

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...
by Ecyclist
26 Dec 2017, 18:52
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 53066

Re: 14S VESC ?

I've heard they're fairly responsive over email which is the best place to go for custom/specials. But for links try Alibaba: https://maytech.en.alibaba.com/product/1972438852-800255909/Maytech_brushless_large_outrunner_motor_12090_for_large_RC_helicopter_airplane_uav.html Doing alright in general,...
by Ecyclist
26 Dec 2017, 17:47
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 53066

Re: 14S VESC ?

Hi guys. I've messed up and bought a VESC for my 13S5P E-bike. I didn't do enough research beforehand, I thought the 60V input rating meant that it would take my 54.6Vmax battery, but now I know the voltage on the input side can well exceed the battery voltage. How screwed am I? Will I be OK if I l...
by Ecyclist
25 Dec 2017, 18:50
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 53066

Re: 14S VESC ?

Unfortunately, I don't have a test station to measure efficiency of electric motors. I can build almost anything and I have tools for that, so maybe one day. About theses Chinese motors. I suspect that they are all made in one mega factory, but I can't find anything over 63 mm on Maytech website. Th...
by Ecyclist
24 Dec 2017, 22:41
Forum: General
Topic: Improve cooling
Replies: 10
Views: 7422

Re: Improve cooling

All my VESC fets are thermally connected to the case with Thermal Paste High Performance Heatsink Compound.
Am I missing something?
Thermal Paste High Performance Heatsink Compound.jpg
Thermal Paste High Performance Heatsink Compound.jpg (12.26 KiB) Viewed 5102 times
by Ecyclist
24 Dec 2017, 03:03
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 53066

Re: 14S VESC ?

At this point,I'm running 6374 3200W sensored motor, but I feel that this motor is struggling. So, I figured it would be a good idea to kick it one notch up and use 8072 sensored motor. Both motors came from your neck of the woods. They are Alien Power System motors out of UK. The 8072 is rated at 6...
by Ecyclist
23 Dec 2017, 18:52
Forum: General
Topic: 14S VESC ?
Replies: 97
Views: 53066

Re: 14S VESC ?

3kW. A stock VESC can handle a 3kW motor, the 2 PCB variants from eBay may handle more, call it 4.5kW tops. If you find/make a brushless ESC that can handle 6kW for ~$150 then do tell. I have no clue what you mean by saying "can handle". VESC will work fine with a bigger motor. I'm just n...
by Ecyclist
21 Dec 2017, 00:22
Forum: VESC Projects
Topic: High RPM rc motor for Ebike
Replies: 5
Views: 13406

Re: High RPM rc motor for Ebike

With 530KV and 12s at 100% duty cycle, you get something like 25000RPM and 250kERPM with 10 pole (assuming pole pairs). If I rekon well. I think this is about 4 times as many as the VESC can handle without issue in FOC mode. Maybe it is a bit better in BLDC mode. Anyway, this would limit you to 1/4...
by Ecyclist
20 Dec 2017, 06:08
Forum: General
Topic: Improve cooling
Replies: 10
Views: 7422

Re: Improve cooling

You can cool VESC like this.
VESC case 1.JPG
VESC case 1.JPG (52.9 KiB) Viewed 5161 times

VESC case 2.JPG
VESC case 2.JPG (59.85 KiB) Viewed 5161 times

VESC case 3.JPG
VESC case 3.JPG (41.69 KiB) Viewed 5161 times

Go to advanced search