Questions About 200A (or more) Brushless ESCs

[Eventorizon]

Still managed to blow up two of them even with those caps...

These are the modified VESC's designed by Rory Mangles of Team Nuts; uprated FETs, Caps and a variety of other tweaks that I can't remember. We are also only driving around 60Kg max on hours which probably helps even if the motors a 3770W Continuous.

[Rapidrory]

Yeah, experience tells me rotomaxes and VESCs don't mix too well in combat...

[TechAUmNu]

These are the modified VESC's designed by Rory Mangles of Team Nuts; uprated FETs, Caps and a variety of other tweaks that I can't remember. We are also only driving around 60Kg max on hours which probably helps even if the motors a 3770W Continuous.

Yeah that's the ones I blew the DRV chip on three of them. Managed to replace one but we switched to the VESC-X and haven't had a single problem with them. Even at 80A 8s with 80,000 erpm

[Eventorizon]

Yeah that's the ones I blew the DRV chip on three of them. Managed to replace one but we switched to the VESC-X and haven't had a single problem with them. Even at 80A 8s with 80,000 erpm

We were at 80A, 12S, 80'000 ERPM on the MVESC's. I think the weight makes a difference (60kg not 110 as mentioned before), and the quality of the Scorpions could play a factor too. I would be willing to bet there is some significant variation in the consistency of a Rotomax and other cheaper motors. They may pack a lot of power but i think that is partly their undoing when it comes to being drive motors. I have no evidence as such to back that up, purely anecdotal, but it was a dodgy Rotomax that kept killing Pulsars VESC's.

[Ellis]

Actually not quite true. A motor seemed to consistently take out various SimonK-flashed ESCs in series 2. In series 1 (when I ran VESCs) it was the Mangled VESCs having the wrong (50v) ceramic caps and overrunning the eRPM limit pretty badly that made them die.

It's basically impossible to run 28p motors on current-gen VESCs reliably unless they're extremely low KV or you undervolt.

[TechAUmNu]

It's basically impossible to run 28p motors on current-gen VESCs reliably unless they're extremely low KV or you undervolt.

Good thing I am making some new ones then since VESC6 is way too expensive.

[EventorizonIan]

To add to Alex's previous posts, whilst I know people have had problems with even upgraded VESCs I feel it is worth pointing out that we haven't had a single Mangle VESC failure in almost a year running the scorpion HK 5020 450kv motors, of which we use 8 at a time. Their peak is 120 amps at 5320 watts, which we have made full use of. Yes Smash is only 60kg but we have driven with 2 HK 5020s moving well in excess of 110kg.

Eaun ; What sort of price are you trying to bring your brushless ESCs in at?

[TechAUmNu]

Euan; What sort of price are you trying to bring your brushless ESCs in at?

I would also add that the three we broke, 1 we ran on a lab supply and regen broke it by overvoltage, 2 was from too high erpm 130000, and 3 was when mucking around with hall sensors. So none actually failed while in use, but the ability to damage them accidentally is really easy.

As for pricing on the 300A vesc, its likely to be £150 bom +£12 board cost. So probably selling for £300. That will probably change though. Once i finish the layout and get some made i will be sending some out for beta testing at parts cost.