14S VESC ?

General topics and discussions about the VESC and its development.
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Ecyclist
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Location: San Diego, CA

Re: 14S VESC ?

Postby Ecyclist » 19 Dec 2017, 16:14

I see a lot of talk about Amps but almost nothing about 14S battery.
I built a mid drive E-bike, and so far I'm running it on 10S, but I'm interested in running it on 13S.
Has anyone been consistently running VESC with 14S or 13S 18650 Li-Ion battery without re-gen?
What is the max voltage without re-gen that is OK to use with VESC 4.7?
The pack with testers..JPG
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ThierryGTLTS
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Re: 14S VESC ?

Postby ThierryGTLTS » 19 Dec 2017, 17:50

Hi Ecyclist,

I love your work, very nice indeed :!:

Unfortunately, the VESC 4.12 and 6 are limited by the DRV830X whose absolute maximum voltage is 60V.

For safety reasons, if you use regen, you are more limited, and 13S is the maximum without risk.

But several guys have developped their own version up to 150kW, but with high voltage HW.

Have a Nice Day.

Thierry

pf26
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Re: 14S VESC ?

Postby pf26 » 19 Dec 2017, 18:54

I fear 13s is already quite risky.
12s is safe provided you have good capacitors near the VESC.
@ThierryGTLTS: did you use a VESC with regen at 13s, or know someone who did that for long times ?

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Ecyclist
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Re: 14S VESC ?

Postby Ecyclist » 20 Dec 2017, 03:01

ThierryGTLTS wrote:Hi Ecyclist,

I love your work, very nice indeed :!:

Unfortunately, the VESC 4.12 and 6 are limited by the DRV830X whose absolute maximum voltage is 60V.

For safety reasons, if you use regen, you are more limited, and 13S is the maximum without risk.

But several guys have developped their own version up to 150kW, but with high voltage HW.

Have a Nice Day.

Thierry

Thank you Thierry.
To be honest I didn't expect any replies any time soon because this thread was dead for a while. So, thank you both.
I have a 13S charger from Luna Cycle that can be set for 80, 90, or 100% charge. I think that if I use it at 90% charge I should be OK.
Once I put 6000W motor on my build, I will push VESC a little harder. So far, my VESC is running at ambient. I assume that at 50 V and 60 Amps things will be different. We will see what this baby can do.

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TheFallen
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Re: 14S VESC ?

Postby TheFallen » 21 Dec 2017, 08:54

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.

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Ecyclist
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Re: 14S VESC ?

Postby Ecyclist » 23 Dec 2017, 18:52

TheFallen wrote: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 not going to ask it to feed 6kW.
Also, these RC motors that are rated at 3200W or 6000W are not exactly what manufacturers say they are. Maybe they can consume that much energy, but most of it will be wasted. I'm not going to push more than 3000W into 6000W motor. Actually, I will be perfectly happy with 2500W. For a mountain e-bike this will be more than plenty. Some guys're building dragsters or tractors, and for that you will need big motor with big controller. Not something I'm interested in at the moment.
That's my obsession for now:
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TheFallen
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Re: 14S VESC ?

Postby TheFallen » 24 Dec 2017, 01:10

The VESC can totally handle larger motors, I've had 4 VESCs driving 6-7kW motors quite happily under the most stressful conditions (robot combat) without exploding. But its a complete waste of a motor, the VESC can only provide 50% of the current they want so it just doesn't have the torque you'd expect from that size of motor.

That is a gorgeous setup. I'd love to see some more of the motor. Are you running sensored?

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Ecyclist
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Re: 14S VESC ?

Postby Ecyclist » 24 Dec 2017, 03:03

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 6000W.
Before I bought the Alien 8072 motor, I had bought another motor. It is the same size and the same copper mass, but is rated at 2700W. I think that most of these motors are overrated and that the other motor, made by Leopard, is close to real rating. The Leopard motor is not sensored, so I'm planning on installing hall sensors in it and change shaft diameter from 12 mm to 10 mm. I could redesign the cycloidal transmission I built to work with 12 mm shaft, but, at this point, changing the shaft will be easier.
Here is the thread of my build, if you're interested:
https://endless-sphere.com/forums/viewt ... =3&t=90432
BTW: Merry Christmas to you all!
Leopard motor.JPG
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ThierryGTLTS
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Re: 14S VESC ?

Postby ThierryGTLTS » 24 Dec 2017, 13:13

Most RC motors are power consumption rated.

Industrial motors are mechanical power rated, and it can be very different :!:

Do you have any facilities to test true mechanical power :?: :!:

I'm really curious to know what real mechanical power I can expect from Alien power motors.

Merry Christmas to all.

Thierry

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TheFallen
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Re: 14S VESC ?

Postby TheFallen » 24 Dec 2017, 19:34

Alien Power Systems are just re-branded Maytech motors. Having bought quite a few of the C80100s we've found them of wildly differing quality.

For running our C80100s we've used an MGM 250A ESC and have achieved the rated power. We also achieved about 4 times the rated power when the current limiting on the ESC was opened right out and the motor stalled. The motor did not survive :D

There is a really lack of decent cheap-ish 120A ESCs, and while I am working on this, I'm having more than my fair share of bad luck.


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