Search found 187 matches

by serious_sam
Mar 28 2020 6:38pm
Forum: Motor Technology
Topic: The person who has been running higher power through hubmotors than anyone here doesn't use Ferro Fluid
Replies: 10
Views: 223

Re: Some Motors Incompatible with Statorade / Ferrofluid cooling?

Hopefully this magnets coming unglued thing is just an already rectified adhesive selection issue. Hopefully. But knowing Chinese manufacturers, probably not. That's why the "Some Motors Incompatible with Statorade/Ferrofluid cooling" thread will be helpful. Getting a 40% boost in steady state torq...
by serious_sam
Mar 28 2020 7:19am
Forum: Motor Technology
Topic: The person who has been running higher power through hubmotors than anyone here doesn't use Ferro Fluid
Replies: 10
Views: 223

Re: Some Motors Incompatible with Statorade / Ferrofluid cooling?

According to Justin's thorough testing, ferro fluid adds what 10%-20% to cooling, No. According to the Grin website, "on average roughly doubling the thermal conductivity from the copper windings to the outside environment"..."you can run it at roughly 40% higher sustained torque and power without ...
by serious_sam
Mar 28 2020 5:20am
Forum: Motor Technology
Topic: Roman Kostrygin - Sur-Ron 16kw outrunner
Replies: 46
Views: 6503

Re: Roman Kostrygin - Sur-Ron 16kw outrunner

That's really bad. F#ck. It looks like there are large cut-outs in the rotor ? If so, terrible terrible idea. That's some serious negligence right there. High energy equipment should be engineered properly, exactly for this kind of reason. Home made shit is fine if you're only risking your own balls...
by serious_sam
Mar 27 2020 11:15pm
Forum: Motor Technology
Topic: Some Motors Incompatible with Statorade / Ferrofluid cooling?
Replies: 20
Views: 568

Re: Some Motors Incompatible with Statorade / Ferrofluid cooling?

I've used Statorade in about 5 motors now over the last ~4 years. Thanks for sharing all that great data. I'm regularly running my MXUS3k up to 130C, in a 26" wheel, with Statorade and Hubsinks. Only done about 1000km so far. Your experience gives me some confidence that I can get a decent life out...
by serious_sam
Mar 26 2020 10:38pm
Forum: Motor Technology
Topic: The person who has been running higher power through hubmotors than anyone here doesn't use Ferro Fluid
Replies: 10
Views: 223

Re: Some Motors Incompatible with Statorade / Ferrofluid cooling?

Why? The person who has been running higher power through hubmotors than anyone on the forum for almost a decade doesn't waste the time or money (and as it turns out, motors) using FF. I cringe and feel embarrassed for you, the way you so often try to brag about having a high-power hub motor. And n...
by serious_sam
Mar 26 2020 6:08pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Off-road ebike swing arm setups
Replies: 11
Views: 658

Re: Off-road ebike swing arm setups

The problem is that you end up with a sharp gradient of change in temper (strength gradient) across the weld HAZ. It's the equivalent of putting a notch or drilling a hole at that location. And often the welds are in areas of high stress. So you've got high stress, at a stress concentration, through...
by serious_sam
Mar 26 2020 5:36pm
Forum: Motor Technology
Topic: Some Motors Incompatible with Statorade / Ferrofluid cooling?
Replies: 20
Views: 568

Re: Some Motors Incompatible with Statorade / Ferrofluid cooling?

My understanding is that some adhesives used by some manufacturers get **dissolved** by the FF. That sounds like what's happening. The adhesives need to be oil resistant in order to run FF. It's highly likely that not all motor manufacturers take that into account. Possibly temperature plays a part...
by serious_sam
Mar 26 2020 6:47am
Forum: E-Bike Build Threads / Photos & Video
Topic: Off-road ebike swing arm setups
Replies: 11
Views: 658

Re: Off-road ebike swing arm setups

flat tire wrote:
Mar 21 2020 6:17pm
Don't use welded aluminum for structural pieces unless you already know about and are prepared to do post weld treatment otherwise you will have to overbuild for required toughness and reliability.
This.
by serious_sam
Mar 26 2020 5:19am
Forum: Motor Technology
Topic: Some Motors Incompatible with Statorade / Ferrofluid cooling?
Replies: 20
Views: 568

Re: QS Motors incompatible with Statorade / Ferrofluid cooling?

Let's try to keep to the ferrofluid aspect, or at least just tolerating & shedding heat, Excellent topic. Good information for prospective FF users. If I could make 2 suggestions. 1. Remove the "QS" from the title. Make it about FF in any hub motor. 2. If people could post their bad experiences wit...
by serious_sam
Mar 24 2020 5:09am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1231
Views: 127624

Re: Nucular electronics - complete kit for ev! [beta]

madin88 wrote:
Mar 24 2020 4:26am
furthermore all the magnets were loose because the FF did react with the glue and dissolved it.
Shit. That's not good. What motor?
by serious_sam
Mar 22 2020 5:31am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1320
Views: 161246

Re: bluetooth BMS?

So, I went for a ride today. I used just about 55% from a fully charged (20S5P, 15Ah) pack. Coulomb counting from Nuc 12F agrees with rested voltage (indicating about 45% remaining). But the BMS thinks I've only got 10% left. It should be reading around 50%, based on the pack voltage (~3.69V per cel...
by serious_sam
Mar 21 2020 11:20pm
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1231
Views: 127624

Re: Nucular electronics - complete kit for ev! [beta]

Back from the ride. I found a section of flat road, and rode back and forth, over and over. Accelerated smoothly to minimise motor heating during the take off part of each lap. Used no regen. These power figures are based on the peak number that I saw on the first lap of each test, then I continued ...
by serious_sam
Mar 21 2020 6:04pm
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1231
Views: 127624

Re: Nucular electronics - complete kit for ev! [beta]

FW is only inefficient if you use it on motor with surface mounted magnets. On IPM motors it usually is a good thing since on most of them you can gain RPM and torque so you would even see higher ETA and less heat when using it (over the entire RPM range then) I guess the majority of us are using s...
by serious_sam
Mar 21 2020 5:18pm
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1231
Views: 127624

Re: Nucular electronics - complete kit for ev! [beta]

you can try, but "feelings" about how much it makes a different is not really measureable because of so many factors. Or I can just ride on the same path over and over and look at the screen to see power/speed/temperature. Sure there is more measurement error, but I'm not looking for exact perfect ...
by serious_sam
Mar 21 2020 7:51am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1231
Views: 127624

Re: Nucular electronics - complete kit for ev! [beta]

Merlin wrote:
Mar 21 2020 7:44am
in normal usage to gain 10-15kph more i think your Efficiency loss is below 5%
You've got me wondering now. Tomorrow I might do some runs with/without FW, and takes notes of the power requirements and temperatures. I'll report back here what I get.
by serious_sam
Mar 21 2020 7:30am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1231
Views: 127624

Re: Nucular electronics - complete kit for ev! [beta]

maybe this is the reason why higher voltage setups doesnt gain any speed advantages compared to lower voltage setups ;( Sounds about right. But FW is inefficient, so using it all the time just burns power and overheats the motor. It's like a turbo boost button. Only good in short bursts. Trying to ...
by serious_sam
Mar 21 2020 7:16am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1231
Views: 127624

Re: Nucular electronics - complete kit for ev! [beta]

:bigthumb: :bigthumb:
PITMIX wrote:
Mar 21 2020 6:44am
PS : couple in French is torque in English :roll:
In engineering, a couple is two equal forces which act in opposite directions on an object, but not through the same point, so they produce a torque. Couple=torque. :roll:
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by serious_sam
Mar 21 2020 5:13am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1231
Views: 127624

Re: Nucular electronics - complete kit for ev! [beta]

serious_sam wrote:
Mar 21 2020 5:08am
I'll see if I can find the reference
Here it is.
From here :
http://wiki.nucular.tech/en:controller-setup#toc8
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by serious_sam
Mar 21 2020 5:08am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1231
Views: 127624

Re: Nucular electronics - complete kit for ev! [beta]

controller tries to avoid to get damaged from that and so it slows you down until the voltage is safe. Very interesting. Did you get this info from Vasiliy or Nuc staff? In my understanding, the Nuc limits top speed in FW mode to ensure the back EMF never reaches dangerous levels. I'll see if I can...
by serious_sam
Mar 21 2020 5:05am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1231
Views: 127624

Re: Nucular electronics - complete kit for ev! [beta]

PITMIX wrote:
Mar 21 2020 4:43am
Torque sorry :lol:
Of course, couple=torque. Sorry, I should have recognised that!
by serious_sam
Mar 21 2020 5:01am
Forum: Battery Technology
Topic: bluetooth BMS?
Replies: 1320
Views: 161246

Re: bluetooth BMS?

Usefull. I agree with you to the extent that, as a tool to wirelessly give an approximate SOC for a pack sitting on the bench at home, it does the job. But as John indicated, it's really only good for a rested pack. For real-time SOC (i.e. while riding), I wouldn't bother with it. Even if the Nuc d...
by serious_sam
Mar 21 2020 4:39am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1231
Views: 127624

Re: Nucular electronics - complete kit for ev! [beta]

PITMIX wrote:
Mar 21 2020 2:23am
no I use the couple mode
What is the couple mode?
by serious_sam
Mar 21 2020 1:30am
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1231
Views: 127624

Re: Nucular electronics - complete kit for ev! [beta]

Are you using the "speed" or "speed/torque" control modes ? I had the same problem when using those modes. "Torque" mode works perfect though. I have 12F.

I'd like to be able to use those other modes sometimes, but it seems like an unuseable feature at this point in time.
by serious_sam
Mar 21 2020 12:26am
Forum: Battery Technology
Topic: BMS chip getting very hot
Replies: 16
Views: 399

Re: BMS chip getting very hot

Anybody find the wiring arrangement on this BMS a bit unusual? Put it this way, if I wasn't told that it's a BMS, I probably would never have guessed it. I'm curious about what's on the other side. Surely the sparse/random layout on the visible side is a result of things on the other side. At least...