Lightest 3kw hub motor

[rewinch]

What is the maximum voltage you can push into a 7T MAC geared hub motor (7T should have approx. 10kv)? For a burst of 5+20 seconds. Basically I need ~40 Nm and 900 rpm. (would a BMC be better?)

Other DD hub motors or geared that can perform 3kW at the lightest weight possible..?

 

[cwah]

Mxus v3? But its 9kg lol

 

[rewinch]

Yes the MXUS is a good choice and saves ~2 kg compared to the cro'. (especially the 12kv "3T" version).

I guess it is impossible to remove any weight of significance from the MXUS3000...Or?

"
3T:
Max. Continuous Phase Current: 55A
Overheat in 10 Minutes: 85A
Overheat in 60 seconds: 242A
"

Maybe some mini-MXUS 3000 would be best way to save even further weight as this one can apparently take 242A for 60 seconds...


Could http://www.crystalyte.com/SAW series.htm be a candidate?

The mac geared 7T is around 4.0kg and the Cryst-400-series is 5,5kg. Question is if they can deliver like a cro for 25 seconds @88.8v nominal (40 amps)

 

[John in CR]

Why are you worried about "lighest" ? I understand and appreciate low weight, especially with 100-200W or so of power available from most cyclists legs, but once you to electric as the primary drive a few kilos makes such a tiny difference that with good pack placement it's irrelevavant to the th actual puilt.

 

[amberwolf]

Why are you worried about "lighest" ? I understand and appreciate low weight, especially with 100-200W or so of power available from most cyclists legs, but once you to electric as the primary drive a few kilos makes such a tiny difference that with good pack placement it's irrelevavant to the th actual puilt.

maybe cuz it's not for a bike, but for a light winch?

i'd think a few kilos might make a difference between a light winch and a heavy one.

I'm experimenting with building light winches for wakeboard/snowboard application.

 

[999zip999]

What's a 3kw motor is this rated or max ?

 

[rewinch]

Max (and still be alive) and should work for a 25second burst (then motor rest for 2 minutes and repeat 25second burst)..

 

[999zip999]

Thr Cro motor was to heavy ? The muxus 3,000 is in group buy maybe get one 240.00usd shipped. Not much lighter. I'm thinking direct drive for durability. Run then forward or reverse. Maybe leaf 1,500 more money than a muxus 3,000 group buy. But must hurry. May be closed ???

 

[macribs]

Check with Justin, IIRC they are soon selling a new lightweight hubmotor. With a 20mm thru axle. Nice weight shavings done there. Flanges are machined down between spoke holes, the steel back iron between the flanges is milled down to absolute minimum. Resulting in a net weight less then 4 kilos.
I think they are releasing those motors any day now.

Take a look at http://www.ebikes.ca


https://www.youtube.com/watch?v=ljoA8xznXb0&t=0m22s

 

[Samd]

Just buy the mxus 28mm, same laminations and virtually the same as the new 9c that justin is releasing. 20mm thru axle is a distraction for most.
6.3kg.
Use the temp sensor and monitor.

It seems very similar to this, but a rear motor.
http://www.ebikes.ca/shop/ebike-parts/motors/m2706fd.html

 

[spinningmagnets]

For a winch?...the reason for getting a bigger hub is continuous high amps, and avoiding saturation (which is IN-efficient). Its a toss-up...Leafbike 35mm with no aluminum stator-support (to act as a "heat sponge"), or MXUS 1000W 28mm with aluminum stator support. I'm guessing they both weigh near the same. Maybe get a Leafbike with some "stator aid" to avoid wasting battery Ah on waste-heat?

MXUS 3000W can do this without sweating (according to what I've read), so...is it that much heavier than the Leafbike/MXUS 28mm V3 ?

 

[Samd]

About 2.9kg heavier.

i think the winch comment was just random one though? Or is he really building a winch?

 

[amberwolf]

He has edited his original post, but this is what he stated before doing that:

I'm experimenting with building light winches for wakeboard/snowboard application.

 

[Samd]

Gotcha.


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