Suggest 48V 1000W hub motor & efficiency > 90%

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Hamidoouu   1 µW

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Suggest 48V 1000W hub motor & efficiency > 90%

Post by Hamidoouu » Feb 21 2019 5:22pm

Hi All,
I need help to find the best manufacturers which sell 48 v 1 kW brushless gear-less hub motor with peak efficiency more than 90%.
Any suggestions ? :roll:
Last edited by mark5 on Feb 21 2019 6:02pm, edited 1 time in total.
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markz   100 GW

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Re: Suggest 48V 1000W hub motor & efficiency > 90%

Post by markz » Feb 22 2019 6:47pm

Leafbike.com is your source for a top quality direct drive hub motor.

I am editing this to add the merch from YESCOMUSA (LINK) however I have no clue about the efficiency aspect.


Then there are these guys https://ebikes.ca
and https://em3ev.com/shop/?prod_cat_=hub-motor-kits-motors


Lunacycle
http://ebikessf.com/
https://ballaratebikes.com/
MXUS Official - https://mxus.en.alibaba.com/?spm=a2700. ... 6473xTcdZg

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neptronix   100 GW

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Re: Suggest 48V 1000W hub motor & efficiency > 90%

Post by neptronix » Feb 23 2019 12:09pm

leafbike is the only company i know of who has published a dyno graph on any DD hub motor showing >90% efficiency in the 1500w motor.
Real world testing on the motor thread has confirmed it's capable of doing that.

YescomUSA is just an average mid quality clone of a clone motor and it's very unlikely to have excellent efficiency because low cost is the priority with those.

QS motors tend to be a little less efficient than average, probably due to copper end turn losses.
MXUS motors tend to be average, peaking in the upper 80's but never hitting or exceeding 90%.
The old cromotor was said to be very efficient but we don't really have dyno graphs on those.

It is unfortunate that there is nothing better than the leafbike 1500w in terms of hub motor efficiency. The leaf peaks at ~90.7% efficiency but with another, i dunno, $25 USD in materials, it could probably hit 92-93%.

Nobody out there in the DD hub world seems to care about efficiency much. Unfortunately the cutting edge designs are often found in shaft drive motors for cars, motorcycles, RC airplanes, 'n such.
Efficiency is everything :bolt:


My first major build: 8T MAC motor on a Trek 4500.
The new all-arounder: Leafmotor 1500w on a Turner O2 full suspension.
The monster scooter: ? on a Cannondale Semi Recumbent.

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spinningmagnets   100 GW

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Re: Suggest 48V 1000W hub motor & efficiency > 90%

Post by spinningmagnets » Feb 23 2019 12:23pm

I'm sure that there are many things that go into making a particular motor model more efficient. However, one of the main design features is to use a thinner stator lamination.

The common "affordable" direct drive hub motors use a 0.50mm thick lamination. The Leafbike motor uses a 0.35mm thick lamination. The next step would be 0.27mm, but doing that is rare.

When the motor gets hot, the efficiency goes down. Therefore, it is beneficial to choose a design that can remain only warm under the hardest part of your user-profile, rather than occasionally getting hot. The Leafbike 1500W has a 35mm wide stator and magnet-set, and it provides more torque from the same watts, compared to a similar design of motor that only has a common 28mm wide stator and magnet set.

Choosing a higher Kv and then specifying a smaller diameter rim will help efficiency and lower heat, for a given top speed.

markz   100 GW

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Re: Suggest 48V 1000W hub motor & efficiency > 90%

Post by markz » Feb 23 2019 9:45pm

More mass of the motor dissipates more heat, along with using ferro fluid, could even install some alum fin heat sinks between the flanges, or vent the cover plates but then you couldnt use ferro fluid.

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madin88   100 MW

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Re: Suggest 48V 1000W hub motor & efficiency > 90%

Post by madin88 » Feb 24 2019 3:04am

I came across Aotema brand and want to bring this up here beacause the description reads like it would be better than the "average".

https://www.aotema.com/dealer/index.php ... ucts_id=83

Unfortunately they do not list specs like stator width, wire size or which size of steel laminations they use, yes not even the weight!

flat tire   100 kW

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Re: Suggest 48V 1000W hub motor & efficiency > 90%

Post by flat tire » Feb 24 2019 5:46am

90%+ efficiency is going to be very hard to come by in mass market ebike motors. I don't have anything to add to the Leaf discussion, and the only other 90%+ efficient motors I know of are the Astroflight lineup.

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