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

Hamidoouu

1 µW
Joined
Feb 21, 2019
Messages
1
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:
 
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.details.cordpanyb.1.13ed6473xTcdZg
 
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.
 
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.
 
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.
 
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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