27.5” front 26” rear - Wheelbuilding

markz · Apr 26, 2021

Which Mxus motor?
XF40-45H is the 3000W motor thats 45H

You could probably get the same acceleration from other motors of lesser power so long as you dont want to dump huge amps into it for to long. You can dump a ton of power into a 1kw 9C generic clone, but only for a very short time. Probably better from a stand still then if the 9C was saturated already with power.
Dump power into the 3kw mxus for much longer. There is the hub motor weight difference, also the 3kw can store and shed more heat because it has more mass.

Eastwood · Apr 26, 2021

markz said:
Which Mxus motor?
XF40-45H is the 3000W motor thats 45H

You could probably get the same acceleration from other motors of lesser power so long as you dont want to dump huge amps into it for to long. You can dump a ton of power into a 1kw 9C generic clone, but only for a very short time. Probably better from a stand still then if the 9C was saturated already with power.
Dump power into the 3kw mxus for much longer. There is the hub motor weight difference, also the 3kw can store and shed more heat because it has more mass.

Yeah my last motor was rated for 1500w and I was going to burn it up, I had to keep a close eye on the temp. Was pushing 150 phase amps but the acceleration sucked so I was always smashing full throttle which caused me to heat the motor even more. With this new motor I can barely touch the throttle and get way more acceleration. I must’ve had something like a 2T winding or something similar. The old motor hit 50 mph so It had plenty of speed just no torque and no acceleration. Well acceleration was decent and I could pull away from cars because I was dumping 5.5kw into lol But yeah nothing impressive as far as what I would call real performance.

But this 1500w one won’t go to waste. I’m putting this on my other e-bike it has a 500W geared hub motor and I’m pushing way too much power to it lol so ultimately this motor will save the life of the 500w geared lol

Edit: oh and yes I believe that’s the motors specs
here’s a link to the seller I bought from
https://www.elecycles.com/mxus-3000w-motor-brushless-electric-bike-rear-hub-motor.html

markz · Apr 26, 2021

A 2T motor would be harder to get a controller that works with that motor, just like a 1.5T, 1T or 0.5T motor.
The search function doesnt work with 2 digits/letters.
I dont know the reasons why its more difficult to control those motors. Inductance, backemf, reluctance.... I got no clue.
I know some motors need a special controller. And some controllers have a range of motors they work best with.
Its probably because the 0.5T motor requires to much current and/or voltage.

Well I'll start off with this post
https://endless-sphere.com/forums/viewtopic.php?f=2&t=25956&p=375352&hilit=low+turn+count#p375352
https://endless-sphere.com/forums/viewtopic.php?f=30&t=25940&p=375003&hilit=low+turn+count#p376094
more good posts throughout the thread

Here is a good little read as well, probably deserves to be in the other threads talking about hub motors as well.
https://books.google.co.uk/books?id=jjuTYtKokc8C&printsec=frontcover&dq=fundamentals+austin+hughes&hl=en&sa=X&ved=0ahUKEwjlyNaWhZ_LAhVHthoKHaAuDtIQ6AEIJjAA#v=onepage&q=fundamentals%20austin%20hughes&f=false

Eastwood · Apr 26, 2021

markz said:
A 2T motor would be harder to get a controller that works with that motor, just like a 1.5T, 1T or 0.5T motor.
The search function doesnt work with 2 digits/letters.
I dont know the reasons why its more difficult to control those motors. Inductance, backemf, reluctance.... I got no clue.
I know some motors need a special controller. And some controllers have a range of motors they work best with.
Its probably because the 0.5T motor requires to much current and/or voltage.

Well I'll start off with this post
https://endless-sphere.com/forums/viewtopic.php?f=2&t=25956&p=375352&hilit=low+turn+count#p375352
https://endless-sphere.com/forums/viewtopic.php?f=30&t=25940&p=375003&hilit=low+turn+count#p376094
more good posts throughout the thread

Here is a good little read as well, probably deserves to be in the other threads talking about hub motors as well.
https://books.google.co.uk/books?id=jjuTYtKokc8C&printsec=frontcover&dq=fundamentals+austin+hughes&hl=en&sa=X&ved=0ahUKEwjlyNaWhZ_LAhVHthoKHaAuDtIQ6AEIJjAA#v=onepage&q=fundamentals%20austin%20hughes&f=false

Yeah and it might be a 3T but I’ve never opened it.

markz · Apr 27, 2021

Yeah but how can you tell what winding the motor is by opening the cover?
I doubt you can count each strand, but maybe you can with the windings leap frogging or count where the windings solder onto the phase wires. The windings I've seen are packed well in the teeth, but then the windings are moved over so you see a strand of winding wire moving from say 3 oclock to say 8 oclock (random #'s)

Unless you get lucky at its stamped or marked.
You could find the kv easy enough if you have the right equipment. Primarily a rpm counter you could get on ebay for cheap, then just fully charge your battery and do the calculations.

Eastwood said:
Yeah and it might be a 3T but I’ve never opened it.

Eastwood · Apr 27, 2021

markz said:
Yeah but how can you tell what winding the motor is by opening the cover?

Well from just reading stuff on here. I’ve never done it, can’t remember exactly how you count the windings without looking it up. Pretty sure it was on here or maybe YouTube or something.

But the good thing is with my new motor I’m sure its a 5T Because of the acceleration and torque. I was a little concerned of what winding I would receive but The seller did good! I was going to be hot if he sent me a 3T because I don’t need 70 mph Lol

I did some riding today a man with the battery fully charged at 84V it’s ridiculous, in a good way :wink:
I can’t imagine the QS motor with a 5T winding maybe pushing 350 phase amps

Or that death bike, that thing is a monster!

amberwolf · Apr 27, 2021

markz said:
Yeah but how can you tell what winding the motor is by opening the cover?

I only know when I see the handwritten marking on some of them, usually on the stator supports.

markz · Apr 28, 2021

Yes, that is the only super easy way to know.
Maybe the independent re-seller might know what the default wind count is for the motors they sell.
If you buy straight from the manufacturer then they should know, might even be on the paper work inside the box, or on the label.
Someone posted that Leaf will send out a default wind, 6T? or 7T? - I specified in my order what I wanted, but still havent confirmed.

My mxus 40-45H 3kw had a marking, I dont know if my Leaf 1500W had markings because I dont think I have opened it up... yet.
I know 2 or 3 of the smaller wattage generic motors I bought off ebay/yescomusa never had any markings for turn count or kv anywhere on the motor itself, outside or inside.

markz said:
Unless you get lucky at its stamped or marked.

amberwolf said:
markz said:

Yeah but how can you tell what winding the motor is by opening the cover?

Click to expand...

I only know when I see the handwritten marking on some of them, usually on the stator supports.

Chalo · Apr 28, 2021

markz said:
Yes, that is the only super easy way to know.
Maybe the independent re-seller might know what the default wind count is for the motors they sell.

Ultimately, it isn't turn count, but kV that matters. That's much easier to determine without disassembling anything.

markz · Apr 28, 2021

Super cheap, I should buy a laser rpm counter
https://www.ebay.com/itm/402559151095?hash=item5dba652bf7:g:SooAAOSwVTVfnaFx
Do you need special reflective tape or anything will do
https://www.amazon.com/Reflective-Tape-Optical-Laser-Tachometers/dp/B00DGTHDV6
Dollarama - https://www.ebay.com/itm/203299428633?hash=item2f55971919:g:9y8AAOSwQJlfpQUQ

Ianhill · Apr 28, 2021

Most smartphones slo motion will capture a hub motors rpm easily even with 240fps work out the roations over time them adjust it for the minute to give a rpm figure

Ive used it to determine wheel rpm and im sure there was room to capture even faster tyoes of motor, if i had a high end phone they do 1000fps that should give a way of working back to KV for anyride id place my arse/feet on.

Chalo · Apr 29, 2021

markz said:
Super cheap, I should buy a laser rpm counter
https://www.ebay.com/itm/402559151095?hash=item5dba652bf7:g:SooAAOSwVTVfnaFx
Do you need special reflective tape or anything will do

That's about the same as the one I have.

Any reflective tape, or even a white mark on a dark background, will do.

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