MXUS and MAC wonders

Electric Motors and Controllers
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izeman   10 GW

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Re: MXUS and MAC wonders

Post by izeman » Mar 18 2017 8:48am

kdog wrote:Jcr
Is that true!? If so you may have just cleared up a long standing question of mine. A long time ago when I still believed in torque and speed winds (well ok it was only a few yrs ago and I was set straight by the hugely educational thread here on ES), my mate had two macs one fast one slower. His fast wind would always hit thermal roll back on his home hill so he bought a slower one (at my recommendation :pancake: ) and got up ok..hot but ok. A few weeks later I learnt more about motors but I've never known why he had his results... Till possibly now.
no it's not true. i have several MAC (from within the last years) with several windings and they all differ. they use thicker and thinner copper, and the copper fill is almost the same on all motors i have.

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tomjasz   1.21 GW

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Re: MXUS and MAC wonders

Post by tomjasz » Mar 18 2017 4:10pm

Recumbent Bicycle Source wrote: So can anyone here verify if there truly is a quality difference, better clutches, better wiring, better halls?
Neptronix has posted some comparison on ES Facebook. I haven't looked here. I went MAC because of all the positive reviews from long time users. AND the pricing. I will also be buying a Bafang Mini, that will come from Grin with their controller.
Thanks Justin_le we're here thanks to you. All the best to the mods for their tireless work keeping it on an even keel.

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spinningmagnets   100 GW

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Re: MXUS and MAC wonders

Post by spinningmagnets » Mar 18 2017 4:31pm

It's my understanding that the thinner laminations are most beneficial to builders that are running higher RPMs, due to the reduced eddy - current waste heat. There is also significantly reduced cogging, but that only affects DD hubs, since geared hubs freewheel.

Since all geared hubs have a poor heat-shedding path, the way to higher power is usually going to a lower Kv (higher turn-count), and then raising the volts, since the option of higher amps would cause more heat. Builders using 60V or 72V will likely find the extra cost to be worthwhile.

2000W when using 72V is 27A, and at 60V it is 33A...both are realistic amp-limits if caution is taken (add a temp probe). If you can keep the gears from getting hot, they can take more abuse.

I don't know of anyone that added ATF to a hubmotor, and didn't have an occasional drip on the ground, however...ATF is proven to work for capping the internal heat, by bridging the hot stator, and connecting it to the aluminum sideplates for much better heat-shedding.

A MAC will likely remain the best front motor for a hot rod 2WD system, since Doctor Bass posted that 2000W on the front wheel is a reasonable max to avoid excessive slippage. The rear motor could be another MAC, or a large DD hub

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tomjasz   1.21 GW

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Re: MXUS and MAC wonders

Post by tomjasz » Mar 18 2017 4:35pm

After a few lines of criticisms that will have no effect on how I use the MAC, this comment convinced me to save the $ and go MAC.

" MAC[sic] 0.27mm performace.. i am sure it whoops the ezee i bought."
Thanks Justin_le we're here thanks to you. All the best to the mods for their tireless work keeping it on an even keel.

ccgarnaal   1 mW

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Re: MXUS and MAC wonders

Post by ccgarnaal » Mar 12 2018 6:48am

So after reading trough this.
I think I'm going to build a dual MAC 6 T 20" for my fast cargobike.
Bicycle in question: https://www.yubaeurope.com/en/bikes-add ... upermarche

But the MAC 6t in a 20 inch rim at 48V is still just 41km/h And I would like to hit 45km/h reliably.
Thus I am probaly better running a higher voltage.
Could I run a higher voltage trough the controller that comes with this kit: https://em3ev.com/shop/upgrade-mac-ebik ... zontalTab2
Or do I need a different controllers?

I would combine the controllers with the cyclanalist shunt and throttle and pas connected to cyclanalist.

Other suggestions?




Original thread: https://endless-sphere.com/forums/viewt ... 2#p1364062

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tomjasz   1.21 GW

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Re: MXUS and MAC wonders

Post by tomjasz » Mar 12 2018 2:15pm

ccgarnaal wrote:
Mar 12 2018 6:48am
So after reading trough this.
I think I'm going to build a dual MAC 6 T 20" for my fast cargobike.
Bicycle in question: https://www.yubaeurope.com/en/bikes-add ... upermarche

But the MAC 6t in a 20 inch rim at 48V is still just 41km/h And I would like to hit 45km/h reliably.
Thus I am probaly better running a higher voltage.
Could I run a higher voltage trough the controller that comes with this kit: https://em3ev.com/shop/upgrade-mac-ebik ... zontalTab2
Or do I need a different controllers?

I would combine the controllers with the cyclanalist shunt and throttle and pas connected to cyclanalist.

Other suggestions?
Use the motor simulator....http://www.ebikes.ca/tools/simulator.html
Thanks Justin_le we're here thanks to you. All the best to the mods for their tireless work keeping it on an even keel.

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