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Hollow Bore Motors, Friend or Foe?


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Your point is correct if the balls are the same diameter in both bearings. To my knowledge, they are not. I would imagine they are far larger in the hollow bearings..but then we are talking dubious Chinese design here...so I will use that as my get-out if I'm wrong ;)

 

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22 hours ago, Wei Zhong said:

The extra rotations of the balls would directly correlate to shorter lifetimes of the bearing

For wearing out, sure. But currently the bearings in hollow bore motor EUCs are failing as soon as in just a few rides. Getting the bearings to last as long as the natural wear would enable would be a magnificent leap forward from the current situation.

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  • 3 months later...
On 7/21/2021 at 5:50 PM, Asphalt said:

Not saying that Begode reads these forums, but it looks like they finally came to their senses.

I would say it's commendable they experiment:innocent1: Even if the experiment (or their version of it) fails. Given that IM has gone with a traditional axle on the V12 vs. the hollow motor of the V11, I would say Begode/Gotway aren't the only ones that learned a lesson.

In theory, a hollow motor could save weight (nothing instead of the motor stator spokes) if the big bearings don't negate the weight savings. And they could offer extra space on the inside that could be used for whatnot. So I'm a bit sad it seems the hollow motors are over, but at least the manufacturers tried.

The "mini hollow motor" new Begode motors are the best of both worlds imho. Better than an axle (more robust), not as susceptible as the big bearing hollow motors, even though the latter would be cooler if they worked.

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I wonder if this smaller hollow design has an effect on torque. I love the torque on my RS HT!

My bearings have been fine, lots of dusty off road and 1100 miles down. I avoid water like it's an allergy though. 

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5 hours ago, Flying W said:

I wonder if this smaller hollow design has an effect on torque. I love the torque on my RS HT!

My bearings have been fine, lots of dusty off road and 1100 miles down. I avoid water like it's an allergy though. 

Bearing size shouldn't have any effect on torque.
Torque will be influenced by stator-rotor radius, wire thickness, stator windings, and magnet size, as well as voltage and current.
 

Edited by Asphalt
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11 hours ago, RagingGrandpa said:

Let's see if they improved the bearing fit this time around... but it sounds like the huge-diameter boutique (expensive) thin-shell bearings from the RS/EX.N/MonPro are being phased out.

Well this change to a much smaller version of the "Hollow Motor" might mean that the EX suspension model also gets phased out from the line-up too?

There is Absolutely No Way GotWay/Begode will be able to retrofit/re-engineer that cumbersome, clunky, travel limited air suspension into these New motors!

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9 hours ago, fbhb said:

Well this change to a much smaller version of the "Hollow Motor" might mean that the EX suspension model also gets phased out from the line-up too?

I totally forgot about the EX suspension that needs a big hollow motor!

Might very well be the EX.N is the new standard EX now. Or they come up with a different suspension design (please just copy KS).

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9 hours ago, fbhb said:

Well this change to a much smaller version of the "Hollow Motor" might mean that the EX suspension model also gets phased out from the line-up too?

There is a re-design happening for the EX. I was informed that the units would start shipping in mid to late fall. I pulled my pre-purchase after receiving this news LOL. 

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On 7/27/2021 at 6:58 AM, Asphalt said:

Bearing size shouldn't have any effect on torque.

It does have a small effect. Friction torque in the bearing is friction coefficient times force times bearing radius. Doubling bearing size doubles friction torque.

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On 7/27/2021 at 11:04 AM, meepmeepmayer said:

I totally forgot about the EX suspension that needs a big hollow motor!

Might very well be the EX.N is the new standard EX now. Or they come up with a different suspension design (please just copy KS).

An EX with kingsong style suspension would be a dream.

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11 hours ago, I_Must_Bust said:

An EX with kingsong style suspension would be a dream.

Like this? :P

3C8ADC65-CDEE-4EA6-9911-087F5407BFC9.thumb.jpeg.46ec5b137757a9da25a9465c55a062e3.jpeg

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On 8/5/2021 at 10:33 PM, I_Must_Bust said:

Where's that image from? Looks cool but probably heavy

Someone shared it in the Inmotion Telegram chat. WrongWay also showed it in his recent EUC rumors video.

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