Small wheel hub motors

ESK8 Electronics
101

Thats the bell not the stator actually the bell is 59mm diameter even if the motors are named 63xx

102

I’m not sure if sk3 does it the same as most but that should have a 74mm long. But if I remember right it isn’t. Can u measure. It’d be interesting to know how u do with a single. It might be comprable. Maybe some math with ur bigger diameter wheel and bigger motor matching up with my smaller diameter wheel and smaller diameter motor at 47 instead of your 53

“6374” motor probably has ~5045 stator (-it is 86mm long overall)". And they’re 60mm overall as said so the actual stator…I think it’s almost always a cm less so a 50mm stator diameter

So I read

Rather have more motor than fan

103

I can measure them the next days, have them in my workshop.

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104

To custom motors makers, do you know good magnets suppliers?

Also how do you fix them to the rotor, glue?

105

For that, I suggest you contact a company that produces rotors. I know of several Chinese companies, but you’re better off NEVER SPEAKING TO THEM UNTIL YOU HAVE A PATENT. Also probably after because they’ll ignore your IP rights because they can.

If you find a good one USA side that doesn’t charge several thousand, I’d appreciate the info.

106

Thanks for the tips. I think I will go with supermagnetman for the prototyping phase. And manufacture different parts in different Chinese companies for full production.

107

@jacobbloy Sorry to bring you to this thread, but seeing your motors makes me wonder what are the advantages of a 21 or 24 slots stator over a standard 12 one? Also considering the fact that I’m aiming for a 3620 stator for this small hub, to minimise heat, maximise efficiency, get about 400W max P and get 18 mph max (59mm wheels), what are your advices?

108

I would recommend you will only get a 18slot stator that small and in that size a stator with more slots is going to lower your strand count so increase heat.

It is a fine line before you go big. Smallest stator I would recommend would be 40.6mm

I can help you get a 36mm 18slot 0.2mm lamination or a 39mm 18slot 0.2mm lamination or a 40.6mm 24slot 0.2mm lamination

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109

are you going to wind them yourself? getting stators is harder and more costly than getting motors made.
do you have any pics? 3620 is tiny. with one motor you will burst into smoke. You could do the 59mm wheel if you make it really long.

i think a 24 slot vs a 12 is almost the same power as its the same amount of copper and iron but i think it is less prone to cogging at really slow speed. 12x14 or a multiple is a pretty magical number for power I think. not necessarily efficiency but power. I vaguely remember something about it.

for such a small wheel you could do an inrunner for the skate hanger. it would spin the axle and have one wheel fixed and the other on bearings and floating on the spinning axle. there’s a lot more potential motor room in a fat hanger than in a 3620. you could have your small wheel and with some decent power. one motor no redundancy. swappable wheels. similar to the lagrange drive system with it’s floating axle. always wanted to make that. the torque out of an inrunner isn’t as good as outrunner but if you make it long enough you could get there. definately better than that little stator. and then your tires will run cool! not complications there. real regular wheels.

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I don’t advise inrunners. Not enough torque. Look at Stary - they struggle to climb intense hills and you can REALLY hear that gear set churning.

@brams Does supermagnetman also make rotors?

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@Hummie Yes, for me I don’t think inrunner is a good option, I can’t have a long stator.

@anon94428844 I don’t think supermagnetman is selling any rotors, it’s really a magnet specialist.

Also, what should be used for fixing magnets to the rotors? Epoxy?

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i want have this gearing!

113

Def epoxy. You can design a clip mechanism that locks the magnets in position around the rotor, but it won’t replace epoxy.

114

stary dont use an inrunner it’s a little outrunner with a planetary gear.

brams if you try to use the little stator you mentioned it will be super under-powered. U will not have a max speed on a flat of more than maybe 5 mph and that’s if you were to push it to speed. Thats a guess but…way under powered and all the problems associated with that.

115

Oh good catch. The rotor is actually not connected the way I thought it was.

116

Hey do you still use this forum? I would love to see those cad files!

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Did you ever do this? Did it work?

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