Permanent Magnet Brushed Motor Air Gap ? - RC Groups
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Dec 07, 2011, 08:55 AM
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Permanent Magnet Brushed Motor Air Gap ?


I have 4 kind of rotors. 12V and 24 V max 250 W Brushed DC Motors.

1- 42 mm diameter lamination
2- 55 mm diameter lamination
3- 65 mm diameter lamination
4- 81 mm diameter lamination

how many centimeter must be air gap between magnets and rotor lamination ?

Anyone inform me about this subject?
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Dec 08, 2011, 05:09 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
The smaller the gap, the lower Kv and the higher eddy current losses.
Gap is usually anything between 0,2 and 0,5mm

Vriendelijke groeten Ron
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diy motor groupCumulus MFC
Dec 08, 2011, 09:20 AM
Registered User
but i thought that smaller air gap is more useful.... Am i wrong?
0,2 mm - 0,5 mm is total airgap between rotor and magnets? Or just one side?
I mean in radius 0,2 mm or in diameter 0,2 mm?
Dec 11, 2011, 07:34 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
The trick is to find the correct trade-off for your application, that's what engineering is about.
Always measured on one side, distance between statorpole and magnetpole.


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