Thread Tools
Dec 07, 2011, 08:55 AM
Registered User

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?
Sign up now
to remove ads between posts
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
diy motor tipsDrive Calculator
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.

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion The basics of building RC aircraft motor where rotor is permanent magnet? pecamuzicar Electric Motor Design and Construction 6 Oct 21, 2011 09:40 AM
Discussion Permanent magnet motors effective winding? mir_as82 Electric Motor Design and Construction 8 Jul 30, 2011 08:06 AM
Discussion Commercial motors with lowest kV^2*Rm (ie magnet strength/air gap) almson Electric Motor Design and Construction 18 Sep 22, 2009 03:59 AM
Discussion Started autopsy on motor. Stator & magnet gap question. BlazerB52 Electric Motor Design and Construction 20 Aug 02, 2006 07:36 PM
Magnet Air Gap vegasprostreeter Power Systems 7 Mar 25, 2005 12:31 PM