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Old Nov 08, 2009, 12:28 PM
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Joined Nov 2009
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Rewind brush to brushless motor(HELP!!!)

I have a brush dc motor(100w) and I wanted to make it a brushless one. I started unwinding motor 60% left to unwind. When done I wanted to do a wye wiring with the winding ABCABCABC.

Will this work?

It's 12 stator(about same diameter of water bottle) and as 2 ferrite magnet(i think, there black instead of silver).

I don't understand any other windings, so I stuck with this right now.
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Old Nov 08, 2009, 02:11 PM
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pilotpete2's Avatar
The Northeast Kingdom, Vermont
Joined Jun 2004
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I don't think you can just rewind a brushed motor to convert it to BLDC. In a BLDC motor the windings are stationary, allowing the power to be connected without using brushes, commutators or slip rings. In a BLDC motor the magnets do the rotating.
Pete
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Old Nov 08, 2009, 04:13 PM
pushing the envelope
rcgroupie's Avatar
USA, CA, Los Angeles
Joined Jun 2005
533 Posts
Quote:
Originally Posted by pilotpete2 View Post
I don't think you can just rewind a brushed motor to convert it to BLDC. In a BLDC motor the windings are stationary, allowing the power to be connected without using brushes, commutators or slip rings. In a BLDC motor the magnets do the rotating.
Pete
I think it could work 'outrunner' style. Bolt the shaft to the plane...
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Old Nov 08, 2009, 04:49 PM
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North East England UK
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A standard brushed motor only has 2 magnet poles....Can you post up a picture of the motor?
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Old Nov 09, 2009, 05:16 AM
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Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
He already posted - it has two magnets.

Sorry, can't use that.
..a
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Old Nov 09, 2009, 06:21 AM
Ulf Harmason
Joined Aug 2009
111 Posts
Quote:
Originally Posted by nak25 View Post
I have a brush dc motor(100w) and I wanted to make it a brushless one. I started unwinding motor 60% left to unwind. When done I wanted to do a wye wiring with the winding ABCABCABC.

Will this work?

It's 12 stator(about same diameter of water bottle) and as 2 ferrite magnet(i think, there black instead of silver).

I don't understand any other windings, so I stuck with this right now.
The expression "wind up" springs to my mind
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Old Nov 09, 2009, 08:11 PM
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Joined Nov 2007
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To make a bldc motor out of the stuff you have is possible but the learning curve is pretty long. It is way more complex then a simple rewind. Also you will need some basic machine tools, lath, drill press, etc.
The best way to start is to get a good motor theory book.
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Old Nov 10, 2009, 01:47 AM
We want... Information!
Bruce Abbott's Avatar
Hastings, New Zealand
Joined Jan 2001
5,182 Posts
Quote:
Originally Posted by nak25 View Post
I wanted to do a wye wiring with the winding ABCABCABC.

Will this work?

It's 12 stator
ABCABCABC won't work unless you have 8 or 16 magnets. For other windings schemes see this Winding Combination Table. A popular combination with 12 stators is 14 magnets and LRK (A-b-C-a-B-c) or DLRK (AacCBbaACcbB) winding.

For more help I recommend the RC Groups Electric Motor Design and Construction forum.
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