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Going Brushless

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Going brushless?

Going brushless?

JOHN PARKER with some practical advice

Len Morris 104/12/2014 19:23:35
295 forum posts
259 photos

Excellent informative article. In a nut shell BM's are just very small 3 phase motors which have been around in industry for ages. Rotates the wrong way, simply swap 2 leads, it rotates the other way, job done. What is really interesting is that I've been involved in the engineering industry for many years and never seen an industrial outrunner. Do they exist?

Len

Alan Hazel06/01/2015 20:20:01
3 forum posts
3 photos

Hi, I have the larger of the wooden Perkasa MTB and wanted to put a outrunner brushless motor in it and would love to know which would be the best one to use and speed controller to match.

Many thanks

Alan Hazel

Geoff Sleath11/01/2015 16:14:42
67 forum posts
18 photos

Len, I think outrunners are a fairly new idea. I'd never come across them either until relatively recently.

I struggled with heavy brushed 400 and 600 size motors in model aeroplanes and only had success with motor assisted gliders. Then suddenly rare earth magnets in outrunners appeared. Initially they were very expensive and needed even more expensive speed controllers but they've become really cheap in the past 5/10 years. Coupled with light Lithium Polymer batteries they've transformed electric flight to the point where there are more electric models on the flight line than glow or petrol powered.

The advantages of compact light weight motors and batteries isn't such a big deal for model boats, particularly scale, but I guess it'll come eventually.

Geoff

Len Morris 122/01/2015 22:15:09
295 forum posts
259 photos

Hi Geoff,

I think Colin has found a marine 'industrial' outrunner. Have a look at the Magnetic Thruster thread.

Len

Amy jane September23/01/2015 08:42:57
avatar
551 forum posts
515 photos

Hi Len

No doubt some one will correct me if I'm wrong, (and that's just fine...) but as far as I can see the Fisher and Paykel washing machine motor is a large out runner.....(And make jolly good generators, mine will put out over 400 watts, at less than 800rpm).

Amy j

Edited By Amy jane September on 23/01/2015 08:43:20

Len Morris 126/01/2015 21:30:16
295 forum posts
259 photos

Hi Amy,

I think you are right. Never heard of Fisher and Paykel here in the UK but checked out their site and yes they are into the new direct drive technology for washing machines and dryers etc. Looks like the middle of the motor is attached to the (static) frame of the machine and the outside casing is attached to the rotating drum. That's an industrial outrunner in my book. Well done!

Len

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