Author Topic: B-H Conversion "Winmoo"  (Read 1369 times)

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adaml

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B-H Conversion "Winmoo"
« on: May 26, 2011, 10:32:52 AM »
This is another Brooks-Hansen (Brooks Crompton) 7.5hp AC Induction motor conversion attempt.  Why I started is another question that I have not yet found the answer to.



It has a 15cm rotor and I was aiming for eight flats, four pole, IRP using ¾” x 3/8” N38 round magnets.



Having no metal work skills or tools it was a hand hacksaw job, an exercise I suppose just to see if it could be done.  On numerous occasions I wished I had not started, hard graft!

However, after several weeks of “nibbling” away I did eventually managed to cut off enough to give something resembling eight flats.



56 of the magnets were attached with Plastic Weld.



I have not had a chance to do any real data gathering yet, hopefully this will follow.  The limited testing I did showed cut in for a 12V system to be about the 200rpm mark and at 300rpm approx 3A.  There was little sign of cogging which was a surprise, especially as I had managed to keep the air gap much smaller than in previous attempts where cogging had been noticeable, possibly I just got lucky with the “skewing” of the magnets due to my poor workmanship?

It has been flown with an 8' wood blade set seeing 6A but unknown rpm.  This was somewhat frightening so am thinking that a smaller, possibly 6' would better suit.

I don't think this has been a waste of time although I was hoping to see better output, further testing will tell but it has proven that a rotor can be hacked up without machining tools and still produce some power.


Being thick I am struggling to insert pictures so don't know if they will show up.  I will try again if not!
« Last Edit: May 26, 2011, 11:02:58 AM by adaml »

TomW

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Re: B-H Conversion "Winmoo"
« Reply #1 on: May 26, 2011, 10:54:42 AM »

adaml

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Re: B-H Conversion "Winmoo"
« Reply #2 on: May 26, 2011, 11:00:08 AM »
Thanks Tom, beat me too it!  Think got pics sussed now?!

SparWeb

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Re: B-H Conversion "Winmoo"
« Reply #3 on: May 27, 2011, 12:19:41 AM »
Congratulations Adam, you've created another monster.

Don't be disapointed - you've shown what can be made with the simplest of means (and some elbow-grease; who needs an exer-cycle?  Or a pedal-generator for that matter.)

It is going to run pretty fast though.  You can't give it too much blade or you'll need to rely on furling to keep it under control.

PS:  3.5 kW=5HP. 
No one believes the theory except the one who developed it. Everyone believes the experiment except the one who ran it.
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