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Forum Index : Electronics : Old F&P rotor types -differences?

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domwild
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Joined: 16/12/2005
Location: Australia
Posts: 873
Posted: 07:14am 26 Apr 2011
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Hi,

Just cleaning out the garage and looking at my collection of old rotors. Am finding two types: The ones with larger magnets and fewer of them (obvious!) and the other type with smaller magnets.

Questions:
Is one type better than the other one? Smoother waveform with more magnets?

Thanks.
Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up.

Winston Churchill
 
Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 5116
Posted: 07:24am 26 Apr 2011
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I have a suspicion the old rotors with the individual magnets are slightly stronger than the newer rotors with the four magnets combined into one block. I do remember hearing something about F&P going for the combined magnet because it made less of the whine noise on the spin cycle, but I could be totally wrong.

I do have some of the old and newer hubs in boxes in storage, I should use my gauss meter ( shameless plug intended ) and measure the magnet strength of the different types.

Glenn
The best time to plant a tree was twenty years ago, the second best time is right now.
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domwild
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Joined: 16/12/2005
Location: Australia
Posts: 873
Posted: 10:36pm 26 Apr 2011
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Thanks, Glenn.
Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up.

Winston Churchill
 
Bryan1

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Joined: 22/02/2006
Location: Australia
Posts: 1450
Posted: 08:48am 27 Apr 2011
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G'day Glenn,
Good idea to use the ugn3503 as a gauss meter, I made a simple circuit using one of them years ago for testing N-S poles. All I used was a nimh battery I got from oatleys a green led and resistor and the hall effect sensor.

With putting the poles in on my 4kw motor conversion I didn't need that circuit as the strength of the magnets told me if I got the poles right. Once I got all 21 magnets in one pole I couldn't get the opposing pole within 2" of it. I did find out the hard way when one get the pole wrong a split magnet and luckily none in my finger.

Cheers Bryan
 
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