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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Magneto charger magnetizer


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  #11  
Old 02-05-2019, 10:13:18 AM
landreo landreo is offline
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Default Re: Magneto charger magnetizer

Changing the electrical polarity will change the magnetic polarity. Did you use a voltmeter check the polarity of the wires where the power supply connects to the magnet wires?

It is possible to remagnatize your compass if held too close to the charger which may give the impression that the field polarity did not change.

It will be interesting to see what you determined is really happening.
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  #12  
Old 02-05-2019, 07:05:37 PM
eddie bedwell eddie bedwell is offline
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Default Re: Magneto charger magnetizer

Hi Team,
back in the mid 1960's at The Cat Dealer as an apprentice I used to re-charge magneto magnets with DC voltage from a 24V battery pack used to start big Cat Diesels.

To my not very electrical mind I would think the AC voltage would change the charger pole polarity every half cycle and confuse heck out of the magnet--possibly discharging it.
I do stand to be correct by smarter electrical and magnetic minds.
Cheers,
Eddie B.
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  #13  
Old 02-06-2019, 12:08:54 AM
neonman neonman is offline
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Default Re: Magneto charger magnetizer

Lister-man did mention that he powered the charger from mains using a rectifier, which should be sufficient to keep from demagnetizing anything. I have wrecked a perfectly good compass by leaving it too close to an electromagnet. I'm still puzzled by the previous post that mentioned not being able to detect a change in polarity of the magneto charger when the + and - were reversed. That can't really happen if DC or rectified AC is used. Unless the rectifier is bad, passing AC to the magneto charger.
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  #14  
Old 02-10-2019, 06:10:32 PM
lister man lister man is offline
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Default Re: Magneto charger magnetizer

I checked the rectifier with multi meter and it is showing a dc current as it recognises a + and - but it still does not switch the north and south poles when you switch the wires on rectifier.

So i went back to my 12v battery and reversed the wires on the battery and it does switch North and south poles as expected. Maybe my rectified 240v is not giving a clean signal, the rectifier was a full wave one, maybe i have a bad one???
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  #15  
Old 02-11-2019, 08:36:50 AM
oldgoat oldgoat is offline
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Default Re: Magneto charger magnetizer

Depends whether you switched the AC input or the DC output wires.
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Old 02-11-2019, 11:03:40 AM
Ronald E. McClellan Ronald E. McClellan is offline
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Default Re: Magneto charger magnetizer

Quote:
Originally Posted by oldgoat View Post
Depends whether you switched the AC input or the DC output wires.
****************** I was wondering when someone would discover that loop hole. Ron
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  #17  
Old 02-14-2019, 04:40:49 PM
lister man lister man is offline
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Default Re: Magneto charger magnetizer

It was the DC wires on the rectifier that I switched
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  #18  
Old 02-27-2019, 04:07:43 PM
barry ayres barry ayres is offline
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Default Re: Magneto charger magnetizer

are both coil wound in the same direction?
think we need to see a diagram of how its wired.
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  #19  
Old 03-11-2019, 04:54:06 PM
lister man lister man is offline
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Default Re: Magneto charger magnetizer

Landreo was right my compass got magnetised so was getting a bit confused
All sorted now and working properly .

Is there any consequences if magneto magnet polarity gets reversed?
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  #20  
Old 03-14-2019, 05:05:39 PM
barry ayres barry ayres is offline
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Default Re: Magneto charger magnetizer

probably not so long as its saturated as most mags produce alternating sparks any way (ie 1 & 3 positive and 2 & 4 negative thats the order of sparks produced not cylinder numbers) ideally you want all negative but very few multi cylinder mags do.
out of interest what current does your charger draw? i hope to get back to building mine soon it should theatricality draw 22A on a 240V rms supply.
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