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Magnets - DC - HowTo???

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First! 😎

 

More later...

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19 minutes ago, 56Sierra said:

I find myself very attracted to this subject. 😉

I'm the polar opposite. 🙂

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My opinion reverses frequently on the topic.


Seriously I would like to know how to reverse the polarity of the magnets on my starter.

 

when i first bought the quad the starter would turn the engine and it would start. But then the brushes fried. I rebuilt the starter and it turns backwards now. All i can think is that the fried brushes reversed the polarity of the magnets. Is that possible?

 

OEM starter, OEM rebuild kit. I even took it to a battery shop. The guys didn’t mention whether the polarity switch was possible.

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2 hours ago, Goober said:

My opinion reverses frequently on the topic.


Seriously I would like to know how to reverse the polarity of the magnets on my starter.

 

when i first bought the quad the starter would turn the engine and it would start. But then the brushes fried. I rebuilt the starter and it turns backwards now. All i can think is that the fried brushes reversed the polarity of the magnets. Is that possible?

 

OEM starter, OEM rebuild kit. I even took it to a battery shop. The guys didn’t mention whether the polarity switch was possible.

Did you use a new brush plate?  I believe on a DC brushed motor it's possible to get them to run backwards by rotating the brush plate.  My brother and I used to race slot cars as kids and he figured out he could tune his motors by slightly changing the timing of the brushes.

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@56Sierra is right. There are two ways (three actually, the 3rd method requires reverse polarity magnetic field magnets though) to reverse the direction of a permanent magnet brushed DC motor.

As 56sierra mentioned the brush plate can be rotated to alter timing to produce more/less power/RPM, thus reverse the rotation direction as well. To reverse the motor direction without altering timing just swap the positive/negative brush leads.

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Yes thanks I installed all new brush plate kit and had motor turned. Maybe I misunderstood assembly. The plate has three mating points and doesn’t look like i can swap brush position. I’ll try again 

FF4C9DC0-281A-4A27-A64A-6033CE93C59F.jpeg

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reverse the wiring., if possible.. this just dont seem right..., or get new magnets.

Edited by LedFTed

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Try flipping the magnets housing end for end in case the locating tangs on each end are the same shape?

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9 hours ago, retro said:

Try flipping the magnets housing end for end in case the locating tangs on each end are the same shape?

I think you're on to something.   My Dad was a fork lift mechanic in a steel mill and he taught me to always index things before you took them apart.  He would scribe an X on one end and a straight line on the other end of a motor, generator or alternator.   Dad wasn't the most educated guy on the block but he had more common sense than half the people in town combined. 

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