retro   3,221 Posted May 3 First! 😎  More later... Share this post Link to post Share on other sites
56Sierra   707 Posted May 3 I find myself very attracted to this subject. 😉 2 Share this post Link to post Share on other sites
sled_22   721 Posted May 3 19 minutes ago, 56Sierra said: I find myself very attracted to this subject. 😉 I'm the polar opposite. 🙂 3 Share this post Link to post Share on other sites
jeepwm69   3,975 Posted May 3 NI!  I mean "IN!" 3 Share this post Link to post Share on other sites
Goober   1,074 Posted May 8 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. 1 Share this post Link to post Share on other sites
PROV Â Â 834 Posted May 8 I have no idea but cannot pull myself away from this topic. 1 Share this post Link to post Share on other sites
56Sierra   707 Posted May 8 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. 2 Share this post Link to post Share on other sites
retro   3,221 Posted May 8 @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. 2 Share this post Link to post Share on other sites
Goober   1,074 Posted May 8 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 1 Share this post Link to post Share on other sites
LedFTed   608 Posted May 9 (edited) reverse the wiring., if possible.. this just dont seem right..., or get new magnets. Edited May 9 by LedFTed Share this post Link to post Share on other sites
retro   3,221 Posted May 9 Try flipping the magnets housing end for end in case the locating tangs on each end are the same shape? 2 Share this post Link to post Share on other sites
56Sierra   707 Posted May 9 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. 3 Share this post Link to post Share on other sites
