Brushed motors are fun

[Ritz413]

So I have a couple brushed motors hanging around. Like this 1...

It's a 21t, 3 pole 540. And this is what it looks like on the inside

And after I started removing the wire

The old wire

The new wire

All wound up minus soldering for best conductivity

Gotta take the spring tension off the brushes to get the end bell back on

With a motionless masking tape flag

And

Still 21t, just way faster. Fun is

 

[Ritz413]

While it has the same number of turns the smaller diameter is approx. 27% less wire. Making it behave like a 17.5t if wound with the original wire

 

[Lucifur10]

Soooo...what's the brake disc off of? Oh and cool motor rebuild.

 

[Ritz413]

Soooo...what's the brake disc off of? Oh and cool motor rebuild.

This is where the rotor comes from

 

[Ritz413]

Got some new wire coming tomorrow so I can mess around with my sr27 motor.....it's soooo tiny....aaahhgg,lol

 

[BustedAw11]

I havnt seen folks rewind brushed motors since around 2005-2006...

I still do it, but commonly people newer lack the skill, knowledge or effort.

I used to build my own hot rod motors back in the day vs always buying them. Definitely a super fun and rewarding skill to have

 

[Ritz413]

I havnt seen folks rewind brushed motors since around 2005-2006...

I still do it, but commonly people newer lack the skill, knowledge or effort.

I used to build my own hot rod motors back in the day vs always buying them. Definitely a super fun and rewarding skill to have

I started rewinding tiny 2 pole slot car motors way back. Sometimes I get the itch to keep those old skills in practice. I put this in the sandmaster 2.0. Brought it out in the dark for a minute. Feels nice and smooth. Needs some gearing that favors the bottom end a bit more. Looks like it should be a good time!

 

[Ritz413]

Now that the light has come back I should use a different battery and retest. I grabbed the first thing with enough v to run a quick test.. 20c is probably a bit light

 

[Ritz413]

New testing at full charge with a 5000mah 100c battery. Still think I would like to drop the pinion maybe 2t for a little better launch, but it's gonna be good! New top speed.

And for the dedicated rtr crowd who wants no part of rewinding motors....here's a pot of Mexican black beans enhanced with pork sausage.

I know some of you miss the food pics from yer fb days. Look at me embracing modern times trying to be inclusive.

 

[BustedAw11]

Swapping armature bushings for bearings.. We used to cut slots in the brushes back then for less friction too . The good ol days

 

[Ritz413]

Swapping armature bushings for bearings.. We used to cut slots in the brushes back then for less friction too . The good ol days

This motor already had bearings out of the box

 

[Ritz413]

I put the stock gear ratio back in. Better off the line top speed of 23, compared to the stock motor at 18.

 

[Ritz413]

Here is the newly wound motor in the kyosho sandmaster 2.0 on a carpet track ....which it's not set up for. But why not...

 

[Ritz413]

Been a minute since I have worked on anything this small....

 

[Ritz413]

This is not the stock sr27 motor. It's a generic silver can....that we now know was a 60t 3 pole motor with .006 wire...

Not anymore...

For anyone who has not had success rewinding motors....most often it's this...

The fun colors your wire comes in is an insulating enamel coating....strip it off at any contact point if you want it to work.

 

[Ritz413]

All buttoned up. Gotta make sure to mark it so I know which 1 has been modified.

The next tip for success doing this is to make sure you are using solder meant for electronics and not for plumbing or craft work.

 

[WickedFog]

Swapping armature bushings for bearings.. We used to cut slots in the brushes back then for less friction too . The good ol days

We used to do that with slot car motor brushes. There was a guy with a 24th scale rail dragster that he had around $400 wrapped up in. It was a work of art, and an absolute blur on the track. The motors most of us ran were little 2 pole Wasp motors if I remember correctly.

This whole thread reminds me of Electricity shop class. 6 whole weeks to wind a coil, bend some metal, attach it to a board, and see who could make the loudest buzzer in class. My buddy Chad, that meticulous SOB, barely beat me by just a smidge in volume, but mine sounded a lot cooler, and had a helluva spark. I think I almost made a decent welder out of it.

Cool thread man! Keep going. This stuff brings back memories!

 

[Ritz413]

We used to do that with slot car motor brushes. There was a guy with a 24th scale rail dragster that he had around $400 wrapped up in. It was a work of art, and an absolute blur on the track. The motors most of us ran were little 2 pole Wasp motors if I remember correctly.

This whole thread reminds me of Electricity shop class. 6 whole weeks to wind a coil, bend some metal, attach it to a board, and see who could make the loudest buzzer in class. My buddy Chad, that meticulous SOB, barely beat me by just a smidge in volume, but mine sounded a lot cooler, and had a helluva spark. I think I almost made a decent welder out of it.

Cool thread man! Keep going. This stuff brings back memories!

Think I got something really good with this 1. When I originally installed this motor I had to go from a 9 to a 6t pinion to get a better launch. This sounds great on the bench and is back up to an 8. We might have a winner!!

 

[Ritz413]

Grabbed a couple 3 pole 11t external brushed motors today. Cause I don't have any 550 can to play with. https://www.injora.com/products/inj...1-10-rc-crawlers-inm09?variant=43749507825951
if you're looking to have a go at this stuff, $8 is a good deal,and 550 can wont require a magnifying hood like the 1 i just did.

 

[WickedFog]

While it has the same number of turns the smaller diameter is approx. 27% less wire. Making it behave like a 17.5t if wound with the original wire

So I don't remember much about electronics class. But I know the wire we used to make the buzzers was super thin stuff. So what is the benefit of going with the smaller wire on your motor? Less weight? Would that not dik with the torque, the magnetic field, etc?