How do I put this electric motor back together?!

[Naio]

Got my shave ice machine motor back from the repair guy. Started to put it on the machine. Turned the shaft and it was rough and clunky.

Since it was Christmas Eve, I decided to see if I could fix it myself. Opened the motor up, found that one of the permanent magnets had come unglued. After a quick Google, I sanded the interface and glued it down with J-B Weld, clamped it overnight.

But yes, in all this, I managed to lose track of which end had the brushes on it and which end was the shaft. There don't seem to be any markings to tell me. I'm also not a hundred percent sure that I got the magnet oriented right, although I am maybe 75% sure. Yes, it was a bad day.

So, at this point I'm hoping one of you retired engineer types can help me out. Again.

Does it matter which end the brushes are at?

Will I ruin everything if I have the magnet switched around wrong?

Sigh. Merry Christmas.

[Naio]

Also, in case this is a clue, when I turn the shaft by hand and let go of it, as it stops at wobbles back and forth. It does this whether I turn it clockwise or counterclockwise. Does this mean my magnet is flipped around?

I hope I get lucky and somebody who knows something is logging in 🙂

[Naio]

Okay, new question. Boy do I wish I had some clue what I was doing here.

When I put the motor together and turn it by hand, it has a sort of a scraping feeling. It doesn't have the clunking feeling it had when the magnet was loose.

When I open it up again, I can move the inside around to each of the four magnets, so I can tell that there is a little air space before each magnet like there ought to be. But I don't know if still maybe my glue was too thick... Is it okay to put it together and let it kind of wear in?

[Naio]

It's a DC permanent magnet motor. It has four magnets glued to the inside of the case.

[MrWizard]

Refresh my memory
Is this a DC motor connected directly to the battery,?
The there is a segmented commutater on the brush end
An A.C. Motor with brushes will have either that or a pair of " slip rings" like generators have

[alaska_dennis]

Thank you, Dennis :-). I did check the magnet, But whichever way I switched it around, it still attracted to both its neighbors.

How many magnets on case? For polarity maybe a compass more sensitive.

[midnightsadie]

well looks like we know what your getting for new years.

[Naio]

alaska dennis wrote:
Does it matter which end the brushes are at?
Yes if you can put it back together either way One way it will spin backwarks and if permanent is in backwards no spin. To check use another magnet and it should attract on one and repel on the other.

Thank you, Dennis :-). I did check the magnet, But whichever way I switched it around, it still attracted to both its neighbors.

[ksg5000]

If it were me I would return it the the "repair guy" and ask him to fix it properly.

[alaska_dennis]

Does it matter which end the brushes are at?
Yes if you can put it back together either way One way it will spin backwarks and if permanent is in backwards no spin. To check use another magnet and it should attract on one and repel on the other.