Magnet let loose on brushless rotor.

[lenny]

Hi,

I have a track star 10.OT 3900kv motor in a buggy,

And I thought it stripped a spur gear or the pinion gear came loose.

But all looked good when I took it apart to see.

Than I pulled the motor apart,

And found the magnet loose in between the end plates that are on the rotor shaft.

I think the glue bond just let loose from being to hard on the brakes,

But not really sure why it happened.

So I was going to try and fix it with some red thread lock,
By putting it in the groove between the magnet and plates.

Any one have this happen before with a motor ?

Thank for any input.

[srislash]

Haha, I was going to PM you to ask how that buggy was doing Len. You know, I remember somewhere someone having success with something to glue them magnets in. I think it was local.

Got any 638? The red would not do it for long I don't think.

[lenny]

Hey,
No I do not have any 638.
Maybe I will try a little JB weld or some other epoxy I have hear,
I see you are modding up a hatch for the bling rocket.

[srislash]

Hey,
No I do not have any 638.
Maybe I will try a little JB weld or some other epoxy I have hear,
I see you are modding up a hatch for the bling rocket.

Yup, gonna be awhile till it is warm enough to even attempt a swim.
Not sure what style to do though

JB should work, worst can happen is you have to redo at some point

[Fella1340]

We used to use epoxy on dc drives at work to get the junkets back up and running. I seem to remember using a non conductive type. Though they may have been paying for regular epoxy with a special label and higher price. Epoxy is the only thing I would use. These were large cnc machines that were pounder hard. Most repairs lasted my time there and beyond. Can't hurt to try.

[lenny]

Well I used a little of the red permatex thread locker #26250,
And let it dry over night good and put the motor back together and the buggy.
Than ran it on a 2s pack and all was good so far,
So I tried it on 3s and it's holding the magnet to the shaft and shaft plates still.
I guess will see how it holds up with the red TL.
I might grab one of those cc 4600kv motors in the swap shop to try in this to.

[srislash]

One of the 1410 3800kv's would be hot

[lenny]

This thing does 42 mph on 2s 30c 5000mah pack now,
And at 3s 55mph when it says hooked up.
Using 25 pinion/88 spur for 10 minute run on 3s motor temp is 120 and all else is cool.

Pm, (Thing).
Still not a wake yet.

[gsbuickman]

Wow, thats kind crazy when motors come apart .

Yesterday, l8rg8r had a traxxas velineon 7800kv 380 motor go souuth on him. Ricky was gonna run it in a modified 12th scale jetboat. The can let loose and slid off the armature, and the armature was free spinning on the main shaft .

Needless to say, its toast

[lenny]

Why toast ?
Can it not be epoxied back to the shaft again ?

[gsbuickman]

That was my first thought too. On closer inspection the windings are hashed from a screw being too long ....

[lenny]

Ok,
That's not good than.

[gsbuickman]

Yeah, I should think not

[Fella1340]

Good to hear the loctite is holdings. Probably another first. Awesome products. You can't go wrong when you have an arsenal of adhesives!

[lenny]

Yep something new to try it on for now,
I need to pick up some med CA to have on hand.
Because I find my self hot gluing a lot of my test setup.