Does anyone have an idea whats wrong with this MM motor (VIDEO) - RC-Monster Forums

Desert Rc

This motor stopped working and this is what I get when forward and reverse is applied. I have not ran into this before and when I hooked up my medusa it works correctly on same esc. I tried resetting the esc to no avail.

bruce750i · 11.02.2009, 04:47 PM

How freely does it spin by hand?

Desert Rc · 11.02.2009, 04:54 PM

A little play in the shaft in and out by one or two millimeters....lol. That doesnt sound good.
Spins freely and smooth as when new. This motor has only seen two Lipo Packs in runtime. And the shaft play is the same as when new. I have had quite a few mamba motors but this is new to me. I could send it back but sure would like to fix on my own.

bruce750i · 11.02.2009, 05:08 PM

Double check the solder connections. Have you mounted it yet? Did you mount it with too long of screws possibly? check firmware for updates? Brushed mode? recalibrate to radio?

Desert Rc · 11.02.2009, 05:14 PM

radio works fine and the esc is otherwise working fine. I did an update to reassure all setting correct. Motor screws were correct. The solder connection were a concern of mine too. I checked the bullets and they are solid. I dunno about the ones that go into the can. I have yet to crack a mamba motor open. I can say that in testing the motor wires heat up quickly, if this helps at all.

Desert Rc · 11.02.2009, 05:16 PM

bullet connectors are solid welds still

Desert Rc · 11.02.2009, 05:56 PM

Does anyone recognize what this might be related to or have any suggestions on how to fix??

suicideneil · 11.02.2009, 07:21 PM

Weird. That looks like the issue peeps were having with the 1.22 or whatever it was update for the esc- try it with the newest version or an older version if possible. Do you have another esc or motor try the motor & esc with?

Desert Rc · 11.02.2009, 07:53 PM

I do actually Neil I will check it out. I was hoping you would chime in. I have yet to update my firmware as last time I did it removed the program and I had a biotch of a time getting it loaded again on my vista running laptop.

I will check it on another esc. Lol. didnt even dawn on me since the other motor it works fine with.

Desert Rc · 11.02.2009, 07:59 PM

Ya same results. The wires to the esc from Lipo got quite warm and the wires to the motor got warm also. It acts as if someting is binding but spins freely in the hand. Also this esc had a older firmware version on her as it has been sitting for a bit.

suicideneil · 11.02.2009, 08:20 PM

I would say it has a shorted or damaged phase within the motor based on that info- if another motor works fine on that esc, then 'tis the motor to blame. Castle should take care of it for you assuming it is a damaged phase, just so long as it wasnt self inflicted by using mounting screws to long- but that should be more or less impossible with the MMM motors as they have a shield inside the motor at either end to prevent such damage.

What motor is that anyway, hard to make out in the video?..

Desert Rc · 11.02.2009, 08:55 PM

Well the sheild is untounced as far as the motor screws go. I know castle will take care of me as they always have. I actually have a esc that needs going back as well....maybe I i will trade up for a MMP. It just sucks that I barely got even a day of runtime outta it. BTW its a 5700 that was being run in the new HPI blitz. On the positive note the Blitz is way more durable then my sc10s lol. It handled the power quite nicely.

BrianG · 11.02.2009, 09:02 PM

Those symptoms are not what I was seeing with the faulty 1.23 firmware. That looks like a phase is not firing right. Could be the motor itself (splices between the coil wires and the noodle wires inside the motor), solder connections, or ESC.

Desert Rc · 11.02.2009, 09:44 PM

Well I feel pretty confident that the esc and firmware are fine due to my troubleshooting with other motors. The solder maybe the cause but moving all the wires while checking things seemed to yield no difference in performance. I do believe something jarred loose internally. It did quit running after a pretty hard landing though the truck was fine and the motor can had no scarring.

BrianG · 11.02.2009, 10:03 PM

Quote:

Originally Posted by Desert Rc

...I do believe something jarred loose internally. It did quit running after a pretty hard landing though the truck was fine and the motor can had no scarring.

That's a pretty big piece of information there! It's one thing when something just starts acting funny out of the blue, but when it starts acting up after an event like that, I definitely would suspect a mechanical failure.