7XL Getting Hot

[giftacrylic]

When I hit the forward throttle after using the brakes, it goes backwards.

[coolhandcountry]

I don't know what to say on that one. That is a first I have heard. That would seem to be in the esc more than the motor. Have your tried another esc on that motor. Maybe the esc is running out of time and making the motor run hot.

[squeeforever]

Try to reprogram it.

[giftacrylic]

I have re-programmed the controller. Why is my motor getting burning hot?

Check your motor bearings also. You can check it by hand spinning it. It should feel real smooth and should spin freely. Also check for any side to side movement of the shaft.

Another possibility, Any chance contaminates have gotten into the motor?

[SpEEdyBL]

It's possible that the rotor is out of balance. I had this happen to my 380c 9t. It must have been whacked out of balance when the motor fell apart in bad crash. When my 380c 9t began to run hotter all of the sudden, I did some inspecting and found that the rotor was way out of balance. The epoxy was now on the wrong side of the rotor. Even when I rototed the epoxy holding aluminum plates 180 degress at the ends of the magnet, the rotor would still roll to one side when placed on a table. The shaft wasn't bent, but somehow the distribution of mass inside rotor must have changed. I don't know if this is the case with your motor, but it did make my 380c 9t run quite bit hotter. Be sure you rule out your esc first though.

[coolhandcountry]

Hey speedy did you make sure there was no metal screws in the table where you was testing.

[giftacrylic]

I have decided to purchase another system. I run 14-16 cells, should I get the MGM Compro 160 amp or the BK Electronics 12020 Warrior Controller? I will probably stick w/ a 7 or 8XL motor.

[coolhandcountry]

Well after running my mgm. I would say get the mgm for up to 16 cells. It is a hard esc to program but is real smooth. for run time the 8xl would go longer.

[giftacrylic]

What do you mean by smooth?

[MetalMan]

He means that the low-end throttle is less likely to cog with the MGM compared to the BK.

[squeeforever]

You might want to consider the Quark controller.

[SpEEdyBL]

Originally Posted by coolhandcountry

Hey speedy did you make sure there was no metal screws in the table where you was testing.

Yes I did. The rotor is so out of balance that you can even roll it on your fingers and it will still role to one side all the time. I'm going to add a whole bunch of epoxy to see if that solves it.

[SpEEdyBL]

Edit: It turns out my rotor wasn't out of balance at all. The rediculous amount of epoxy that I put on one side of the rotor, did nothing at all and I began to wonder. I found out that the earth's magnetic field was pulling one side of the rotor down towards the ground, since the balance point slightly shifted depending on which direction the shaft was pointing (North or South). I guess rotor balance is not the issue after all for feigao motors.