Motor Needs Jump Start

[DoDo1975]

Hi,

One of my motors appears to need jump starting, and doesn't have much torque. If I give the gears a little help the motor runs fine. The motor will not rotate at all when the rotors are on.

I have checked the connections and voltage at the motor, which is fine, the problem is in the motor itself I suspect. Is there any way to fix these motors? The BR flew fine for a few weeks (20 + flights).

I suspect the motor is probably hooped, and was not up to the job.

[Kwok_Yu]

5 minutes x 20 flights = 100 munites. There are some reports of motors burning out after 100+ minutes. Especially, in the stock unlighten BR (that is still with the body). Also, is the motor, powering the lower rotor, the one that is not working. A limited number of replacement motors are available. Petter posted links in one of the recent threads.

That's why I am using carbon brushes instead of the stock wire fingers. And also using a heatsink. But I realize this is beyond the skills of many. I just mention it in case someone is interested in trying.

[petter]

Replacement motors.
If you have the posibility you should also check the resistance on the bad motor. It should be about 1.7 - 1.9 ohm (turn the shaft and take several measurements) if not it is an indication that the brushes are damaged. I believe that "Kwok_Yu" changed the end cap of his motors to get carbon brushes. If you want to replace the motor, you can get them here: http://www.pgoelz.com/

Petter