Servo problems

Other Hardware General Electronics
1

I'm using two FS5106B hobby servos with an Arduino Uno. They were both working fine except they would hum and vibrate continuously the moment I plugged them in. But they still rotated per the code.They both are connected to individual 6 volt battery packs for power. THe arduino has its own power supply. I would like to know what to do to get rid of the hum.

Recently though, one servo stopped rotating properly. I removed it from power and tried to rotate it by hand and its not moving properly even by hand. I am going to replace it with a different servo but I'm worried that what caused the hum is what is causing the servo to die and the same thing may happen to the new one as well.

Any suggestions on what might be happening will be really helpful.

Thank you.

2

The hum is normally caused by the servo "hunting", this is due to the resolution of the feedback pot in the servo. One way of trying to prevent it is to define the position in terms not of angles but in microseconds. Experiment to see if you can find a "sweet spot" position where it doesn't hunt.