Motor is slowing down over time

Support
1

Hello.

I’m using a gymbal motor MAXON 200142 which is performing a back and forth movement (position control loop), the problem is that it is gradually slowing down and after 20 minutes of operation ( arund 120 movement cycles) it stops without triggering any errors. The temperature of the motor has a variation of about 35 °C (form 30 °C to 70°C max).
And the mosfet’s temperature is also around 50°C max.

My question is what safety features form the software can cause this behaviour? Where can I read more about current/temperature limits?

2

Sometimes if the encoder isn’t quite tight, this can happen.

3

Thanks fot your response.
That would be the case for an external encoder, right? But we are using bult-in hall sensors.

4

I had that problem when the batteries were not able to supply enough current over time and like you I did not get any errors. After a recharge and batteries with a better C rating it worked fine so far at least, so I think I fixed the problem.