I made another current measurement iteration. This time waiting some ten minutes for each voltage step and see where the current value sets.
4 210 190 24
5 260 230 30
6 310 265 37
7 360 300 43
8 410 330 50
9 460 350 61
10 510 370 70
- Voltage / V
- Current cold / mA
- Current hot / mA
- Calculated temperature rise / C
We could accept the temperature rise of 70 degrees Celsius with 10 volts in room temperature. That would make 95 C degree in 25 C room temperature but professional equipment must be designed for extreme violent conditions. Direct sunlight may cause some 50 C degree ambient temperature.
9 volts and 50 C ambient temperature would mean 111 C winding temperature. That is absolute maximum in extreme conditions. That is fully acceptable.
Motor windings can take temperatures above 150 C but there are other parts inside the motor made from unknown materials. Anyway the cooler, the longer life.
We are not going to write a software that keeps the motor pulling at full force for hours. No, we are not, but we are professionals and we have to consider extreme conditions and situations that can be caused by a malfunctioning component, in hardware or software.
We can keep keep the previous voltage plan and feel safe.