kubark42
1 W
- Joined
- May 15, 2020
- Messages
- 61
In theory, and somewhat in practice, a motor's power limit is determined only by its ability to (1) keep cool and (2) not fly apart under centrifugal loads. I want to know how to apply theory in order to determine on a case-by-case basis how to push a motor past its published specs.
Assuming I have an appropriate gearing system and a constant torque load, then I can place the peak RPM anywhere I'd like. And assuming some combination of increased voltage-- or even rewinding a motor-- I can achieve any RPM. And assuming I can apply the appropriate cooling through enhanced airflow and perhaps even exotic phase change cooling, then I can keep the motor within operating temperatures. So what are the practical limits in overdriving a motor?
For instance, T-motors sells the new V10L motor, which although spinning the test prop it made 50% less power than I need, it has class-leading heat capacity and weight. It's fair to think that, since the system has a demonstrated 11Nm of torque at 6kRPM, one could run it up to 9kRPM, giving a 50% bump in performance.
(High RPMs aren't as crazy as one might think, LMT motors can run at 50kRPM, and the Dyson cordless vacuum motor reportedly runs at 80kRPM.)
I understand that there are no magic bullets and if all we needed to move a container ship was a tiny 80kRPM motor then we'd already be doing that. I'm not looking for a free lunch, and am instead hoping to expand my understanding of motor manufacturing and performance.
Thoughts?
Assuming I have an appropriate gearing system and a constant torque load, then I can place the peak RPM anywhere I'd like. And assuming some combination of increased voltage-- or even rewinding a motor-- I can achieve any RPM. And assuming I can apply the appropriate cooling through enhanced airflow and perhaps even exotic phase change cooling, then I can keep the motor within operating temperatures. So what are the practical limits in overdriving a motor?
For instance, T-motors sells the new V10L motor, which although spinning the test prop it made 50% less power than I need, it has class-leading heat capacity and weight. It's fair to think that, since the system has a demonstrated 11Nm of torque at 6kRPM, one could run it up to 9kRPM, giving a 50% bump in performance.
(High RPMs aren't as crazy as one might think, LMT motors can run at 50kRPM, and the Dyson cordless vacuum motor reportedly runs at 80kRPM.)
I understand that there are no magic bullets and if all we needed to move a container ship was a tiny 80kRPM motor then we'd already be doing that. I'm not looking for a free lunch, and am instead hoping to expand my understanding of motor manufacturing and performance.
Thoughts?