3 ms·
What about dryer motors? I mean, I don't much care what rpm the dryer runs at, but it should change speed with the grid frequency right?
by satiric 2y ago
What about dryer motors? I mean, I don't much care what rpm the dryer runs at, but it should change speed with the grid frequency right?
- kencausey 2y agoI wonder if resistive heating devices like ovens which have a tuned temperature component would become systematically less accurate if the frequency changed significantly.
- smallmancontrov 2y agoNah, the thermal time constant is a low-pass filter on the order of .01Hz, all of the line frequencies in this thread are waaaay higher than the control loop bandwidth. The loop would never notice the substitution. You might be able to trip up a fancy soldering iron where loop bandwidth is intentionally maximized, but I still suspect the first thing to go would be the magnetics on anything with a transformer.
- exmadscientist 2y ago> first thing to go would be the magnetics Yes, but not for the reason you'd think: 50 Hz magnetics have to be physically larger to work (peak flux density for a given current is higher), and magnetics are so big and heavy that they're not designed with much margin. So 60 Hz transformers will often not work at all at 50 Hz, and 50 Hz transformers will sometimes perform pretty badly at 60 Hz (though also sometimes going this direction works fine).
- bluGill 2y agoModern dryiers are generaly run on a phase converter so while the motor is ac the frequency is controlled by a computer.