Which type of motor use in oil-free air compressor? And how to detect stall?
&quot;Any ideas how to detect or prevent stall? Can I just detect over-current using fuse...?&quot;
Electric motors generally pull their stall current whenever they are starting up. The fuse would need to be a slower-blow type. Otherwise you will be replacing fuses, or resetting circuit breakers all the time. However, you are constrained by not wanting damage to your motor, which might happen in a matter of seconds. A more robust solution might be to detect the current, either with a sense resistor, or a Rogowski coil, connect it to a timer, and if the over-current lasts too long, fire an SCR crowbar circuit to blow the fuse. This, however, would be significantly more work, and whether it is worth the trouble depends upon the value of reliability in your situation.