Hi, I hope someone can help ...
I've got a 240v AC motor which keeps blowing the 13A fuse after running for about 2 seconds. I'm no expert on AC motors, but I'll give you what I can.
The application is a V-twin 10cfm air compressor. I can't see any rating info on the motor - it's integral with a V twin pump, but I'd say it's the size and power of a washing machine motor. It is brushless, so the only windings are those of the stator assembly. It also has a 40 micro-farad run(?) capacitor.
I've removed the stator assembly and visually inspected it. I've also connected it directly to the mains in its 'removed from the motor' state in an attempt to rule out any issues arising from overload or its in-series pressure-switch cut out. The behaviour is exactly the same - it blows the fuse after ~2 seconds. I retried the test with the capacitor disconnected, but the behaviour was exactly the same.
I've measured the DC resistance of the complete assembly (i.e. from the live to neutral connections), and it's giving me a reading of about 25 ohms. I don't believe that the field windings can just 'go bad', so could it be the capacitor? My experience of these is that when they fail the motor just hums, but this one clearly runs albeit very briefly.
Any help would be gratefully received.
I've got a 240v AC motor which keeps blowing the 13A fuse after running for about 2 seconds. I'm no expert on AC motors, but I'll give you what I can.
The application is a V-twin 10cfm air compressor. I can't see any rating info on the motor - it's integral with a V twin pump, but I'd say it's the size and power of a washing machine motor. It is brushless, so the only windings are those of the stator assembly. It also has a 40 micro-farad run(?) capacitor.
I've removed the stator assembly and visually inspected it. I've also connected it directly to the mains in its 'removed from the motor' state in an attempt to rule out any issues arising from overload or its in-series pressure-switch cut out. The behaviour is exactly the same - it blows the fuse after ~2 seconds. I retried the test with the capacitor disconnected, but the behaviour was exactly the same.
I've measured the DC resistance of the complete assembly (i.e. from the live to neutral connections), and it's giving me a reading of about 25 ohms. I don't believe that the field windings can just 'go bad', so could it be the capacitor? My experience of these is that when they fail the motor just hums, but this one clearly runs albeit very briefly.
Any help would be gratefully received.