I have a treadmill incline motor that is blowing its circuits fuse every time it starts to run. This is the motor that lifts the treadmill up and down.
The motor is labeled: Output: 65W Input 36VDC Current: 3A Speed: 3700 RPM Torque: 1.7KG-CM
I tested the voltage off the board and it's correct per the manual. I have visually inspected the motor, taking the commutator out and it looks OK. I've performed the 3 tests (180 degree resistance, bar to bar resistance and bar to stack) here: http://www.groschopp.com/how-to-check-a-motor-armature/
Everything seems ok.
I did some other "cowboy" tests, which I doubt the validity:
- I hooked the bell end (end with brushes, I think it's called bell end) to the board by itself. It's still an open circuit and sure enough the fuse stayed fine. No surprise. I left the bell end hooked up and I put the commutator in, alone without the housing.
- With the brushes contacting the commutator the fuse immediately blew when voltage was applied.
The resistance across for the 180 degree test was 2.5 ohm. That resistance doesn't work with the watts and voltage.
Is this motor bad? Shorted out somewhere? Or am I missing something?