Re: Why do stepper motors lose their magnetism when disassembled? and a dc treadmill motor ?

It must be a temperature cutout switch. I read nearly zero ohms at
rest. I took the switch out of the motor and took my hot air gun and
heated the sensor. In a few seconds the ohm meter read an open
circuit.
After I removed the heat source the circuit closed and the read 0
ohms again.
Dan

--- In CAD_CAM_EDM_DRO@yahoogroups.com, David Speck <Dave@...> wrote:
>
> Dan,
>
> You could determine by experimentation. See how much resistance
across
> the blue wire pair. Put a voltmeter across the blue pair, and see
if a
> voltage is generated when you spin the shaft by hand.
>
> Apply power to the "other" wires, see if motor spins. See if there
is a
> voltage on the blue pair when the motor is turning.
>
> If motor doesn't turn with voltage on the "other" pair, you may
have a
> DC motor with separate field and armature circuits, in which case
you
> would connect the black and blue sets either in series or parallel.
>
> Do you know how the motor was wired in the original treadmill, or
did
> you buy the motor as a loose unit?
>
> Dave
>
> danmauch wrote:
> > In tread mill motors what are the two blue wires for? I think
they
> > are either for a magnetic pichup for rpm or a temperature sensor
but
> > am not sure. Anyone know what they are? I hate to take the motor
> > apart just to see.
> > Dan
> >
>