"Brian" wrote in message
...
I've got a hotpoint washer / dryer that isn't rotating the
motor. So I'm hoping to find a hotpoint or motor
expert who can help me..

So heres an interesting puzzle for you -

The motor says on it AC motor for electronic speed control,
1 phase. (904/1153/10). This is UK 240v.

snipped
Thanks in advance.
Brian.


The speed control circuit board may be duff. These motors are controlled by
pulsed voltage from a circuit board positioned on the casing somewhere.
Usually near the top of the machine to keep them from getting wet in a leak
fault. The motor only gets full voltage, no matter what speed it's meant to
be running at, but the voltage is pulsed so makes the motor surge, slow,
surge, slow and so on and so on. and this keeps it at a steady speed.

Connections to the motor are for mains voltage and tachometer coil. The
mains voltage is obvious, but the tachometer works by detecting the motor
speed from a spinning magnet which is fixed to the end of the armature. The
faster the magnet spins, the more it effects the tachometer coil, the more
the control circuit board pulses the voltage.

Take a look at the circuit board and see if it has signs of overheating on
it. This is most noticeable near the black thing with three wires coming
from it, and is most likely fitted to a bit of metal to dissipate the heat
it generates away from it. The other place overheating can be seen is near
quite large black cylinder shaped components that have a silver or white
stripe at one end. These control the pulsing times for the mains voltage to
the motor, and they can boil over time.

One test you can do, but be very careful when attempting it, is to wire a
bit flex cable with a plug on it to the motor. You've already traced out
where the connections for motor are, so make these connections and test the
motor works outside the machine. Then you'll know it's control board that's
duff for sure.

Place the motor on a wooden board, and keep the socket where the plug goes
well within arms reach so you can switch off quickly. A 5 Amps fuse in the
plug is enough for this test. Place a foot on the motor in case it jumps
around when you apply the mains to it. That Centrifugal stuff can be a
bitch sometimes.

It's the only other thing I can think of to make sure of what part is gone
tits up on you.

Good luck with it.