Small motor overheat
on HVAC evap fan motor
at 120 Vac no load motor overheat then feedback pulse stop working
5178 pulses / min divided by 4 = 1294.5 rpm shall turn at 1350 + - 20 rpm
what make the motor to overheat ?
the unit had a power surge when lightning
can it be saved ?
Discussions
8 years ago
# 12 is best answer
jma123
8 years ago
Answering the heating portion.
This is a fan motor and when used as designed, it funnels some air
across the motor body, enough to cool it so it can run longer then 12min.
Japanese are savvy motor engineers and know a motor design is
cheaper if you use less copper and iron which makes it run hot without
the surmised cooling airflow.
As far as taking the motor apart, could it be done with a pin wrench ?
Answer 8 years ago
I did pry out metal cap at the sensor end and stuff came out
look like a Hall sensor feedback ? but not sure
metal ring look smooth ? must have magnetic parts into it to generate pulses
?? I get 4 pulses per rev
see pictures enclosed
This is it good for a throphe or garbage
Answer 8 years ago
Right you are, try a paper clip, compass or Magne-View Film to confirm
there are magnetic poles on the shaft ring where the sensor sits.
8 years ago
To Iceng & Steve
THIS IS IT ....DONE WITH THIS ONE
THANKS
JMA123
8 years ago
Without the starting cap, its not likely to reach synchronous speed, so the rotor lags too much behind the field in the stator, and overheats.
Steve
8 years ago
+1 is the very unofficial method we use to approve an answer from someone
8 years ago
It HAS to have a capacitor, probably 2uF or so between the heavy black and white wires, and power applied between red and black.
Steve
8 years ago
This is it is the beastie is it ?
Does it smell burned at all ? There doesn't look like any obvious way in
When you tested it, did you use a capacitor ?
Steve
Answer 8 years ago
+1