wrote:


l have come across quite a number of refrigerators that has inverter
for its compressor motor these days. The problem is these compressors
will not work when connected to 50 or 60HZ mains. Please can someone
give me an explanation on how these circuits work, how to test both
circuit and compressor?


** So called "inverter compressors" employ BLDC motors in place of induction motors. This allows for variable speed and less heat loss in the motor.

Such motors are normally 3-phase with a rotating magnet providing the output torque. The drive circuits are quite complex and use high voltage MOSFETS
or IGBTs.

Search using " inverter compressor BLDC motor" and you will get more info.


..... Phil