I have disassembled the motor controlling circuit for my refrigerator. I am trying to understand how it works, so I hopefully reduce the start surge-current and make it work with my 1000w inverter. Currently the fridge sometimes draws 1100w on start, othertimes only 600w.
The fridge is brand new, high-efficiency, "BEKO" with a Donper AG100CY1 compressor.
I've checked the circuit a hundred times, and it really is like this:
But it seems to go contrary to what I've read about refrigerator controller circuits.
- The start winding is permanently connected (normally it would be disconnected after start, e.g. by a PTC)
- The run winding is current runs via PTC at start, then via capacitor once hot
My main surprise is that the surprise winding is permanently connected.
(And additionally, I am hoping to add a start capacitor...)
Why isn't the start-winding disconnected? Does this make any sense?