I’ve got this 48V 10.4A generic chinese switching power supply to power my mini lathe’s controller and stepper motors.
The two steppers draw when working just 1.5A max each. And the controller 0.5A.
This supply turns on its loud fan a couple of minutes after it’s on and never turns the fan off, even if the steppers/controller are in standby mode.
The supply’s vendor told me the fan is not temperature aware, so it stays on forever.
I wired a small temperature control circuit to turn the fan cooler on and off depending on the temperatures inside the supply.
But I noticed that the more it stays on, and when powering actively the steppers, this toroidal coil (don’t know its proper name) heats a lot. It slowly got to almost 120º C. In the picture I attached a temp sensor to this coil, to turn on and off the cooler.
But with a laser thermometer, i checked the temps of most components and nothing ever reached 50ºC, but this coil gets too hot.
The supply works normally, outputs it’s 48V properly, the lathe works normally.
Is it normal for this component get so hot?? Is there anything I can do to fix it?
Thanks for reading]1
The output choke measures 40mm diameter, aprox. 23 mm width, the hole measures 12mm aprox. The wire is 1mm thick and appears to be three wires wired in parallel. It’s green core is not one whole unit, but two half width kept together by the wiring.