Hello. I am working at a project which implies a 50Hz power transformer (150VA, primary 230V and secondary 24V).
For this project, I am using a computer power supply enclosure for the transformer and for the rest of the components.
When I power up the transformer the metal enclosure starts to vibrate.
Is someting that can be done in order to calcel those vibrations ?

 

1. A toroidal transformer would have less external field and so reduce the vibrations.
2. Use a non-ferromagnetic case.

 

.... just curious ...
What is the load on the secondary? 150 VA is not a great deal ... think a 150 watt light bulb. If it turns out that you are exceeding this amount of power, you may be over-driving the transformer.

 

The load is a soldering station, which uses a 48W/24V soldering iron. Also, there is a control circuit which reads the temperature of the soldering iron and turn it on and off accordingly.

 

3. Use a switch mode power supply.

 

... The load doesn't seem to be the problem. The power supply may have too many hours on it, and the transformer laminations will have gone through a life-time of thermal hot and cold cycles, becoming loose.

 

It could also be loose lamination's on the transformer, this can sometimes be cured by coating with winding varnish.
Max.