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Forum Index : Microcontroller and PC projects : Torroid Transformer question
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| Godoh Guru  Joined: 26/09/2020 Location: AustraliaPosts: 378 |
I bought a dead 8kw Powerjack inverter. It had been butchered by the previous owner when he tried to repair it. So I pulled the Transformers out ( 2 of them) and used them in two new 8010 based inverters. I noticed that the transformer in one that I use all the time was running hot. So I had a look and found that there was a steel band around the outside of the torroid, I removed it and also put some small blocks of perspex under the bottom of the transformer to allow better airflow. This seems to have fixed the heat problem. My question is does anyone know why powerjack would put an insulated steel band around the transformers in the first place. To me it seems like adding a shorted turn to the transformer and also a way of preventing heat dissipation from the windings. Maybe it is so that the two transformers would not get tangled up magnetically but I am sure that some of you cluey folk will know. Pete |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5695 |
Does this help? I suspect you are seeing what is labelled as a GOSS band, wrapped round the outside of the windings. The ends are shorted, but it isn't a shorted turn. It reduces stray flux. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Godoh Guru Joined: 26/09/2020 Location: AustraliaPosts: 378 |
Thanks Mick, I had a bit of a search and read, it seems that shielding is used on things like audio gear to prevent hum etc. It makes the transformer run a lot cooler without it. So GOSS band begone. Thanks for the reply Pete |
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