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Build own transformer - how to design a transformer - basics

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  • #31
    398216 Usunięty
    Level 43  
    arturavs wrote:
    Note, however, that such luck works casual.
    If such welded cores were ONLY in microwaves, then you would be 100% right. Unfortunately; many audio amplifiers also have a welded core. It is only about the fact that the production of such a transformer takes much less time - just put the "E" package on the other "I" and weld what would not fall apart. And that by the way such a way heats up more? In this case, it is secondary - the lower cost overcomes common sense.
    Renegat_pol wrote:
    Reality of the 1980s
    Box. Again, the cost of production is at stake. To this day I have two automatic transformers (flipper) wound without using a wireframe (Made in the early 70's in the USA). Not only that - not even flooded with any resin or other binder. Simply put the coils separately on the machine - and the wire will be tensioned as appropriate (and secured after winding so that it does not unwind like a released spring) faster and cheaper. And no winding protection (sealant or other shellac)? Nobody cared about it - it was faster and cheaper without.
  • #32
    ArturAVS
    Moderator - At Wesoła HydePark
    398216 Usunięty wrote:
    If such welded cores were ONLY in microwaves, then you would be 100% right. Unfortunately; many audio amplifiers also have a welded core. It is only about the fact that the production of such a transformer takes much less time - just put the "E" package on the other "I" and weld what would not fall apart. And that, by the way, this is more likely to happen
    heats? In this case, it is secondary - the lower cost overcomes common sense.

    That's right, however MOTs are definitely not for continuous operation and have a very high no-load current. In amplifiers this current is definitely smaller.
  • #33
    398216 Usunięty
    Level 43  
    arturavs wrote:
    That's right, however .........

    That is why I wrote about luck in audio to show that the assumption that the welded cores were used only in microwaves due to the fact that he works in an intermittent work regime and that he would not buzz is not 100% true.

    PS Transformers with flippers have 600VA each.
  • #34
    ArturAVS
    Moderator - At Wesoła HydePark
    398216 Usunięty wrote:
    Transformers made of flippers are 600VA each.

    Somewhere I am overturned somewhere safety 220/380 / 24V 6.3kVA from the 70s (due to the construction sometimes used as a welder :-) ), where there is no carcass.
    Windings wound with a solid copper flat bar (both), and tied with tape (I suspect cotton). In order to stiffen the windings, resotex wedges are hammered on the core.
    The whole strongly impregnated with electro-insulating varnish.
  • #35
    398216 Usunięty
    Level 43  
    arturavs wrote:
    Windings wound with a solid copper flat bar (both), and tied with tape (I suspect cotton). In order to stiffen the windings, resotex wedges are hammered on the core.
    The whole strongly impregnated with electro-insulating varnish.
    At least a copper flat bar with a large cross-section, tying the windings with tape and wedges ... These are not even mine. 2.5mm diameter wire on only one winding (there are several different voltages and currents) and inserted under the box, which is on the top of the windings, a plate made of thicker box with connectors for soldering the windings and output wires. As you look from above, you can see the individual layers of windings and insulation. NOT COVERED ANYTHING.