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Valves / Vacuum Tubes
EI VS C-Core for PP transformer question
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<blockquote data-quote="Ampdog" data-source="post: 601551" data-attributes="member: 144"><p>John,</p><p></p><p>Indeed - if I may continue on this line ....</p><p></p><p>One needs to realise that windings (layers) are never flat; there is always something of an 'arc'. It is impossible to calculate for this, other than allow a certain space factor more by experience than any way else. (I am talking of fully layer-wound windings. These days it is increasingly found that random winding - time saving - is more the rule. There it is even more difficult. It cannot be avoided that wires cross multiple times, giving an increase in total winding height.) This will naturally also affect leakage reactance in OPTs, as the distance between layers is a factor in the formula.</p><p></p><p>Regarding that I am frowned at for using very small space factors as in some 9 -7% and then compressing windings in a vice during assembly. "You will damage the insulation!!" Not really, as the space is there as in air between layers - measure at the 'corners' where there is no air. The added advantage is a slight increase in inductance, when the outside windings are also close to the core.</p><p></p><p>So all-in-all (to be OT) a successful OPT is also very much of a precision task involving time and patience - factors not in the interest of economy or mass-production. </p></blockquote><p></p>
[QUOTE="Ampdog, post: 601551, member: 144"] John, Indeed - if I may continue on this line .... One needs to realise that windings (layers) are never flat; there is always something of an 'arc'. It is impossible to calculate for this, other than allow a certain space factor more by experience than any way else. (I am talking of fully layer-wound windings. These days it is increasingly found that random winding - time saving - is more the rule. There it is even more difficult. It cannot be avoided that wires cross multiple times, giving an increase in total winding height.) This will naturally also affect leakage reactance in OPTs, as the distance between layers is a factor in the formula. Regarding that I am frowned at for using very small space factors as in some 9 -7% and then compressing windings in a vice during assembly. "You will damage the insulation!!" Not really, as the space is there as in air between layers - measure at the 'corners' where there is no air. The added advantage is a slight increase in inductance, when the outside windings are also close to the core. So all-in-all (to be OT) a successful OPT is also very much of a precision task involving time and patience - factors not in the interest of economy or mass-production. [/QUOTE]
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Valves / Vacuum Tubes
EI VS C-Core for PP transformer question
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