610 turns of 40AWG / 45 SWG wiring in 4 "layers" anyone experience of such winding and thoughts on resulatant (lack of) structural integrity, slip/sliding turns with temp cycling/magnostriction etc leading to failure. I've never seen a transformer design brief, so perhaps interesting to others on that aspect alone Tektronix 7834 scop HV transformer,(flyback misnomer)
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some general info including bank winding, I've only ever seen on high DC chokes so structurally sound
Not sure what you are getting at. According to the winding winding diagram and notes, the 610 turn winding is machine wound in a 'bank' winder so it should be tight and even. I would expect that the #40AWG wire is 'served' with polyester yarn which gives it a high surface friction so the turns tend to lock together. Finially, I imagine the finished coil assembly is vacuum 'varnished' to seal out moisture and fill all air gaps as well as lock the whole assembly into a solid mass. I am surprised to see bank winding is back in fashion; we used to bank wind torroids 50 years ago to give minimal parallel capacitance to the inductance, but that seemed to fade out when ferrite pot cores replaced powdered iron torroid cores through the '60s. For very low capacitance coils we would then use 'Pi' or 'universal' wound coils, but they too must be flooded with a sealing compound to lock their rather frail structure that relies wholly on wire tension for stability in the 'as wound' state.
Not sure what you are getting at. According to the winding winding diagram and notes, the 610 turn winding is machine wound in a 'bank' winder so it should be tight and even. I would expect that the #40AWG wire is 'served' with polyester yarn which gives it a high surface friction so the turns tend to lock together. Finially, I imagine the finished coil assembly is vacuum 'varnished' to seal out moisture and fill all air gaps as well as lock the whole assembly into a solid mass. I am surprised to see bank winding is back in fashion; we used to bank wind torroids 50 years ago to give minimal parallel capacitance to the inductance, but that seemed to fade out when ferrite pot cores replaced powdered iron torroid cores through the '60s. For very low capacitance coils we would then use 'Pi' or 'universal' wound coils, but they too must be flooded with a sealing compound to lock their rather frail structure that relies wholly on wire tension for stability in the 'as wound' state.
Neil S.
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I was trying to visualise the mechanics of the winding machine, backlash error for the reversing cam , once per bank,150 times for this coil. Runout error trying to keep the overall traverse in step with the banking over the width of run. And all the time just surface tension , assumed wound wet, to stop the turns avalanching down the bank slopes.
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