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Thread: Mechanical Switching

  1. #81
    Solavei
    Switching is laid out as so.
    Blue triangle is the harvesting of the inductive collapse.
    Orange Triangle is the pulse to the coil.
    One full segment is allowed so the two are physically segregated.
    All orange triangles are commoned to the supply slip ring.
    All Blue triangles are commoned to the second collection ring to the capacitor.
    Timing points are the rotation of the commutators and the position of the switching brush.

    Attachment 6316

  2. #82
    Dear diary,

    Thnkyou santa for supplying the transformer steel, it will do nicely in my new wider bobbin.
    the loaners from the 10 coiler need to go back home.
    Core will be 150mm wide to match the width of the magnets.
    Havent decided on the gauge of the filar coils yet.
    Ive got 10, 13 and 26 Gauge in stock.
    13 too big?
    Bobbin1.JPGBobbin2.JPGBobbin.JPGCard.JPG
    Last edited by Deuis; 06-08-2017 at 02:54 AM.
    Fark it just get it done.

  3. #83
    Senior Member John_Koorn's Avatar
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    Watching intently

  4. #84
    I suppose you better watch this then and explain it to me.
    The core is 150mm wide X 25mm thick by 110mm deep.
    I have wrapped 4 strands of 1.8mm maget wire around for a total of 1.2ohms in series. (45m a strand)
    I ran out of wire so thats all it got.
    The machine is running off 29VDC power supply with a series of capacitors doing 540rpm with 1A of current.
    It ramps up to this speed in about 5 seconds. (2kg shaft)
    It is shooting 15mm green sparks consistantly while the brush is no more than 40 degrees and I can touch the commutator during operation indicating that it is not vaporising the copper. I used some compressed air on the commutator to see if it would cool down / blow out the sparking.
    The arcs wrapped around the end of the commutator to be about 20mm long.
    I am not harvesting any energy off this it is just a motor at the moment.
    The timing is way different to the previous coils.

    https://www.dropbox.com/s/awzoqqai0g...08040.mp4?dl=0
    https://www.dropbox.com/s/dcr5bp685d...10795.mp4?dl=0

    Quote Originally Posted by John_Koorn View Post
    Watching intently
    Watch the timing of sparks through the commutator, it has a rhythm.
    https://www.dropbox.com/s/0o8vnhe07f...16805.mp4?dl=0
    Last edited by Deuis; 06-09-2017 at 10:13 PM. Reason: 3rd video

  5. #85
    Senior Member John_Koorn's Avatar
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    Quote Originally Posted by Deuis View Post
    I suppose you better watch this then and explain it to me.
    The core is 150mm wide X 25mm thick by 110mm deep.
    I have wrapped 4 strands of 1.8mm maget wire around for a total of 1.2ohms in series. (45m a strand)
    I ran out of wire so thats all it got.
    The machine is running off 29VDC power supply with a series of capacitors doing 540rpm with 1A of current.
    It ramps up to this speed in about 5 seconds. (2kg shaft)
    It is shooting 15mm green sparks consistantly while the brush is no more than 40 degrees and I can touch the commutator during operation indicating that it is not vaporising the copper. I used some compressed air on the commutator to see if it would cool down / blow out the sparking.
    The arcs wrapped around the end of the commutator to be about 20mm long.
    I am not harvesting any energy off this it is just a motor at the moment.
    The timing is way different to the previous coils.

    https://www.dropbox.com/s/awzoqqai0g...08040.mp4?dl=0
    https://www.dropbox.com/s/dcr5bp685d...10795.mp4?dl=0



    Watch the timing of sparks through the commutator, it has a rhythm.
    https://www.dropbox.com/s/0o8vnhe07f...16805.mp4?dl=0
    Wow, that's cool

  6. #86
    Timing-
    The book says that a simple mechanical timer is a split commutator slightly less the 180 indicating that the attract and dump are a 50% cycle rate between them.
    On this motor I have been running a 1:3 cycle rate.
    When the attraction is set on the 3 cycle the standard sparking occurs with average motor torque.
    When the attraction mode is set on the 1 cycle the green pulsing occurs.
    This tells me that the faster the on time the better.

    I do have room on the commutator to go a 2:2 or 1:1 cycle rate.

    The nagging thought in my head is that the motor is a balance equation and the differance is the charge and discharge cycles.
    Specifically the 1st time constant of the two.
    The capacitor will charge to 63% in the first time constant. If the sharp rate is the most desired then the capacitor should be matched to charge and discharge in the single constant.
    The inductor is the same for the first time constant therefore to achieve maximum inductance in the shortest time for matched pairs it should be charge for one constant dump for one constant.
    This is perhaps where the filar winds come in. By having parallel inductors the time constant is minimised allowing for maximum charge.

    So really ive answered myself as its a ratio to charge and dump which is set by the coil winds/makeup, voltage and pulse time.
    Therfore if chasing the highest non equilibrium focusing on the shortest time constants is a must.

    Or i could be babbling garbage.

  7. #87
    Quote Originally Posted by Deuis View Post
    Timing-
    The book says that a simple mechanical timer is a split commutator slightly less the 180 indicating that the attract and dump are a 50% cycle rate between them.
    On this motor I have been running a 1:3 cycle rate.
    When the attraction is set on the 3 cycle the standard sparking occurs with average motor torque.
    When the attraction mode is set on the 1 cycle the green pulsing occurs.
    This tells me that the faster the on time the better.

    I do have room on the commutator to go a 2:2 or 1:1 cycle rate.

    The nagging thought in my head is that the motor is a balance equation and the differance is the charge and discharge cycles.
    Specifically the 1st time constant of the two.
    The capacitor will charge to 63% in the first time constant. If the sharp rate is the most desired then the capacitor should be matched to charge and discharge in the single constant.
    The inductor is the same for the first time constant therefore to achieve maximum inductance in the shortest time for matched pairs it should be charge for one constant dump for one constant.
    This is perhaps where the filar winds come in. By having parallel inductors the time constant is minimised allowing for maximum charge.

    So really ive answered myself as its a ratio to charge and dump which is set by the coil winds/makeup, voltage and pulse time.
    Therfore if chasing the highest non equilibrium focusing on the shortest time constants is a must.

    Or i could be babbling garbage.
    This is good stuff - now you're in it! good times, eh...
    "...the faster the on time the better." and other than torque vs efficiency, duration makes little difference.
    Reading with much interest, I hope you continue to share - Thanks!
    -Patrick

  8. #88
    Find attached charge curve.
    The charge curve obviously flattens off once the capacitor is charged but thats not the end of the curve we are interested in.
    The faster the discharge of the inductor the higher the voltage.
    The Di-pole flash will simultaneously discharge the inductor (with lag) while dumping a disproportionate amount of charge into said suitably large capacitor bank.
    This is the creation of the non-equilibrium no?

    The higher the voltage, the larger the coil the wilder it gets.


    RC Charge curves.JPG
    Fark it just get it done.

  9. #89
    I was looking at suitable rotors last night and came across this.
    http://www.ebay.com.au/itm/LCD-26-4-...UAAOSwEHpZN7Dw
    Would be a great test bed to test generator coils.
    Mount the magnets on the wheel and you can dial in the speed you want.
    Measure the motor current without a coil, then add the coil and calculate the differance.
    Discharge the battery or load and voila a very quick and accurate test bed for the effectivness of the coils.
    Go even further and bang as many gennie coils around it and crank it up see what it can do!

  10. #90
    Senior Member John_Koorn's Avatar
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    Solavei
    That's pretty cool. Good idea.

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