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Thread: Mechanical Switching

  1. #61
    Solavei
    IMG_20170405_165334867.jpgIMG_20170405_170657444.jpg

    Ran the motor today off just the attraction pulse.
    Roughly lined the commutator up by eye then didnt touch it again.

    14V, 2.8A with no resistance pulling 1500rpms and climbing.
    24V, 5A varistor by passed 3600rpms and climbing.

    Ran it for 10 mins or so with no worries.
    Not much vibration at all and one happy tinkerer.
    Pitting in the commutator all across the leading edge was interesting at such low power.
    Coils did not warm at all.
    Last edited by Deuis; 04-05-2017 at 09:17 PM.

  2. #62
    Senior Member Faraday88's Avatar
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    Quote Originally Posted by Deuis View Post
    IMG_20170405_165334867.jpgIMG_20170405_170657444.jpg

    Ran the motor today off just the attraction pulse.
    Roughly lined the commutator up by eye then didnt touch it again.

    14V, 2.8A with no resistance pulling 1500rpms and climbing.
    24V, 5A varistor by passed 3600rpms and climbing.

    Ran it for 10 mins or so with no worries.
    Not much vibration at all and one happy tinkerer.
    Pitting in the commutator all across the leading edge was interesting at such low power.
    Coils did not warm at all.
    Hi Deius,
    Just wanted to know.. what are those Banks of High-Voltage Capacitors for????
    Rgds,
    Faraday88.
    '' A Theory cannot precede a series of Experiments..unless one experiment
    debunks many theories''

  3. #63
    Just to smooth out the DC.
    I have the DC supply for 10-60V.
    I have A variac and various other transformers for the higher voltages.

    Mains power till I sort the system out then I will move over to batteries.
    IMG_20170406_145328377.jpg

    Dont look too much into the photos, there are no secrets im just scrapping stuff together to make things fit for the moment.

    Quote Originally Posted by Faraday88 View Post
    Hi Deius,
    Just wanted to know.. what are those Banks of High-Voltage Capacitors for????
    Rgds,
    Faraday88.

  4. #64
    Senior Member Faraday88's Avatar
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    Quote Originally Posted by Deuis View Post
    Just to smooth out the DC.
    I have the DC supply for 10-60V.
    I have A variac and various other transformers for the higher voltages.

    Mains power till I sort the system out then I will move over to batteries.
    IMG_20170406_145328377.jpg

    Dont look too much into the photos, there are no secrets im just scrapping stuff together to make things fit for the moment.
    Nice work Deius!!!you have put lot of efforts into all this..your endevour shall lead you to great success.
    Rgds,
    Fadaray88.
    '' A Theory cannot precede a series of Experiments..unless one experiment
    debunks many theories''

  5. #65
    https://youtu.be/2mv_Ybep--k

    JB jokes in the book about vacuum advance on his mechanical commutators....
    Well there may be some truth to that.
    I advanced the timing ahead and green sparks started shooting from the commutator.
    The machine also went up 1000rpm's.
    The sparking seemed to be more evident when the coils where magnetically coupled together. (I placed an allen key across the back of the cores..).
    This seems to defeat my theory i splitting the corner spins to see what happens for now.
    Last edited by Deuis; 04-08-2017 at 09:53 PM.
    Fark it just get it done.

  6. #66
    https://youtu.be/BT-ym3JqItU

    Balancing has come along nicely.
    Fark it just get it done.

  7. #67
    Quote Originally Posted by Deuis View Post
    https://youtu.be/2mv_Ybep--k

    JB jokes in the book about vacuum advance on his mechanical commutators....
    Well there may be some truth to that.
    I advanced the timing ahead and green sparks started shooting from the commutator.
    The machine also went up 1000rpm's.
    The sparking seemed to be more evident when the coils where magnetically coupled together. (I placed an allen key across the back of the cores..).
    This seems to defeat my theory i splitting the corner spins to see what happens for now.
    Machine is looking good. Just wanted to mention that that green could just be from copper flaking of and burning though. Copper naturally burns green. You can look that up on google but I also know it to be true first hand from making the copper/magnesium cells.

  8. #68
    Hi bob,

    Yes it was copper burning.
    A segment shorted out.
    I machined the commutators to suit the shaft and some swarf got stuck in between.
    I didnt pick it up untill I found the wrong segment had wear marks where it should not have had any.
    Thats about enough playing around with one brush.

    Machines top speed is about 5000rpms for the moment on mains power.
    Im getting problems that wouldnt be evident running on pure DC.
    The advance is about 20 degrees for max rpms.

    Interesting to note that when power is disconnected sparks still jump across that commutator indicating plenty of power bouncing around.

    Quote Originally Posted by BobZilla View Post
    Machine is looking good. Just wanted to mention that that green could just be from copper flaking of and burning though. Copper naturally burns green. You can look that up on google but I also know it to be true first hand from making the copper/magnesium cells.

  9. #69
    Senior Member John_Koorn's Avatar
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    Very good John!

  10. #70
    Senior Member Faraday88's Avatar
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    Solavei
    Quote Originally Posted by Deuis View Post
    https://youtu.be/2mv_Ybep--k

    JB jokes in the book about vacuum advance on his mechanical commutators....
    Well there may be some truth to that.
    I advanced the timing ahead and green sparks started shooting from the commutator.
    The machine also went up 1000rpm's.
    The sparking seemed to be more evident when the coils where magnetically coupled together. (I placed an allen key across the back of the cores..).
    This seems to defeat my theory i splitting the corner spins to see what happens for now.
    Hi Deuis,

    It would be very interesting to watch how the Sparks jump between the segments under a High-Speed video shooting..would impress to estimate the Energy over shoot!!
    Rgds,
    Faraday88.
    '' A Theory cannot precede a series of Experiments..unless one experiment
    debunks many theories''

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