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Thread: Bedini-Cole 1971 to 1984 built from lab notes WINDOW MOTOR

  1. #21
    old email is not working, plz PM me......

  2. #22
    Quote Originally Posted by John_Koorn View Post
    bro d, what's the DCR on each of the windings? Looks like you don't have enough wire for each of the windings. You should run them in parallel.

    John K.
    Hi John K,
    Thanks for responding.
    Please forgive me, I don't know what DCR means.
    The winding's are 120T,#19awg.
    Resistance on one coil is 2.9ohm.
    I'm thinking that parallel would be the same as tripling the wire size and it would take about 4 times as much wire as a full strength single coil machine.
    I want hi torque and don't need hi rpm.
    Open to your suggestions, Sir.
    Thanks,
    bro d

  3. #23
    DCR = Direct current resistance

    2.9 ohm is your DCR on one strand, 3 in parallel is 0.96ohm DCR

    I would hook each strand to a individual Bedini / Cole circuit that has a common trigger, similar to what JB did to his big wheel JB / Cole circuit with 3 parallel transistor circuits.... it may need 2 sets of parallel trannys per strand
    Last edited by RS_; 04-23-2014 at 06:19 PM.

  4. #24
    Thanks RS,
    The picture is filling in.
    I thought that might be the way to go.
    I need to be sure about my wire size and number of turns.
    Good advice can save me a lot on new wire.
    bro d

  5. #25
    Senior Member John_Koorn's Avatar
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    bro d,

    #19 will work but I'm pretty sure you're going need at least 3.8 ohms of wire for each strand. That should give you 1.27 ohms total DCR with all 3 windings in parallel. This will give you more speed and torque as well as less current draw.

    Are you running the full B/C circuit with dual halls for the trigger? If so, you may need to play with the size of the hall magnets to get the right balance between torque and speed. Smaller magnets = more speed and less torque.

    hope this helps

    John K.

  6. #26
    Quote Originally Posted by John_Koorn View Post
    bro d,

    #19 will work but I'm pretty sure you're going need at least 3.8 ohms of wire for each strand. That should give you 1.27 ohms total DCR with all 3 windings in parallel. This will give you more speed and torque as well as less current draw.

    Are you running the full B/C circuit with dual halls for the trigger? If so, you may need to play with the size of the hall magnets to get the right balance between torque and speed. Smaller magnets = more speed and less torque.

    hope this helps

    John K.
    Yes John K that is a big help.
    I put on 3 strands of #22, with 300 turns and it's 5ohm per coil.
    Used wire that I have a lot of.
    Putting on the 2nd one now.

    bro d
    Last edited by brodonh; 04-24-2014 at 12:09 PM.

  7. #27
    Ran it all day on 3 coils.
    Getting acquainted with it.
    Working on etchable boards.
    I learned Target 3001!V16 discover.
    Nice free circuit program. Drew and etched a lot with it.
    Have to try one board for each coil and also parallel tranny's.
    Plently to do.
    Havn't finished all the details of the frame.
    Keepin' on.
    bro d

  8. #28
    Quote Originally Posted by brodonh View Post
    Yes John K that is a big help.
    I put on 3 strands of #22, with 300 turns and it's 5ohm per coil.
    Used wire that I have a lot of.
    Putting on the 2nd one now.

    bro d
    Hi Bro d,

    This is probably a little late, but wanted to let everyone know we have added a wire resistance calculator under the Reference menu on our site: www.teslagenx.com/reference/awg.html
    Select the wire gauge, length and number of strands and the parallel resistance of the wires will be calculated.

    Erik

  9. #29
    etchable WM CCT.pdfredo PARALLELED WM CCT.pdf
    Quote Originally Posted by ErikN View Post
    Hi Bro d,

    This is probably a little late, but wanted to let everyone know we have added a wire resistance calculator under the Reference menu on our site: www.teslagenx.com/reference/awg.html
    Select the wire gauge, length and number of strands and the parallel resistance of the wires will be calculated.

    Erik
    Thanks Eric,
    That will come in handy.
    Today I worked 2 cct boards for this motor.
    I etched the standard one and populated it.
    It passed the smoke test at 12 v.
    The other one has 2 trannys in each position and the one that is running is a scaled back version of the parallel trannys version.
    I'll attach pics of both ccts.
    I'll be happy to give all info about them if someone is interested.
    I set these up the way John B did in the video.
    The trannys are bent flat away from the board on to Heat sink AL strips.
    It's a challenge to make a WM cct board that is single sided.
    I decided to have one bridge/jump wire rather than a much longer route that had a lot of weaving between compnnents.
    I didn't add FWBR connections but can for someone if they want it.
    That bridge can be added to the coil connections.

  10. #30
    Hi All,
    There is a problem with the etched cct.
    The independence of the two cct halves is Questionable.
    Maybe someone can see it.
    I'll go over it and redo the redo til wer're fine.
    bro d

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