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Thread: Joes ZFM Adventures

  1. #1

    Joes ZFM Adventures

    Hi All,

    I figured I’d start a thread for documenting my work with the ZFM so others can see what I’m doing etc.

    Here is a link to two videos. I built my first Bedini/Cole and it ran great for a few mins then the left two devices got hot and the rpms went for a dive. I think the resistors I got where too low in wattage. I remember Yaro mentioning that in his 2017 presentation but could be the devices them selves.

    Also, wondering if the Bedini/Cole is intended to run with the recovery circuit (bridge rectifier) connected to the run bat or cap dump? Just thinking that I was running it with no recovery circuit at all so maybe thats what blew the transistor(s)?

    Also, as a heads up, later this year I will have a completed Bedini/Cole PCB with swappable T)-246 slots, labelled component areas etc along with a Digikey BOM. That way anyone can just order the BOM and PCB and just solder it up and be ready to rock.

    https://drive.google.com/open?id=11X...59BXkzpdwmsGX_

    If anyone has any input as to what may be failing or any circuit build tips please feel free to let me know!

    More adventures to come!

    Cheers!

    Joe
    Last edited by Joster; 10-28-2019 at 11:03 AM.

  2. #2
    Senior Member Yaro1776's Avatar
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    I like your attitude!!!
    Yaro

    "The Universe is under no obligation to make sense to you." -Neil Degrasse Tyson

  3. #3
    Senior Member Yaro1776's Avatar
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    Joe,

    The recovery circuit is just an add on and not necessary for operation of the ZFM circuit. The overheating of the transistors can be caused by several things, one primary reason is that the reed switch timing is a bit off and one switch/leg is powered up too long. Check each reed switch leg individually to ensure proper firing duration and on/off function, otherwise the board may be fighting itself.

    First BP board had very hot resistors - James McD upped the resistor wattages and solved that problem. The transistors on the current BP board have heat sinks on them and they will warm up under high voltage and load. I use an oscope to measure both voltage and amperage real time since an ordinary clamp on amp meter averages out the reading and does not show the peak reads. Oscope is also very useful for getting the timing up to snuff.

    I have not viewed your videos as yet - some issues on my end with .mp4 format and Google - I will get to it over the weekend.
    Yaro

    "The Universe is under no obligation to make sense to you." -Neil Degrasse Tyson

  4. #4
    Thanks so much Yaro! This is extremely valuable info for me. Yes my resistor eattages are way too low lol. I will have a dedicated youtube channel up soon to make the videos easier to view. Here is this one for now

    https://youtu.be/yIvxoTFyxNo

  5. #5
    Senior Member Yaro1776's Avatar
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    Checked out the YT link this morning, your ZFM Motor runs very smoothly and is very quiet. Great build!!!

    Love the pillow block design and construction using the 3D printer.
    Yaro

    "The Universe is under no obligation to make sense to you." -Neil Degrasse Tyson

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