Bedini RPX Sideband Generator

* NEW * BEDINI RPX BOOK & DVD SET: BEDINI RPX


ONLY 150 118 90 2 SEATS AVAILABLE! - 2018 ENERGY CONFERENCE

Monero XMR

Page 4 of 4 FirstFirst ... 234
Results 31 to 35 of 35

Thread: ZFM Advanced Explorations

  1. #31
    Senior Member Yaro1776's Avatar
    Join Date
    Aug 2012
    Location
    Heart of Vermont
    Posts
    294

    ZFM Biflar Coils and the Parallel Quandary II

    Appreciate the positive comment John,

    Anyway, decided to flesh this coil question out by running an additional experiment with both coils now in parallel - no Bifilar for the 4 strands. The individual coil resistance is 3 ohms with the parallel configuration yielding 1.7 ohms. This experiment was run at 24v with the same load values as the previous experiment for a valid comparison.

    Surprisingly there was no real difference in the values of the results. It was as if the prior experiment was run again. Check out the data and schematic below.

    ZFM Parallel Coil Config.pdf
    ZFM Parallel Coil Torque.pdf

    Both parallel configurations do produce very different operational characteristics versus the series coil configuration. There may be individual differences in the two parallel configurations that may be noted with some further load testing. For the time being this will be put aside for future reference. As a note the parallel mode is a bit sensitive to voltage, however the usable voltage range is between 20v and 36v for this particular rotor/Neo arrangement. Higher voltages do not appear to be that useful at this time.
    Yaro

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

  2. #32
    Senior Member Yaro1776's Avatar
    Join Date
    Aug 2012
    Location
    Heart of Vermont
    Posts
    294

    Two Pole ZFM

    Hello to All,

    The prior post Parallel experiments, with the 2.0Lx0.5Tx0.5W Neo, were interrupted by a skin failure of the Neo magnet at around 12,000 RPM. Just finishing the test program, when the one Neo separated from the iron core. Shipping tape wrap prevented any serious damage, but the rotor is toast. Unfortunately, I did not complete the series torque test for a truly valid comparison. However, data from and performance of similar rotor's in series is very close at the lower voltages and efficiencies. At least it is useful.

    Moving on, the next experiment is with a two pole rotor ZFM (North Face Out).

    Purpose of this exercise is to evaluate a two pole (North out) rotor configuration under various firing configurations and to establish performance baselines for the various modes of operation. Series, Bifilar and Parallel. This rotor configuration squeezes the Neo/coil gap to under 0.050" at the Neo edges and coil ends - very tight! Will this tighter gap improve performance?

    Since the rotor is two pole, it is intuitive to fire the coils every 180 degrees. However the initial experiment in series mode will fire the coils' every 90 degrees as a start, since both opposing coils span span 90 degrees each - what happens when the coils are fired in the remaining dead zone between the coils?

    Fortunately, the next round of experiments will be bolstered by the new o-scope for further clarification. May take a bit to get adjusted to the new electronics. See what happens...

    Yaro
    Yaro

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

  3. #33
    Senior Member John_Koorn's Avatar
    Join Date
    Jul 2012
    Location
    Melbourne, Australia
    Posts
    1,063
    Hi Yaro, it's unfortunate that the rotor is toast. I sincerely hope no one was injured! Rotors can be rebuilt - eyes on the other hand, cannot.

    John K.

  4. #34
    Senior Member Yaro1776's Avatar
    Join Date
    Aug 2012
    Location
    Heart of Vermont
    Posts
    294
    Thanks for the interest John,

    Quote Originally Posted by John_Koorn View Post
    Hi Yaro, it's unfortunate that the rotor is toast. I sincerely hope no one was injured! Rotors can be rebuilt - eyes on the other hand, cannot.

    John K.
    I definitely was pushing the envelope with that particular test at maximum advance and 36v in parallel coil mode. Bear in mind that in parallel mode the current/voltage affect to the coils is similar to 72v in series mode. Normally in series mode the max voltage threshold is 48v for obvious safety reasons. One can only speculate as to the forces generated at that high a voltage hammering the rotor Neo's 800 times per second at 12,000 RPM.

    A walk on the wild side,
    Yaro
    Last edited by Yaro1776; 09-15-2018 at 04:41 AM. Reason: clarification
    Yaro

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

  5. #35
    Senior Member Yaro1776's Avatar
    Join Date
    Aug 2012
    Location
    Heart of Vermont
    Posts
    294

    Two Pole Rotor ZFM Experiments

    November Greetings to All,

    Back in the experiment mode after a busy Summer and Fall hiatus. Definitely a good opportunity to clear the head and start afresh with the next ZFM episode.

    The new Oscope has been a great addition to the test instrumentation and has yielded satisfactory results to date, in particular when examining the firing characteristics of the ZFM in the following experiments.

    The initial thrust of the 2 pole experiment was to investigate the behavior and operational characteristics of the standard two 90 degree opposing coil ZFM in two modes of operation. Normally a coil is energized when the Rotor's Neo magnets are within the coil, however in this instance the coils are energized both within the coils and external to them. The coils are energized 4 times a revolution. A second variant of 2 energizings per revolution was also run. Please note that this configuration has a very tight gap of ~0.040" between the rotor edge and coil.

    The first pic demonstrates the 4x mode at 45.98v at 0..92A ad 8491 RPM. The higher voltage was used to demonstrate the voltage (yellow line) and amperage (blue line) values in more detail.
    pic_15_3.jpg

    Pic 2 demonstrates the generated voltage created by the ZFM when the power is off to the coils and freewheeling.
    pic_15_4.jpg

    Pic 3 demonstrates one leg of the firing circuit only; at 48.48v at 0.72A and 5899 RPM. The rotor is within the coil when energized. Coils are energized 2x per revolution.
    pic_15_7.jpg

    Pic 4 demonstrates the other leg of the firing circuit only; at 47.94v at 0.74A and 6386 RPM. The rotor is in the 90 degree empty space between the coils. Coils are energized 2x per revolution.
    pic_15_8.jpg

    So the above demonstrates that the coil end points are the true drivers of the ZFM in the present configuration. It is interesting to note that the RPM is higher during the empty space firing. This was observed several times under several different voltages, firing angles and advances.

    Feel free to comment...
    Yaro

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

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •