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Thread: ZFM Advanced Explorations

  1. #41
    Senior Member John_Koorn's Avatar
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    Still reading with interest Yaro

    John K.

  2. #42
    Senior Member Yaro1776's Avatar
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    Two Pole Rotor ZFM Experiments VI

    November ended with a body slam of 16+ inches of damp snow that knocked out power and comm for 72 hours - this effectively delayed the following post until now.

    The change to the Timing Rotor Neo configuration to NN was a great improvement in overall performance yielding the following data:

    Coil Serial Mode: 35.86v 8294 RPM at 1.10A

    pic_31_1.jpg

    Coil Parallel Mode: 24.5v 8571 RPM at 2.90A

    pic_31_10.jpg

    Inspection of the above O-scope pics demonstrates the changes in the coil firing, for both modes, to a more regular pattern. Later, the Reed switches were further tweaked manually for a better equality of the dead time between firings.

    This should finish out this round of 2 Pole ZFM configuration experiments and the results were certainly worth the effort as follows:
    1) It was demonstrated that the opposing 90 degree empty segments of arc without a coil do not appear to negatively impact performance. The unusual characteristic of the empty arc segment yielding a greater RPM than the Coil segment when one leg of the firing circuit is disabled. This aspect was repeatable on multiple occasions.

    2) The modification to the Neo configuration, from a N-S opposing pattern to a N-N opposing pattern, demonstrated that the magnetic field interplay between the ZFM Motor and Timing Rotor are very important for maximum performance. It appears that the Motor Rotor Neo's play an important part in the 2 Pole arrangement and do influence the Reed switches and timing.

    3) The 2 Pole ZFM will produce enough torque to drive a modest load, albeit not very efficiently.

    Next on the agenda is to modify the existing Motor Rotor to a 4 Pole configuration - the upcoming Holidays will undoubtedly delay this a bit.

    Happy Holidays...
    Yaro

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

  3. #43
    Senior Member Yaro1776's Avatar
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    4 Pole ZFM with Big AL2 rotor

    Hello to all,

    Now that the 2018 holidays gave everything that you desired, it is time to move on to the continuing ZFM saga. This closing chapter will use the previous 2 Pole rotor and add two more opposing Neo's (1"wx1"l x 1/2"t) creating the standard 4 Pole rotor configuration. However, this rotor is larger dimensionally and with the above Neo's the edges clear the coil by about 1/16". Very tight! A difference of nearly 1/8".

    In essence, this is about as tight a Neo to Coil gap as is practical. Ideally a curved arc segment Neo would be the best and offer a tighter gap, but all that is readily available are the rectangular Neo's. It is useful to bear in mind that the greatest magnetic field on a rectangular Neo is the center of the pole face. The performance of this configuration will be compared to prior test data to observe if any gains are realized through the gap reduction.

    Since this is, perhaps, the final effort with the 4 Pole configuration, particular attention was paid to minimizing the bearing friction and perfecting the alignment. The initial proofing runs yielded 8800 RPM at 1.55A and 24.65V (LAB power) in Coil parallel mode. The transistors remained at skin temperature.

    Another adder to this configuration will be a BEMF recovery circuit as described by R Cole's circuit schematic. It will be interesting to experiment with the tighter gap and the BEMF circuit. See below.
    Bedini Cole Bipolar Switch.jpg

    Enough for now and Happy New Year,
    Yaro

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

  4. #44
    Hi Yaro,

    Quote Originally Posted by Yaro1776 View Post
    Hello to all,

    Now that the 2018 holidays gave everything that you desired, it is time to move on to the continuing ZFM saga. This closing chapter will use the previous 2 Pole rotor and add two more opposing Neo's (1"wx1"l x 1/2"t) creating the standard 4 Pole rotor configuration. However, this rotor is larger dimensionally and with the above Neo's the edges clear the coil by about 1/16". Very tight! A difference of nearly 1/8".

    In essence, this is about as tight a Neo to Coil gap as is practical. Ideally a curved arc segment Neo would be the best and offer a tighter gap, but all that is readily available are the rectangular Neo's. It is useful to bear in mind that the greatest magnetic field on a rectangular Neo is the center of the pole face. The performance of this configuration will be compared to prior test data to observe if any gains are realized through the gap reduction.

    Since this is, perhaps, the final effort with the 4 Pole configuration, particular attention was paid to minimizing the bearing friction and perfecting the alignment. The initial proofing runs yielded 8800 RPM at 1.55A and 24.65V (LAB power) in Coil parallel mode. The transistors remained at skin temperature.

    Another adder to this configuration will be a BEMF recovery circuit as described by R Cole's circuit schematic. It will be interesting to experiment with the tighter gap and the BEMF circuit. See below.
    Bedini Cole Bipolar Switch.jpg

    Enough for now and Happy New Year,
    This sounds very interesting. I'm anxious to see the results.

    By the way, I found some curved magnets you might be able to use on the magnet4less web site. Here's the link. http://www.magnet4less.com/product_i...oducts_id=1199
    Gary Hammond,

  5. #45
    Senior Member Yaro1776's Avatar
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    4 Pole ZFM with Big AL2 rotorII

    Hello to Everyone in Legoland,

    For this set of experiments the 4 Pole Rotor in the ZFM is outfitted with four 1"Lx1"Wx1/2"T N52 Neos arranged in a NSNS configuration identical to prior configurations with the exception of the coil to Neo edge gap/clearance. The clearance was reduced to the practical limit of less then 1/16" or 2 mm. The prior rotors had between 0.160" to 0.300" clearance.

    The intention was to see if the ZFM torque curve improved over prior rotor arrangements; in essence, the motor did display a stouter Torque curve in both Series and Parallel mode. The maximum RPM was diminished, however the torque curve was expanded over a wider usable range. The maximum torque value was similar to prior tests, but the overall efficiency of the motor was diminished from the last tests with the 2"Lx1/2"Wx1/2"T rotor.

    The Firing advance setting was restrained for best work performance and not speed. The advance was set a bit beyond than the lowest amperage range read point. This resulted in lower overall speed, but at lower amps. Particularly useful for the parallel mode of operation to minimize transistor overheating at high loadings.

    BigAL2 Rotor:
    Parallel Mode
    23.80v, 8340 RPM at 1.40A and 000 gr Load, 34.75w with 0% eff
    24.69v, 4730 RPM at 2.86A and 510 gr Load, 70.64w with 22% eff
    The efficiency results ranged up to 28%. Transistor heating limited maximum loading

    Series Mode
    40.19v, 7000 RPM at 0.70A and 000 gr Load, 28.10w with 0% eff
    40.90v, 4852 RPM at 1.41A and 530 gr Load, 58.10w with 29% eff
    The efficiency results ranged up to 29%. Transistor heating was not an issue.

    The above performance results are lower than the 2"Lx1/2"Wx1/2"T rotor even though the overall magnetic pull force is identical. The 1.5"Lx1"x1/2" (67.5 lbs pull strength) Neo rotor pulled a 42% eff at similar loads.

    All the above demonstrates that the magnetic pull force exerted by the Neo has a positive impact on performance. The reduction in clearance does improve the basic tractability of the motor. The length of the Neo also comes into play. The coil clearance is another important factor. Endless possibilities, but the path is clear.

    The basic ZFM configuration is just an introduction. It is not optimized, but it does engage the experimenter whose purpose is gaining knowledge and understanding of the arcane world of magnetic field interaction.

    The next step is to integrate the R. Cole BEMF recovery circuit into the ZFM equation. Will it improve performance? Stay tuned...
    Yaro

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

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