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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

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