Zen Pencils by Gavin Aung Than for May 13, 2019

  1. 2benny hill
    Yakety Sax  over 4 years ago

    “It is paradoxical, yet true, to say, that the more we know, the more ignorant we become in the absolute sense, for it is only through enlightenment that we become conscious of our limitations. Precisely one of the most gratifying results of intellectual evolution is the continuous opening up of new and greater prospects.” Nikola Tesla

    “Every living being is an engine geared to the wheelwork of the universe. Though seemingly affected only by its immediate surrounding, the sphere of external influence extends to infinite distance.” Nikola Tesla

    “The scientists of today think deeply instead of clearly. One must be sane to think clearly, but one can think deeply and be quite insane.” Nikola Tesla

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  2. P1000380
    A# 466  over 4 years ago

    Poeschl’s judgment is apt as he was considering the constant magnetic field generated by steady DC flow. However, the operation of brushes and commutator cause a continuous series of interruptions of the DC and changing magnetic field. The effect of this in a DC motor (or AC power in universal motors) is rotation of the magnetic field generated between the armature and field, and rotation of the motor shaft. Evidently Poeschl failed to grasp this fact, i.e. generation of a changing magnetic field in the armature windings in a DC motor. Tesla saw that AC produces a essential changing magnetic field by its nature. The practical problem was to design a machine that could exploit this fact. The solution was to employ a shorted armature situated in a rotating magnetic field. Like the DC motor armature, which is wound with interconnected coils of wire, laid in slots between magnetic poles, connected to a commutator, the AC motor armature is made with a series of short circuited conducting material (usually aluminum) cast between similar slots. The rotating AC field could be generated by field designs similar to those used in DC motors. When the shorted armature (rotor in AC parlance) is surrounded by a wire wound field (stator) supplied with AC multi-phase power, the resulting rotating magnetic field induces a torque in the shorted rotor. Voila, a brushless, sparkless, essentially maintenance free electric motor! Single phase motors operate in the same way however these must be designed with features or auxiliary devices that allow them to start by generation of an synthetic leading second phase and starting torque.

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  3. Jless
    jless  over 4 years ago

    Here some fun facts about Nikola Tesla:


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  4. 21192648
    wildman-al  over 4 years ago

    “I don’t know why you people seem to think this is magic. It’s just this little chromium switch here.”

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    MCProfessor  over 4 years ago

    It is ironic that Tesla never had the fame that was given to Edison even though it was Tesla’s power transmission scheme using alternating currents that became the world standard over Edison’s using direct current.

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  6. Grandpa hef
    Jeff0811  over 4 years ago

    So to sum up much of the above, We don’t know what we don’t know.

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