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A question on generators.

Discussion in 'General Electronics' started by dhanu, Oct 5, 2003.

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  1. dhanu

    dhanu Guest

    Hello there,

    I have this simple question on generator theory which is
    bogging me down.

    I know that the resistance of the field windings of a shunt
    generators should be less than a certain critical resistance otherwise
    the emf produced by the residual magnetism will not be sufficient to
    develop any voltage in the generator.

    Is there any minimum limit to the resistance also? Is there
    any such limiting value of field resistance below which the resistance
    should not decrease? If so, then what will happen if the resistance of
    the field decreases below this minimum value.
    Thank you in advance for responding.
  2. Robert Baer

    Robert Baer Guest

    N turns of wire sweeping thru a given magnetic field at a given
    velocity and angle will generate an EMF that can be calculated and has
    absolutely *nothing* to do with the resistance of the wire.
    Now if you want to draw current from that wire/winding, then the
    current could be limited by the resistance of the winding (wire) along
    with the resistance of the load.

    As far as minimum resistance, if one uses silver wire, and maybe make
    it rectangular in cross section so as to maximize packing factor (use of
    space), then one could approach a minimum without use of superconductors
    and cryogenics.
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