[NM020ABS], Technical Note, Thomas Alva Edison, November 29th, 1886


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[NM020ABS], Technical Note, Thomas Alva Edison, November 29th, 1886

Editor's Notes

drawing "Object of patent regulation of the EMF at the reducing station while that at Central Station is constant-- AA' are tow Motors wound so that a 1/2 speed they give a minium counter electro motor force B are motors which are run from the low tension line-- When the volts are to be increased or diminished on the high line the fields of B are increased or diminished in strength & thus the motor B runs at a higher or lower speed-- Thus causing A to give greater or lesser counter EMF or back pressure Thus if the Central station has a constant of 2500 volts & A a counter pressure of 500 volts, The net will be 2000; if now there is a fall of pressure due to load The strength of the field of B is increased, the speed of A diminished & the back pressure diminishes thus bringing the pressure up to the required amount."




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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
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