World's Advance Volume 29

World's Advance Volume 29

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...cut out. With standard makes of such rheostats, this condition is secured when the knob is turned as far as it will go in a counter-clockwise direction. Close the main double-pole switch and then turn the lever of the starting rheostat. S. R., to the right. Ii conditions are proper, the motor will at once attain its normal speed. Now close the other double-pole switch, whereby the field of the alternator will become energized. Alternating electromotive forces will then be generated in its stator winding and their value can be read by turning the left hand voltmeter switch to its lower position. The strength of the field should be adjusted by turning the alternator field rheostat until about 100 volts is indicated. If a counter is at hand, the speed might well be measured and by adjustment of the direct current rheostat should be set at about 1,800 revolutions. Again adjust the other rheostat until voltage is corrected to about 100. These two settings of the rheostats may now be marked and will serve as guides in subsequent startings. Then turn the keys of the lamp sockets, when at once the lamps will alternately brighten and dim, for at times there will be opposition of received and generated voltages whereby the lamps will go out, then conjunction from the two sources and double voltage will be acting on them. Adjust the direct current rheostat until the "beats" are as slow as possible. If all three lamps show simultaneous beats, Fig. 87.--Diagram of Connections for Motor-generator Battery Charging Set, showing Arrangements for Synchronizing when starting from Direct Current Source. right direction, successive beats that the machine has been started in one direction while the external source of power demands the other. To close...
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Product details

  • Paperback
  • 189 x 246 x 16mm | 531g
  • United States
  • English
  • black & white illustrations
  • 1236760786
  • 9781236760784