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    • 11. 发明授权
      US3590363A Generation of constant frequency alternating current energy at variable speeds of a generator 失效
    • Generation of constant frequency alternating current energy at variable speeds of a generator
    • 发电机变速时恒电流代替能量的产生
    • US3590363A
    • 1971-06-29
    • US3590363D
    • 1968-10-28
    • PRODUCTS & PROCESSES INC
    • SANABRIA ULISES A
    • H02K27/04 , H02P9/42
    • H02K27/04 , H02P9/42 , Y10T307/691
    • This invention is directed to the generation of fixed frequency alternating current for power purposes from a dynamoelectric machine driven at substantially different speeds. This is accomplished through the use of a series-wound DC motor laminated in accordance with good transformer design. The field of the motor is excited with a current of the desired frequency and approximate voltage of the desired output and the armature is rotated externally in excess of its normal speed as a motor to generate a voltage across its brush terminals which terminals are set in the neutral position as is common in a reversing series motor. The output voltage increases with load increase across the brush terminals until a maximum voltage is soon attained, e.g. 110 volts at no load; 112 volts with 200 watts load; 116 volts with a load of 600 watts and 117 volts with loads from 800 watts to 2.5 kilowatts after which the voltage gradually drops to about 110 at 4 kilowatts. As in an autotransformer the input power, except the I2R loss, reappears in the output load along with the output of the power generated in the armature. Therefore the variable armature flux, rather than being wasted as in common alternators, generates available current in the field. Inasmuch as the output is always in phase with the input the dynamo may be considered an auto or synchropolar generator. The cascading of two or more of these generators provides a spectacular advantage in that the power developed in each stage is added to the power of the output system resulting in an order of magnitude performance improvement.
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