| 摘要 |
<p>720,128. Automatic current-control systems. BRITISH THOMSON-HOUSTON CO., Ltd. Aug. 4, 1953 [Sept. 22, 1952], No. 23706/52. Class 38 (4). [Also in Group XXXVI] The direct current flowing in a bus-bar from a D.C. generator is maintained constant by using the magnetic field surrounding the busbar to vary the saturation of an inductor carrying an alternating current, the controlled alternating current being rectified to control the field of the D.C. generator. The detector, Fig. 1, consists of a steel yoke 2 surrounding the bus-bar 1, and an inductor core 3 of " Mumetal" (Registered Trade Mark) carrying opposed A.C. windings 4a, 4b connected in series. This inductor may be rotated about a vertical axis to vary the air gaps and so vary the range of current to be detected. To control the bus-bar current, the A.C. signal current is supplied to one field 7a, Fig. 3, of an amplidyne generator via a rectifier, and the other field 7b is supplied from the same A.C. source through a component 9 with a voltage- and frequencycurrent characteristic similar to the controlled inductor 8.</p> |
