| 摘要 |
1,129,048. Circuit testing. BROWN BOVERI & CO. Ltd. Aug.24, 1966 [Aug. 26, 1965], No.37932/66. Heading G1U. [Also in Division H2] In a synchronous machine having a brushless excitation system comprising a rotary exciting e.g. semi-conductor rectifier 2 with m groups A. . .C each of n parallel current paths a1 ... c4, the integrity of the paths may be checked by an arrangement comprising m. n magnetizable cores 5 on a first peripheral circle 8a of a supporting body 8 rotatable with the machine rotor shaft each core being associated with and in normal operation magnetized by the current is a respective one only of the paths, n stationary pick-off coils 11. . .14 coaxial with and having the same angular spacing as the cores and so arranged that their maximum induction occurs in the region of maximum magnetization of the cores, an inductive core 15 on a second circle 8b of the body 8, m stationary reference pick-off coils R1. . .R3 coaxial with the core and equispaced around the body, and m. n detection channels a11 ... c14 each corresponding to a respective current path and including an AND gate e.g. 22 controlling the channel output and to which gates the pick-off coils are so connected that each channel responds only to the state of the corresponding current path. The rectifiers are fed from the rotating 3Ph. armature windings 1 of a D.C. excited alternate, and each path includes a safety device 3. A lamp L is connected to each channel a11 &c. Figs. 4...7 show alternative structures of the cores and pick-off coils. |
