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1. 发明专利

GB189920328A Improvements in or relating to Dynamo-electric Generators or Transformers. 未知
公开(公告)号：GB189920328A
公开(公告)日：1900-03-10
申请号：GB189920328D
申请日：1899-10-10
申请人： ROBISON JOHN KEELER
发明人： ROBISON JOHN KEELER
摘要： 20,328. Robison, J. K. Oct. 10. Converting alternating and direct currents; transformers.-Relates to machines which may be used for converting single or multiple alternating currents into unidirectional currents, or vice versÔ. The invention consists essentially in winding the field magnets of a generator in such a manner as to produce an alternating polarity, and exciting them by means of alternating currents, while the armature is rotated at such a speed that the number of field poles multiplied by the number of revolutions per minute is equal to the number of alternations per minute of the exciting current. Fig. 1 shows a simple form of the apparatus, consisting of a bipolar generator A in combination with a bipolar alternating-current exciter B. The field coils a of the generator are connected in series with the armature c of the exciter, while the shunt and series field coils b and f of the exciter are connected with the armature g of the generator and with the supply mains n, n . Both armatures may be mounted on the same shaft, or their shafts may be geared together, so as to ensure synchronous rotation, and the armatures are rendered capable of angular adjustment relatively to each other by mounting them on sleeves secured to the shaft by set-screws. A secondary battery E, arranged in a branch circuit, may be employed for starting, or it may be used for exciting the generator when it is required to supply alternating currents. Switches r and m are provided for throwing in or out the battery and exciter respectively. The machine for converting multiphase alternating currents into unidirectional currents or vice versÔ consists, for example, of three dynamos in combination with a three-phase alternating-current exciter, the armatures of which are all mounted adjustably on the same shaft, the dynamo armatures being set at angles to one another equal to the differences of phase between the fields. The field coils of the three dynamos are connected in three-phase relation with the armature of the exciter, while the three armatures are connected in series with one another and with the field of the exciter. This organization exercises a regulating- influence upon the unidirectional currents supplied to the mains.

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