The U.S. Patents of Nikola Tesla

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addition this,the practical difficulty interrupting revers­ ing current any considerable strength is such that none the devices present coaid be made economically practically effect the transmission power reversing the manner described continuous direct cur­ rent. such cases, however, the potential the energizing -currents re­ mains the same, their direction only being changed.of the generator. The same result evidently obtained such a disposition that shown Fig. Having now described the nature in­ vention and some the various ways which 30 may carried into effect, would call attention certain characteristics which the applications the invention possess, and the advantages which offers. 17, where the poles both elements are shifted op- 60 posite directions. The cir­ cuit-connections are established between the rings the generator-shaft and those the motor-shaftby collecting brashes and wires, as 5 previously explained. In Figs. In motor, considering, for convenience, 35 that represented Fig. will observed that since the disk Dhas tendency follow continuously the points ofgreatest attraction, and since these points are shifted around the ring once for each revolution the armature 40 the generator, follows that the move­ ment the disk will synchronous with that the armature This feature by practical demonstration have found ex­ ist all other forms which one revolution 45 the armature the-generator produces a shifting the poles the motor through three hundred and-sixty degree^. pro­ ducing alternating current each impulse of which involves rise and fall potential I reproduce the motor the exact conditions of the generator, and such currents and the consequent production resultant poles the progression the poles will continuous and not intermittent. The difference between the two plans and the advantages mine are obvious. These motors may run series—multi­ ple arc multiple series—under conditions well understood those skilled the art. order properly energize the field-magnet the motor, how­ ever, the connections are made with the armatnre-coils wires leading thereto that while the points ofgreatest attraction great- io est density magnetic lines force upon the armature are shifted i'n one direction those ' upon the field-magnet are madetoprogressin an opposite direction. According invention, how­ ever, employ true alternating currents; and my invention consists the discovery the inode method utilizing such currents. 25 obvious that the same principle may be applied the various typical forms mo­ tor hereinbefore described.' far,then,as the plan acting upon one element the motor concerned, in­ vention involves the use alternating as distinguished froma reversed current,or cur­ rent which, while continuous and direet, is shifted from coil coil any form com­ mutator, reyerser, interrupter. other respects the operation identically the same, the 15 other cases cited. typical the invention, ob­ vious that since the attractive effect upon the disk greatest when the disk its proper 65 relative position the poles developed the ring B—that say, when its ends poles immediately follow those the ring—the speed the motor for all loads within the normal working limits the motor will be practically constant. shaft. se­ cure, first, uniform speed under all loads within the normal working limits the mo­ tor without the use any auxiliary regula­ tor; second, synchronism between the motor and the generator; third, greater efficiency by the more direct application the current, no commutating devices being required either the. Iu the particular modification shown Fig- 15, others-constructed similar plan, 50 the number alternating impulses resulting from one revolution the generator-armature is double compared with the preceding cases, and the polarities the motor are shifted, around twice one revolution the 55 generator-armature,; The speed the motor will therefore twice that . In the drawings the field-coils are shunts to the armature; but they may series or in independent circuits.intermittentlysbifting the poles one its elements. ' Again,considering the apparatus illustrated by Fig. It clearly apparent that the speed can never exceed the arbitrary limit determined byrthe generator, and also that within certain limits, least, the speed the motor will be independent the strength the current.382,280 rings, b', carried its. and 19, for example,the terminals of each set field-coils are connected with the wires the two armature-coils sucha way 2c that the field-coils wi]l maintain opposite poles in advance the poles the armature. It will now more readily seen from the above description how far the requirements of a practical system electrical transmission of power are realized invention. motor the generator; fourth, cheapness and simplicity mechanical construction; fifth, the capability being very easily man­ aged controlled, and, sixth, diminution of danger from injury persons and apparatus. With re­ gard that part the invention which con­ sists actingupon both elements the motor . This arrangement results in increased speed rotation. I aware that not new produce the rotationsof motor by. This has been done passing through independent ener­ gizing-coils one the elements the cur­ rent from battery other source direct or continuous currents, reversing;,such cur­ rent suitable mechanical appliances, that it directed through the coils alternately opposite directions