The U.S. Patents of Nikola Tesla

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The same results may obtained the form illustrated iu Figs. Four wires connect the motor-terminals and with the brushes and 20 g', respectively. When the generator ro­ tated, the coil Gwill the certain point shown in the drawings be" generating its maximum current, while coil neutral. In the ease motors wound withindepend- 13c eut field and armature circuits and operated by shifting their poles, described said I . These coils are wound right angles, that while one crossing the strongest portion of. These magnetic cores or 63 poles are wound with insulated coils (7, tlie diametrically-opposite coils being connected together series and their free ends brought to terminals respectively. advantageous also to slot these plates longitudinally, prevent the formation eddy currents and waste 85 energy. cylindrical other armature containing the independent coils G'. The coils terminate the two pairs of insulated collecting-rings/and/',upon which bear the brushes g'. They io are permanently magnetized and opposite polarity. For instance, the armature-coils,or those which the currents 120 are set induction,may held stationary and the alternating currents from the genera­ tor conducted through the rotating inducing or field coils means suitable sliding con­ tacts. In Fig. The same principle operation may ap- 55 plied motors various forms, and have shown one such modified forms Figs. and however, forming polar pro- 105 jections the field and armature cores.202,279 2 \ tive positions. these figures, M' are field-magnets secured forming part of frame, mounted base, These 60 magnets should laminated composed of a number electrically-insulated magnetic sections, prevent the circulation induced currents and render them capable rapid magnetic changes. From what has now been given the opera­ tion this apparatus will readily under­ stood. This progression continues for a quarter-revolution until coil becomes 45 neutral and coil produces its maximum current. 115 Obviously the principle this invention is capable many modified applications,most of which follow matter course from the constructions described. The 35 current from the coil G', being conveyed to the terminals and through coils O', has a tendency establish poles right angles to those set the coils but owing to the greater effect the current coils 0 40 the result merely advance the xroles from the position which they would remain if due the magnetizing influence coils C C alone. Thus currents are induced iu the closed circuits the core, which, energiz­ ing the core strongly, maintain powerful at- 95 traction between the same and the field,which causes rotation the armature the direc­ tion which the resultant poles are shifted. This results even and perfect action the apparatus. Between the poles there mounted, iii bearingsin the cross­ pieces G", cylindrical iron core, which, 70 in order prevent the formation eddying currents, and the loss consequent thereon, is subdivided the usual way. Insulated con­ ductors coils are applied the cylinder D longitudinally, and for these may employ 75 copper plates E', which are secured the sides and ends the cylindrical core well- known ways. 3. also apparent that the induced 125 coils may movable and the magnetic parts of the motor stationary; but have illustrated these modifications fully the application to which reference lias herein been made. are the poles pole-pieces of alternating-current generator. The action described then re­ peated, the poles having been shifted through one-half the field,or half-revolution. the drawings two 80 of such circuits areshown, formed respectively by the conductors and. Let as­ sumed that this current conveyed from the 25 rings/ the terminals and through the coils Its effect will establish poles in the ring midway between the two coils. The second half revolution accomplished a 50 similar way, the same polarity being main­ tained the shifting poles the movement of the generator -coils alternately through fields opposite polarity. the 15 field force the other the neutral point. and that con- 100 centrated and powerful field obtained and a remarkably powerful tendency rotation in the armature secured. In order that the system whole may be better understood, shall now describe the 5 mode plan devised for producing the currents that effect the progressive shifting of the poles the motor. the binding-posts are connected the proper circuits from the generator cause go a progressive shifting the resultant mag­ netic poles produced the magnets upon the armature. E', which are insu­ lated from each other. By the further rotation the generator the coil brought within the influence the 30 field and begins produce current, which grows stronger the said coil approaches the maximum points the field, while the current produced the coil diminishes as the said coil recedes from those points. The particular advantage the construc­ tion illustrated Figs. and the drawings. These plates conductors may form one preferably several independent circuits around the core. When these motors are not loaded, but run­ ning free, the rotation ofthe armature nearly synchronous with the rotation the poles of the field, and under these circumstances very nc; little current perceptible the coils E'; but load added the speed tends di­ minish and the currents coils are aug­ mented, that the rotary effort increased proportionately