Nikola Tesla - Free-Energy Devices

CHAPTEK XXII.MOTOR WITH CONDENSER INONE OF THE FIELD CIRCUITS.IF THE field or energizingcircuits of a rotary phase motor beboth derived from the same source of alternating currents and acondenser of proper capacity be included in one of the same, approximately,the desired difference of phase may be obtained betweenthe currents flowing directly from the source and thoseflowing through the condenser but the; great size and expenseof condensers for this purpose that would meet the requirementsof the ordinary systems of comparatively low potential are particularlyprohibitory to their employment.Another, now well-known, method or plan of securing a differenceof phase between the energizing currents of motors of thiskind is to induce by the currents in one circuit those in the othercircuit or circuits ;but as no means had been proposed thatwould secure in this way between the phases of the primary orinducing and the secondary or induced currents that differencetheoretically ninety degrees that is best adapted for practicaland economical working, Mr. Tesla devised a means which renderspracticable both the above described plans or methods, andby which he is enabled to obtain an economical and efficient alternatingcurrent motor. His invention consists in placing acondenser in the secondary or induced circuit of the motor abovedescribed and raising the potential of the secondary currents tosuch a degree that the capacity of the condenser, which is inpart dependent on the potential, need be quite small. The valueof this condenser is determined in a well-understood manner withreference to the self-induction and other conditions of the circuit,so as to cause the currents which pass throughit to differ fromthe primary currents by a quarter phase.Fig. 91 illustrates the invention as embodied in a motorin which the inductive relation of the primary and secondarycircuits is secured by winding them inside the motor partlyupon the same cores ;but the invention applies, generally,to