Nikola Tesla - Free-Energy Devices

CHAPTER XV.MOTORS WITH CIRCUITS OF DIFFERENT RESISTANCE.As lias been pointed out elsewhere, the lag; or retardation ofthe phases of an alternating current is directly proportional tothe self-induction and inversely proportional to the resistance ofthe circuit through which the current flows. Hence, in orderto secure the proper differences of phase between the two motorcircuits,it is desirable to make the self-induction in one muchhigher and the resistance much lower than the self-induction andresistance, respectively, in the other. At the same time themagnetic quantities of the two poles or sets of poles which thetwo circuits produce should be approximately equal. Theserequirements have led Mr. Tesla to the invention of a motorhaving the following general characteristics : The coils whichare included in that energizing circuit which is to have thehigher self-induction are made of coarse wire,or a conductor ofrelatively low resistance, and with the greatest possible lengthor number of turns. In the other set of coils a comparativelyfew turns of liner wire are used, or a wire of higher resistance.Furthermore, in order to approximate the magnetic quantities ofthe poles excited by these coils, Mr. Tesla employs in the selfinductioncircuit cores much longer than those in the other orresistance circuit.Fig. 65 is a part sectional view of the motor at right angles tothe shaft. Fig. 66 is a diagram of the tield circuits.In Fig. 66, let A represent the coils in one motor circuit, and Hthose in the other. The circuit A is to have the higher selfinduction.There are, therefore, used a long length or a largenumber of turns of coarse wire in forming the coils of this circuit.For the circuit B, a smaller conductor isemployed, or aconductor of a higher resistance than copper, such as Germansilver or iron, and the coils are wound with fewer turns. In applyingthese coils to a motor, Mr. Tesla builds up a field-magnet ofplates c, of iron and steel, secured together in the usual manner