Nikola Tesla - Free-Energy Devices

20 INVENTIONS OF NIKOLA TKSLA.the quantityof the shifting magnetism constant, ifespeciallythemagnets are not properly subdivided.To obtain a rotary effort in these motors was the subject oflong thought.In order to secure this result it was necessary tomake such a dispositionthat while the poles of one element ofthe motor are shifted by the alternate currents of the source, thepoles produced upon the other elements should always be maintainedin the proper relation to the former, irrespective of thespeed of the motor. Such a condition exists in a continuouscurrent motor ;but in a synchronous motor, such as described,this condition is fulfilled only when the is speed normal.The object has been attained by placing within the ring a properlysubdivided cylindrical iron core wound with several independentcoils closed upon themselves. Two coils at right angles asFIG. 14.6in Fig. 14, are sufficient, but a greater number may be advantageouslyemployed. It results from this dispositionthat whenthe poles of the ring are shifted, currents are generated in theclosed armature coils. These currents are the most intense at ornear the points of the greatest density of the lines of force, andtheir effect is to produce poles upon the armature at right anglesto those of the ring,at least theoretically so;and since this actionis entirely independent of the speed that is, as far as the locationof the poles is concerned a continuous pull is exerted upon theperiphery of the armature. In many respects these motors aresimilar to the continuous current motors. If load isput on, thespeed, and also the resistance of the motor, is diminished andmore current is made to pass through the energizing coils, thus