Transmission of Power; Polyphase System: Tesla Patents (Google eBook)
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1893 Excerpt: ...the generator. Its actual speed, therefore, may be faster or slower than that of t he generator; but it is 55 said to be synchronous so long as it preserves the same relative speed. In carrying out my invention I construct a motor which has a strong tendency to synchronism with the generator. The construe-60 tion which I prefer fot this is that in which the armature is provided with polar proiec-( tions. The field-magnets are wound with two sets of coils, the terminals of which are connected to a switch mechanism, by means of 65 which the line-current may be carried directly through the said coils or indirectly through paths by which its phases are modified. To start such a motor, the switch is turned onto a set of contacts which includes in one motor-70 circuit a dead resistance, in the other an inductive resistance, and, the two circuits being in derivation, it is obvious that the difference in phase of the current in such circuits will set up a rotation of the motor. When the 75 speed of the motor has thus been brought to the desired rate, the switch is shifted tothrow the main current directly through the motorcircuits, and although the currents in both circuits will now be of the same phase the 80 motor will continue to revolve, becoming a true synchronous motor. To secure greater efficiency, I wind thearmature or its polar projections with coils closed on themselves. There are various modifications and impor-85 tant features of this method or plan; but the main principle of the invention will 1k understood from the foregoing. In the drawings, to which I now refer, I have illustrated by the diagrams the general 90 features'of construction and operation which distinguish my invention, Figure 1 being drawn to illustrate the details of the plan above set ...
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alternating currents alternating-current motor annular apparatus application arma armature armature-coils ASSIGNOR Austria-Hungary border country brushes coil F condenser conductors connected construction contact-rings converter core corresponding cuits cylindrical described device diagram difference of phase direct current direction disk duced ELECTRICAL DISTRIBUTION ELECTRO-MAGNETIC MOTOR Emperor of Austria energizing energizing-circuits energizing-coils erator field-coils field-magnet form of motor illustrated independent circuits induced coils insulated ject Letters Patent Lika lines of force magnetic circuits magnetic effect MAGNETIC MOTOR magnetic poles Model mounted nected netic NIKOLA TESLA opposite pairs Patent Office plates polar pole-pieces present invention primary coils produce progressive shifting reference rent resistance result ring secondary coils secured sets of coils shaft Sheets—Sheet shown in Fig Smiljan source of alternating SPECIFICATION forming speed switch synchronizing motor terminals ternating TESLA ELECTRIC COMPANY tion torque motor ture United States Patent wire wound with coils York