No. 808,552, L. J. E PON TOIS, PATENTEDENTED DEC, 26, 1905i. , APPLICATION EILED SEPT, 24, 904, 3 SHEETS-SHEET ,

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No. 808,552. L. J. L.E PON TOIS, PATENTED DEC, 26, 1905, MAGNETO ALTERNATOR, APPLICATION FILED SEPT, 24, 1904,

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No. 808,552, L. J. LEPON TOIS, PATENTED DEC, 26, 1905. MAGNETO ALTERNATOR, APPLICATION FILED SEPT, 24, 1904.

3 SEEETS-SHEET 3. UNITED STATES PATENT OFFICE. LEON JULES LE PONTOIS, OF NEW ROCHELLE, NEW YORK, ASSIGNOR TO. POLY-PHASE IGNITION SYSTEM COMPANY, A CORPORATION OF NEW YORK. MAGNETO-ALTERNATOR. No. 808,552. Specification of Letters Patent. Patented Dec. 26, 1905. Application filed September 24, 1904, Serial No. 225,853, To all whom, it may concern: 10, permanently magnetized. These lami Be it known that I, LEON JuLEs LE PON nae are made fast on the drum by being 55 TOIs, a citizen of the Republic of France, and clamped between the rim S and the screw a resident of New Rochelle, Westchester ring 9. By suitable magnetization two con county, New York, have invented a certain sequent poles N and S are developed at op new and useful Improvement in Magneto posite ends of the same diameter. The , of which the following is a speci laminae 10 are made slightly elliptical in fication. shape in order to better concentrate the mag My invention relates to a polyphase mag netic flux at the ends of the same diameter neto-alternator designed to deliver to suit and to decrease as much as possible the mag able sparking devices two alternating cur netic leakage which would otherwise take rents having jointly or singly sufficient en place between the magnetized ring and the ergy to cause the ignition of explosive mix iron ring constituting the . By this tures according to my Patent No. 752,690, means I obtain a very homogeneous perma dated February 23, 1904. ment thoroughly and evenly mag Owing to the fact that it is difficult to con netized throughout its entire mass. The struct simple alternating-current generators laminae are insulated from each other by a 7 o having collectors and moving coils, I have suitable coating of varnish, so as to diminish constructed an apparatus, one form of which as much as possible magnetic short-circuits is illustrated herein, with stationary coils which might be formed between two contigu and a rotating field, using a special form of ous laminae owing to differences in their mag permanent magnet for the field in order to netic potential, also to diminish the eddy-cur 75 avoid the necessity of exciting the same by rents which would otherwise take place direct current through their mass owing to the stator arma 25 In the following I have shown with refer ture reactions. ence to the accompanying drawings a struc Aring 13, of soft-ironlaminae 14, having four ture illustrating one form of my invention, oppositely-disposed polar projections 15, is the features thereof being more fully pointed clamped to the casing 1 by means of insulated out hereinafter in the claims. bolts 16. Coils 17 are wound around ring 13 In the drawings, Figure 1 is a sectional between the polar projections 15, the oppo view of my improved polyphase magneto sitely-disposed coils being connected to alternator on the plane of the line AB of Fig. gether either in series orin parallel, thus form 2. Fig. 2 is a sectional view of the same on ing two distinct circuits in which currents the plane of the line CD of Fig. 1. Figs. 3, differing in phase from each other by ninety 35 4, 5, 6, and 7 are diagrammatic views show degrees are generated, as shown hereinafter. ing the distribution of the An oil-well 18 is provided in the casing 1 a through the stator while the moves loose ring 19 resting on the shaft and depend 90 through an angle of one hundred and eighty ing into the oil-well acting as a medium for degrees; and Fig. 8 is a diagrammatic view carrying the oil to the shaft. The shaft is showing the respective values of the two al adapted to be rotated by any convenient ternating currents generated. means through pulley 20, keyed to the shaft. Similar reference characters indicate simi The sleeve of the pulley and the shaft itself 95 lar parts in the several views. are each provided with oil-grooves 21 for pre Referring to the drawings, the numeral 1 venting the surplus oil from Working out into 45 designates the outer casing of non-magnetic the casing and causing the same to drip of material, which casing is provided with an and return to the oil-well through oil-ducts inturned projection 2, adapted to receive the 22 and 23, respectively. A cover 24 is adapted IOC elongated bearing 3 of the shaft 4. A drum to be fastened to the front of the casing by 5, made of non-magnetic material, is rigidly means of suitable screws 25 and serves as a mounted on the end of shaft 4 by means of support for the binding-posts 26, adapted to the hub 6, which hub is preferably drop receive the terminals of the coils. forged with the shaft. The drum 5 supports To facilitate an understanding of the mode I o5 a ring 7, formed of a number of steel laminae of generating currents by the apparatus above

808,552 described, reference may be had to the dia are formed at opposite ends of the same di grammatic views Figs. 3 to 7, inclusive, which ameter. show the changes in the distribution of the 2. A polyphase alternator comprising a magnetic field threading through the four rotor consisting of a permanent magnet hav 5 stationary coils while the field-magnet rotates ing a plurality of Separately-magnetized steel through an angle of one hundred and eighty laminae substantially annular in shape, said degrees. An inspection of these figures shows magnet having polar projections at opposite 45 that the intensity of the magnetic flux thread ends of the same diameter. ing through opposite coils a? a passes from 3. A polyphase alternator comprising a IO minimum in Fig. 3 to maximum in Fig. 5, re stationary soft-iron laminated ring having a Verting to a minimum in Fig. 7, after having plurality of polar prejections, stationary coils passed through intermediate values in Figs. wound on Said ring between said polar projec 4 and 6. In the same manner the magnetic tions, and a rotor consisting of a permanent flux threading through the opposite coils b' magnet having a plurality of separately-mag b°undergoes similar variations; but it will be netized steel laminae substantially annular in noticed that this variation occurs ninety de shape and SO magnetized that two consequent grees before or after similar variations occur poles are formed at opposite ends of the same in the intensity of the magnetic field thread diameter. ing through the coils a? a. 4. A polyphase alternator comprising a According to the well-known law of induc stationary soft-iron laminated ring having tion the two alternating currents,respectively, four polar projections, stationary coils wound generated in the circuits of the coils a? a b' b” on said ring between said polar projections OO must differin phase from each other by ninety the opposite coils being connected in series or degrees, and are therefore suitable for the in parallel to form two independent circuits, 25 production of sparks for the ignition of ex and an annular permanent magnet adapted plosive mixtures according to my Patent No. to be rotated within the ring, said permanent 752,690. Fig. 8 represents diagrammatically magnet consisting of a plurality of separately the simultaneous values of the two alternat magnetized steel laminae substantially annu ing currents delivered by each circuit during lar in shape and SO magnetized that two con a revolution of the rotor through an angle of sequent poles are formed at opposite ends of One hundred and eighty degrees. the same diameter. What I claim, and desire to secure by Let In witness whereof I have hereunto signed 7 c. ters Patent, is my name in the presence of two subscribing 1. A polyphase alternator comprising a Witnesses. 35 Totor consisting of a permanent magnet hav LEON JULES IE PON TOIS. ing a plurality of separately-magnetized steel Witnesses: laminae Substantially annular in shape and E. F. PORTER, SO magnetized that two consequent poles CHARLES S. JONES.