US1017597A - Magneto. - Google Patents

Description

J. E. SEELEY.

MAGNETO.

APPLICATION FILED 1:. a1, 1911.

Patentfid. Feb. 13, 1 912.

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operation, the armature according to the hereinafter.

and State of Califor1iia, have invented a lowing is a specification.

' for the construction of an armature in this ure 1 is a longitudinal vertical section of the 'of the. magneto on line w m in Fig. 1.

UNITED STATES g E F CEJ,

JAMES E. SEELEY, or nos ANGELES, CALIFORNIA, ASSIGNOR TO HIGH rnnounivcy IGNITION COIL COMPANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION OF CALIFORNIA.

MAGNETO.

Application filed January 31 1911. Serial No. 605,775.

To all whom it may concern: V

Be it known that I, JAMES E. SEELEY, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles new and useful Magneto, of which the fol- This invention" relates to magnetos for use in connection with sparking systems, for example, in internal combustion engines, and the main object of the invention is to provide a magneto in which electromotive force will be generated effectively throughout a large range, thereby permitting a correspondingly large rangefor advancement of the spark. In order. to provide for such present invention is laminated in planes parallel to the axis of rotation, and the 111- ventio'n is directedparticularly to means manner While providing effective and rigid support and connection of the several parts of the armature.

Other objects of the invention will appear The accompanying .drawings illustrate the invention, and referring thereto: Flglower portion of the magneto embodying the invention. Fig; 2 1s a transverse section Fig. 3 is a perspective of the armature core. 1 designates the base of a magneto, 2 the field magnets thereof, and 3.the polepieces secured to said field magnets and to the base, and embracing the armature.

The armature comprises heads or end members 5 and 6. means for rotatively supporting said heals, a core and pole pieces 8 connecting said'heads. The head 5 may consist of a disk having a hub 9 secured to a shaft 10, said shaft being mounted by bearing-11. in a fixed head 12 on the endof the base, and said shaft being provided with means indicated at 13 for connection to the driving means. Head 6 is secured to a sleeve or hollow shaft 4, through which passes the conductor 19 for connection to the usual current connecting means not shown, said connector being insulated by insulating sleeve 14. Said hollow shaft -1- is journaled by bearing 15 in a head 16 at a corresponding 'end of the base.

The core 70f the armature consists of a plurality of plates or laminations 7, said plates extending in planes parallel to the axis of rotation of the armature. Said plates are preferably H-shaped having a contracted middle portion 17 and extended outer portions or extnsiwns 18 at each end toenable the winding ii dicated at 20, to be wound on said central portion, and between said extensions. Said core may be retained in place by seating or fitting of said extensions in notches 21. iii flanges 22 on the heads 5 and 6. The pole pieces 8, which are formed as segmental plates, fit over said fianges and core, and are .held in place by screws indicated at 23, said pole pieces holding the core from transverse displacement and also connecting the heads 5 and 6 together.

The pole pieces 8 are of sufficient circumferential or angular extension to enable thenrto span the space 24 between the pole pieces 3 of the field magnet. Good results may be obtained by making the angular extension of the armature pole pieces about 88 andthe angular extension of the field magnet pole pieces about 110, giving an overlap of, say 18. With such construction of the pole pieces, I have found thateffective electromotive force is generated in the armature throughout a range of substantially 75. Animportant feature contributing to this result is the arrangement of the laminations in planes parallel to the axis of rotation as distinguished from transverse to said axis. lVith laminations in planes transverse to the axis of rotation, the lines of force through the core tend to concentrate along lincsof minimum length, so that when conditions, the period of maximum electro motive force in the circuit, as the magnetic flux is then changing most rapidly. But with the laminations parallel to the axis of rotation, the lines of force are not permitted to cross obliquely through the core, but substantially follow the laminations, so that when the armature pole pieces are in the positions referred to, the core offers a greater reluctance by reason of the distortlon of the magnetic lines of force, than when the annature pole pieces are directly opposite the fieldpole pieces so as to allow the magnetic flux to pass through the laniinations Without distortion and, therefore, with minimum iresistance. -The effect of this is to increase the magnetic flux continuously, and more or uniformly from the time when the torwerd edge of the armature pole piececoines under the rear edge of the field pole pieceto the time when the armature pole pieces are directly opposite the field pole pieces, this connorms? What I claim is: in a magneto, the combination with. the tield pole pieces of an nature, mounted to rotate between said pole pieces and comprising heads having o notches, 2-: core consisting of H tot-1n; ninations having arms extending into e tclics the laminations in pieces secured. over and in c, U 'wi In testiniion gz Winn-eo1 my hand Los Angeles, 245th day of January Fit ill.

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