US1039543A - High-tension magneto-electric machine. - Google Patents

Description

W. 0. KENNINGTON.

HIGH TENSION MAGNETO ELECTRIC MACHINE.

APPLICATION FILED OUT. 10, 1911.

Patented Sept; 24, 1912.

iww In llll I!! I 5 is 85 fla [NI/EN TOR Allarneyo UNITED STATES PATENT OFFICE.

WILLIALT KENNINGTON, OF BLOOMFIELD, NEW JERSEY, ASSIGNOB TO SIMMS MAGNETO CO. INC., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK..

HIGH-TENSION MAGNETIC-ELECTRIC MACHINE.

Specification of Letters Patent.

Application filed October 10, 1911. Serial No. 653,974.

T0 at! whom it may concern:

Be it known that I, VILLIAM O. IQEN N ING' ION, a subject of the King of England, citizen of London, England, residing at Bloomfield, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in High-Tension ltIagneto-Electric Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention consists in the novel features hereinafter described reference being had to the accompanying drawings which show one form .or embodiment of the invention which I have selected for purposes of illustration, and the invention is fully disclosed in the following description and claims.

The'object of my invention is to provide.

a high'tension magnet-0' electric machine, the armature of which has two maximum or sparking positions in each .half revolution I complished by the peculiar construction of neto electric machine embodying my inven tion, as is necessary for a clear understanding of my invent-ion. F ig. 2 is a perspective view of one of the pole shoes detached.

In the drawing, 1 represents the magnets of the magneto, which ha e their poles provided with the pole picces 2, '3, surrounding the rotary armature, the core of which is shown at 10 and which is pro ided with the usual primary winding 11 and secondary winding 12, the windings being-represented diagrammatically. Each pole piece is provided with an extended portion 2 at one end the other end being cut off and terminating in a vertically disposed face 2". Each of the pole pieces is provided with a longitudinally extending angular recess .3 having a vertically disposed face 3 and a horizontally disposed face 3*. For convenience in forming the pole shoe, I prefer to have the vertically disposed face 3 in exact alincment, or. in the same vertically disposed plane as the face 2 at the other end of the pole piece, and the face 3 perpendicular'to the face 3, whereby the faces 2", 3 and S -may be formed by a single cut of a suitable milling tool, but I do not limitmyself to this exact construction.

The effect of the longitudinal grooves or recesses 3, is to provide two points in the revolution of the armature, where the greatest number of lines of force are cut by the coils of the armature, the one, as the coils leave the adjacent edge of the faces 8*, and the other as they leave the inner edge of the adjacent edge of the faces 3. It is also'advantageous to arrange that of the two maxi mum positions, the retarded position will be best for low speed and the advance position will be best for high speed, and to acconr' plish this the trailing tips of the extensions 2 of the pole shoe are cut off adjacent to each end of the shoe leaving inclined face-s4.

Patented Sept. 24, 191

This causes a greater reluctance to the flux I at full retard at a high speed of the armature compared with the reluctance at full ad vance. It follows therefore, that withthe armature rotating at slow speed, with the' circuit breaker or interrupter for the pri mary circuit at full retard, the best spark will be produced, and in fact with this con struction the spark so produced at slow speed is as hot as the spark produced when the magneto armature is rotating at full speed.

When the armature is rotated at high speed the spark is advanced, so that the primary circuit is broken just before the coils leave the edges of the faces 3 where the best spark is obtainednnder the conditions of high speedf My improvement is adapted particularly to magneto electric machines for use in connection with ignition devices for internal combustion engines, especially those used in auromobilesand other vehicles, and it is obvious that in cranking the engine and in running at slow speeds a full spark will be furnished for the ignition of the explosive charges, in the cylinders, by throwing the timing lever of the circuit breaker into the retarded position. I do not however, limit myself toithe use of the invention for these purposes.

It willgbe understood that the magneto will be provided with the usual or anypreferred form of circuit breaker for the primary circuit, provided with means such as a timing lever, for advancing or retarding the spark in the cycle of the armature and as these devices'are so well understood, I have not considered it necessary to illustrate any particular form of circuit breaker or tiining'lever for this purpose. I may, for example, employ the form of contact breaker and timing-lever used in the well known Simms high tension magneto electric machine, and shown for example in the British patent to Simms No. 1263 of W rat {claim and desire to secure by Letters .ldatcnt 1 l; In magneto electric machine, the combination with the magnet thereof, c a pole shoe for the magnet having one extremity extended in direction around the armm tnre beyond the other extremity, the inner face of said pole shoe being provided adjacent to the extended extremity thereof with a transversely extending recess, to enablethe armature coils" to cut substantially the greatest number of line's of force at two dif forent positions in each revolution thereof, while passing said 'shoe. e

2. in a magneto electric machine, the combination with the magnet thereof, of a pole shoe for the magnet having one extremity extended in a direction around the armature beyond the other extremity, the inner face of said pole shoe being provided adjacentto the extended extremity thereof with a transversely extending recess, to enable the armature coils to out substantially the greatest number of lines of force at two different positions in each revolution thereof, and also with means for causing a greater reluet-ance to the magneticfiux in one of said positions than in the :other.

3.- In a magneto electric machine,the combination with the magnet thereof, of a pole shoe for the magnet having one extremity extended in a direction around the armature beyond the other extremity, the inner face of said pole shoe being provided adjacent to the extended extremity thereof with a transversely extending recess, to enable the armature coils to cut substantially the greatest number of lines of force at two diifercnt positions in each revolution thereof, portions of the extended extremity of the pole shoe being cut away to cause a greater reluctance to the magnetic flow at high speed.

4. In a magneto electric machine the combination' with the magnet thereof, of a pole shoe for said magnet having the extremity which is lhst passed by the armature coils, during the rotation thereof extended beyond the other extremity of the shoe, and having a transverse recess in the inner'face of said shoe adjacent to the said extended extremity whereby the armature will be given twb sparking positions. I

5. In a magneto electric machine the combination with the magnet thereof, of a pole shoe for said magnet having the extremity which is last passed by the armature coils, during the rotation thereof extended beyond the other extremity of the shoe, and having a transverse recess in the vinner face of said shoe, adjacent to the said extended extremity wherebythe armature will be given two sparking positions, the said extended extremity of the shoe being of greatest length centrally of the shoe and diminishing in length toward each lateral end thereof, whereby a. greater reluctance to the magnet flux at one position is caused at high speed, than at the otherposition,

6. A pole shoe for high tension magneto electric machines,having a curved inner face for embracing the armature, and having one end extended in a direction around the armature, to a greater extent than the other, said pole piece being provided .with a recess adjacent to said extended portion, said recess extending across the inner face of the pole shoe in a direction substantially parallel to the axis of rotation of the armature.

7. A pole shoe for high tension magneto electric machines, having a curved inner-face for embracing the armature, and having one end extended in a direction around the armature, to a greater extent than the other, said pole piece being provided with a recess adjacent to said extended portion, saidru extending across the inner face of the pole shoe in a direction substantially parallel to the axis of rotation of the'armature, the extremity of said extended port-ion beiiig cut away at each end on'lines disposed angularly to the end face of said extended portion.

8. A high tension magneto electric machine provided with a pole shoe, one end of which is provided with an extended portion, and having adjacent thereto a longitudinal groove or recess provided with a vertically disposed wall, in the plane of the outer face at the other end "of the shoe, said recess having a longitudinally disposed face, disposed substantially perpendicularly tothe said vertically disposed wall.

9. A pole disk for high tension magneto electric machines provided With an extended portion at one end, and having adjacent thereto a longitudinally disposed groove of recess provided with an inner vertically d15- y m-1% wall in the plane of the outer face In testimony whereofI affix my signature,

W tyne ether end of the shoe, and a horizonin the presence of two Witnesses. huh diw pused all @uhstqntinlh' berpendicv 1 J ILI [AM 0. KEN N INGTON. K1121 1' te the 'vertlvally dlsposed Wall, the sald W J 5 extended pmtlon bemg cut away at each end Witnesses:

to term feces mchned to the extreme outer R GER H. BUTTERWORTH,

face thereof; JULIUS EHMANN.

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