US1741137A - Magneto-electric generator - Google Patents

Description

Dec 24, 1929. E. B. NOWOSIELSKI 1,741,137

MAGNETO ELECTRIC GENERATOR Filed April 22, 1924 2 Sheets-Sheet l INVENTOR [aw/1:0 5. MWdS/ILS'K/ A rmmvsr Dec. 24, 1929. E. B. NOWOSIELSKI MAGNETO ELECTRIC GENERATOR Filed April 22, 1924 2 Sheets-Sheet 2 Patented Dec. 24, 1929 UNITED STATES PATENT OFFICE EDWARD B. NONOSIELSKI, OF BLOOIVIFIELD, NEW JERSEY, ASSIGNOR TO SYLITDORF ELECTRICAL COMPANY, OF NEWARK, NEW JERSEY MAGNETO-ELECTRIC GENERATOR Application filed April 22, 1924. Serial No. 708,138.

. My invention relates to electric generators, particularly of the magneto type used for ignition purposes on internal combustion engines. In my Patent 1,477,8 1? issued Decemher 18, 1923, I have shown and described the fundamental form of generator in which there is a primary magnetic field structure, comprising the permanent magnets and pole pieces associated therewith; a secondary magnetic field structure, comprising a coil core structure with pole pieces associated therewith; and a rotor movable between the two fields structures for producing flux changes in the secondary field structure. In

t my previously mentioned patent, one generatmg 0011 is used which is placed within the arch of the magnets substantially parallel to the axis of the rotor.

It is the principal object of my present application to improve on the arrangement shown in my previously mentioned patent by utilizing to the greatest extent that I now know to be possible, the same base and rotor structure to obtain a generator having the ability to deliver two simultaneous sparks where only one was possible before. Or

stated in another way, it is the object of this invention to produce with the same fundamental parts a double generator for the purpose of obtaining twice as many sparks with substantially no increase in weight.

It will be apparent at once that the accomplishment of such an object means considerable not only in the cost of equipment, but in the weight carried by an aeroplane engine;

the idea being to eliminate one of the magnetos, it being customary to use double ignition units in order primarily to secure a large factor ofsafety. Ordinarily the high tension coil in an ignition unit is themost vulnerable drives that must be provided from the engine, thereby reducing the cost and simplifying the installation.

Another object of my invention is to provide an arrangement of the parts so that they the means of locking the two parts of the coil core structure together.

Figure 5 is a schematic drawing of the circuits of the machine; while Figure 6 is a diagrammatic illustration of the switch lever used in connection with the switch shown in Fig. 5.

Referring now to the details wherein like numbers refer to corresponding parts in the various views, 1 is a base or housing structure within which the rotor 2 is positioned, being supported on bearings at either end, one bearing 3 being carried in the drive end plate 4 and the other bearing 5 being carried in the end plate 6. These plates are fastened together and to the base or housing 1 by means of suitable through bolts, two of which are shown at 7 and 8. The housing 1 carries pole pieces on which rest the magnets 9, all as described in my previously mentioned patent, and a cover 10 for covering and clamping the magnets in place is held to the base by the eye bolts 11 and clamping nuts 12. The magnets with their associated pole pieces constitute what may be termed the primary magnetic field. A secondary magnetic field is composed of the coil core structure with the two stationary pole pieces 18 and 14 which are positioned in tandem in the top of the rotor housing. Positioned on these pole pieces is a core structure made up of two parts 15 and 16 which are shown in dott d lines under the generating coils 17 and 18. C ne end oi? the core tor ninates in pole face that engages the pole piece 13, and the lower end of the core 16 terminates in pole face 20 that engages the pole piece 1 1. The upper end of the core 15 is constructed to form what is equivalent to a bent end 21 and the other end of the core 16 is constructed to form what equivalent to a bent end 22. The ends 21 and 92 are preferably shaped somewh dovet. il as indicated at 23 (see 1) and a clamping; date 531 is adapted to pass over these ends so that when the nut 25, on the hold-down bolt 28 fastened to the base, is tightened, the core ends 21 and 22 are drawn solidly together and the core faces 19 and 20 are clamped against the pole pieces 13 and 1 1-. it bei understood that there are two of the hold-down bolts W3, one on either side of the core. In addition to the hold-down bolts 26, clamps 2'? and 28 may also be utilized to assist in holding the coil and core structures in position.

The distribution of the magnetic flux oi? the magnets 9 by means of the rotor through the coil and core structure will not be 'iirther described herein, as it is clearly set forth in my previously mentioned patent, but in my present application each the coils 1'5 and 18 is made up of primary P and secondary S, which is the ordinary construction of a high tension coil. Both ends of the primary are insulated from the core and broup'ht out,

one end 01": the primary 1'? to a terminal. carries in a block of insulating material 30 and the corresponding end of. the other primary coil to a terminal 31. One end of the primary winding P of the coil 1? is brought out to a condenser terminal 82 and by means of a conductor 33 to an insulated adjustable contact 8 1, which cooperates with a contact carried by a movable breaker arm 3f The breaker arm 36 is pivotally mounted on a stud carried on a circuit breaker plate 37. The corresponding end of the primary oi? coil 18 is brought out to a condenser stud 88 and by means of a conductor 39 continued on to the insulated adjustable contact 10, which cooperates with the movable contact 41 carried on the circuit breaker lever d2, which also is pivoted to the breaker plate 37.

The two condensers are illustrated by the numbers and ll, the opposite ends of which are grounded on the frame of the magneto through a mounting clip 45 carried on the stud 16. The circuit breaker levers 36 and 12 are actuated simultaneously by the cam 4.? carried on the end of the rotor shaft. One end of each of the secondary windings is grounded directly to the core, while each of the other ends is brought out, one to the ter minal 18 and the other to the terminal 19 carried in the block of insulating; material 30, from which terminals connections are taken to independent distributor's mounted on and driven by the engine. The terminal block 30 is carrieo on a cover plate 50, on the lower part of which is mounted a breaker cover plate 51, which as illustrated is screw threaded into a hole in the plate 50, lugs 5 body; on the plate 51 for assisting in screwing the cover into position in the plate Ii. advance and retard is desired, the plate 51 is prorided with a stub shaft 52 to which an advance lower 66 is attached. Elie inner end oi the stub shaft 5:2 has a connecting link 53 that is adapted to engage stud 5 1: which is securely fastened to the circuit breaker plate 37, this latter plate being held in position by the studs passing through the slots 58 in the breaker plate. In some cases the driving end plate 1 is provided with a dowel 57, for fitting in an engine plate, and lugs o8 having slots 59 therein by means of which the herd structure of the magn eto may be shifted with respect to the rotor for timing; with the engine. lVhen the lever 6 is not used. then the circuit breaker plate 37 is fastened in a lined position to {rive the maximum result from the coil wini'lings. The circuit breaker lo ers 36 and 42 are each provided with a felt wiper 60, which is oiled and this carries a certain amount of lubricant to the cam that may be made of any suitable materia I prefor to use in the arrangement herein described a cam made of hard insulating material.

The control of the magneto is brought about through the medium of a switch which is diagrammaucally illustrated as 61. The switch lever, as shown in Fig. 6, is made up 01" contact levers 6:2, (33 and 6s. The switch lever is permanently grounded to the frame of the switch, which in turn is grounded, and by grounded I mean connected to some part of the engine framework. It will be apparent that when the switch lever and the contacts (i2, and 6d are in the position A (Fig. 5) the ends oi both primary windings are grounded, and both coils then deliver sparks from their secondary winding". In the position B, the switch blade (33 is out of contact and only the blades 62 and (34: make engagement, thereby grounding only the primary of coil 18. In the position C, the coil 18 is out out due to the prin'iary being o en circuited and the coil 1? alone functions; while in position D of the switch both primaries are open circuited and the generator is rendered inert. This arrangement allows the operator to test either one of his coils to see that they are both in good working condition, which is highly essential for aviation work.

It might be further mentioned that while the lugs 58, with their associated slots 59, are used for timing the magneto with the engine when the advance lever 66 is not used and the circuit breaker plate 317 is held in a fixed position, the lugs are also used. for clamping the magneto to the engine mounting plate in which the dowel 57 fits.

While I have shown one preferred arrangement of the parts entering into my invention, it will be clearly apparent that the details may be varied over a wide range and I, therefore, do not wish to be limited, except as limited by the claims appended hereto.

Having thus described my invention, what I claim is:

1. In a magneto electric generator of the type described, a base structure forming a housing carrying a rotor therein and having a pair of pole pieces fixed in tandem in the top of the housing and forming a part thereof, a core structure carried on said pole pieces with means including said rotor for shifting magnetic flux through said core; further characterized in that, the core structure comprises two limbs each having at one end a pole face engaging one of'said pole pieces set in the housing and at the other end a bent portion, with means for clamping said bent portions securely together, said clamping means also assisting in holding the core structure to said pole pieces set in the housing, and further characterized in that each limb care ries a primary and secondary winding thereon, independent breaker contacts for controlling each of said primary windings and each secondary adapted to be connected to independent distributors as and for the purpose described. i

2. In a magneto electric generator of the type described, a base structure forming a housing carrying a rotor therein and having a pair of pole pieces fixed in tandem in the top of the housing and forming a part thereof, a core structure carried on said pole pieces with means including said rotor for shifting magnetic flux through said core; further characterized in that, the core structure comprises two parts having portions to engage said pole pieces set in the housing and also having portions adapted to be brought to-' gether with means for drawing and holding together said two portions and the two parts to said pole pieces and further characterized in that each part of said core carries a primary and secondary winding, an independent set of breaker contacts for controlling each primary winding with an associated condenser and each secondary being adapted for connection to independent distributers.

3. In amagneto electric generator, a primary magnetic field structure, a stationary secondary magnetic field structure composed of a pair of pole pieces and a two part core structure mounted on said pole pieces and provided with means for holding said core structure together and to said pole pieces, a rotor movable between said two field structures for producing flux changes in the secondary field structure, a primary Winding on each part of core structure, an independent set of breaker contacts for controlling the said primary winding on each part of the core with an associated condenser and a secondary winding on each part of the core structure and adapted to be connected each to its own distributer.

4. A double magneto electric genertor comprising two independent pole pieces and a tWo part core structure securely held together and to said pole pieces, a rotor for carrying magnetic flux to said pole pieces and core structure, primary and secondary windings on each part of the core structure, two independent circuit breakers and condensers connected one each to one end of each of said primaries, the other end of said primaries being brought out and adapted to be grounded both together or separately or open circuited by a control switch, one end of said secondaries being brought out for connection to independent current distributers, and means carried by the rotor structure for actuating said circuit breakers.

In testimony whereof, I aifix my signature.

EDWARD B. NOWOSIELSKI.

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