US1336619A - John l - Google Patents

Description

J. L. CREVELING.

ELECTRIC SYSTEM.

APPLICATION FILED OCT. 7, 1916.

1,336,61 9. Patented Apr. 13, 1920.

' I INVENTOR! UNITED STATES PATENT OFFICE.

JOHN L. CBEVELING, OF TUCSON, ARIZONA, ASSIGNQR TO GOULD COUPLERCOllIPAN'Y, A CORPORATION OF NEW YORK.

ELECTRIC SYSTEM.

Applmation filed October To all whom it may concern: l? Be-it known that 1, JOHN L. CREVELING, a citizen of the Unitedv States, residing in Tucson, Arizona, have invented certain new and useful Improvements in Electric Systems, of which the following is a dQSCIlP tion.

,i My inventionpertains to that class of electric systems used in connection withprime movers to assist in the proper operation of the rime mover. .1 y invention is particularly applicable to systems employing a prime mover of the internal combustion type wherein the explosive mixture is fired by means of an electric spark normally caused by current generated by a dynamo electric machine driven by the prime mover and subject to wide variations in speedf My invention is particularly applicable to such systems wherein the engine has to be stopped and started or driven at low speed,

A and wherein it is therefore desirable that the field strength of the spark producing dynamo should at times be as g'reatas possible and at other times somewhat weaker for the purpose of regulation for speed changes,

and wherein insurance of correct magnetic polarity of the field is desired. 4

' In the drawing, Figure I is a diagram matic representation of one type of system embodying the essentials of my invention.

Fig. II is a dia rammatic representation,

of the system of ig. I during a different phase of its operation than depicted". in Fig. I.

In Fig. I, 1 diagrammatically illustrates a pair of the usual sparking points such as are provided in the usual commerclal spark plug. As many spark plugs, of course, as are necessary may be provided for the 'pr1 me mover, and any suitable type of distrlbutlng means may be used for placing them in circuit with the secondary 2 of any suitable type of induction coil or transformer wlnch may be connected up as usual 'Wltll lts reinaining terminal grounded as indicated.

The primary winding 3 has one of itsterminals connected as by wire 4 with a brush 5 in electrical communication with the segment 6 of a special two-segment commutator, the function of which will hereinafter I more plainly appear. The segment 6'is connected with the winding 7 diagrammatically shown as a single inductor carried by the 7, 1916. Serial No. 124,355.

armature structure 8. The'oppositeend of the windin 7 is con-nected with any suitable type 0 slip ring as indicated at 9, from which the wire 10 is carried to a make and break device or pair of contact points indicated. at 11 and operated by any suitable type of cam connected with the prime mover and indicated at 12. The wire 13 is carried from one side of the'n ake andbreak device 11to the brush 14 bearing upon the segment 15 of the commutator, which is in i'communication with the brush 16 which may be grounded-as indicated at 17. The winding 7 may be of any suitable type for producing a proper ignition current, but I prefor to use a'two-part commutator in connection therewith and operate in a bi-polar field,'and for this reason prefer to employ the usual magneto or shuttle type of winding. The armature structure 8 is provided with a suitable direct current winding which may be of any desired type connected with the commutator 18, the positive brush of which is connected as by wire 19 with the re posite terminal connected as by wire 24 with the positive side of the storage battery- 25 and lamps or other translating devices as indicated at 26. The negative terminals of the battery 25 and translating devices 26 may be grounded as, indicated at 27 The coil 22 opposes the magnetomot'ive force of the coil 21 when traversed by current from the generator to the battery 25 and assists the winding 21 when current flows from the battery 25 back through the coil 22. Any suitable type of switch may be used for cutting the. generator into circuit when the voltage is slightly above that of the battery, and cutting it out of circuit when its voltage falls slightly below that of the storage battery, and may be placed for example in the lead 19, as indicated. It is obvious that any suitable switch may also be usedfor preventing the battery current from flowing through the primary ignition circuit when the prime mover is at rest and currentis not wanted, and may for example to be placed as indicated in wire 28,

As the particular types or positions of these switches are not a part of my present invention, all details thereof are purposely omitted for the sake of brevity, and it is intended merely to indicate the presence of proper devices for the purposes indicated and which may be placed where most desirable.

In Fig. II like numerals are used to indicate like parts, but the armature structure 8 is shown in such position that the inductor 7 is setting up an electromotive force in a direction opposed to that indicated in Fig.

I, and the commutator connected therewithis in proper position for this phase of op eration, and it will be noted that the brushes 5 and 14 are now in electrical communication with each other through segment 15 of the commutator, while segment 6 of the commutator, connected with the end of the winding 7, is in electrical communication with the brush 16.

An operation of my invention is as follows:

Supposing the prime mover to be running ata normal operating speed and the dynamo electric machine therefor operating also at a normal speed, and that when the 'arma ture 8 is in the position diagrammatically portrayed in Fig. I the electromotive force set up in the winding 7 is in the direction of the arrows indicated thereupon, then current will flow from the winding 7 to the slip ring 9, wire 10, make and break device 11, wire 13 and brush 14 to the segment 15, and thence from brush 16 to ground, and from ground to wire 20, through the direct current windings upon the armature structure 8, through wire 19, wire 28, primary winding 3, wire 4, brush 5, to COIXlIlllltfitOP'SG ment 6, and thence back to the winding And it will thus be noted that the direct current windings upon the armature structure 8 and the ignition winding 7 upon the said armature structure 8 are operating in series with each other, in such manner as to increase the electromotive force impressed across the terminals of the primary winding 3. Current will also flow from the direct current windings upon the structure 8, through wire 19, wire 23, coil 22 and wire 24 to the storage battery 25 and lam s or other translating devices 26, when suc i are in circuit, andreturn from these devices will be through the ground, as indicated at 27,.

to the ground connection of the direct current winding throu h wire 20. The current passing through coil 22 to the storage battery and translating devices will oppose the' magnetomotive force of the shunt or energizing coil 21 in such manner as to hold the generator output which traverses the said winding 22 fromiexceeding to any considerable degree a predetermined maximum current throughout wide increases in speed, as

a the entire system is regulated automatically with sufiicient accuracy for practical purposes throughout all the speed changes to be met with from the critical operating speed to the maximum speed to be attained.

In that phase of the operation shown in Fig. II, the direct current windings of the armature 8 and their cooperating parts of the system will operate as outlined above with respect to Fig. I, but the electromotive force set up in the inductor 75will' be in the opposite direction, as indicated by 'the arrows thereupon, and current will now flow from inductor 7 to segment 6, and through brush 16 to ground, and return through wire 20, direct currentwindings upon the struc ture 8, wire 19, wire 28, primary winding 3, wire 4 and brush 5 to segment 15, and then to brush 14 through wire 13 to contact device -11, then through wire, 10 and collector 9 to the inductor-7. And it will be noted that while the connection between the inductor 7- and the direct current windings of the armature 8 has been so altered that the electromotive forces of both sets of armature windings are additive and in the same direction with respect to their external circuit, the current traversing the make and break device 11 has its direction reversed, which will prevent uneven wearin or burning away of the contact points. hroughout increases in speed above the normal, the above outlined operation will be continued, and these operations will continue throughout decreases in speed until the armature is revolving so slowly that the direct current windin set up an electromotive force only approximately equal to that of the storage battery when a portion of the current then supplied to the circuit containing the pr1mary3 will be supplied by the battery operating in multiple with the direct current armature windings. This current will flow back through the winding 22in such manner as to increase the field excitation and tend to keep up the voltage of the direct current winding so that the same will equal that of the battery at as lowuspeed as possible, and this increase of the field strength will also increase the voltage generated by the inductor 7 and tend to increase the sparking current caused thereby, and thus assist in compensating for the lower armature speed.- If the speed falls still lower, the voltage of the direct current windings will be beprimary 3, which will continue to flowv through the winding 22 in such direction as to tend to increase the electromotive force generatedin the winding 7, and alsotend to cause the direct current windings to reach thkelir normal voltage at as low speed as poss1 e. I

From the foregoing it will be noted that I have produced a system wherein the alternating current inductors always are assisted either by the battery or the direct current windings to cause a high eletromotive force to be impiessed upon the primary 3, and that at low speed the magnetic field is strengthened so as to increase the electromotive force set up in both sets of inductors whereby the electromotive force impressed upon the primary winding 3 is greater than usual throughout wide changes in speed, and that by automatically and simultaneously reversing the current through the make and break points I eliminate considerable of the usual wear upon the same.

I do not wish in any way to limit myself to any of the exact constructions or details of operation given above to illustrate one embodiment of my invention, for it will be obvious that wide departure may be made without departing from the spirit and scope thereof.

I am acquainted with application No. 38,848 of John W. Jepson, and it is not intended to herein claim any of the subjectmatter of said application.

What I claim is:

1. In a system of the class described having an ignition circuit with a battery, an ignition armature and interrupter in said circuit, a commutator acting to control the connections between the battery and said ignition armature to maintain the voltageof each in uniform direction to build up the ignition circuit, and means whereby current flowing from the battery to said ignition circuit assists in increasing the electromotive force set up by said ignition armature.

2. In a system of the class described having an ignition circuit with a battery, an ignition armature and interrupter in said circuit, a commutator acting to control the connections between the battery and said ignition armature to maintain the voltage of each in uniform direction to build up the ig nition circuit, and means whereby current flowing from the battery to said ignition circuit assists in increasing the electromotive force set up by said ignition armature combined with armature windings con nected in circuit with the battery to charge the same. and assisted by said battery.

3. In a system of the class described having an ignition circuit with a battery, an ignition armature and interrupter 1n sald circuit, a commutator acting to control the connections between the battery and said ignition armature to maintain the voltage of each in uniform direction to build up the ignition circuit, and means whereby current flowing from the battery to saidignit1on circiut asslsts in increasing the electro- ',motive force setup by said ignition armarelation, an induction means having its primary in series in said circuit and its secondary connected to supply ignition devices, means controlling theconnections between the battery and the armature to maintain their electromotive forces additive when conointly supplying the current to the induct1on means, and means whereby the current from the battery also tends to augment the electromotive force of the generating windmgs.

5. A system of the class described having an ignition circuit containing a battery, generatlng armature and induction means in series, means whereby said induction means supplies current for ignition purposes, and means whereby ignition current supplied by the battery magnetically afi'ects the generatmg armature.

6. The combination with ignition means, of current afiected means for operating the same, an armature winding for supplying current to said means, a storage battery operating to assist said winding, and means whereby ignition current from said battery magnetically affects said armature winding.

7 The combination with ignition means operated by electric current, of means for supplying current thereto comprehending an armature winding and a storage battery, means whereby current may be supplied by the battery and winding acting conjointly to assist each other, and means whereby that portion of the current supplied by the battery augments the portion furnished by the armature winding.

8. The combination with ignition means operated by electric current, of means for supplying current thereto comprehending an armature winding and a storage battery, means whereby current may be supplied by the battery and winding acting conjointly to assist each other, and means whereby that portion of the current supplied by the battery augments the portion furnished by the armature winding combined with armature windings for charging the said battery.

9. The combination with ignition means operated by electric current, of means for supplying current thereto comprehending an armature winding and a storage battery, means whereby current may be supplied by the battery and winding acting conjointly to assist each other, and means whereby that portion of the current supplied by the battery augments the portion furnished by the armature winding combined with armature windings for charging the said battery and affected by current flowing from said batto 1%. The combinationwith ignition means operated by electric current, of means for supplying current thereto comprehending an armature winding and a storage battery,

the battery.

'to assist each other, and means whereby that portion of the current supplied by the battery augments the portion furnished by 15 the armature winding combined with arma-- ture windings for charging the said battery and aflected by current flowing to and from JOHN L. CREVELING.

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