Патент USA US2412811код для вставки
' Patented Dec.-17, 1946 ‘2,412,811 UNITED STATES PATENT OFFICE CARBON PILE ELECTRI'C REGULATOR. James H. Johnston, Rldge?eld ‘Park, N. J., as» slgnor to Bendix Aviation Corporation, Teter box-o, N. J ., a corporation of Delaware Application April 4, 1944, Serial No. 529,494 8 Claims. . (Cl. 201':—51) 1 The present invention deals with electrical reg ulators and is concerned primarily with regulators of the so-called “carbon pile” type. At the present time carbon pile regulators have come into widespread use for such purposes as controlling the voltage of the output of generators and also in the governing of current. All of these carbon pile regulators operate on the prin» cip-le of varying the pressure applied to the car . 2 ing through this bore and freely movable there in, is a rod, one extremity of which is anchored to the armature, while the other extremity car ries some adjustable form of stop, such as a nut, which engages the core. It is evident that with such an arrangement, movement of the arma ture towards the pile is de?nitely limited and the limit may be adjusted by adjusting the nut. In conditionsof actual use, it has been found bon pile, the range of effective pressure on the 10 desirable to make the stop which limits the move ment of the armature of a yieldable nature, as 'Ihere has now come into fairly widespread use such an arrangement ‘tends particularly to pro a regulator which is characterized as including long the life of the carbon pile. Accordingly, a the usual carbon pile, one end of which is rela further object is the provision, in a carbon pile tively ?xed. Operatively associated with the 15 regulator of the character above set forth, of other end to apply pressure on the pile, is an yieldable means for limiting movement of the armature and this armature is carried by a spring armature towards the pile. pile being the regulating range of the regulator. of the leaf type, and the extremities of which This end is achieved by incorporating in the mechanism above described an expansion spring. 20 which is disposed about the rod and interposed The force of the electromagnet is rendered‘ between the end of the core and the nut. The effective on the armature. It is evident that the force of this spring opposes the force of the leaf spring above referred to tends to urge the arma spring carrying the armature and its effect is to ture towards the pile, while the magnetic force provide a yielding stop for the armature. tends to withdraw the armature from the pile. 25 ‘ Various other more detailed objects of the in- I The difference between these two forces is the vention such as arise in carrying out the above regulating force or working force on the pile. noted thoughts in a practical embodiment will in With carbon pile regulators of this type some part become apparent and in part be hereinafter di?iculty has been experienced in obtaining de stated as the description of the invention pro-v sired regulating effects in that under many con 30 seeds. ditions the pile is compressed to such an extent The invention, therefore, comprises a carbon engage an abutment or top surfacev of an electro magnet. as to cause its resistance to fall beneath a de pile electric regulator, including an electromag sired minimum. Thus, if the regulator is em net having a core with which is operatively asso ployed as a voltage regulator, this undue decrease ciated an armature. The armature is carried by in the resistance of the pile causes the voltage -_ a leaf spring, the extremities of which engage to rise beyond a safe limit. Moreover, with no the top of the electromagnet. The position of ?xed limit on the extent to which the pile may this armature determines the pressure on the car be compressed, chattering and vibration occurs, bon pile. The core is formed with a bore through which is a highly undesirable factor. which extends a rod, one end of which is anchored With these conditions in mind, this invention to the armature, and the other end of which car has in view as an important object, the provision, ries a stop in the form of a nut which engages in an electric regulator of the character afore the end of the core. In a modi?ed form a coiled said, of means for limiting movement of the expansion spring may be interposed between the armature towards the pile whereby de?nite assur ance is had that the pile will not be compressed beyond a predetermined safe limit. core and the nut. ' For a full and more complete understanding of _ the invention, reference may be had to the fol More in detail, the invention has as an object lowing description and accompanying drawing, the provision, in a carbon pile regulator of the wherein: , ‘ type above noted, 01' limiting means for the arma Fig. 1 is asection through those parts of a car ture which is adjustable in nature, so that the ex 50 bon pile regulator with which this invention is tent to which the pile may be compressed may immediately concerned; and be varied as desired. Fig. 2 is a. similar sectional view of a modi In carrying out this idea in a practical embodi i'lcation. ment, the core 01' the electromagnet is provided Referring now to the drawing, wherein like with a bore extending axially thereof. Extend 55 reference characters denote-corresponding parts, aei'aeii and ?rst more particularly to Fig. 1, an electro With this arrangement all of the desired regu magnet is referred to in its entirety by the refer- ' , lating effects of the carbon pile regulator are ' ence character E. This electromagnet comprises the usual pot made up of a cylindrical wall to, bottom it, top 92 and upper peripheral ?ange 83. The top i2 is provided with the usual cen ‘ tral opening which is preferably conical in shape, as illustrated, and which is designated l6. - maintained, but at the same time these regulat ing e?ects are rendered more stable and all chattering is substantially eliminated. It is evie‘ , dent that by properly adjusting the nuts 2? and 28, any desired operating range oi’ regulation may be established. _ T1 the form of the invention disclosed in Fig. 2, coaxial therewith, the bottom it is formed with 10 all of the parts described above in connection with Fig. 1 are repeated. However, in order to a threaded opening 95. Screwed into the thread render the stop or limit of movement for the ed opening i5 is a core it, the upper extremity armature 2B of a yielding nature, an expansion of which extends into the opening ill. The core . coil spring 29 is disposed about the rod 25 and . ' i6 is provided with a bore H! which extends there throughout. Assembled within the cylindrical 15 interposed between the nut 21 and the core H6. The force of this spring 29' opposes that of wall It and between the bottom and top walls ' the spring assembly 2!. It is evident that the ti and i2 is the usual solenoid winding which is armature 26 may move towardsthe pile C, but identi?ed by the reference character S. this movement is resisted by the spring 29 in addi Carried on the upper face of the top wall l2, and preferably in engagement with the periph 20 tion to the magnetic force. As the armature moves further awayfrom the core, the magnetic eral ?ange I3 is an abutment ring IS, the ex force decreases in strength but the resistance posed surface of which has a slight taper to of the spring 29 becomes progressively greater. provide the conical formation depicted at it. It is evident that the movement of the arma An armature is indicated at 20 and is carried by a leaf spring assembly 2!. It will be noted 25 ture is limited, although not in so positive a that the springs M are of slightly arched or ' nature. Moreover, the presence of the spring 29 exhibits a de?nite tendency to dampen vibra bowed shape and the free ends of this spring tions on the part of the armature. rest against‘ the upper surface ill of the abut While two preferred embodiments of the in ment I8. They also ?t within the peripheral ?ange 13 with a reasonably snug ?t, so that in 30 vention are hereinbefore set forth, it is to be clearly understood that the invention is not to the assembled relation the armature 20 is prop be limited to the exact construction illustrated erly centered with respect to the core HE. and described, because various modi?cations of A boss 22 is carried by backing plate 23 which these details may be provided in putting‘the in bears against the upper face of the spring as sembly 2i. Any appropriate fastening element, 35 vention into practice within the purview of the appended claims.’ ' . such as the screws shown at 24, may be employed What is claimed is: to assemble the plate 23, springs 2| and armature 1. In an electric regulator including a carbon 20, as a unit. The boss 22 engages the lower pile, an armature, a spring carried by said arma end of a carbon pile which is designated C. The carbon pile C and solenoid 8' may be con 40 ture for compressing said pile, and an electro magnet, the‘ improvement consisting of stop nected into an electrical circuit in any way to means for limiting movement of said armature provide the desired regulating e?ects. When towards said pile, said stop means being so ar used as a voltage regulator for a generator, the ' ranged as to limit the compression of said pile to ‘ pile C will be placed‘ in series with the shunt a permissible value substantially less than its ?eld of the generator, while the solenoid S will maximum value and a permissible value such as be connected in across the generator. Thus, as to prevent a decrease in the resistance of the pile the voltage across the generator varies, so will be to below a predetermined safe value. voltage in the solenoid S. Y _ 2. In an electric regulator including a carbon The intensity of the magnetic ?eld of the elec tromagnet E is thereby caused to vary with the 50 pile, an armature having means engaging one end of said pile to apply pressure thereon, a spring voltage, and will be effective to in turn vary the carrying said armature, said spring being ar _ position of the armature 20. It is evident that Substantially oppositeto the opening lél'and as the armature 20 applies more pressure to the _ ranged so as to compress said pile, an electromag net supporting said spring, and a core ?xedly mounted as a part of said electromagnet; the im provement comprising stop means carried by said armature and arranged so as to be engageable by from exceeding a safe limit, the stop now to be ' said ?xedly mounted core to limit movement of described is provided. 7 said armature towards said pile and the maxi h A rod 25 is threaded at each end. One end mum extent of compression of the pile by said 60 of this rod is screwed into a complemcntal thread spring to a value su?icient to prevent a decrease ed socket in the armature 20, as indicated at 28. _ r in the resistance of the pile below a predeter This anchors this end of the rod to the arma mined safe value. ture. The’ other end of the rod '25 carries a , 3. In an electric regulator including a carbon . nut 2'! which engages the end of the core I6. pile, an armature having means engaging one end .This nut 21 may be accompanied by a lock nut of said pile to apply pressure thereon, a spring 28, so that when an adjusted position is once set, carrying said armature, said spring being ar ranged so-as to compress said pile, an electro it will be maintained. magnet supporting said spring, and a core in With this arrangement it is evident that the armature 20 can move towards the pile C only up 70 cluded as a part of said electromagnet, said core being provided with a bore, a rod freely movable to the point where the nut 21 engages the core, in said bore and having one end anchored to said any further movement being positively inhibited armature, and a stop carried by the other end of ‘ ' by the stop- arrangement. Thus, the voltage may said rod for engaging said core so” as to limit the be prevented from rising beyond a predetermined 75 maximum extent of_ compression of the pile by safe limit. carbon pile C, its resistance decreases, which in turn makes the ?eld stronger and thus causes the voltage'to rise. To prevent this voltage rise I 2,412,011 5 said spring to a value su?icient to prevent a de crease in the resistance of the pile to below a pre determined safe value. 4. In an electric regulator including a carbon pile, an armature having means engaging one end of said pile to apply pressure thereon, a spring carrying said armature and applying pressure to said pile through said armature for compressing the pile, an electromagnet supporting said spring, , and a core included as a part of said electromag net, said core being formed with/a bore, a rod freely movable in said bore and having one'end a part of said electromagnet, and spring means operably connected to said armature and bearing upon said core for yieldably opposing movement of said armature towards said pile and limiting the maximum compression of said pile to within a-predetermined safe operating range. '7. In an electric regulator including a carbon pile, an armature having means engaging one end of said pile to apply pressure thereon, a spring carrying said armature, an electromagnet sup porting said spring, and a core included as a part of said electromagnet, said core being formed anchored to said armature, the otherend of said with a bore, a rod freely movable in said bore and having one end anchored to said armature, a stop threaded end and forming a stop adapted to en-, carried by the other end of said rod, an expan gage said core to determine the limit of movement sion spring associated with said rod and posi of said armature towards said pile, said nut being tioned between said stop and said core so as to arranged so as to be adjustable exteriorly of said bias said armature in a direction tending to with regulator for increasing and decreasing the ini draw said armature from said pile, and the stop tial pressure applied to said pile by said spring so 20 and expansion spring on the other end of said rod as to vary the maximum permissible compres for limiting the maximum compression of said rod being threaded and a nut carried on said sion'of said pile. 5. In an electric regulator including a carbon pile to within a predetermined safe operating. range. _ pile, an armature, a spring carried by said arma 8. In an electric regulator including a carbon ture for biasing the armature so as to compress 25 pile, an armature having meansengaging one end said pile, and an electromagnet, said ?rst men of said pile to apply pressure thereon, a spring tioned spring opposing movement of said ‘arma carrying said armature, an electromagnet sup ture toward said electromagnet; the improve porting said spring, and a ctre included as a part ment comprising an additional yieldable spring of said electromagnet, said core being formed means operably connected intermediate said elec 30 with a bore, a rod freely movable in said bore and tromagnet and armature so as to oppose move ment of said armature towards said pile and ar ranged so as to limit the compression of said pile by said ?rst mentioned spring to a value substan tially less than its maximum and a limited value 35 sufiicient to prevent a decrease in the resistance of the pile below a predetermined safe value. 6. In an electric regulator including a carbon pile, an armature having means engaging one end of said pile to apply pressure thereon, a spring carrying said armature,_ an electromagnet sup porting said spring, and a core ?xedly mounted as having one end anchored to said armature, a nut . threaded on the other end of said rod and form ing a stop for limiting movement of said armature in a pile compressing direction, and a coil expan sion spring disposed about said rod and inter posed between said ‘core and nut and tending to oppose movement of said armature in a pile com pressing direction so as to limit the maximum compression of said pile to within a predeter mined safe operating range. JAMES H. JOHNSTON.