US1147688A - Electrical regulator. - Google Patents

Description

0' S.-SCHAIRER.

ELECTRICAL REGULATOR. APPLICATION FILED 0015,1911. RENEWED APR. 14. 191 5.

Patented July 20, 1915.

warm -n, it 7H r- M's than OTTO S. SCI-IAIRER, OIELEDGEVGQD PARK, EENNSYLVAWIA. ASSIGNOR TO=YVESTING- HOUSE ELECTRIC AND MANUFACTURING COMPAI SYLVANIA.

ELECTRICAL REGULAC?QR.

Specification of Letters Patent.

Application filed October 5, 1911, Serial No. 652,997 Renewed April 14, 1815. Serial l'lc. 21,-l52.

T all whom it may concern:

Be it known that l, O'r'ro S. SCI-IAIRER, a. citizen of the United States, and a resident of Edgewood Park, in the county. of Allegheny and State of Pennsylvania, have inventedL a new and useful Improvement in Electrical Regulators of which the following is a specification.

My invention relates to electrical regulators, and it has for its object to provide a simple and exceptionally eiiective regulator of the kind in which the regulation is effected by adjustment of the field excitation of a dynamo-electric machine.

Figure 1 of the accompanying drawing diagrammatically illustrates a system embodying my invention, and Fi similarly illustrates a system embodying a modification of the regulator of Fig. l. p

A system in connection with which the present invention may be conveniently em ployed comprises an alternating current generator the armature 1 of which is connected to a suitable distributing circuit 234. and the field magnet winding 5 of which is supplied with exciting current from the armature G of an exciter. lhe field magnet winding 7 of the exciter is preferably shunt excited though it may be supplied with current from any other suitable source, and series tl'ierewith is a resistor 8, the terminals ot which are respectively connected to a pair of cooperating stationary and movable terminal members 9 and 10,1vhich constitute parts of a relay 11. The movable contact terminal 10 is normally maintained out of engagement with terminal 9 by means of a spring 12, and is drawn into engagementthereWit-h when an actuating winding 13 for the relay is energized, the said winding being supplied with currentfrom the exciter, or from any other suitable source.

The circuit of relay-actuating winding 13 is controlled by a pair of coiiperating contact terminals 15 and 16, the terminal 15 being resiliently mounted, as, for instance by being carried at the free extremity of plate spring 17, the other end of the spring being clamped to a stationary post 18. Ti lie contact terminal 143 is mounted upon one end of a lever 19 that is pivoted one end to another lever having an intermediate The contact terfulcrum or pivot at 21. minal 16 is normally held 111 engagement with terminal 15 by means of a spring 22,

and is adapted to be moved out of engage ment therewith by means of an electromagnet windingflih havinga core 2- that is secured to the lever 19, the movements of the lever 19 and attached parts being somewhat retardedby means of a dash pot The windin 2S and the dash pot are carried by the lever 20 so that the winding 23 may efl'ect movements of the contact terminal 16 independently of any movements of lever 20 around its fulcrum point.

The winding 23 is supplied with current from the distributing circuit 23-1 through a transformer 26, and its circuit is controlled by tire engagement and disengagement of a pair of coiiperating stationary and movable contact terminals 27 and v i lhe contact terminals 27 and 28 constitute parts of a relay 29 that is similar in construction to the relay 11 and is provided with an actuating winding 30 that is con nected in parallel with the actuating windinn- 13 of the relay 11, so that its circuit is controlled in a similarmanner.

'ihe lever 20 is adapted to be moved upon its fulcrum point by means of an electromagnet winding 32 that is supplied with current proportional to the voltage or" the circuit 3 l, and is provided with a core 33 that is suspended from the lever 30. the movements of core 33 and of lever 20 being preferably somewhat retarded by means of a dash pot 3:1. The weight of the core 33 is partially counterbalanced by means of an adjustable counterweight r" While the -various parts of the regulator may be disposedin any other convenient or desired relation with respect to each other, I prefer the arrangement shown. in which the coil 23 is suspended from the lever 20 directly below its fulcrum point. With this arrangementno counter-balancing means for the coil is nercssaryand the movements of the coil are minimized with the result that its inertia becomes a relatively unimportant factor.

As the winding: 32 is continuously supplied 'ith energizing current from the circuit 23 l, it serves to alter the position or the lever 20, and also the distance between contact terminals 15 and 1G. in accordance witlrvariations of the voltage of the circuit The windin Qi-l being intermittently eneiyegized so es to move the A CURPORATION OF PENN- Patented duly 2t}, H9353 permitted because the terminal member 15 1s resiliently mounted.

The manner in which the regulator operates will be best understood from a somewhat detailed consideration thereof. If the voltage of the circuit 231 becomes reduced,- as, for instance, because of a sudden increase of load, the winding 32 becomes less strongly energized, with the result that the contact terminal 16 is moved closer to the terminal 15. \Vhen the circuit of the winding 23is interrupted the-spring 22 serves to draw the contact terminal 16 into engagement with the terminal 15, whereupon the relay actuating winding 13 and becomes energized, and the contact terminals 10 and 28 are thereby moved into engagement with the terminals 9 and 27, respectively. The

engagement of terminals 9 and 10 establishes a shunt to the resistor 8, with the result that the excitation and voltage of the .exciter are increased, followed by corresponding increases of the excitation and voltage of the main generator, the increase of the main generator voltage serving to compensate for the reduction of the voltage of the circuit 2-3-4, previously assumed toexist. The increase of the main generator voltage causes the winding 32 to be more strongly energized, with the result that the eon tact terminal 16 is raised slightly. Upon eggageme nt of the contact terminals 27 and 28, the winding 23 becomes energized and tlie'eontact terminal 16 is moved out of engagementwiththe terminal 15, in opposition tothe tension of the spring 22. -When the contact terminals 15 and 16 are out of engagement,- the relay actuating windings 13 and .30 become deenergized and the contact terminals 10 and 28 move out of engagement with the terminals 9'and 27, followed by diminutions of the voltages of the exciter and main generator and by denergization of the winding 23.

The regulator continues to operate in this manner,'the contact terminal 16 being moved into and out. of engagement with terminal 15 by the winding 23, and the periods of engagement. and disengagement of the said terminals being determined by the winding Copies otthis patent may be obtained for Me 32 in accordance with variations of the voltage of the distributing circuit, and in such a manner that the voltage of the said circuit will be maintained substantially uniform, and that the said voltage will be promptly restored testability and itsnormal value when sudden or violent fluctuations thereof result from any cause. Since, in the regulator of Fig. l, the coil 23 is located directly below the pivotal point of the lever 22, its movements will be substantially entirely .lat eral, and, consequently, the said coil. may be stationarily supported, if desired, instead of being carried by the lever 20, as shown.

In the system of Fig. 2, the coil 28 is mounted upon one end of the main regulator .lever 37, rather than directly below its ful' crum point, and the auxiliary lever 38 is mounted upon the same pivot pin as the lever 37, but so as to be movable independently thereof, or upon a separate pivot preferably arranged with its axis in alinement with the axis of the pivot of the lever 37, though it is not necessarily in alinement therewith. The connections and operation of the regulator of Fig. 2 are the same as of the regulator of Fig. 1.

\Vhile the regulator has been shown as adapted to effect voltage regulation only, it will be readily understood thatit is not liniited in its application to such specific use but may be employed, without departing from the spirit of the invention, for the regulation of any other electrical. quantity, andin accordance with variations of any other desired electrical condition, by simple modifications that may be made by anyone skilled in the art.

I claim as my invention:

1. An electrical regulator comprising 00- operating contact members, an electromagnetic actuator for one of said members, a lever carrying the said actuator substantially directly below its fulcrum, and an electromagnetic actuator for the lever.

2. An electrical regulator comprising cooperating contact members, a lever having a stationary fulcrum carrying one of said members, an electromagnetic actuator for the said lever, a second lever also having a stationary fulcrum and carrying the said actuator, and an electromagnetic actuator for the said second lever.

In testimony whereof, I have hereunto subscribed my name this 29th day of Sept.

VVnsLnY G. CARR, B. B. I-Invns.

cents each, by addressing the Commissioner of Patents. .Gzington, D. G.

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