US1275796A - Electrical regulator. - Google Patents

Description

A. A. TIRRILL.

ELECTRICAL REGULATOR.

APPLICATION FILED JUNE 19, l9l5.

1,275,796. Patented Au a'lsls.

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WITNESSES INVENTOR ATTORNEY UNITED STATES PATENT OFFICE.

ALLEiq' .L TmnILL, or rirhsnunen, rmmsrnvnma, nssienon T0 wnsrmeiiousn I ELECTRIC AND MANUFIACTUBING comrm, n conrona'rron or PENNSYLVANIA.

ELECTRICAL REGULATOR.

7 Specification of Letters Patent.

Patented Aug. 13, 1918.

Original application filed October 5, 1911, Serial No. 653,010. Divided and this application filed June 19,

' 1915. Serial 110,135,118. a x

To all whom it may concern:

Be it known that I, ALLEN A. TIRRILL, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Electrical Regulators, of which the following is a speci-.

fication, this application being a division of application Serial No. 653,010, filed October 5, 1911.

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

Figure l of the accompanying drawing is a diagrammatic view of a system of distribution embodying my invention, and Figs. 2 and 3 represent modified forms of the main control element of the regulator.

A system in connection with which the present invention may be conveniently em-- ployed comprises a main generator having an armature 1 that is connected to a suitable distributing circuit 234 and afield magnet winding 5 that is supplied with exciting current from an emitter 6. The exciter is provided with afield magnet winding 7 that is preferably shunt excited though it may be supplied with current from any other suitable source, and in series with the said field magnet winding is a resistor 8 that is adapted to be shunted by means of cooperating stationary and movable contact terminals 9 and 10 of a relay 11 constituting a part of'the regulator. I

The regulator comprises, further a stationary contact terminal 12 that is resiliently mounted, as by being supported upon the end of a plate spring 13, and a cotiperating movable contact terminal 14: that is mounted upon one end of a lever 15. The lever 15 is pivotally supported by a lever 16, havinga stationary fulcrum'a't 16 and is actuated by an electromagnet winding 17 that is energized from the circuit 234;, as, for instance, by being connected through a transformer. 18 to the conductors 2 and 3. When thus connected, it is energized in proportion to the voltage of the distributing circuit. The winding 17 is provided with a core 19 that is pivotally connected to the lever 15 and is partially counter-balanced by trical condition otthe distributing circuit,

which, as illustrated in Fig. 1, is its voltage.-

The lever 16 is-actuated, so as to move the contact terminal 14: into and out of engagement with the stationary contact terminal 12, by means of an electromagnet winding 24 having a core 25, the said core being drawn downwardly in opposition to the tension of a spring 26 when the winding 24 is sufficiently energized. The movements of the core 25 are preferably retarded, as, for

instance, by means of a dash pct 28. The

Winding 24c-also receives energy from the distributing circuit 23-4, and a lamp 33, or any other suitable resistor, is connected in series therewith, the said resistor being adapted to be shunted by means of cotiperating stationary and movable contact terininals 34 and 3-5 of a relay 36. The relays 11 and 36 are provided with parallel-connected actuating windings 37 and 38, re

spectively, that receive energy from the exciter or any other suitable source, and the circuits of which are governed by the contact terminals 12 and 1 1. I

It will be observed that the construction of the apparatus is such that the contact terminal 14 may be actuated independently by the windings 17 and 24, the winding 17, as before stated, serving to vary the distance of the contact terminal 14 from the terminal 12 in response to variations of an electrical condition of the distributing circuit, and the winding 24 serving to move the contact terminal ltinto and out of engagement with the terminal 12 in accordance with variations of the degree of its energization, which variations are caused by the engagement and will be best understood from a detailed con--v sideration thereof. When,.as illustrated, the contact terminal 14. isout of engagement with the terminal 12, therelay magnet Windings 37 and 38 are not energized and, consequently, the contact terminals 9 and 34 do not engage the terminalslO and 35. The shuntcircuit to the resistor 8 is then interrupted and'the field excitation and voltage of the exciter are diminished, followed by a diminution of the 'field excitation and voltage of the main generator. By reason of the reduction of the voltage of the generator, the winding 17 is energized to a less degree and the contact terminal 14 is accordinglyslightly lowered. When the contact terminals 34 and 35 are not in engagement, the resistor 33 is included in the circuit of the magnet winding 24, with the result that it is less strongly energized, and the spring 26 contact terminal 14 is slightly raised. Upon engagement of the contact terminals 34 and 35, the resistor 33 is shunted and the magnet Winding 24 becomes more strongly energized, with the result that the contact terminal 14 is moved out of engagement with the terminal 12.

The regulator continues to operate in this manner,'the periods of engagement and disengagement of the contact terminals 12 and 14 varying with the position of the contact terminal 14 as determined by the voltage or any other selected electrical condition of the distributing circuit, and in such manner that the said electrical condition will be permitted to vary only slightly from a uniform or required value and will be quickly brought to a condition of stability. By-

reason of the fact that the winding 24 receives energy from the main circuit, rather than from the exciter circuit, and that its circuit is governed by the relay 36, the regulator very quickly and effectively restores the voltage or other electrical condition to its normal value. The operation of the regulator is entirely independent'of the exregulators.

citer voltage and of the consequent delays resulting from the retardation due to the inductance of the exciter field circuit, and the regulator is also unaffected in its operation by commutation troubles of the exciton It also does not require adjustment for different exciter voltages.

In Fig. 2, the movable contact terminal 40 that is carried by the lever 41 is located tothe left of the pivotal connection between the levers, rather than to the right as in Fig. 1. The position of the movable contact terminal, with respect to the pivotal connection between the levers, may be varied according to the desired or requisite conditions of regulation.

A further modified form of the regulator is shown in Fig. 3 in which the lever 43 that is actuated or vibrated by the coil 24 is straight and horizontal an has its fulcrum at one end and the core of the coil 24 susended from its other end. A contact carryng lever 44 is pivotally connected to the lever 43 at an intermediate point thereof.

The connections and operation of this regulator are the same as those of the preceding 1 claim as my invention I I 1. An electrical regulator comprising a pa1r of cooperating stationary and movable contact terminals, a substantially straight and horizontal lever carrying the movable contact terminal, another substantially straight and horizontal lever having a stationary fulcrum, the contact-carrying lever being fulcrumed upon and entirely supported thereby, and electromagnetic means for separately actuating each of said levers.

2. An electrical regulator comprising a pair of cooperating stationary and movable contact terminals, a substantially straight and horizontal lever carrying the movable contact terminal, another substantially straight and horizontal lever having a stationary fulcrum at one end, the contact-carrying lever being fulcrumed'upon and entirely supported thereby, and electromagnetic means for separately actuating each of said levers.

In testimony whereof, I have hereunto subscribed my name-this 18th day of June,

ALLEN A. TIRRILL.

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