US1508088A - Electricity meter - Google Patents

Description

Sept. 9. 1924. 1,508,088 5. Z. DE FERRANTI ET AL v ELECTRI CITY METER Filed Jan. 21. 1921 "3 Sheets-Sheet 1 Sept. 9 1924.

. 1,508,088 8. Z. DE FERRANTI ET AL ELECTRICITY METER Filed Jan.

3 Sheets-Sheet 2 Ill/0611210136 Z- 'anzm'b G. ZIZa/L& WM

J'bT/y Sept. 9 1924.

5. Z. DE FERRANTL ET AL .ELWQRI CITY METER 3 Sheets-Sheet 5 Filed Jan. 21 1921 Patented Sept. 9, 1924.

UNlTE lit SEBASTIAN ZIANI DE FER-RANT]: AND GEORGE WALL, OF HOLLINWQOD, ENGLANDv ASSIGNOBS TO FEBBANTI LIMITED, OF HOLLINWOOD, ENGLAND.

ELECTRICITY METER.

Application filed January 21, 1921. Serial No.439,008.

To all whom it may concern.

Be it known that we, SEBASTIAN ZIANI DE FERRANTI and GEORGE WALL, both subjects of the King of Great Britain and Ireland, and both residing at Hollinwood, in the county of Lancaster, England, have invented certain new and useful Improvements Relating to Electricity Meters (for which we have filed an application in England January-17, 1920, Patent No. 165,133), of which the following is a specification.

This invention relates to the adjustment of electrical instruments including, for instance, integrating meters, indicating instruments and relays, and has for its object to provide simple and predetermined adjusting devices therefor.

The features of our invention which we consider novel and patentable are definitely pointed out in the claims appended hereto.

Referring to the accompanying diagrammatic drawings:

Figures 1 and 2 indicate front and side views respectively of an induction integrat ing electricity meter in which are provided separate low load, full load and inductive load adjustments according to the present invention.

Figures 3 and 4 are similar views of a portion of a similar meter provided with modified full load and inductive load adjustments.

Figures 5 and 5 represent details of a modified low load adjustment. f

Fig. 6 is a vertical section on the line 66 of Fig. 1.

In carrying the invention into effect in one form illustrated by way of example in Figures 1 and 2 as applied to the usual adjustments desirable in an alternating current induction motor meter, we mount the series electromagnet a upon a hinged piece I) for the purpose of effecting adjustment of the full load speed. I

The heel of the hinged piece is provided with a nut 0, into which a screw d is fitted enabling the hinged piece to be rocked upon rotation of the screw. Beneath the screw head and between the heel and meter casing is placed a strong compression spring 5 so that the hinged piece may be held rigidly in any position determined by that of the screw d.

The act of turning the screw is thus to move the series electromagnet a farther from or nearer to the shunt electromagnet 6, thereby decreasing or increasing respectively the rotor speed. w I Alternatively, the full load speed maybe adjusted by the movement between the retarding permanent magnets f of a piece of magnetic material 9, say mild steel, (see Figures 3 and 4). Conveniently this magnetic material 9 is formed of flat section and is mounted in bearings it carried by the permanent magnets, and at one end carries'a projecting arm iof spring steel which itself is provided with a handle j. Beneath this handle is a peg which is capable of engaging in any one of a series of holes formed in the path of movement thereof.

This magnetic piece 9' is situated between the two permanent magnets f and by varying the position in which the handle is placed, so the total retarding efi'ect of the permanent magnets is varied.

The positions of the holes Zc are such as to give, say, 1% adjustment from one hole to the next, the holes being, of course, formed in a suitable plate Z fitted between the permanent magnets.

The spaces between the holes 76 will be. found to be non-uniform, being widest apart when the fiat magnetic piece 9 is approximately parallel to the adjacent limbs of the permanent magnets and being closest to gether'when this magnetic piece is at right angles. I

As regards the low loadadjustment, we use a piece of magnetic material 8 carriedv pivotal-1y upon the centre limb of-the shunt electromagnet c (Figure 1). This member is provided with a spring arm 23 carrying the handle at and peg capable of engaging any of a series of holes 4) in a convenient part of the meter casing. direction causing the magnetic piece to move away from its central or symmetrical position effects increase in low load speed for a, given direction of rotation, and movement of the lever in the reverse direction will effect a decrease in low'load speed for the same direction of rotation. Alternatively we may fix a'magnetic piece m, say of mild steel (see Figure 5), to "a non-magnetic slide Movement of this arm in a bar awhich is adapted to be moved laterally in relation to the shunt electromagnet c. This magnetic piece m is pressed into contact with the centre limb of the shunt magnet by means of small compression springs 0 (Fig- The slide is adapted to be moved by means of a'screw p fitted-to the meter frame and carrying an'eccentric portion engaging a slotprovided in the cranked end of the slide. This operating screw carries a small pointer q and a scale r mounted upon the slide serves to indicate the position in which the screw rests.

The magnetic piece m is thus capable 0 being moved towards or away fromdts central or symmetrical positionby partialrotation of the screw 29.

Upon the scale-r are graduationsso placed mutually as to give equal percentage adjustment between consecutivemarks.

As regardsadjustment tor-inductive load, we conductor-:preiierably in the form of acopperstamping to (as indicated-in Fig ure 1) to acranlred slide piece :12, the stamp.- ing' surrounding the lower portion of the shunt -magnet core. The crankedislide :is provided withslots-g engaging; pins 2. litted to the meter casing, compression springs (not shown) fitted beneath washers 6-.(Figure 1) being'carriedon tllGS( :Pll1Sg2Li1(l adapted to press the-slide-firmlya against suitable surfaces on the meter casing At the lower end of theslide a slot 1 is provided with which an eccentric-screw 2 engages. Tliis'eccentrio screw operates the slide in a manner exactly'simi lar tothatdescribed with reference to the low load adjustment indicated in Figures;- 5- and 5, a similar scale and pointer being provided in this case also.v

In operation upon turning" the;scr'ew 2 in one "direction the sli'derrcois li'fted-and the cranked end carrying the "copper stamping wmoved upwards in relation to the shunt magnet c. This upward movement of the copper stamping increases the speed on inductive load.

Movement of thex-screw in the reverse direction causes an opposite effect.

Alternatively asindicated in Figures 3 and we may" carry the-coppel: stamping 1w upon a spri-ng'leveinfi pivoted to they-meter cas" the spring leverinthiscaseais; provided with a" knobil" and peg, the latter engaging any hole of the-series formed in: a suitable part of the; meter casing.

The retarding magnets are so; disposed in relation toeach other. a-ndto the rotor disc as to give maximum;brakingeflect; We are thus enabled to use amin-imum; quantity of steel for the desired speed of; rotation.

It will be appreciated that by means of the adjustments according to the-present in ventionthe operation of" calibrating: the

1,eos,oss

meter. is greatly simplified; e. g. assuming a meter has been tested and found to read 3% slow, then it is merely necessary to move the corresponding" adjustment 3% in the opposite or' fast direction when a substantially correctly reading meter is attained without the necessity for retesting.

Having now particularly described and ascertained the nature of our said invention and in what manner the sameisto be per formed we declare that what we claim is 2-- 1. An electricity meter including a movable-rotor, element; :a series electro-ma'gnet coil on one-side thereof a three-limbed mane neticcore on the other side thereof a shunt coil on; the centre limb oi said magnet core a movable magnetic pole piece mounted adjacent said centre limb, and mean for mo"- ingsaid movable pole piece across the field. thus effecting dis flacement of the magnet c field distribution as desired.

An electricity meter including a movable rOtQr'clement, a series electro-magnet coil on one sidethereot a three-limbed mag:- netic coreon the other side thereof, a shunt coil on the centre limb otsaid magnetic core a movable magnetic pole piece pivoted upon said centre-limb, and means for rocking; said movable pole piece laterally in the field, thus effecting displacement of the magnetic field distribution as desired.

3. An electricity meter including a movable rotor element, a series electro-mac'net coil. on one side thereof, a threedimbed maginetic core on the other side thereof. a shunt coil on the centrelimb of said magnetic core. a movable magnetic pole piece mounted upon a roclrabile arm pivoted upon said cen-r limb, and an indicating;scale-co-acting u an said arm.

4:. Means for adjusting the full loar ting ofian electrical instrument includi movable electro-mag'net.mounted in p onimity' to a rotatable'conducting member, and means for rocking said electro-magnet about ai-fixed axis in a direction substantially at rightangles to the plane of the conducting member.

Ben: electricity meter including a morable rotor element series current electrd magnet core supporting means for said core incorporating a carrying lug-and a projecting lug a fixed supporting lug. pivotal means connecting said supporting lu saidcarrying hip; and manually adju means coasting with 'saidprojectingr hie t efl'ect rocking of said supporting means.

In testimony whereof we have signed our names to this specification.

SEBASTiAl l ZiAlllde FERRAlZTi. GEGRGE WALL.

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