US984297A - Electric meter. - Google Patents

Description

17 H. PRATT.

ELECTRIC M APPLICATION FILED AYE. no, 1:104,

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Patented Feb. 14, 1911.

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W. H. PRATT. ELECTRIC METER.

APPLICATION FILED APILZO, 1904. 984,297. Patented Feb. 14,1911

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984,297. Patented Feb. 14, 1911 3 $HEETB-BHEET 3.

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Wi messes Irv/ember:

William H. Pratt, I

@YWW $1M 9? UNITED STATES BliflENT OFFICE.

WILLIAM H. PRATT, 0F LYNN, MASSACHUSETTS, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

. ELECTRIC METER.

Specification of Letters Patent. Patenfied'lieb, 14, 1911 Application filed April 20, 1904. Serial No. 204,060.

To all whom it may concern: is supported in the usual manner on jewel it known that l, \VILLIAM H. Pulvr'r, a bearings carried by the member A. The staeitizen of the United States, residing at tionary magnetic circuit consists of two Lynn, county of Essex, and State of Massalaminated cores C and C secured to member chusetts, have invented certain new and use- A by the boltsm. Ihe arrangement of the t'ul Improvements in Electric Meters, of magnetic circuit and its coils will best be whiclrthe following isa specification. understood by reference to Fig. 5. In this My invention relates to alternating-cmtigurc, core C is shown as comprising a cenrent induction meters, and its object to tral member on which is wound the potenprovide a wattmeter of simple and connjiacttial coil I and two parallel portions, each construction, which will operate. etliciently of which nearly completes the magnetic cirand accurately on varying loads and power cuit of the central member, thereby lagging, factors. the current in coil I in the manner well One feature of my invention consists in understood in the art. In other words, the a novel management of magnetic circuit, core C is ol a rectangular shape having a \vlierel'iy a high torque and proper phase central member on which is wound a polar displacement are secured. forall loads and tial coil. the rectangle helm;- interrupted by power factors. I a small air-gap at. each side of one end of Another feature of my invention consists the central core. The core C is of a U- of a novel form of means for counterbalauc shape, each of its poles facing one of the ing' the starting friction. air-gaps in core C. and each carrying there- .\nolher feature of my invention consists on a series coil S. The disk. which is not in a novel arrangement oi the magnetic shown in this figure. is disposed between the shield between the motive parts of the meter two cores (l and The leakage flux of and the drag l'nechanism and of the other coil l". which does not Pass across the air parts of the meter, whereby a compact strucgaps and through the nearly closed anagture is secured. uetic circuit of core (1 passes through the Other :l'eatures of my invention will apdisk to the poles ol core C. The coils S S pear from the following specification and are oppositely wound and produce fluxes accoinpauyiundrawings, in which--- which. with the leakage flux of coil P, prol igure 1 shows a front elevation of a meter arranged in accordance with my in veution, the front. cover being removed; Fig. 2 shows a plan view of the same, the top casing: being removed; Fig. 3 shows a side elevation in cross-section: Fig. shows a back view. the back cover being removed; Fig. 5 is a diagrammatic representation of themagnetic circuits; Fig. 0 shows a modification oi the same; and Fig. 7 shows a further modification.

1n the drawings, A represents the back portion of the casing provided with lugs a for attaching the meter toits support.

A represents a second portion of the cusing which is secured to the back cover A by means of the screws 0.

A represents the front cover of the meter which is secured to the member A by the bolts I The motive part of the meter comprises the movable arn'iature I), which consists of the usual conducting disk, and the stationar magnetic circuit with its energizin 0011s. Disk D is carried by shaft d, whic quent rotation of the disk in a manner well umlerstood in the art. eircuited through the resistance ll, is n1ounted on the end oi the central member of core (l. and is traversed by the potential leakage .llux. which passes from the central member through the disk. and thereby produces the 00 degree displacement oi the potential [but thri'iugh the disk in the manner well understood in the art. By varying the resistance ll. the client of coil L may be adjusted. It will be seen -from the drawings that the series coils have a nearly closed magnetic cir- -euit. and accordingly exert a strong torque.

in the arrangement of Fig. 6 the poles on core C on each side of each of the air-gaps are extended, and a portion of the series In the arrangement of Fig. 7 the core C of Fig. 6 is duplicated, the second core C taking the place of the core C.

In order to compensate for thestarting friction, I provide the movable member E, which is suspended directly above the disk duce a shifting resultant flux and conse The coil L, short winding is placed on these extended poles.

gaps and adjustable in a direction approximately parallel to the plane of the disk.

6. In an alternating-current meter, a magnetic shield, a rotatable disk supported thereby, motive elements adapted to drive said disk supported from one side of said shield, and drag magnets supported from the other side of said shield.

'7. In, an alternating-current meter, a mag netic shield forming part of the meter casing, a rotatable disk supported thereby, motive elements adapted to drive said disk supported from one side of said shield, and drag magnets supported from the other side of said shield.

8. In a meter, a base portion, a member removably secured thereto and forming a partition of magnetic material through the meter, a rotatable conducting disk extending tbrough said partition, motive elements for driving. said disk on one side of said partition, and drag-magnets on the other side, said disk, motive elements, and draganagnets being supported by said partition and removable therewith from the base portion.

9. In a meter, a base portion, a member removably secured thereto and forming a partition of magnetic material through the meter, a rotatable conducting disk extending through said partition, motive elements for driving said disk between said parli- [i011 and the base portion, and drag-magnets and recording means in front of said partition, said disk, motive elements, drag magnets and recording means being supported by said partition and removable therewith.

10. In a meter, a lilll(-]')ftl'b casing comprising a base portion, a second portion adapted to be secured. thereto and forming a partition through the motor, and a third portion adapted to be secured to the second portion, and meter elements oporativcly as sociated, some inclosed between the first and second portions and others between the sec ond and third portions of the casing.

11. In a meter, --a three-part casing comprising a base portion, a second portion ai'la'pted to be secured theretomnd forming a partition through the meter, and a third portion ada )ted to be secured to the second portion, an meter elements operativelyassociated, all supported by said second portion, some between the first and second por-' t-ions and others between the second and third portions of the casing. 7

12, In a meter, a three-part casing comprising a base portion, a second portion adapted to be secured thereto and forming a partition of magnetic material extending through the meter, and a third portion adapted to be secured to the second portion, a conducting rotatable disk supported by the second portion and extending through the partition formed thereby, means for driving the disk, and means for retarding the disk, said driving and retarding means being supported by said second portion on opposite sides of the partition.

13. An electric meter for use on alternating-circuitscomprising in combination, a series eleetromagnet; a multipolar shuntmagnct; a coil connected as a shunt across the supply-mains and wound on a part only of said shnnt-n'iagnet whereby considerable magnetic leakage is produced from the remaining parts, together with a rotatable clcmcnt mounted between said series and said shunt magnets, substantially as described.

[4. An electric meter for use on alternating-circuits comprising in combination, a muitipolar series clcctromagnet: a multipolar shuntanagnet; a coil connected as a shunt across th supplyanains and wound on a part only of said shunt-magnet whereby coushlcrablc magnetic leakage is produced from the remaining parts, together with a rotatable element mounted between said scrios and said shunt magnets, sul'istaiitially as described. I

in witness uluxrcofll have hereunto set my hand this eighteenth day of April, 1904.

WILLIAM H. PRATT.

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