US1060894A - Dynamometer-wattmeter. - Google Patents

Description

DOLIVO-DOBROWOLSKY. v DYNAMOMETER WATTMETER.

APPLICATION IILED AUG.18, 1910 Patented May 6, 1913.

Inventor:

michael no'livo-nohr'owolsky Hisflctorne g.

wltnessesz .IICHAEL DOLIVO-DOBROWOLSKY, 0F WILMERSIDORF, GERMANY, AS$IGNOE TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

DYNAMOMETER-WATTMETER.

Application filed August 18, 1910. Serial No. 577,862.

Specification of Letters Patent.

Patented May c, 19113.

To all 20/20 122. it may concern lie it known that I, Micnnnr. Domvo-Donnowocsn'r, a citizen of the Swissltepubhc,

residing at \Vihnersdort, Germany.v have 111;

vented certain new and useful Improvements in Dynanu:mctcr vattmete rs', of which the following is a specification.

My invention relates to dynamometer wattmct crs and has for its object an im provcmcnt in the construction of instruments of this character.

More specifically, the object of my invention is the construction of an electro dynamometer wattliicter which shall be compact and simple,havc the greatest possible torque, with the use. of as few ,ampere turns as possible, and shallbe adapted for circuits of varying capacities.

For a further miderstanding of my l1lvention. reference may be had to the accompanying drawing, wherc Figure I shows a vertical view, partially in section, of ameter constructed in accord- -ance with my invention; Fig. 2 shows a top 25 yiewof a portion of the same, certain details being omitted; Fig". 3 shows the connections which I employ; and 4 shows a vertical view of a portion ot' the meter.

Referring first to Fig. 1, the meter may be fastened to a suitable base 1. 2 and 3 are magnetic cores, thc outer of which is formed as a hollow cylinder and the inner as a solid cylinder, these cores being concentric and spaced apart so as to have an air gap t between them. These cores I prefer to construct 0t a laminated silicon alloy, iron or steel. l prcl'cr to use a silicon alloy of iron or steel r any other suitable material having a high electric resistance so as to decrease the iron losses in the core, for, as is well known. the iron losses in a magnetic core produce a phase displacement between lhc tlux in the core-and the current flowing in the coil energizing the same and, it such losses are large, this phase displacement will be comparatively large. By dccruising the proportion of these losses, the phase displacement may also be decreased and thus the :urcuracy of the instrument increased. They may be fastened together in any suitable manner. Passing between the cores and so through the air gap and revolving in the same is the voltage COll 5. which may be attached to shafts 6, 6 held in suitwith a suitable pointer and scale in the usual manner, and as these devices form no. portion of my invention, I have not illus? trated them. movable voltage coil is the stationary cm;-

In inductive. relation with the;

rent-coil T which I prefer to construct so that it shall be short eircuited and consist ofa single turn composed of vertical bars joined at their ends by conductors 8 and 9. Con-- ductor -9 may be inserted 'in the base and shown in the drawing. The stationary current coil may be insulated from the cores by insulation 10 and the cross piece 8 may have surrounding it insulation 10'. Surroundin cross piece 8, or a portion of the current coi, is the magnetic core 11, having wound about. it athird coil 12 which is in inductive relai-i tion to it and the stationary coil and hence forms the primary of a transformer, of which the stationary current coil forms the secondary winding. This may be better seen by referring to Fig. 4,,which shows a view at right angles to that shown in Fig.1 of member 8 and coil 12 with insulation 10'.

Beferringnow to Fig. 3, which shows the connections I employ, 14 and 15 are conduc? -16, whose energy consumption it is desired to measure. The ,voltage' coil 5 may be con,- nected directly across the. mains as shown, or in series with a resistance in the well known manner which I have not illustrated, and the third coil or the primary of the currenttransformer, of which-the stationary current coil forms the secondary is connected in series withone of the conductors of the circuit, as shown.

In case it'b' desired to measure circuits of varying capacities, cross piece 8 may be; removed and the core and coils surrounding this cross piece replaced by a suitablecore and coil having a difi'erent number of turnii so that the ratio of transformation between the secondary and the primary of thistransformer device may bechanged and the current flowing in the stationary short-circuited secondary coil -for'circuits of widely varying capacity will be of a substantially uniform magnitude. Such substitution will be well understood by those skilled in the able bearings. "lhis coil may be provided art.

While I have described a pret'crrml e1nbodiment of my invention, i do not limit myself to this embodiment but cool: in the appended claims to cover all embodiments which will be obvious to those -1lillc-l in the art and will not depart lroin the spirit of my invention.

Nhat .1 claim an new and desire to secure by Letters; Patent of t :e l lllltll Slates. is:--

1. An elecli-o (lynamonieter \vallmetcr comprising in combination a movable voltage coil, a stationary short circuitcd cur rent coil in inductive relation therwvith. a magnetic core surrounding a portion ot' the current coil, a third coil, in inductive relation with the core and the current coih and means permitting the removal of the core and the third coil from the current coil.

2. An electro dyna'uiometer comprising in combination two concentric cores of magnetic material spaced apart, a movable coil passing between the cores, a stationary short circuileil coil in inductive relation to the movable coil and the cores, and a third coil in inductive relation to the short circuitecl coil.

3; An electro dynamometer Wattmeter comprising in combination two concentric cores of magnetic material spaced voltage coil movable between the cores, a stationary current coil comprising a single short circuited turn in inductive relation to the cores and the voltage coil, a magnetic. core mil-rounding a portion of the current coil in inductive relation thereto, and a third coil in inductive relation with said core and the current coil.

4-. An, electro dynainon'ieter wattmeter comprising in combination two concentric cores composed of magnetic material of" high electric resistance spaced apart, a voltage coil movable between the cores, a stationary current coil comprising a single PhOIt cira'parl', a

cuited turn in inductive relation to the cores i and the voltage coil, a core surrounding a portion of the current coil, :1 third coil surrounding said core in inductive relation to it and the current coil and means permitting the removal of said core and coil from the current coil.

In witness whereof, I have hereunto set my hand this 6th August, 1910.

MICHAEL DOLIVO-DOBROWOLSKY.

Witnesses:

LEMP RIoHAnn, JULIUS RUMLAND.

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