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Патент USA US2020997

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Nov. 12, 1935.
2,020,997
H. DALLMANN
DEMAND INDICATOR
Filed March 23, 1935
Herbert 'Da?mann
135 NHis Attorne?g.
6.
2,020,997
_ . Patented Nev.\12_,__1935
UNITED; STATES2.020.997Plus-renter
nnm'nvp mmcs'ron
’ Herbert ‘mum Berlin-Karlshorst, Germany," assignor to General Electric Company, a corpo-' '
- ration of New York
Application March ‘23, 1935,‘ Serial No. 12,611
In Germany June 27, 1934
'
.12
(o1. 17-1-34) '
My invention relates to demand indicators and demand ‘for a previous time period, the length of
- to methods and apparatus for measuring and which depends upon the design of the indicator.
recording . mean values of variable, quantities,
In this respect, they ‘have .the advantage over a
a '
particularly loads on electrical systems.
5
The principal object of my invention is to pro?
vide a simple,~rugged-arrangement for indicat
ing at any instant the mean value of ‘a variable
quantity for the immediately preceding time
'
1 period.
It is an object to provide such an ar
10 rangement wherein the indication represents a
weighted mean or what may be referred to as' a
logarithmic mean in which peaks of short dura
tion receive relatively more weight than sus- ‘
.tained peaks, and receive progressively less
15 weight the longer they, are sustained. I
'
~
It is a further object of my invention to pros
videa demand indicator in which‘thermal ele-'
ments, friction drives, and resetting mechanisms .
' block interval demand indicators of not missing
peak loads which may happen to occur near'the 8
end of a time interval and thus be split between
two intervals’v of the.' blocl‘: interval indicator. ~
Furthermore, ‘since the limiting factor in the
loading of the equipment of the central ‘station
companyis the heating, which. follows a .loga- >10
rithmic law, it. is of advantage to’ employ a de
mand
Bothindicator
thermally-operating
which followsand
the mechanically
same law.
operating ‘logarithmic demand indicators are al
ready known. The principle of,the thermal watt- 15
meter is employed in the thermal type of lo'ga-'
rithmic demand indicator described by Lincoln
in .Transactions of the'American Institute of
are eliminated, in which possibility of slippage ' Electrical Engineers 1'01‘ 1915, Volume xmv, ’
pages 2279 tov 2318. Mechanically-operating de- 20
.ous operation is obtained.
~
mand indicatorsavoid discrepancies‘ from a true
20 . is overcome, and in which smooth and continu
_
i , Another object is to provide a vdemand indi
logarithmic law occurring in thermal demand
' ‘ cator of the logarithmic-law type in which dis
25
owing to certain physical limitations
crepancies from logarithmic response‘ are jelimi- ' indicators
of available material and also owing to the ifect
mnated.
‘
. _ .
.‘
of radiation in thermal indicators. Logarithmic- 25
Other and further objects and advantages will
become apparent as the description proceeds.
law mechanical demand indicatorasuchas those
disclosed .in Patent No. 1,33l,059(to Hall or in
volume 53 of Electrical Engineering for January,
In determining rates for the supply of elec
trical energy by central stations, it is frequently
1934, pages 94 to 96, consist of a watt-hour meter
30- desirable to determine a customer’s ’maximum I shaft rotating at a speed proportional ’to-instan- 3°
'demand or to obtain-a record of his demand at . taneous load, a constant-speed shaft.- a rotatable
various times,"since the investment required by member, a variable velocity-ratio friction drive
between the) constant-speed shaft and‘ the rotat
,a central station is determined by the maximum
load or demand for ‘\power rather than. by the
' . ‘average throughout the month'or year.
able member, and ' means responsive to differ‘-
In
‘
ence in speed between the watt-hour meter shaft 3‘
and the rotatable member for adjusting the fric
stantaneous peak loads indexcess of the rated
load of the apparatus‘of the central station may, tion'adrive' to bring the speeds of- the watt-meter
.7 however,‘ be borneeby the apparatus if such peaks , shaft and the rotatable membuj into conformity.
are of sumciently short duration; A rdin?ly, >
'
In accordance withi'ny invention in its pre
g ‘0 demand indicators are used whichr
nd'to the ferred form, I likewise provide a primary ele- ‘0
_'blocks of energy supplied within short intervals ment or eifect responsive to the instantaneous
. of time of the “order of ?fteen or thirty minutes value of a quantity to be‘ measured, a secondary '
rather than to the instantaneous power in kilo
element or'en'ect, and means, for bringing the'\
awatts. Demand indicators are known of ‘both, secondary ‘element or e?'ect into conformity with
45 the .block interval and the logarithmic type. .
th'eflrstatarate proportionaltothediiference“
‘meek interval demand indicators integrate ‘the
~_.load separately during each interval and. are
reset‘ at 'the end‘ of the interval, thus indicating
the arlthmeti mean during the’ interval.
between them. , ‘However, I utilise mechanical
‘connections providing a positive‘ drive in, order
to prevent slippage.v In carrying out my‘ inven- _‘
tion in its. preferred form, induction motor ele
Logarithmic .demandhindicators arein effect - ments are employed as the primary and sec-‘5°
. wattmeters with a considerable time lag 'an'dthey' ondary elements and an, electrical gr magnetic ,
‘integratewith respect to time'the difference be- '
, tween
and the
5‘, provide at anyattained
instant an
by indicatlony'of
the'indicator.
-
v -
A
.2
ems" ‘
I
io'rmity.
suitable characteristics,
mum or'maybeotherwisemechanically .
as
speedortorquemay'iormthebasisoicompari
.son otthe actionotthetwo elements.
.H
Y.
.
>_
.
p
, Amy suitable arrangement may be, employedv
'
The ieatures of my invention which are be-. ior adiustinsthe torque of the secondary unit ll.
a lieved to be novel and patentable will be pointed‘ Fbresample,theadjustmentmaybemadeby 5
‘out in the claims appended hereto._ A better‘ ‘warms thervoltage orcurrent in the winding 2:.
\mderstanding of my invention may-be obtained B! W oi! illustration. I have shown‘ the circuit‘
by‘ referring to the following description taken in controller 2. taking ‘the form of a resistance
potentiometer with a mo'vable contact II‘ serving
connection with the accompanylns drawing in ‘to
vary-the voltage appliedto the winding 2! 16
which
Fig,
1
represents
a
diilerential
torque
type
10
‘demand indicator constructed in accordance according to-the position of the contact 25.‘ The
' with my invention; Fig. 2 represents a' diilerent movable contact I‘ is mechanically connected to
the shaft 2| carryingthe rotatable disc It in such
speed type demandindicator constructed in ac
manner that rotation‘oi the disc It moves the
cordance with my invention: and risks reprei a
contact ii in the.
required to equalize 15'
15
cents‘ in part ‘a modi?cation-oi’ the arrangement
the torques! Speed reduction gearing I‘ is in
terposed between shaft 24 and themovable con
oiFlg.2.
For the sake
'
oif- illustration.
.
j I have"
.
shown in
tact 2' in order to‘cause the torqueadjustment
thedrawingandshalldescribethemanneroi
maximum load demand of an electrical distribu~
tion circuit._ It will be imderstood, however, that
,
to take place gradually and to represent the Q,
applying ‘my-invention to the measurement of
mean value or the loadmeasuredbythe unit ll 20
‘overaprecedingtimeinterval-
theprinciple ofmyinventionmaybeappliedto
the indication of meanrvalues oi ,any‘variable
quantity susceptible tobeing compared with an
adjustable comparison quantity and is .not
_
\
'lithesource llhasasubstantiallyconstant
voltage orthearransementis such thatthe oper
ation'ot the unit I4 .is indepe'ndcnt'oi' voltage
?uetuations,'the ‘position or the contact as wm g; '
representtheloaddemand.
Howevenit desired, ‘a ;
limited to the measurement of quantities in elec
acurrentr
device I'lmaybeconnected
trical distribution circuits; Nor is its-use in elec-V inserieswiththewinding?toserveasanindi
trlcal distribution circuits limited to the meas
the adjustment of the unit it and,
urement oi real-power demand as it obviously 'cation‘oi
'th’ereiorqof
the load demand. The current-‘re- so =
includes also the measurement iii-apparent nspon'sive device
TI’ may take the iorm,~ior ex-' ‘
power demand and reactive-component-ct-power ample, 01’ an indicating
or. a curve-drawing sin
IidnariredJtmaybeprovidedwithbothv
Beierringnowmoreindetailtothedrawing'in
demand
‘
g
,
-
.
-
'
a‘n indicating pointer 20 and‘a maximum pointer; '
which like reference characters are utilised to
‘designate like parts throughput, in the arranger- '
ment illustratedin Fig. l, the apparatus is shown connected toan electric system ll supplying a:
'?iem'aximllmpointerllisarrangedtobess'
load l2. :Ih'e apparatus includes; load-respon
sive primary torque-producing unit llandl'act- ' The principle of operation of the apparatus is 40
ing in opposition thereto; an adjustable ‘strength '
from‘tbe roregolns description or its .
‘1 secondary torque-producing'unit II with means ' apparent
The torque. of the load-responsive '
tor continually adjusting the strength ot'the unit ; ements.‘
I! will
with variations in the momen
It to correspond to that of the load-responsive
unit II.
'
'I'he'load-responsive unit ‘it may com- .
theadjustable torque'unit II and 45
prise a mechanism‘similar to an induction watt!
'hour' meter mechanism having a schematically
represented laminated ii'eld core ii and a‘ rotat
able disc ii cooperating with the held‘. The field
the indication of the instrument} 21 will depend
upon the setting to! - the circuit controller 2.,
which tends to 10110 v variations in the torque-of
the unit it, bututllyie ?nal adjustment cannot take
core ii carries a potential winding "connected
acrossthesouree [Landacurrentwinding ll
connectedin series with the load l2.
.
' place
. .
To energize and control the adjustable torque
producing unity", there are provided an‘ auxil
in’! source of current I! and‘ a circuit controller‘
otthepowerdrawn hy-theload-II,
- ‘The rate at which the movable contact 15 is 5“
movedds
coal to the difference in the
EE 5
58 9. E i
tom, takes place less and les rapidly'as the ae-_
'tiom'otthetwotomue-producingunitsapproachwv
,
on and theoreticallyfan in?nite-period
20 through which the current from source I! is
sunnliedto the windings oi‘the‘mit ll. The .
- unit'll-may also'comprlse a mechanism of the
induction'watt-hour meter type with a'laminated
required for complete equall
what is called the “logo
?eld core'll, represented schematicallmlnd with >
potential and current windings §2 and II, respec-‘V 'quirediorthetorqueof the'seeondary unitrto
a’ predetermined ‘fraction, such as ‘nine:
prefer to'mount a‘shading coil 22! on oneof-the .tentin of the torque or the primary unit, .when
polepieces voi! the'core 2i and energizethe unit
primary is sustained at a constant
onlythroughoneoiitswindingsllwhichmaybe the
since W
the rate of adjustment of theses-"5
tively. ' ~However, for the‘ sake of simplicity, I_
- either a current orpotential winding,'dependim é is greatest when the deviation between
uponthevoltageotthe‘souroe Il’andthet'ype ot _its torque setting and the torque oi the primary.
unit is greatest, load peaks 01f short‘ duration'will
includes aninduction disc cooperating with the havemoree?ectonthe apparatusthanloads
?eld core ii.’ In thearrangement illustrated inf
70
disc I‘ is common to field cores II ,
' circuit controller "employed, The unit It also
and 2i__-ifor;the sakeofcompactness but. ii.’ it is
desiredto eliminate any possibilityloi interaction . '
I! and ii, separate discs mav ‘
75
beemployedwhichmaybemountedon acorn-l
\
a
. 2,090,097
ing units or motors for producing torques repre a the purpose'of explaining its principle and show
senting the momentary value and the periodic ing its application, but it will be obvious to'those
_
>. mean value, respectively, of a measured quan
skilled in the art that many modi?cations and ,
tity and arranged to have the torque of one unit variations are possible'and’ I aim,"therefore, to
I brought into conformity with that of the other. cover'all such modifications and varia‘ions as I,
However, it will be understood that my invention fall within the scope of my invention ‘which is
is not limited to-this' precise construction but in-‘V ide?nedin the appended claims.»
eludes any arrangement for c
or bring
‘
What I claim as new and desire‘ tov secure b
, Letters Patent of the United States; is‘:—
dng into conformity the action-or the outputs of
I two unitsresponding respectively to the'momen
tary value and the logarithmic mean value of a
1. A demand indicator comprising in combi- 10
nation, an‘ integrating electric motor, a. rotating
measured quantity. For esample,_in the arrange shaft. driven thereby, a" second rotating shaft, 0. '
ment of Fig.v 2
I employ torque-producing motor driving said second shaft, means for sup
units or motors II and i4 corresponding to those plying current to said motor, means responsive
ll of Fig. 1, but_I so arrange the apparatus that to the difference in speeds ,of said shafts; and is
. .-the speeds rather than_the torques are brought’ _ means controlled thereby for varying the cur
“ into conformity. ‘The secondary adjustable
rent supplied to said motor in such a direction as
torque-producing unit II is provided with an in- _ to equalize-the speeds of'said shafts.‘
dependent rotatable disc ll, in the arrangement
2t A demand indicator comprising in combina
Q0 'of Fig. 2 and a differential "is provided for com- ' tion, a» mechanism for producing a torque pro- so
paring the speeds of thediscs l8 and ‘II. The portional to the momentary value of vthe quan
differential ll comprises sun gears}! and Il me
tity thedemand for which is to be indicated, a
‘ chanically connected to the discs‘ I! and SI, re-: countertorque-produ'cing mechanism, said torque
spectively, andplanet gears" carried by a plane
producing mechanisms having a common rotat
_2_5
tary’housln’g as.
;
-
_
'able ' member,
" -
said
countertorque-producing 2i!
The planetary housing 35 carries the movable mechanism havingian energizing current-con
contact 2,! of the resistance potentiometermlil and ducting winding,‘and means for supplying an ad- also carries a pointer 38 cooperating with a scale justable current thereto having a movable ad
1 31; It will be apparent that, if the adjustment justing memberm'echanlcall'y so connected to said
80 of the potentiometer II is such that the torque
rotatable member as to_ be moved thereby in a 8,0 I
producing units l3 and I l rotate theplanet gears, direction required to balance the torques of said
-' 32 and l! at different speeds, the housing 35 will torque-producing mechanisms. ‘
'
°
be rotated in one direction or another, causing the
3. A demand indicator comprising in combina
,
movable contact 2! tb slide along the potentiome
as ‘ter an and bring‘ the speeds of the units In and
ll into conformity. The discs ll’and 3|! need
‘tion, a mechanism for producing a torque pro-.
_
portional to the momentary value of a quantity, :5
4 the demand for which is to be indicated, a coun- ,_
- not necessarily, rotate at the same speed ‘when 1
the housing “is stationary, since different‘ gear
ratios maybe employed between thediscs and
tertorque-producing mechanism, said ‘torque
producing mechanisms ‘having a common r0 t
able
member,
'said- -~ countertorque-producing ._
“
do the corresponding sun gears ‘of the din'erential mechanism having an energizing icurrent-con- 4f)
ii. If the voltage of the source ills substane , ducting winding, Tmeans for supplying an ad
' tially’constant, the speed of the disc I. will de
iustablecurrent thereto having a movable ad- _
pend on ',the position attained by the-movable - lusting member, ‘a
reduction gearing me
contact “and the demand may, therefore, 'be . chanically connecting_ said movable. adjusting
\45 read from the scale 31; "If the voltage of the
source. is tends to vary, demand readings are
preferably obtained'from the ammeter I]. ‘
'
A modi?ed arrangement for causing the ad- I
jus'table torque unit in‘ to adjust its action in
member and said rotatable member and arranged 45
totmove said adjusting member in a direction re-'"
quired to balance the torques in, said ‘torque
producing mechanisms:
0' 4.-A demand indicaton; comprising in’ combi
60 conformity to’ the speed of ‘the load-responsive ;: nation, a pair of, torque-producing mechanisms 50.,
‘unit is is illustrated in Fig. 3. In this arrange-' - acting in opposition‘, one of said mechanisms have '
. ,ment, no mechanical differential is employed but . 'ing a torque proportional to thermomentary value
- the"resistance potentiometer II .is arranged ‘in
of theequantity the, demand for which is to be‘
“annular form‘ and is axially mounted ‘upon a.v , indicated and theother ‘or saidmechanisms hav
55 shaft II mechanicallyconnected through the re
ing an adjustable torque, a member acted upon 55 - _,
, duction gearing Itto the shaft 24 of the’ load-re-V _ jointly‘ by said torque-producing- mechanisms
-
sponsive unit it, The ‘potentiometer II-is pro-v and movable in response to unbalance in their ac
vided with a movable contact 25' which is earl, tionsl' and‘ movable means for adjusting the
' . ried by a shaft 3! mechanically connected through
to suitable_ gearing“ to it shaft‘ 4| carrying the
-
torque of saidlatter ‘torque-producing“ mecha- .
> him, ‘so connected to. said‘ movable member as to
It will __ to be moved-thereby in a direction required to
'
disc “30 of the adjustable torque unit II.
\ be apparent that, until the shaft 4| has reached
balance‘ the action of said torque-producing -
a speed corresponding to but not necessarily
equaling the
of the shaft “,relative rho- '
5. A demand indicator comprising in combina- - I
65 tion-will take place betweenthe annular poten tion a pair of torque-producing mechanisms act- 65
tiometer ‘II and the movable ‘contact 25', 'bring- -' ing in conjunction, one 0L said mechanisms hav- ,
_, ing'abouttla change in the speed of-the shaft ll ‘ing’_ an output proportional_ to the momentary
of- the'adiustable torque unit II. The logarithmic value of a quantity, the demand vfor whichgis to
mean value of the load tobe measured may, there ,be indicated, and theother of such mechanisms
'
to fore, be determined by means of a suitabl'y' cali- - having an adjustable output‘, an {adjustable de- ‘I0v
‘bi-ates instrument :1. as in the embodiments of ‘vice acted upon jointly ‘by said-torque-producing
my, invention shown in Figs. 1 and 2.
‘ mechanisms’ arranged to‘ have its adjustment va—v ‘
I have herein shown and particularlydeseribed ried when ‘said m
not thereon unequal-~
certain‘ts ofimy inventiomand cer.—_ ly,‘said,devic'e being so connected to said adjust-
7'5
of operation embraced therein for able torque-producing
c
'
\
.
astoyary; 15/? m
> am“?
the output thereof in the
to momentary value of the quantity the demand for
equalize the action. of said torque-producing. which is' tov be indicated, an adjustable speed
‘4E
.
_
_
v
_
7
motor, movable means for controlling the speed
of said adjustable speedtmotor, a. differential
, tion, a pair of torque-producing mechanisms act- 1" mechanism having rotatable elements mechanig’ 5
cally connected to said motors. and an element
ing in conjunction, one of said mechanisms hav
ing an output, proportional to the momentary‘ movable in response to the di?erence in speeds of
- value ‘of a quantity, the demand for whichis to be said rotating elements, said movable element be
indicated, and the other of said torque-produc ' ing so connected to the speed controller 01' said
adjustable speed motor as to equalize the speeds 10
ing mechanisms having an energizing current
lot-conducting winding, a circuit controller acted of the rotating elements of said diiierential mech- ,
upon '‘ jointly by said torqueeproducing mecha
anism.
T
_
.
10. A demand'indicator comprising in combi
a source of current connected to the ener
winding of said‘ latter torque-producing nation, a motor having a speed‘ proportionalto
the momentary value. of the quantity the de- 16,
'mechanism and controlled-by’said circuit con
troller, said circuit controller being arranged‘ to‘ ' mand for whichris to be indicated, an adjustable
‘ ‘mechanisms.
8. A demand indicator comprising
be so acted upon by the ‘joint action of said \speedlmotor, {source of current energizing said
vtorque-producing mechanisms as to vary the cur _ adjustable speed motor, and a'circuit controller -
rent in said energizing winding in the'jdirection ' interposed between said current source and ‘said
'_required to equalize the action of said torque~ motor to vary the speed thereof,-said circuit con- 26“
producing mechanisms.
‘
o
v 'troller having a ‘pair'of relatively movable ele
H 7.- A demand indicator comprising in combi; ments to vary theadjustment thereof, one'of'said '
nation, a pair of torque-producing‘mechanisms elements being mechanically connected to one
acting in conjunction, one of said mechanisms ‘of said motors and the other being connected to
having an output proportional, to the momen ' ‘the other of said motors, the arrangement being 25
t-ary value of 'a quantity, the demand for which such that differences between absolute 8908118 of ‘
the elements of said circuit controller vary the
is to be indicated, and the other of said mecha
nisms having anenergizing current~conducti?g
winding: means for supplying an adjustable cur
*rent to said winding acted upon jointly by said
adjustment thereof to bring the speed of the ad
iustable speed motor into‘ conformity with that
of the'other motor.
l‘
'
' 36
11. A demand indicator comprising in com-‘
torque-producing mechanisms. the arrangement
being such that the current magnitude is varied ' bination, a'unit ac'ting'with a force proportional ‘
in response to unequal action of said torque-pro; _' to-the momentary value of the quantity the de- -
ducing mechanisms in a direction required to
35 :equalize said action, and a current-responsive
device connected in series with said winding and
said‘ adjustable current source.‘
_
-
V
'
8. A demand indicator comprising in‘combina
' unction', one
-tion, .a pair of motors acting in
'of'said‘ m'otors having a speed p
mand for which is to be indicated, a second unit '
acting with a force proportional to the'logarith- '35 _
mic mean during the preceding time of the
- .force of said ?rst unit; and means producing an
indication- varying as the force of said second
.unit
momentary value of the quantity the demand for '
which is to'be indicated, the other of said-motors
having an adjustable speed. shafts driven by said
motors,- means responsive to the difference in
varies.
a
1
_
-
_
I
12. A device for indicating the ligarithmic 40 '
rtional to-the ._
means for the preceding time. of the action of a _
movable member ‘comprising in combination with
said movable member, a second movable member,
vmeans forbringing the action of ‘said second
-' member into‘ conformity with that of the ?rst<45
‘by for varying the speed ‘of the adjustable speed ~ member at a rate continuously proportional to
motor in such a direction as to equalize the speeds the. diil'erence in their action, and means‘ re
_ 43. ‘speeds of said- shafts, and means controlled
of said shafts.
-
Y
'
_
sponsive tothe action of saidsecond‘member.
.
9. A demand meter comprising in combination.
a motor rotating at a speed
7W1 mm
the
1
_v
V
,
A
-_ liatentjidated November-12,
1935.’ > Disclaimer-fined mil-‘4317,1937, by the
liniKarlshorst,
;.
asslgn‘ee,
é’ompi‘z'hyfj}. ~ .
- Hersh sigma thisdisclainier welaimsi
»
-"
> am“?
the output thereof in the
to momentary value of the quantity the demand for
equalize the action. of said inrque-producing. which is' tov be indicated, an adjustable speed
‘4E
.
_
_
v
_
7
‘ ‘mechanisms.
8. A demand indicator comprising
, tion, a pair of torque-producing m
act- : ~
ing in conjunction, one of said mec
hav
ing an output, proportional to the momentary‘
motor, movable means for controlling the speed
of said adjustable speedtmotor, a. differential
mechanism having rotatable elements mechanig’ 5
sally connected to said motors. and an element
movable in response to the di?erence in speeds of
- value ‘of a quantity, the demand for whichis to be
said rotating elements, said movable element be
indicated, and the other of said torque-produc
ing mechanisms having an energizing current
' ing so connected to the speed controller of said
adjustable speed motor as to equalize the speeds 10
lot-conducting winding, a circuit controller acted of the rotating elements of said diiierential mech- ,
upon '‘ jointly by said torqueeproducing mecha
anism.
T
_
.
10. A demand'indicator comprising in combi
winding of said, latter torque-producing nation, a. motor having a speed‘ proportionalto
the momentary value. of the quantity the de- 16,
'mechanism and controlled-by’said circuit con
troller, said circuit controller being arranged‘ to‘ ' mand for whichis to be indicated, an adjustable
a source of current connected to the ener
be so acted upon by the ‘joint action of said \speedlmotor, {source of current energizing said
vMarque-producing mechanisms as to vary the cur _ adjustable speed motor, and a'circuit controller -
rent in said energizing winding in the'jdirection ' interposed between said current source and ‘said
'_required to equalize the action of said torque~ motor to vary the speed thereof,-said circuit con- 26“
producing mechanisms.
‘
o
v stroller having a ‘pair'of relatively movable ele
H 7.- A demand indicator comprising in combi; ments to vary theadjustment thereof, one'of'said '
elements being mechanically connected to one
nation, a. pair of torque-producing‘
‘of said motors and the other being connected to
acting in conjunction, one of said m
ent being 25
having an output proportional, to the momen ' ‘the other of said motors, the
t-ary value of 'a quantity, the demand for which such that differences between absolute 8908118 of ‘
the elements of said circuit controller vary the
is to be indicated, and the other of said mecha
nisms having anenergizing current~conducti?g
winding: means for supplying an adjustable cur
*rent to said winding acted upon jointly by said
adjustment thereof to bring the speed of the ad
iustable speed motor into‘ conformity with that
of the'other motor.
‘a
'
' 36
11. A demand indicator comprising in com-‘
torque-producing mechanisms. the arrangement
being such that the current magnitude is varied ' bination, a'unit acting'with a force proportional ‘
in response to unequal action of said torque-pro; _' to-the momentary value of the quantity the de- -
ducing mechanisms in a direction required to
35 :equalize said action, and a current-responsive
device connected in series with said winding and
said‘ adjustable current source.‘
_
-
V
'
8. A demand indicator comprising in‘combina
' unction', one
tion, .a pair of motors acting in
'of'said‘ m'otors having a speed p
mand for which is to be indicated, a second unit '
acting with a force proportional to the'logarith- '35 _
mic mean during the preceding time of the
- .force of said ?rst unit, and means producing an
indication- varying as the force of said second
.unit
momentary value of the quantity the demand for '
which is to'be indicated, the other of said-motors
having an adjustable speed. shafts driven by said
motors,- means responsive to the difference in
varies.
a
1
_
-
_
I
12. A device for indicating the ligarithmic 40 '
rtional to-the ._
means for the preceding time. oi’ the action of a _
movable member ‘comprising in combination with
said movable member, a second movable member,
vmeans forbringing the action of ‘said second
-' member into‘ conformity with that of the ?rst<45
‘by for varying the speed ‘of the adjustable speed ~ member at a rate continuously proportional to
motor in such a direction as to equalize the speeds the. diil'erence in their action, and means‘ re
_ 43. ‘speeds of said- shafts, and means controlled
of said shafts.
-
Y
'
_
sponsive tothe action of saidsecond‘member.
.
9. A demand meter comprising in combination.
a motor rotating at a speed
the
1
_v
V
,
a
-_ liatentjidated November-12,
1935.’ > Disclaimer-fined March‘3iti937, by the
liniKarlshorst,
;.
asslgn‘ee,
é’ompi‘z'hyfj}. ~ .
- Hersh enters thisdisclainier torc'laim'sii
a
,
GWWAW‘W, 1987-] J i 1‘
»
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