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Nigel Patterson
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5 ,, I _ 1 SCHEDULE FOR No I "ype of Machine Poles ; Kw i Revs p min ; Volts; Amperes )esign calulated by I,lachine consructed by h operation at ( fype {eigt complete OH NoLo, Full Load I'vucomouniling COMMERCIAL TEST t No Load Volts,, Revs Current I osse-watts Load Volts Output per Kw Arm Arm Excitaminute Arm Shunt Friction Total Efficiency Copper Iron tion I Load :1 + Load Load Full Load IU Load I Test made after hours' continuous run; Armature urrent amps; Shunt Current amps: M F volts Resistance In shunt ohms leasured Resistance of Shunt \Vinding: cold ( 0(:) ohms; bt ( o C) ohms tmarks: -ate of test Test made by _ t -" THOMPSON DESION OP DYNAMO Copyrlaht '902, by SPON A CHAMBEItAIN Ul Libert)' 5 rk Av-::-from whor be obtained'

7 ameter X by core length + kilowatts fective length of core (net iron length) of at armature face Ith of tooth at armature face an length of conductor per tum ' thickness of insulation on flanges sectional area of wire mean length of one tum inside diameter area of cylindrical surface active length of segment thickness of insulation ijetween segmeuts size of contact face (sq inches) DIMENSIONS / No2 ameter ARMATURE at face MAGNET CORE length radially eriphery length parallel to shaft r pitch at armature face F'ngth beteen core heads width or diameter area of section of core minimum distance between cores ickness of core sheets BOBBIN Imber of ventilating l:lil:ts length over all dth of each duct " dial depth core body body length of winding space, excluding insulation crnal diameter core depth tmber of slots size of shunt wire pth of slot dth compound conductor, size or section of nimum width of tooth YOKE outside diameter tal number of face conductors amber of circuits thickness " -le of winding length parallel to shaft conductors in series between + andze or section of conductor (bare) I e or section of conductor insulated area of section COMMUTATOR diameter tch ofwinding (front and back), inches length of segment over all number of teeth 'angement of conductors in slot pper section + slot section (space factor) number of segments igth of active conductor per volt width of segments tal insulation between conductor and core useful depth of segment :!ripheral speed (feet per minute) ntrifugal force per pound GAP at armature face lngth at centre from iron to iron }erage length from iron to iron I \lmeter of bore of field peripheral speed, flo per min centrifugal force per pound at face COMMUTATOR BRUSHES numher of sets number in one set POLE PIECE length side by side ngth parallel to shaft 'ngth of pole arc width (peripheral) of brush in inches number of segments covered I erage pole arc + pole pitch ea of pole face total area of contact, one polarity r,- THOMPSON DESIGN OF DYNAnO, Copyrl,ht 1902, by SPON & CHAMBELAIN, 123 Liberty sr, New York, U S A, from whom copies can be obtained

9 rage I J )' No3 ELECTRICAL REACTIONS L_ II II > : :': :: ELECTRICAL It'I F per )e ARMATURE ciu;t Ull:::::::::::::: of winding! 'mber of turns per commutator segment I uling' formula 'peres per circuit of winding jpes pe' sq inch in conductor istance of commutator risers lr drop (lost volts) in armature ms brush to brush (at 60 C) 1peres per sq inch of active peripheral belt i COMMUTATOR arrangement of C R drop (lost volts) in series coil REACTIONS ARMATURE :- : ;,\'i ))) l 'I) J,') number of turns in series per bobbin mean length of one turn total resistance (at 60 C) amperes, full load amperes, per sq inch, full load ampere conductors, per pole beneath pole ; /' ::: \,/ ))) J I ); )) J J J J volts between segments between poles ersal density + pole face density per inch periph, full load :j,uency of commutation turns, gap and teeth + beneath pole peres per sq inch of brush contact density ill gap under backward horn, J load itact resistance, ohms per sq inch R drop (lost volts) due to brush contact FIELD, per pole ampere turns, no load, no load volts FI ELD COl LS " full load Ile added for armature reaction mber of turns in series per bobbin total ampere turns, full load mber of bobbins in series ampere turns shunt cil, full load an length of one tum compound coil, {unload I al resistance (at 60 C ) total lperes full load inherent regulation % 'Iperes, no load (shunt excitation) Iperes, per sq inch, full load I eostat resistance R drop in rheostat,- THOMPSON DESIGN OF DYNAMO, Copyright 1901, by SPON " CHAMBERLAIN, UJ Liberty I, New York, U S A, from whom copies can be obtained

11 -, Assuming _ inches S ---or--' CI Flux from one Mean Magnetic ,r::':--::::=-=::=t--_: :_--r_:::::t-;i:;::;:-;-ra\iinperc-tums per Material pole Sectional Area Flux Density Unit Length {mega lines} Length (from curve) i JArmature body 8 11 Teeth o lz EGap, j< - Pole Core! Yoke c iii :i :; Armature body >- c::l t< z 3 Teeth :: l III Gap :J "" ;: ] Pole Core < ::J -\ oke z 3 Q( w CQ -e :c u ol$ z o Q til Total ampere-turns needed at no-load = Ampere-turns needed _ these "ill _ _ being _,Q Assuming suitable current density amperes per square inch of copper, the appropriate "ire will be No N W G This "ire has diameter bare, or occupy c square inches of winding space on the bobbin bt The available length of winding space on the bobbin being inches the depth occupied 1: will therefore be inches Minimum circumference of winding is inches; maximum circumference is inches; Co hence mean of one tum is inches = feet Resistance of one bobbin ohms (at 60 C) Watts lost in one length e :E bobbin < z of this :> Q tl e \Veight of feet, in lbs, CALCULATION OF SHUNT BOBBIN Total ampere-turns needed at Iull-load = Add ampere-turns needed to compensate reaction = z o iii Bobbins being w Qhence probable Z eof output Probable temperature rise 75 C per watt per square inch rn :;; CALCULATION OF SERIES WINDING o :c Assuming current density amperes per square inch of copper the needful cross-section will be _ l- Eprovided by strip copper of thichness inch (= Xo S \\T G) and f ti in:' hes ',' Deduct ampere-turns at no-load _ Difference = total watts lost in all shunt coils to be 075 per cent of total output (kilowatts) machine, limits loss per bobbin to watts Taking this value weight of copper per bobbin may be found by following formula:- Pounds of copper per bobbin = ')_ (ampere-tux_meagth of on tum in fet) watts per bobbin at :::0 ex o", inches long, with inches external diameter, the cooling surface is square inches; watts per square inch _ temperature rise deg C NB-Total radiating surface of all the bobbins ought to be about 15 times the total kilowatts broad Mean length _ :total length of strip required inches = feet for one pole (If feet in total ; square inches, and may be of one turn 1'lux In armature, t lines; Flux at Co-efficient of allowan load ; at GAP CO-E NB-In calculating ampere-turns needed, p gap, is obtained by m flux density if express inch: or the number per centimetre length multiplying by o,]cj6 the in lines per square cen Ampere-turns of sh current, taken at full-load current, hence Number o pole = COMPENSATIN The number of dem per pole may Le appr reckoning the numbe region between two a multiplying this numb amperes canied by eac Ampere-turns pound winding to be ampe of Series turns per REMA

13 } TEMPERATURE TEST No5 CU!'iDITIUNS OF TEST DEGREES RISE-CENTIGRADE Arma- Armature Shunt Series Shunt Duration Yolts ture Temp Current Room Current Thr l Ther, Rell Ther, Res hours run i --- I After Commu- tator =1== Bear- ings Frame " " " " " ernarks late of Test Test made by \VEIGHTS AND COSTS Machine Parts Material Weight COST OF FINISHEI> PRODUCT Per Pound Total Per Kw Per 100 Revs 'oke 'oles Armature Core Armature Copper Commutator Shunt Coil, Series Coil Armature Spider Armature Shaft, Brush Gear, &c \ iledplate and Bearings \ TOTALS lid THOMPSON DESION OP DYNAMO, Copyright 1902, by SPON It CHAMBERLAIN, U3 Liberty 'st, New York, U,s A, from whom copies cen be obtained

18 Schedule for continuous current dyna

of coper bars of equal size, each insulated from the

of coper bars of equal size, each insulated from the manufacture is kept secret in order to keep their rivals from gaining any detrimental information; thus the public does not obtainany of the details of the construction of these world wide utilities. 'lectrical