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Faculty of engineering

Alexandria University

Internal Lab

Report on one type of dynamometer 

Sherief Abdul Raouf El Hadary

I ! "#$

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 A dynamometer  or "dyno" for short, is a device for measuring force, moment of 

force (torque), or power . For example, the power produced by anengine, motor  or 

other rotating prime mover  can be calculated by simultaneously

measuring torque and rotational speed (!).

 A dynamometer can also be used to determine the torque and power required tooperate a driven machine such as a pump. #n that case,

a motoring  or driving  dynamometer is used. A dynamometer that is designed to be

driven is called an absorption or  passive dynamometer. A dynamometer that can

either drive or absorb is called a universal  or active dynamometer.

Dynamometers employed to test Engines are:

♦  Eddy Current dynamometers:

Water Cooled $ in wide %orque rating range from tiny & 'm to massive

'm. #n self cooled * +ater coolant cooled version depends on!ower rating. -peeds upto !.

/ddy current dynamometer, A simple dynamic load sys$tem for accuratetesting of all type of /lectric otors, Air otors, 0ydraulic otors,/ngines and other rotating machinery1s. #t provides the ideal solution foraccurate analysis of !ower, %orque, -peed, Fuel and 2ubricationconsumption and quic3 pass fail testing of all type of /lectric otors,/ngines, 4ears and other otating a$chineries.

/ddy current dynamometer absorbs power * measures %orque and -peedcharacteristics with a unique bra3ing system, which pro$vides frictionless %orque loading

(5 to &5) constant variable torque load, independent of shaft speed. %orque istransmitted by a magnetic field with out friction or wear. #t eliminates mechanical loadingto the prime mover, providing longer life. #n /ddy 6urrent 7ynamometers torqueincreases as the speed increases, reaching pea3 torque at rated speed. /6dynamometers have low inertia as a result of small rotor diameter and a low residualtorque of &5.

6ooling is provided by a water circulation system, which passes inside the stator todissipate heat generated by the bra3ing power. %he water cooling in the /67ynamometer provides high continu$ous power ratings * has typical accuracy

ratings of 8.5 to 8.5 full scale, depending on si9e and system configurationand a very long lifetime. ounting orientation of /ddy 6urrent 7ynamometers is inany direction, 0ori9ontal, :ertical or inclined.

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/ddy 6urrent 7ynamometer is ;i$directional,7ry$gap %ype. ;eing 7ry operation, the only re$sistance to movement of the rotor is bearingfriction and the minimal windage effect. +ith9ero excitation, an almost no$load condition isachieved over the entire speed range

• High Accuracy strain gauge load cell for  %orque measurement.

• Precise Control even at low loads and rapid changes in demands.• Bi-directional operation. 

• Low Inertia rotor . 

• Balanced otor sha!t assembly on precision  bearings ensures smoothoperation.

• -ingle excitation coil, molded in epoxy.

• High elia"ility in e#treme conditions. /lectroless nic3el plating of cooling passages

ensures corrosion !ree operation.

•$%$ ring pipe connection to minimi&e error in tor'ue cali"ration due tovariation in water  supply pressure.

(PECI)ICA*I%+(

• !ower range +atts < & =w

• %orque range & < 'm

• -peed range >? < & rmin

• 6ooling@ +ater 6oolant

• 6ooling +ater !ressure@ & B ;ar

• +ater Cutlet temperature ax DE6.

• %orque measurement accuracy .5 F-, resolution .& 'm.• -peed measurement accuracy &rmin

APPLICA*I%+(

For %orque, -peed, !ower, !erformance * /n$durance testing of@

/lectric otors, 0ydraulic otors,!neumatic otors,

#nternal 6ombustion /ngine, 7iesel /ngines,4asoline /ngines, =erosene /ngines,

%ransmission, 7ifferential 4ear ;oxes,

4ear ;oxGAutomotive * #ndustrial 4ear ;oxes,

%urbinesG4as, -team, !umps, -hafts, Axles,

Agricultural achinery ining achinery !etroleum drilling

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♦  EDD, CE+* E*ADE *ypeD,+A.%.*E %orque range 'm (.

=g) to 'm () =g %orque

range, in self cooled * fan 6ooled version,to avoid +ater cooling hassles.

/ddy 6urrent ;ra3e etarder to apply nonfric$tion bra3e to reduce -peed from full speedto lower speed in controlled fraction

/ddy 6urrent etarder ;ra3es are designed toapply non contact friction less bra3ing, for re$tarding :ehicle, machine speed from fullspeeds (upto !) to minimum speedof ! in sudden or decelerated manner.

/ddy 6urrent etarders are manufacturedfrom 'm (.=g) torque to massive 'm ( =g), in -elf 6ooled * Fan 6ooled:er$sion.

/ddy 6urrent etarder ;ra3es are used as dy$namometers to test /ngine, 6hassis, otors *other rotating devices, #n achine tools applica$tions.

/ddy 6urrent ;ra3e etarders are virtuallymaintenance Free.

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Rated Rated Rated Max   Moment Water Weight

Model   Power   Torque Speed Speed of Inertia   Flow Approx.

KW HP Nm   RPM RPM   KgM² Ltr/Hr   Kg

WED-00125 0.125   0.17   1   1200 14000 0.0004 6   28

WED-0125   1.25   1.7   8   1500 14000 0.0008   40 35

WED-022   2.2 3 15 1500 14000 0.0017   85 55

WED-038   3.8 5 24 1500 14000 0.0026 110   70

WED-06   6 8 35 1500 13000   0.055   220 100

WED-11   11 15   50 1500 13000   0.068   440 180

WED-15   15 20   70 1500 12000   0.073   600 160

WED-38   38 50   170   2000 11000   0.095   1400 240

WED-55   55 75   260   2000   9000   0.10   2000 260

WED-75   75   100   320   2000 9000   0.12   3000 270

WED-110 110   150   400   2000 9000   0.18   4200 270

WED-150 150   200   540   2000 8500   0.26   5700 350

WED-192 192   250   680   2000 8000   0.41   7000 560

WED-220 220   300   960   2000 8000   0.45   8200 600

WED-300 300  400

  1400  2000 6000

  0.95 11000  880

WED-375 375   500   1920   1800 6000   1,82 14000   1275

WED-450 450   600   2700   1800 5500   3.28 16000   1400

WED-650 650   900   4000   1800 4000   9.95 22000   2290

WED-750 750   1000   5000   1800 4000   15.86 27000   2350

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