117
846

THS

 

 

ee ther Be wo 5 4a aoa
ora?) 3 ato. Bone) 5 deh
See A eked 6 bio fe ia
ei Le ey Cee a

Thesis fer the Degres of B. S.
ey
AA al as
1912
Cor

A SO: TARTSON OF BRAKE EFFPIOUSNGY OF TRDUGTION POTGrS

THE REFIGT™ CY AS GALCULATED FRO THA OTAGTN PTARRAM,

4

BY

AeBe MEAD. JeVeo HINSART.

VIOUTAAN STATS GOLUNGH.
THESIS

this thesis was loaned by

wre Ae Be ..9ad

under tne date indicated by the cen .rtment stamp,
to revlace the orisinal which was destroyed in tne fire
of ilarcn 5, 14916.

 

 
OBJECT.

The ohject of this thesis is to 2o-.nare the
aftiztancies of various sizes of induction motors as

aalsulatei fro. their effictencies as deterniinad by

yrony ani rone brakes.

Artuanil loidt tasts on induction motors, as wall

a3 on any other tyre of aslattriaal machinerv, are avoided

wherarer nossihble hv the averasve user, sinre they ine

a

VOolva 4 considerable exvanitture of sneruy and snecial

anritannres, if acwuratae results are require.

“athedis have heen dewelcpei therefore, for nre-

deteraining the rerfernanese of a machine under actual

nad conditionse Such a method in anrliieation to in-
quttion motors is Knorn as the 21irole diacsranr In the
eonstruttion of the atrale diacman thea data neressarv

for ynrefetensinines the nerforianee curves of an indhere

tion motor ars;
Anineres and watt invut with .otor minning idle.

le
De " " a u ¥ amiature lowked.
Ze Restastanes ctf ths stator wirmiincve

tis:

Tn Lavine out the folloving dilagvra,
 

 

 

 

OR the

Y of
. ~

ayuils tee Lmresse. voltaic,
watilass miryvant, OD no Icend aurrent ner nhaisea, OC the

nar whase ~inl DG. tha effective

BHort aetrautt current
» fFfartar oF tha motor sity

g.

Ih

ayresnt ner nkasee Tha no rar
Qi t hues Loewe 1 en rey Gas
~J4

Tamit to inotor

Foran faato: bo notes = Gos ¢g a UE
79
xX AX wx rl +r, x OF x rl

'¢
ta
24

4 - « .
pbatoe 6 2on ar losses

Tniyut to rotor = % x AK X nl - “4 * One “

tl
|

Rotor ror er Icsses
wo
a ° a —— 7° ~ ye =. QO
Motor machantenl outpit= p (CH x AR = Py x OG Pox pa )
ow

naeranjgjedl outrut

-_— — a ow mt

Votor effirianca Sl
™ 17 “4
aJ x é y x v A

Dp
Y « OR?

y
yx (Bx AK x pl =p x OH = pl
— G @ Li TA ow ae Oe ee oe =m = ___._..___1

f

_

 

Foe eiivetent rotor res
YN = NOe nNRXIrs Of Noles.

fF x Fram yaney ¢

 
In each test the fsenerstor field was excitet

from the 125 volt Edison storave hattery. While running

these tests the voltace was kent constant by an adjustable

rheostat in series with the generator fieli, and the sneed

of the generator was also kent sonstant so as to obtain a

eonstant frequaenry of 60 seles. The resistance of each

atbator Nhase Was measurel while motor was still warn

In all the tests the meenaniernl outrut was

measure, with a brake aii the electrieal innut bv meters,

for yarious loads from gero to about one and one half

Tnstantaneous raatinges were taken in

rated full loa.
aach egase when se7nle berans balanced. All weters were

ealibrated after the tests were made and tre readings core

rected.

BRAKESe

The brake used in tests “1 and +2 was of the

rons tyne shown in FPige le Care was taken to have the

points of sunvort of the rove in the sae vertical plane,

taneant to the surface of the pullev, s0 that the real

forse ana not a 2onnonent was measured. The brake ani

was teken as the distance in feet between the canter of
the shaft and the center of the rone, wnich in this case
W289 «PAT fact.

The brake arm used in test 23 was of the prony

an Fo

 
tvys, and as shov-n in Fiz. 2, the line AB in feet which
is equal to brake am was kent horizontal ani the suprort

on the ssale vertienl, thus doings avavy with all co.mcnent

forses. The lsnzth of the brake ami on this brake is 1.-fA ft.

The nNullevs in all three tests vere o° the water
eooling tyne, Fitted to the shafts bv means of bushin’se

he Brake Horse Powar fru all these tests were firured fron

J

he formula 38.H.P = 2i'L NW
32,000

wheres L = thea lencth of tha prake am

ct

the muaiher of revolutions per minute and

tt

N

the net weisnt on sealee

It

W
Thea R,P.Mewere neasured by a tachoieter prick

Wis enerke] hbetore eatn test by a sneel cointer.

RERERENGES
The follioving authoritiss were referred to:
Shelton ®% s4BONy De £51 — 238.

rarpinatotr, VOle Be NY ¢ 166 ~ 1746

Steimietz — Alternating Current Phenomena.
Te 306 — 31096

Aneariaan Corresssondenee Sthoole VYOle Aco
Ye HBO — 3GAe

MaAllister's Alternating Motorse ppne 65 ~— 70.

Dynanocreters & Measurements of Forer, by
WIUAtnerse

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 
 

aE

arog

 

 

 

. '

UJ

On
- i)

 

 

 
CONCLUSION.

In each case sare was taken to keen the pulley
in the midile of the rons hrake frais, for if it is above or
below the midils, the error is increased when the line join-

ing the sunvorts of the rove is not tanzent to surface of

As shorm in the efficienw curves for test rl;
tns brake is not to be denended urncn for reatinys of light
loais. Best results wara ohntainel Prom the pronv brake
as arg shovm bv the afticienw curves in test 3%, 413 brake
being more sansitivese ani a mors accurate balanes obtilnete
Tt was found tr»at dus to vibration, stif*ness
of tha rone, hirth steal of motor ani adifrimilty of kKeening
ths noints of sumnort of rona in sus riane tangent to
Nullav, that this method of testing a inotor is not as de-

sirable as a test with etraie dinerrre
TUST 71.
The motor usei in this test was of the following
Aasorivtion:— 2 H.P., 220 volts, A poles, 2 phase, 60
ey216, 1800 R.P.Me, Saneral Hlactric induction motor,
ynaving a wound rotor with full load surrent of 5 anneres.
Ths fastory nunher is 71406, Tyne 10, Class 4-2-1800, Forn Ke
THA manhanisal outyut was measured by a rone
braka shown in Five ly, anid the mirrsent was taken from a
125 volt Rotary Gonverter with ths volta stenned um to 220

by ingans of gnto transforiearse
 

 

 

 

 

 

ceO0 VOLT INDUCTION MOTOR
ene als esl 0 eens

STRAY, POWER READINGS

AMPS | WATTS] VOLTS! SPEED
ee 8.2 | 220} 1800 |RUNNING LIGHT
6. TS|C08.2 oh -3 Mieeneetll Lai) ek el a ae

BRAKE TEST READINGS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AMPS | WATTS| VOLTS} SPEED! LOAD | H.P | EFF
2.50 mG one om ACR? 0.0
Mee) i S70) ae Cy 7: ) eee
I23| 475| + I782| (4 AS ahr s
584) 608} «= [1760] 18° | 1.49[ 91.4
meee GE Fd chen ieee) a ae
SE: ee a ee a
960} 965 waa OS at 8 SD A Se 8
2 Ee oo) ee a a 9

 

 

 

ROTOR RESISTANCE =208 oHmMS
EQUIALENT STATOR RESISTANCE =224 0HMS

COMPUTATIONS FROM CIRCLE DIAGRAM

 

 

 

 

POWER | WATTS aaa 7aau
von r1)=) Koln a1") 1 enieRaicedl duioet inal YS LS

aga 4 ee = dO: 0) ye) | ee 2;
a) Mee ee 4 ee ae ee eee te
64.5| 782] 93.0] 1.05} 507] 6.26) 224] 49.5
81.5/1508] 89.7| 202! 9761235) 452] 975
82.0) 15942! 89.4) 207/100.0/12.65) 4.65] 1000
85,0/2374| 83.0] 318/1535/18.55| 8.46) 146.7
74912684] 79.8] 3.60) 174,0/23.401/0.40! 185.0
78.01/32 15} 63.7] — |2080]12.35/21.20| 97.5
69.7/2680| 46.8] — |1735]32.30/35.10) 255]

=
rE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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125 Volt
CRETE

 

 

 

 

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¢

TRST "Be

The test was mate on an induction inotor wanufsar=
tured by ths fSeneral Electric Co. It is a % nnase, 5 HePe,
2°20 volts mathine runiin: at 1200 RPM. and drers 13.2 aiperas
of 60 avoele currant at Pill load. The fantory musber is 183020,
Tyna KT-5—5A, Fora C5o

A rons brake shovm in Fire 1 WAS used to measure the
maehaniaal outnute A 2200 volt alternator furnished the scur=
rent, and by maans of transforiers was chanved fron 2 rnase,
2200 volts to 3% nhasa, 250 vyoltse

The tures nhases ware then csonientert to the sesoni=
aries of three transforiers conestet Ye This Y sonnection

fornis 4 halanead svstend so thit the wattneter,as snov-n in

BSSEt—110, 16951L"AS 1/2 of total inrat to tre motor.
 

 

Re VOLT INDUCTION MOTOR
ede ecd cee U Ory ae ae
SH.P., S3PHASE, 1200RPM. 6POLE.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STRAY POWER
AMPS!/WATTSI|VOLTS SPEED
ey) 25 220.0} 3200 | RUNNING LIGHT |
24.250] 540 ‘sae ROTOR LOCKED
BRAKE. FEST READINGS.
AMPS. |WATTS] VOLTS] SPEEO LOAD | M.P. T EFF.
5.85 62:5| 27:0 1190 foe) :
“eR 8 $7.0 " j 87 Fie) 0,35 Pert =)
6.900 PTW) iF eh a) Oo. 7 aoe a
6.50 3.3.7.0 on eee eo 225 ae) 8 8.0
7-00 450.0 ms ay at ds) ioe} i | 89.0
ant) 5 35.0 7 11 65 338.5 2.02 ae
8.50 630.0 ve 1t6o 46.5 2.43 96.0
We t. 9 47.0 rn et er) 2.84 94.0
11.35 1030.0 re ee) 72.5 Riko) 94.0
i¢ tO bf kOe Oo 7 ar) 82.5 4.45 aa)
yy ee - in ae Pr ri} 89.0
14.785 |14¢70.0 7 1120 102.5 5.40 91,0
15.80 |; 665.0 F tes wer §.9° = Fse]
(7.85 [1800.0 re (1o7 eres CH.YA 86.0
20.00 120725.0 S ae) 132.5 6.90 3.8

 

 

 

 

 

 

 

 

 

STATOR RESISTANCE =.49 OHMS
EQUIVALENT ROTOR RESISTANCE

COMPUTATIONS
FROM CIRCLE DIAGRAM

 

=.347 OHMS.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PT. EACtoR [oUt BUT | EFF.  |TOTALHPIFULL Loan] TORQUE PO TT a hp
if 44.4 ee 74.0 (ore) Re ] 2.5 0.09 Wd
2.| 76.9 eed ES! rs 15.8 69 0.28 15.6
3.]| 9°09 a a ee ee "2 Ee] 14.6] 0.64 eK)
4.| 94.7 ae r-1 EL 498 50.4 22.1 0.96 50.0
5 | 94.0 Co ee ee eo 6.66 6 6.6 29.7 ee) iy ate.
6.| 943 6206] 94.0 8.28 85.7 37.0 164! 83.5
Z| 945 T396| 93.4 9.90] 100.0 44.0} 2.06] 109.0
8.| 94.0 Ce Ce ee re Eee, Rl ae
9.| 920/119O4] 91-.0}/1580] 159.8 rg ie, 3.66] 161.7
10| 89.5 |14046| 89.4/]18.80] 1900 86.0| 4.70| | 94.0
i-]$ 86.0 [+5582] 85.0 |}20890] 210,0 97.2| 6.02| 2200
SR Be A as a ~ 1 a Oo Oe a a 11.30] 2480
13) 63411503060] 68.0|]20.10/ 203.1| 10401 15.10] 2350

 

 
 

 

 

 

 

     

 

 

 

 

EL | |
i | gieie9 evens
r=)
ers Ny
| aia meST
ae =
Soplmemieeae: Seaeee 3]
yaa. 2]
iol 7
NS aah ie
oo Gee 3 xt
SS &

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 

 

 

 
 

 
 

 

 

5
2.

 

50 HR PPI ao) leg

 

 

hoe ey = A.C, GENERATOR

 

 

 

 

 

 

rele a

SET-UP FOR TEST N22

i

 

 

 

R2oav erates

 

 

 

 

 

 

 

 

 

SHP

Pee

MOTOR

bd

oe

 

 

 

 

 

 

 

 

 

 

 
TEST 730

The machine used in this tert was built bv the
Wastinghouse BHlestrisn Co. It is a 2 rhase, 10 H.P., 200
volts, induction motor, snesd 1200 R.P.Me The factory
nunhber is 7A0A6.

A nronvy hrake was use to ineasure the iischanical
outyute The 2urrent for this wotor was taken froi a 42200
Volt alternator and stennead dorm to 220 volts bv means af
transforierse Ths retoum in this nadine was tre rotor

insteat of t*5s 34:40”. -
 

ZS Ccna Car
Meethst-) en) rao aoe

STRAY POWER READINGS
AMPS | WATTS| VOLTS] SPEED
'4.7| 470 | 200 | //92 [RUNNING Rant
£5.0/ 590 oie 2d seperee Gs (ieee ee

BRAKE TEST READINGS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AMPS |WATTS| VOLTS|SPEED| LOAD [od+2u7] He, | ZEFF
15.0} 600} 200] 1190] 00° 0.0; 16] 0.0
18.0} 2050) « | 11851100 eric ol-675
21.5): 3000] .-. | 11721 6s 61/ 80] 753
reo TY Ty) ee ea Qa Abas
oho} 1+) Me edo] Pao 9.1} 11.5] 794
59.0/4575| «= [145/265 25) (22| 77.7
351.0) 4800) «= [1140/2685 |] 102! 128! 793

 

 

 

 

 

 

 

 

ROTOR RESISTANCE =.64 OHMS
EQUIVALENT STATOR RESISTANCE =.273 OHMS

COMPUTATIONS FROM CIRCLE DIAGRAM
ie aa FO ice Dae Salsa ed cen
$85| 1279 55.2] 17] zt, 7S 06| 20
55.6] 2753| 687| 37/ 45! 1641 1.1] 44
A ea eX ee) dh
(rAd dee XU) ee
(EEL ee
IY Ye ce
835/10821| 727/ 145| 176 676) 62] 182
83.0/11 762] 70.0; 157] 192] 747/75] 200
81.2/12842| 642] 172] 209] 841] 104] 227
CaCI

 

 

 

 

 

 

 

 

 

 

 

 

 

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: Se Paco 01/4)

 

 

 

 

 

 

 

 

 

 

 

 

 

50 HR A200 VOLT
MOTOR Ac, GENERATOR
| 125 Volts ih PS apres! 4

rae DPREYPEES
VNeeee's'

 

 

 

 

 

 

 

 

 
   

   

SET-UP FOR TEST N23

  

AROV BAOV

    
 

10 HR.
A PHASE
MOTOR

 
   

 
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