ML20136F269
| ML20136F269 | |
| Person / Time | |
|---|---|
| Issue date: | 02/01/1999 |
| From: | Hackett E NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | Kamal Manoly NRC (Affiliation Not Assigned) |
| References | |
| NUDOCS 9902120234 | |
| Download: ML20136F269 (48) | |
Text
<
February 1,1999 MEMORANDUM TO: Kamal A. Manoly, Acting Chief Mechanical Engineering Branch Division of Engineering, NRR FROM:
Edwin M. Hackett, Acting Chief N
Electrical, Materials and Mechanical Engineering Branch Division of Engineering Technology, RES
SUBJECT:
TRANSMITTAL OF PRELIMINARY DC MOTOR ACTUATOR TEST DATA The subject data in the attachment is transmitted as requested. The attachment includes descriptive information about the de motor actuator that was tested at the Idaho National Engineering and Environmental Laboratory (INEEL) and it identifies the issues addressed by the tests. The testing of this third de motor actuator was completed in December 1998, and concludes all testing planned for this project.
The information contained in the attachment is preliminary until all of the de motor actuator test data has been leviewed, validated, and the final report completed. The final report is expected to be issued in the Spring of 1999, if you have any questions on the attachment, please contact Jerry Jackson (415-6650) of my staff.
Attachment:
As stated Distnbution:
Branen Reading File t
Document Control Desk 2
Public Document Room D
TScarbrough
.e a}'{,.id DTerso Stagen 2
DOCUMC'iT NAME: G UJACKSON'OCoATA It rece6ve 6 copy of this document, kulicate in the boa: 'C' e Copy without 8tt4Chment/ enclosure *(* e Copy w,th attachmentip%oture r - no copy
, 125 Ituute l A L ruute I
I omca tuuta n Naur A
> s.o.on VC V.
- vor. m /d444 e n.a.n E2 ETA cAtt */s
- 1 i 2 Fees F y i V iss' Ai3 iso OFFICIAL RECORD COPY Re$ File Code: 15 6 9902120234 990201
~
i m
l Preliminary Results of Direct Current Motor Actuator Testing 1
Kevin G. DeWall John C. Watkins Idaho National Engineering and Environmental Laboratory
}
t Jerry E. Jackson i
USNRC, Project Manager i
I N F_ F I
IDAllO N ATION AL ENGINEERING & ENVIRONMENTAL LABOR ATORY I
cc
-3 i
t
)
i
?
Scope The INEEL dc motor actuator tests will answer the following questions:
. How does the actual output torque, current, and speed of the dc motor compare with the published torque, current, and speed?
. How does the output torque, current, and speed of the dc motors change at reduced voltage and how does this compare with l
predictions?
How does the output torque, current, and speed of the dc motors change at elevated temperature and how does this compare with
~
predictions?
How does the output torque, current, and speed (stroke fine) of the dc motors change as the motors heat up under high load conditions?
What is the actual efficiency of the actuator gearbox and how do the high loadings and low motor speeds affect the actual efficiency?
How do the high lo'adings and low motor speeds affect the actual valve stem and stem nut efficiency and load sensitive behavior?
GC99 0043 2
i i
~
Test Design Three actuator motor and gearbox combinations are being tested SMB-1 with a 40-ftib dc motor-Class B SMB-0 with a 25-ftib dc motor-RH insulated SMB-0 with a 10-ftib dc motor-RH insulated Data from previous testing of an SMB-1 with an older 40-ftib dc motor was also evaluated Three test sequences are performed with each actuator combination Stroke Test
+ Provides initial baseline data
+ 1 static and 2 loaded valve stroke simulations
+ 80 and 100% voltage tests Low Voltage Test
+ Gradually increasing stem load until rnotor stalls
+ 60,70,80,90, and 100% voltage tests
, Motor temperature held between 70 and 100 F High Temperature Test
+ Gradually increasing stem load until motor stalls
+ 80 and 100% voltage tests
+ 70,100,150,200,250 and 300 F
{
Test Design - Actuator Information Older i
SMB-1-40 SMB-0-25 SMB-0-10 SMB-1-40 Motor Rated Torque (ftib) 40 25 10 40 Motor Stall Torque (ftib) 62 40 16 63 Motor Speed (rpm) 1900 1900 1900 1750 Motor Gear Set Ratio 32:40 37:35 25:47 32:40 Worm Gear Ratio 34:1 37:1 h
37:1 34:1 Overal! Ratio (OAR) 42.50 34.96 69.56 42.50 Running Efficiency 0.50 0.55 0.50 0.50 Pullout Efficiency 0.40 0.40 0.40 0.40 Stall Efficiency 0.50 0.55 0.50 0.50 Stem Diameter (in) 2.13 1.75 1.25 2.13 Stem Pitch / Lead 1/4:1/2 1/4:1/4 1/4:1/2 1/4:1/2 Stem Speed (in/ min) 22.4 13.6 13.7 22.4 j
\\
GC99 0043 4
Test Design - Motor Nameplate Data 40-ftib Motor 25-ft!b Motor 10-fttb Motor Old 40-fttb Motor Manufacturer Porter Peerless Peerless-Winsmith Peerless-Winsmith Porter Peerfess Frame D202G DK56H DG56D D202G Voltage 125 125 125 125 Time Rating Duty 5 Min 5 Min 5 Min 5 Min Serial Number XF64300 ZV47576 OW49138 HG50272 HP 2.89 40-fttb 1.805 25-fttb 0.72 10-fttb 40-fttb KW Insulation Class RH RH Shunt Field Amps RPM 1900 1900 1900 1750 Amps 24 14.5 6.5 Rise *C 115 115 115 Amb*C 40 40 40 Type Winding Comp.
Comp.
Corp.
Comp.
175-34-0009-0 176-18-0048-0 176-18-0047-0 O
GC99 0043 5
Test Design - Instrumentation TCS Channel Description Calibration Channel 55 Dc line current (L2)
Yes Channel 71 Dc line voltage (L1 -L2)
Yes Channel 76 Motor series field current (S1)
Yes Chanr4e! 77 Motor shunt field current (F1)
Yes Channel 78 Motor armature current (A1)
Yes Channel 73 Motor series field voltage (S1 -S2)
Yes Channel 74 Motor shunt field voltage (F1 - F2)
Yes Channel 75 Motor armature voltage (A1 - A2)
Yes Channel 72 Motor speed Yes Channel 40 Motor torque Yes Channel 01 Motor temperature Surface Thermocouple No, Ref. Only Channel 02 Motor temperature, Surface Thermocouple No, Ref. Only Channel 15 Thermocouple Reference Junction No, Ref. Only Channel 66 Torque switch trip No, Ref. Only Channel 64 Torque spring pack deflection Yes Channel 33 Torque spring pack force Yes Channel 48 Stem torque Yes Channel 49 Stem torque Yes y
Channel 32 Stem thrust Yes Channel 64 Stem position No, Ref. Only GC99 0043 6
4 n
Preliminary Results This research addresses the terms in the typical formula for predicting output torque for a valve actuator.
Toutput = Tmotor ht F F
Eff OAR temp app gearbox rat where T
= output torque of the valve actuator output T
= rated starting torque of the electric motor
- mo10, i
V
= actual voltage supplied to the motor ou V
= the motor's rated voltage rat n
= 2 for ac motors,1 for de motor F,,mp
= factor to account for losses due to motor heating F
= application factor (not evaluated in this research) opp Eff
= gearbox efficiency i
w arw x OAR
= overati actuator ratio oc,, o,,
SD 8
S 9
0 4
0 V
O r-IOI E
m m
.E
- E k
o.
~
i
Pr.eliminary
-10 dc Comparison with Manufacturer's Curves 60 q 50 E
8 40 Test data l
t-30 l
a Manufacturer's ctnve i
E 2 10 1
i j
0 O
2 4
6 8
10 12 14 16 18 I
i Motor torque (ft-Ib) 2500 t
- 2000 M*#****#8 ""
E i
c.
1500 Test data corrected to 125 Vdc and 70*F
[
O1000 8
i s
3 5h0 Test data s
0 1
0 2
4 6
8 10 12 14 16 18 Motor torque (ft-Ib) l ces 0023 2 i
_.. j
Preliminary SMB-0-10 dc Reduced Voltage Tests C 200 60 L
2 150 E
100 %
h 40 f
80 90 100 %
70 go 60
- )#
I'oo
),glh M T*~
f3 o 20 s
E 50 8
}
o 10 2
3
'^'
5 0
0 2
0 2
4 6
8 10 12 14 16 18 0
2 4
6 8
10 12 14 16 18 Motor torque (ft-Ib)
Motor torque (ft-Ib) 130 2000 120 1500
$ 110 E
2, 90 8-e 100 t-
?
O 80 ca 1000
~ 70 90 80 B
500 80 g
h 70 60 60
'3 ' "
60 0
2 0
2 4
6 8
10 12 14 16 18 0
2 4
6 8
10 12 14 16 18 Motor torque (ft-Ib)
Motor torque (ft-Ib)
C99 0023 3
i Preliminary SMB-0-10 de Reduced Voltage Tests 2000
+
Calculated value 1500 T-N
.N....N k
x i
'N N \\
E'
.x.
I I
\\
500
~
100 %
i i
i i
i i
i i
e i
i 0
0 2
4 6
8 10 12 14 16 18 s
Motor torque (ft-lb) c
.m W
Preliminary SMB-0-10 dc Reduced Voltage Tests 2000
+ Calculated value (both torque and speed)
. k' 1500
+.sx 3
l' i
N.x 3
+
2
+
500
\\
~
100 %
\\
80 70 60 i
iiiiii ii i
i=
0 0
2 4
6 8
10 12 14 16 18 Motor torque (ft-Ib) cn s
. Preliminary SMB-0-10 Elevated Temperature Tests (100% voltage) c L
60 1
500 8s
^
~
E400 y
50
~
70
,p UU E 300 gp" 40 150 c.
250 pg g
g h200 6
150 15 WA 100 20
.f-100 g
10 O
0
.a a
e a
e i
e s
e a
e a
2 0
2 4
6 8
10 12 14 16 18 0
2 4
6 8
10 12 14 16 18 l
Motor torque (ft-lb)
Motor torque (ft-Ib) 125 2000 L
I WOO A 1003 120 300*F A "
150 25o 5
h2
~
a 70 115 0
0 2
4 6
8 10 12 14 16 18 0
2 4
6 8
10 12 14 1e, 18 Motor torque (ft-lb)
Motor torque (ft-Ib) i C99 0023 6
i
. Preliminary SMB-0-10 dc Elevated Temperature Tests l
(100% voltage) 2000 t
'\\
1500
[
E o.
D y
- 3.8 ft-Ib @ 10 ft-lb i
889 rpm e
1000 r n.
i S
's o
t E
soo
'N l
s
)
1 i
i i
i i
i i
i 0
i i
i 0
2t 4
S 8
10 12 14 16 18 i
Motor torque (ft-Ib)
C99 0023 7
Preliminary I
SMB-0-10 de Elevated Temperature Tests 1
(100% voltage) 2000 l
+ Calculated value j
f 1500 j
E l
i 8
~
O 1000
+
+
++
+
e 1
g 15 i
2 l
500
+
+
l s
N \\
N Y
j 300 2 2
150 100 70 F l
l i
i i
ie i
i i
i I
i i
0 0
2 4
6 8
10 12 14 16 18 l
i s
Motor torque (ft-lb)
Preliminary SMB-0-10 dc Elevated Temperature Tests (80% voltage) e L 500 60 e
i 0
l
$400 5.
p 40 7
3
- F 70 E 300 g 250
,go E
2so 2w y
. 2m f 200 ~
,s f l
20
- }'}'g'
,go
.55 o
_. /*
70
[100 g
10 O
o g
3 o
2 0
0 2
4 6
8 10 12 14 16 18 O
2 4
6 8
10 12 14 16 18 Motor torque (ft-Ib)
Motor torque (ft-Ib) 105 2000
{ 100 g.
y 1500 3
f1000
\\
6 g
'x 2'
300*F f
95 200,h l
O 1M 70 S
500 o
O E
1 2
300
{0 90 O
O 2
4 6
8 10 12 14 16 18 0
2 4
6 8
10 12 14 16 18 t
Motor torque (ft-lb)
Motor torque (ft-Ib) cu mn a
Preliminary SMB-0-10 de Elevated Temperature Tests (80% voltage) 2000 i
i f
1500 f
i m
y
.,2.5 ft-lb @ 6.5 ft-lb l
g 1000 889 rpm
\\}
I
~
i x
1 500 iiib1 0
i i
i i
i i
i i
i i
O 2,
4 6
8 10 12 14 16 18 Motor torque (ft-Ib) j
. Preliminary SMB-0-10 dc Elevated Temperature Tests l
(80% voltage) 2000
+ Calculated value I
1500 Es 3
1000 w+
\\
~
\\
500
+\\++'N
+
NN'x
\\200 r
250 k1' O 70 F 300 i
e i
i i
di >
~
j O
i i
i i
i 0
2 4
6 8
10 12 14 16 18 Motor torque (ft-lb) i C99 0032 2
Preliminary 4
I SMB-0-10 de Actuator Stroke Tests i-O Low i
m
-5000 MMum 3
k i
E -10000 High 2
E E -15000 j
h 2w l
L
-20000 3
SMB-0-10 de 100% Voltage
-25000 O
2 4
6 8
10 12 Time (s) 0 Low Medium g
f HI h 9
-10000
- s
.U I
E -15000 l
S i
-20000,,
L L i
w SMB-0-10 dc 80% Voltage j
-25000 0
2 4
6 8
10 12 l
Time (s)
{
C99 0023 10 i
f
Preliminary SMB-0-10 de 100% Voltage Test 500 7
100 0 d g 400 E!
g Calculation
~'~
3 g
~
300 E -200 E
Pultout 3
200 Efficiency
[ -300 g
caicuiatim b
5 joo
-400 0
-500 f
0 2
4 6
8 10 12 14 16 18 0
2 4
6 8
10 12 14 16 18 Time (s)
Motor torque (ft-lb) 10 0
g g_.
-10 E.20 2
5 -30 O2
\\
40
-50 O
2 4
6 8
10 12 14 16 18 Time (s)
C99 0023 11
Preliminary SMB-0-10 de Gear Box Performance 500 Running Efficiency
'g 400 calculation d
100 %
90 %
e 300
.3 h
s 80 %
o
/
70%
~ 200 60 %
Ee
@ 100 Pullout Efficiency Reduced Voltage Test 0
0 2
4 6
8 10 12 14 16 18 Motor torque (it-Ib)
Running
[
EIficiency Running Calculation g 400 70*F
$400 uIa pm
/
100*F ih, Efficiency g
0 E
op 1 0*
S 300*F S
~
270*F
/
220*F 2
E E
320*F Pullout Efficiency CD Calculation s
100
[,
W 100 j
Eleva'.ed Temperature Test (100% Voltage)
Elevated Temperature fest (80% Voltage) 0 0
O 2
4 6
8 10 12 14 16 18 0
2 4
6 8
10 12 14 16 18 Motor torque (ft-lb)
Motor torque (ft-lb)
C99 0023 12
Preliminary c
SMB-0-10 de 100% Voltage Test 0
40000 0.12 0.13 d -10000 h30000 E
E E
2 -20000 2 20000 i
5 E
/
h h
/
M -30000 M 10000 4gggg 0
0 2
4 6
8 10 12 14 16 18 0
100 200 300 400 500 Time (s)
Stem torque (ft-Ib) 100 L
0
- 9
-100 f
E -200 l
2 h
-300 M
\\
-400
-500 O
2 4
6 8
10 12 14 16 18 Time (s) c,. - e
l r
lL t
j
{!'!
l(t
- l
0 0
0 0
'234 5
234 5
1 1 1 1 1 1
)e 000 g
t 0O0 se a
u T
lto e
V m
e lt g
0 0
o a
0 0
c o
4 0
4 c
8 V
(
t d
s
)
)
e e
n 0
c b
T b
0 u
l I
e 1
d 0
t 0
t 4
r e
f F
f 0
(
2 u '
3 a
0
(
R 0
3
'0F a
t e
0 e
F 7*
r 0
e u
u 3
m
,2F m
q p
0 0
q 9
2*0 r
c r
7F e
o o
, #' 2
- T t
t 0
d 0
0 r
2 e '
0 m 0 m 3
ta 2
2 e v
e o
0 t
t e
S 6
S lE fr 0
0 e
0 0
1 1
P t
0 0
0 0
0 0
0 0
0 0
0 0
u0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
3 2
1 4
3 2
1 N4 h6 8g Ee0 mOq g
~ E2U
)
3 m
005 234
)
1 1 1 e
e lt 000 ga o
t V
0 S
0 F
0 4
F/'
0 0
1 0
5
(
)
0
^
e 1
ts b
F-F e
I 1
T 0
t 0
0 f
7 5
e '
0
(
d 2F ru 3
e t
0 a
u 0
re q
,3 p
r 0
m o
e t
T 0
1 d '
0 m e
2 e
ta t
v S
0 le E
0 0
yB 1
ranM 0
imS 0
0 0
0 0
i 0
0 0
0 l
0 0
0 0
e 0
0 0
0 r
4 3
2 1
P 0gg[~Em3 5
c l
ll
4 a=
i s
O "O
OT I
T"'
s E
u)
T3 O
6 m
.E 5
2 n.
Preliminary Comparison with Manufacturer's Curves 120 Test data h 80 E
l t-60 i
3U Manufacturefs curve f
8 40 o2 20 t
[
0 0
10 20 30 40 50 60 Motor torque (ft-lb) j 3000 1\\
_ 2500 -
Manufacturers curve E
i
$ 2000
\\
E 1500
' Test data corrected to 125 Vdc i
(no temperature correction) j 1000 o
500 Test data 0
O 10 20 30 40 50 60 l
Motor torque (ft-lb) j oc m2. 2
- Prbliminary Old SMB-1-40 de Comparison with Manufacturer's Curves 3000 2500 1
\\
T 2000 i
o_
D j
a k
1500 1
2 Manufacturer's curve i
2 I
o 3
1000 Manufacturer's test f Id motor 500 l
0 0
10 20 30 40 50 60 j
Motor torque (ft-Ib) l l
c.co....
pre 11minary old SMB-1-40 dc Comparison with Manufacturer's Curves 3000
~
y 2000 i
o.
D
?
~
f u
S Corrected new 1000 motor data
{
motor a a
~
~
I 0
O (0
20 30 40 50 60 Motor torque (ft-lb) i i
GC99 0028 4 l
Pfeliminary Old SMB-1-40 dc Reduced Voltage Tests 120
@100 100%
80 go 80 p
e 60 70 5
60 40 m
50 2
h 20 4
t..
..E a
e e a n..
e... t
....In 0
10 20 30 40 50 60 Motor torque (ft-Ib) 2000 130
~
120 g
j110
~ ' *% 100%
- g. 1500 S 100 N%
v 1000 m:
90 39
?
80
,g D
500 70 7
60 70 k
2
\\
50 60 N 50
.m.....
o so 0
10 20 30 40 50 60 0
10 20 30 40 50 60 Motor torque (ft-lb)
Motor torque (ft-Ib)
GC99 0028 5
l I
j l
t l
li jf i'
i s
a 06 m
t i
sa s
e e
c u
i o
e lav T
d e
ta 0
l i
5 e
uc la g
C 0
e 0
a 1
i
+
t l
0 o
i 4
i V
i b
9
)
I t
i f
d 0
(
8 i
e e
i 3
q 0
u r
c i
o t
u i
o r
+
t d
i o
6 i
M
+
e 0
+
i 2
R i
0
+
5 e
e
+
i
+
d i
i 0
1 0
i e
\\
1 i
i
-B i
i 0
yM 0
0 0
0 0
0 0
0 0
0 5
0 5
r S 2
1 1
an imd i-r@& 3zE il l
e O fP
' Prbliminary c
Old SMB-1-40 de Reduced Voltage Tests 2000 t
+ Calculated value
~
(both torque and speed) i 1500 l
E
~
o.
6 i
A 1000 8.
\\
N l
+
l 2
o2 500
'N 50 60 70 80 90 100 %
l 3
3 i
i f
I t
l i
i i
1 l
t i
i 9
j i
i l
l l
8 g
l l
l t
t 0
10 20 30 40 50 60 Motor torque (ft-Ib) i f
oc
=2.
7
'Pr5Ilminary Old SMB-1-40 Elevated Temperature Tests (100% voltage) 120 _
l
^ 100 1 70 o.
h 150 goo r 80 C
l
@ 60
~
g 40
~
mo y 20 o
O 10 20 30 40 50 60 Motor torque (ft-Ib) 2000 t
j 130 1500
\\\\
~
200 150 g1000 t
3g 3 110
,o 500 N
100 70
~o 0
250 O
W 100 0
10 20 30 40 50 60 0
10 20 30 40 50 60 Motor torque (ft-lb)
Motor torque (ft-Ib)
GC99 0028 8
s Pr'eliminary Old SMB-1-40 dc Elevated Temperature Tests (100% voltage) 2000 i \\
~
1500 I
E i
D
[
o_
l u
8 1000 E5 l
~O l
2
,8 ft-lb @ 40 ft-lb
[
500 274 rpm j
'N i
b i
~
iiiiiii>>>iiiii iiiiii o
i 0
4 10 20 30 40 50 60 Motor torque (ft-lb) i n
GC99 0028 9
Preliminary Old SMB-1-40 de Elevated Temperature Tests (80% voltage) 120 E 100
}
E8 80 70*F joo.p E
200*F 150*F 250*F E
60
}
a 40
}
3 j
j 20 0
0 10 20 30 40 50 60 Motor torque (ft-Ib) 2000 120 110 g
p 1500 o
g 0
1
- F 1000 100*F f
500
'YOO*F E
2 70 y
70*F
'E 60 o
o 10 20 30 40 50 60 0
10 20 30 40 50 60 Motor torque (ft-Ib)
Motor torque (ft-lb)
GC99 003
.0
Preliminary Old SMB-1-40 dc Elevated Temperature Tests (80% voltage) 2000
~
1500 to
\\
}
g
\\
1000
~
100 F 150 F 3
200 F
,,6 ft-Ib @ 30 ft-Ib 500 274 rpm 70 F 250 F i
i i
i i
iie i
i i
i i
i i
i i
i i
i i
i i
i i
i 0
0 10 20 30 40 50 60 Motor torque (ft-lb)
GC99 0028 1i
Preliminary Old SMB-1-40 de 100% Voltage Test 200 800 e
700 Running i
0 3
Efficiency
_%w I l
-;- 600 Calculation B
ab 5
t s
5 -200
@500 E 400 L
c-O Pullout o
~ -400 E 300 Efiiciency Calculation o
/
d5.600 i
100 j
^
I
-800 0
O 2
4 6
8 10 12 14 16 18 0
10 20 30 40 50 60
[
Time (s)
Motor torque (ft-Ib) l 10 f
0 1
ma g -10 l
$ -20 I
E S -30 o -40 I
S 1
E
\\
-50 i
-60 l
0 2
4 6
8 10 12 14 16 18 Time (s) l GC99 0028 12
?
m hreliminary Old SMB-1-40 dc Gear Box Performance 800 f
Running 700 Efficiency 0 600 Calculation 2
=*
1(m'.
E
%" 90%
g 500 y 80%
E 400 f h - 70%
g f - 60%
~
E 300
~
50 %
h200 Pullout Efficiency 100 Calculation Reduced Voltage Test I
'/
0 o
10 20 30 40 50 60 Motor torque (ft-Ib) 800 800 Running 700 Running 700 70*F Efficiency m
Efficiency
.-N F 100*F O 600 Calculation 0 600 Calculation
_g E
9 150*F n
o-p pgg F e 500 250*F e 500 100*F 3
7 ' 150*F 3
E 400 200*F 250*F 400 E 300 j
E 300 Pullout Efficiency 3
Pullout Efficiency 3
Calculation u) 200 Calculation
/
u) 200 Elevated Temperature Test (100% Voltage)
Elevated Temperature Test (8C% Voltage) 0 0
O 10 20 30 40 50 60 0
10 20 30 40 50 60 Motor torque (ft-Ib)
Motor torque (ft-Ib)
GC99 00:'8 13
1 I
i Gearbox Efficiency versus Speed The "ol owing data plots show t1e actuator efficiency versus worm slaft i
rotationa s3eed.
Although the curves behave somewhat different at higher speeds, they converge at ower s 3eeds, w1ere t1ey cross below the pul out efficiency va ue of 0.4.
1 i
[
i
a
?
I
$W4-10 de, Geerten Efklency versus Worm ShsR Opeed, Reduced Vehage Test,M h h M 0.0 I
}
4 4
0.6 l
\\
f a
M
/
50.4-4 j
0.3 -
7 0.2 0
S N
0E0 050 1000 1200 1400 feet 1000 2000 rpm w;
R
. g
.g l
,1
._ _ g
!I 5
~
I d
a f
3C
.g g I
.r 1
1 I
g 4
K
.g D
'N k
M
G
- *.nasee emunem
,g ee e.e.
... =
3I
/
I
__/
g
.g I
i i
1 1
1 l
s
. -I 4
s
.g s
1 x,N h
N aei o
o o
o e*
M e-
Preliminary Observations Performance Curves l
How does the actual output torque, current, and speed of the dc motor compare with the published torque, current, and speed?
l
. With both speed and torque corrected for voltage,
- The performance of the 10-ftib dc motor was well above manufacturer's curves.
- The performance of the older 40-ftib dc motor was below manufacturer's curves.
. Motor current was slightly higher than the manufacturer's curve j
for both motors.
t l
l l
c.c 3.
(
Preliminary Observations i
Reduced Voltage How does the output torque, current, and speed of the dc motors change at reduced voltage and how does this compare with predictions?
i
. Contrary to the linear reduction in motor torque due to reduced voltage recommended in Limitorque SEL-3, a linear relationship overpredicts available motor torque if speed is held constant.
l
. A linear reduction in both motor torque and motor speed comes l
very close to actual motor performance at reduced voltage.
)
GC99 0043 9
(
l
l Preliminary Observations Elevated Temperature l
I How does the output torque, current, and speed of the dc motors change at elevated temperature and how does this compare with predictions?
. Contrary to the reduction in motor torque due to elevated j
temperature recommended in Limitorque SEL-5.
l
- At rated torque, the 10-ftib motor lost 3.8-ftib from 70 to j
300 F.
- At rated torque, the older 40-ftib motor lost 8-ftlb from 70 to 250 F.
t I
oc9e otus to
l l
Preliminary Observations High Load Performance i
How does the output torque, current, and speed (stroke time) of the dc motors change as the motors heat up under high load conditions?
l l
. Changes in running load can have significant effects on valve stroke time.
i
. Increased stroke time can lead to additional motor heating and further degrede motor performance.
t
. Motor winding temperature increased 50 to 70 F during individual stall tests.
. Motor winding temperature increases rapidly at low speeds and high loads.
i
Preliminary Observations Gearbox Efficiency What is the actual efficiency of the actuator gearbox and how do the high loadings and low motor speeds affect the actual efficiency?
. The published running efficiency was not adequate for predicting gearbox performance, especially at higher loads.
. The published pullout efficiency was adequate for moderate loads and higher speeds, but some data fell below pullout.
. The gearbox efficiency is lower with lower speed.
Preliminary Observations Stem Nut Efficiency How do the high loadings and low motor speeds affect the actual valve stem and stem nut efficiency and load sensitive behavior?
. The high loads and slower speeds appear to have little effect on stem nut friction.
. The rate-of-loading effect decreases at slower motor speeds.
GC99 0043 13
I I
The opinions presented here today are-those of the authors and not necessarily l
endorsed by our sponsor, the USNRC.
t i
m,, -,.
I i