Torque Seminar 24.05.2015, Page. 1Hottinger Baldwin Messtechnik GmbHKlaus Weissbrodt The nominal...
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Transcript of Torque Seminar 24.05.2015, Page. 1Hottinger Baldwin Messtechnik GmbHKlaus Weissbrodt The nominal...
18.04.23, Page. 1 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar The nominal (rated) sensitivity
The nominal (rated) sensitivity Cnom is given by the span between the output
signal at nominal (rated) torque Mnom and at zero torque related to nominal
(rated) torque Mnom.
Output signal at
zero torque S0
Output signal at
nominal (rated)
torque Sn
Characteristic curve
(increasing torque)
Ideal straight
Actual straight
Sensitivity
tolerance
Nominal (rated) torque Mnom
Act
ual s
igna
l spa
n
Nom
inal
sig
nal s
pan
nom
nnom M
SSC 0
18.04.23, Page. 2 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar The nominal (rated) sensitivity
18.04.23, Page. 3 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar
15kHz
10kHz
5kHz
+10V
0V
-10V
-Mn+Mn0-Mn
+Mn0
The nominal (rated) sensitivity
18.04.23, Page. 4 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar The sensitivity tolerance
The sensitivity tolerance dC is the permissible deviation of the actual output
signal span at nominal (rated) torque Mnom from the nominal output signal
span.
18.04.23, Page. 5 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar
The linearity deviation including hysteresis dlh is the maximum deviation of the output
signal value from the reference straight line which is the best-fit straight line through
the starting point. The parameter dlh is specified as a percentage of the nominal
(rated) sensitivity Cnom.
Linearity deviation including hysteresis
Output signal at zero torque S0
Ascending series
(increasing torque)
Descending series
(decreasing torque)
Reference straightOutput signal at
nominal (rated)
torque Sn
18.04.23, Page. 6 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar Linearity deviation including hysteresis
18.04.23, Page. 7 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar Temperature effects
The temperature effect on the zero signal TK0 is the variation of the unloaded
transducers output signal related to the nominal (rated) sensitivity Cnom,
caused by a 10K change in temperature.O
utpu
t sig
nal
Torque
TK0
18.04.23, Page. 8 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar Temperature effects
18.04.23, Page. 9 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar Temperature effects
Out
put s
igna
l
Torque
TKC
The temperature effect on the sensitivity TKC is the variation of the loaded
transducers output signal related to the actual value of signal span, caused by
a 10K change in temperature.
18.04.23, Page. 10 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar Temperature effects
18.04.23, Page. 11 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar Temperature effects
Both temperature effects appear together.
Out
put s
igna
l
Torque
TK0 + TKC
18.04.23, Page. 12 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar The relative standard deviation of the repeatability
S1,100%
S1,50%
S2,100%
S2,50% Sn,50%
Sn,100%
Time
100%
Torque
50%
0
n
i iSnS
1 %50,%50
1
n
i iSnS
1 %100,%100
1
Arithmetic mean of the measuring signal Si
at 50% or 100% of nominal (rated) torque,
n = number of measurements
21 %50%50,
%50%100%50, 1
11
n
i irel SSnSS
21 %100%100,
%50%100%100, 1
11
n
i irel SSnSS
18.04.23, Page. 13 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar The relative standard deviation of the repeatability
18.04.23, Page. 14 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar Load limits
Nominal (rated) torque
Maximum service torque (see amplifier)
Limit torque
Breaking torque
Torque
Capable to measure,limit values maintained
Capable to measure,limit values not maintained
No permanent variation or damage Permanent variation or damage possible
Mechanical destruction possible
Not capable to measure
0
see data sheet
18.04.23, Page. 16 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar
bMbMaF aF
rF
rF
The axial limit force Fa is the maximum permissible longitudinal force.
The lateral limit force Fr is the maximum permissible radial force.
The bending limit moment Mb is the maximum permissible bending moment.
If one of the above parameters is exceeded, the ability of the transducer to
measure may be permanently damaged.
The permissible limits of the above parameters get smaller than the specified
limits, if at least two of these irregular stresses occur simultaneously or if the
nominal (rated) torque is exceeded.
Load limits – parasitic loads
18.04.23, Page. 17 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar Load limits – parasitic loads
18.04.23, Page. 18 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar Load limits – parasitic loads
18.04.23, Page. 19 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar Load limits – permissible oscillation bandwith
Tor
que
Time
+ 5kNm
- 5kNm
Example: torque flange T10FS / 5kNm, oscillation bandwith (peak to peak): 8.000Nm
8kNm
8kNm
The permissible oscillation bandwith is the oscillation amplitude of a
sinusoidally varying torque, with which the transducer can be stressed for at
least 10•106 vibration cycles without causing any significant variations in its
metrological properties.
18.04.23, Page. 20 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar Load limits – permissible oscillation bandwith
18.04.23, Page. 21 Hottinger Baldwin Messtechnik GmbH Klaus Weissbrodt
Torque Seminar Torsional stiffness
The torsional stiffness cT describes the relation between torque and elastic
torsion over the axis of rotation.
D
T
Mc
DM
DM