11
T4A, T4WA-S3
4
Loading capacity
4.1
Maximum rotation speed
T4A, T4WA–S3 torque/screw torque transducer allow torque measurement at
rotation speeds up to 4000min
–1
(for information on maintenance intervals at
the higher rotation speeds, see page 13).
4.2
Measuring dynamic torques
The T4A, T4WA–S3 torque/ screw torque transducer can be used to measure
static and dynamic torques. The following applies for the measurement of
dynamic torques:
•
The calibration made for static measurements is also valid for dynamic
torque measurements.
Note: The frequency of dynamic torque must not exceed the natural
frequency of the mechanical measuring installation.
•
The natural frequency f
0
for the mechanical measuring system depends on
the moments of inertia J
1
and J
2
of the connected rotating masses and the
transducers torsional stiffness.
Use the equation below to determine the natural frequency f
0
for the
mechanical measuring system:
f
0
+
1
2
p
·
c
T
·
ǒ
1
J
1
)
1
J
2
Ǔ
Ǹ
f
0
= Natural frequency in Hz
J
1,
J
2
= Mass moment of inertia in kgm
2
c
T
= Torsional stiffness in Nm/rad
•
The maximum permissible amplitude of vibration (peak-to-peak) may be
70% of the transducer’s nominal torque, even with alternating load. The
amplitude must be within the loading range defined by –M
N
and +M
N
.
SUNSTAR传感与控制 http://www.sensor-ic.com/ TEL:0755-83376549 FAX:0755-83376182 E-MAIL:[email protected]
SUNSTAR自动化 http://www.sensor-ic.com/ TEL: 0755-83376489 FAX:0755-83376182 E-MAIL:[email protected]