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Installation Guide Linear Rotary Motors
•
The torque measuring shaft is used to measure static as well as dynamic torques. The
sensor can measure both right-hand and left-hand loads. The measured variable is
suitable for control, regulation and monitoring tasks.
•
Torque peaks exceeding the permissible overload (see specifications in the PR02 data
sheet) can lead to destruction of the torque measuring shaft. Where such peaks cannot
be safely excluded, they must be mitigated.
•
When changing between right and left load, the torque sensor may show a small
hysteresis. This may cause the sensor to exceed the specified accuracy at the
changeover point.
•
Simultaneously turning and measuring the force can falsify the measurement (e.g. due
to increased friction of the linear rotary shaft).
•
The operating temperature range of the sensors is 5 - 45 °C. Above or below the limits,
there is a measurement error which influences the measurement results. It is
recommended to set the offset to zero before each measurement.
•
The max. operating range is between 0 - 80 °C.
•
For continuously precise measuring results, it is recommended to calibrate the torque
measuring shaft annually according to section 8.3.
•
Recalibration is also strongly recommended after improper handling of the force
sensors (e.g. impacts on the linear rotary shaft or large overloads).
3.8 Option Force Sensor
The optional force sensor enables closed-loop force control with target force specification. The measurement
signal is also available to the user for the cyclical recording / evaluation of sensitive process data (e.g.
bounce force). This makes it easy to implement highly accurate, reproducible and recordable pressing &
assembly processes in accordance with Industry 4.0 requirements with high precision.
Force sensors are based on the measuring principle of strain gauges. They are designed to withstand
multiple mechanical overloads and still precisely detect the smallest forces. With this option, a suitable,
galvanically isolated measuring amplifier is automatically integrated in the linear rotary motor and provides a
measuring signal of +-10 VDC suitable for the LinMot drive.
Factory calibrations of integrated force sensors are always carried out in the installed state. This has the
advantage that the influences of the mechanics and the linear rotary motor are included.
•
The force sensor is used to measure compressive and tensile forces. The measured
variable is suitable for control, regulation and monitoring tasks.
•
Force peaks exceeding the permissible overload (see information in the PR02 data
sheet) can lead to destruction of the force sensor. Where such peaks cannot be safely
excluded, they must be mitigated.
•
When changing between increasing and decreasing forces, the force sensor may show
a small hysteresis. This can lead to the sensor exceeding the specified accuracy at the
change point.
•
Due to the static friction in the system, the force sensor measures more accurately if the
force vector always points in the same direction during repeated measurement
(influence of force hysteresis).
•
To increase the measuring accuracy, linear rotary motors with integrated force sensor
technology are supplied without sealing lips / wipers.
•
Simultaneous rotation and measurement of the force can falsify the measurement (e.g.
due to increased friction of the linear rotary shaft).
•
The operating temperature range of the sensors is 5 - 45 °C. Above or below the limits,
there is a measurement error which influences the measurement results. It is
recommended to set the offset to zero before each measuring process.
•
The max. operating range is between 0 - 80 °C.
•
For continuously precise measurement results, it is recommended to calibrate the force
sensor annually according to section 8.3.
•
Recalibration is also strongly recommended after improper handling of the force
sensors (e.g. impacts on the stroke rotating shaft or large overload).
NTI AG / LinMot
PR02-38
ENG
Page 9 / 39
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