User's Manual

Table Of Contents
T12
14
A197910.0 enHBM
For settings over 100 Hz (torque low-pass filter 1 only), phase delay
compensation is run for the angle of rotation signal. This ensures that torque
and angle of rotation values that are measured simultaneously are also output
simultaneously.
Two pulse strings, offset by 90, are also available as RS422-compatible
signals for rotational speed and angle of rotation.
6 Structure and mode of operation
The torque transducer comprises two separate parts: the rotor and the stator.
Strain gages (SGs) are installed on the rotor for torque calculation.
Carrier-frequency technology (19.2 kHz carrier frequency) is used for the SG
evaluation. The rotor temperature is acquired at two measuring points and
averaged.
The electronics for transmitting the bridge excitation voltage and the
measurement signal are located centrally in the rotor. The coils for the
contactless transmission of excitation voltage and measurement signal are
located on the outer circumference of rotor side A. The signals are sent and
received by a transmitter head. The transmitter head is mounted on the stator,
which houses the electronics for voltage adaptation and signal conditioning.
Connector plugs for inputs and outputs (for pin assignment, see Chapter 9.3)
are located on the stator. The transmitter head encloses the rotor over a
segment of about 120 and should be mounted concentrically around the rotor
(see Chapter 7).
In the case of the rotational speed measuring system option, the rotational
speed sensor is mounted on the stator and the customer attaches the
associated slotted disc on the rotor. Rotational speed measurement is optical,
using the infrared transmitted light principle.