8
T32FNA
2
Construction and function
2.1
Construction
The schematic design of a torque transducer is given in Fig. 2.1. The torque
transducer consists of a measurement body which is screwed to the measure-
ment object by means of two flanges.
The hollow shaft which forms the measurement body is equipped with strain
gauges. Inside the hollow shaft there is the electronic circuitry for the bridge
excitation voltage and for the transmission of the measurement signals. Fur-
thermore, the shaft housing is equipped with 30 teeth for speed measurement
and with transmission elements for the inductive transmission of the supply
voltage onto the measurement body as well as elements for capacitive trans-
mission of measured values from the shaft to the housing of the torque trans-
ducer.
The rotor, consisting of the actual measurement body and the two flanges, is
fitted to the housing by two spindle bearings. The housing also contains pre-
amplifiers for the torque signal and for the speed signal, as well as two induc-
tive proximity detectors which serve to detect the speed and the sense of rota-
tion. The housing also carries the connection plugs for the measurement
cables.
1. Toothed wheel (speed measuring system)
5. Inductive voltage transmission (coils)
6. Strain gauge application
2. Connection box
3. Inductive pick--ups
4. Inductive voltage transmission
7. Mounting plate
Flange A
Flange B
1
2
3
4 5
6
8
8
8. Shaft ends of the object
7
Stator:
Rotor:
Fig. 2.1:
Mechanical construction
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