Axial limit force

The axial limit force is the maximum permissible longitudinal force (or axial force), shown asF_a in Fig. 8. If the axial limit force is exceeded, the ability of the transducer to measure may be permanently damaged.

In HBM torque transducers the axial limit force sets an upper limit to the service range. Torque transducers can be used for measurement if the axial forces do not exceed the axial limit force. However, there may be some effect on the measurement signal. The upper limit for this influence is separately notified in the specifications.

The permissible axial force gets smaller than the specified axial limit force if another irregular stress occurs (such as a bending moment, lateral force or exceeding the nominal torque). Otherwise the limit values have to be reduced. If for example 30 % of both the bending limit moment and the lateral limit force occur, only 40 % of the axial limit force is allowed in the case that the nominal torque is not exceeded. If parasitic loads occur as continuous vibrating loads, the respective permissible vibration bandwidths may differ from the respective limit loads.

Lateral limit force

The lateral limit force is the maximum permissible lateral force (in the case of radial force), shown as F_r in Fig. 8. If the lateral limit force is exceeded, the ability of the transducer to measure may be permanently damaged.

In HBM torque transducers the lateral limit force sets an upper limit to the service range. Torque transducers can be used for measurement if the lateral forces do not exceed the lateral limit force. However, there may be some effect on the measurement signal. The upper limit for this influence is separately notified in the specifications.

The permissible lateral force gets smaller than the specified lateral limit force if anotherirregular stress occurs (such as an axial force, bending moment or exceeding the nominal torque). Otherwise the limit values have to be reduced. If for example 30 % of both the axial limit force and the bending limit moment occur, only 40 % of the lateral limit force is allowed in the case that the nominal torque is not exceeded. If parasitic loads occur as continuous vibrating loads, the respective permissible vibration bandwidths may differ from the respective limit loads.

Bending limit moment

The bending limit moment is the maximum permissible bending moment, shown as M_b in Fig. 8. If the bending limit moment is exceeded, the ability of the transducer to measure may be permanently damaged.

In HBM torque transducers the bending limit moment sets an upper limit to the service range. Torque transducers can be used for measurement if the bending moments do not exceed the bending limit moment. However, there may be some effect on the measurement signal. The upper limit for this influence is separately notified in the specifications.

The permissible bending moment gets smaller than the specified bending limit moment if another irregular stress occurs (such as an axial force, lateral force or exceeding the nominal torque). Otherwise the limit values have to be reduced. If for example 30 % of both the axial limit force and the lateral force limit occur, only 40 % of the bending limit moment is allowed in the case that the nominal torque is not exceeded. If parasitic loads occur as continuous vibrating loads, the respective permissible vibration bandwidths may differ from the respective limit loads.

Fig. 8: Parasitic loads - axial force F_a, lateral force F_r, bending moment M_b