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Highest measuring accuracy of torque flanges - MANNER supplies accuracy for all environments

Highest measuring accuracy of torque flanges - MANNER supplies accuracy for all environments

04 December 2020

The high-precision acquisition of all physical quantities at ambient temperatures from -40°C to 160°C as well as high speeds of 40,000 rpm represents a special challenge for measurement technology.

MANNER Sensortelemetrie is able to achieve highest accuracies over a temperature range of 200°C despite parasitic forces up to an uncertainty of measurement of almost zero due to many years of design experience, know-how and innovative electronic compensation means.

Challenge - space is not everything

The most frequently measured variable in mechanical engineering is torque. However, this is often accompanied by axial forces and/or a bending moment component. These parasitic forces have a considerable influence on the measuring accuracy. The parasitic forces and moments can be eliminated by a suitable constructive design as well as by means of electronic compensation. There are often narrow limits for constructive measures. So often only the electronic compensation is left to create highly accurate measuring equipment.

Unfortunately, the regularly determined measurement value deviations at 22°C (standard room temperature) are dependent on the temperature of the measuring body. The temperature dependence of the E-modulus changes the characteristic value strongly. The measurement value deviation resulting from temperature fluctuations is without compensation measures approx. 2.5% per 100°C temperature change - thus, for an environmental measurement range of -40°C - +160°C, up to 5% measurement value deviation is realistic with no compensation.

In addition, the measured value deviation at high speeds - especially the zero point - is also dependent on the speed driven. This parameter must therefore also be compensated electronically.

In addition to these parameters that have to be actively corrected, an overload resistance must also be taken into account in the mechanical design. This is the only way to prevent a possible destruction of the torque transducer in case of sudden blockages of the drive train (e.g. due to bearing damage). 

High-precision, maintenance- and wear-free measuring sensors in standard or customized design

In addition to the standard torque series XtreMA (HBM- T40 compatible) MANNER offers customized flange geometries for these cases.

This enables both individual physical quantities (torque, axial force, bending moment) and several simultaneously in one transducer to be recorded contactlessly and maintenance-free by means of inductive sensor telemetry.

Within the scope of a project design, your requirements such as flange pattern, installation space, temperature and force inputs are recorded and a customer-specific mechanical design is developed based on years of experience.

For highest accuracy, even if the errors due to temperature input have already been corrected, the errors due to parasitic forces and the influence of speed still remain - especially at high speeds, which are commonplace with electric drives. To correct these errors we have developed a new real-time compensation module. The developed module enables the almost complete compensation of the temperature influence (zero point and characteristic value) as well as the speed influence. These errors are caused by the modulus of elasticity change over temperature and by temperature-dependent or speed-dependent geometry changes of the measuring body, as well as by manufacturing tolerances. Due to the new non-linear compensation the accuracy of the measuring flange is maintained over the entire operating temperature range.

If desired, the measuring sensor can be integrated into a speed sensor in addition to the physical quantities. Particularly noteworthy is our laser speed version, which enables a particularly high resolution at a distance of up to 50 mm and therefore there is no risk of contact even with shaft train vibrations.

The system components - modular and flexible to combine

MANNER torque flanges can be flexibly combined with all pick-ups and evaluation units, which can transfer the measured data to the data acquisition system in the classic form of an analog signal, e.g. voltage, current, frequency +/- or also as a digital signal via EtherCAT, Ethernet or CAN interface. You can choose this, also in combination, completely at your discretion.

The contactless, inductive sensor telemetry - transmission technology - guarantees maintenance-free operation.

Depending on your requirements, the inductive transmission method can be used with a range of up to 40 mm. Thus all measured variables and the speed can be recorded comfortably. Even in case of vibrations at the drive train, this distance ensures the integrity of the measuring equipment.

Challenges in measurement technology have been our passion for 30 years - feel free to ask us about your problem - we offer the solution!

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