Magnetoelastic torque measurement – versatile, long-lasting, value-for-money
The measurement system refined by MELECTRIC works on the principle of magnetoelastic torque measurement, i.e. that a ferromagnetic material’s magnetic field changes when forces act upon it. These changes are measured and evaluated by the sensor electronics, which are positioned on the shaft that is to be measured without contact, and no additional parts are attached to the actual component transferring the forces. This fully contact-free torque measurement process is what makes magnetoelastic technology unique.
No changes to the shaft
The measurement method is based on the magnetisation of the shaft. Shafts made from a variety of different ferromagnetic DIN or standard materials are suited to this method. We are happy to offer advice on which materials to use. The magnetisation process that we have developed does not alter the shaft’s geometry, material properties, or surface finish. The magnetisation is only performed once. From then on, lifelong torque measurement is possible without any ageing effects.
Magnetoelastic torque measurement made by MELECTRIC
MELECTRIC has made significant refinements to the magnetoelastic torque measurement process. The various additional manufacturing steps help the system to achieve an especially high level of process stability. Our contactless torque measurement solution is therefore market-leading when it comes to sensor precision, offers extremely high long-term stability, and is not sensitive to coatings of the shaft, as even the manufacturing process takes place entirely contact-free.
Advantages of our technology
Surrounding
Extremely high robustness
The magnetic field remains stable throughout the lifetime of the component.
Resistant to oil, excellent vibration resistance.
Usable up to approx. 180 °C depending on the positioning of the electronics.
No additional parts are attached to the measuring body.
MEASUREMENT
Accuracies of up to 0.1% are possible, depending on the surrounding conditions.
Very high signal resolution up to 25 kHz with very low attenuation as e.g. glue joints are omitted.
All common digital and analogue output signals are possible.
The typical accuracy is about 1% FS.
Excellent scalability with low investment and unit costs due to low system complexity and high process stability.
Wide spectrum of possible applications
Our solution enables precise measurements to be taken within a high torque range, from 1 Nm to several thousand Nm. As no additional components are applied to the shaft itself, it is possible to take measurements at rotation speeds of up to 300,000 rpm. The measurement accuracy is typically 1% FS and the signal bandwidth is usually 1 to 2 kHz, but can be increased to over 25 kHz for customer-specific applications. In addition, the evaluation electronics makes it possible to measure additional data, such as temperature, acceleration, and rotation speed. MELECTRIC offers many different options in terms of both analogue and digital output signals (0-5 V, 0-10 V, 4-20 mA, CAN BUS, I2C, UART, Bluetooth,…).
A maintenance-free alternative to conventional torque measurement
The system is completely wear-free as a result of the contactless torque measurement. Even in the event of strong vibrations, impacts, weather effects and temperature fluctuations, it continues to deliver precise and reliable data, demonstrating that magnetoelastic torque measurement is both a robust and affordable alternative to mechanical torque measurement.
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