Trends in contactless position and angle measuring technology NOVOTECHNIK
These include inductive linear sensors which may be a wear-free replacement for classic potentiometer solutions, interference-resistant- high-precision magnetostrictive position transducers for large measuring ranges and multiturn sensors that use the GMR effect.
There is a new linear sensor for the steering angle detection on hydraulic cylinders which operates inductively and is, for example, suitable for all steel cylinders with a trough-going piston rod commonly used today.
Inductive position transducers with practice-oriented features
With the inductive position transducers of the LS1 series, Novotechnik has now added a wearfree alternative to virtually all small linear potentiometers with a square cross-section commonly available on the market to its product range. The position transducers, which operate according to the NOVOPAD method, feature dimensions which are completely compatible with the potentiometers
of the T series. They are available either with an integrated return spring and measuring ranges between 25 and 100 mm, or as position transducers with a backlash-free ball coupling for pulling or pushing applications and measuring ranges between 25 and 200 mm. The integrated signal processing function provides the measured value as an absolute current or
voltage signal at the output. In many application cases, the integrated teach-in function with a status LED which is also integrated is especially practical. At the press of a button directly on the position transducer it is possible, for example, to select the zero and end point of the measurement, turn or invert the characteristic line or set the desired signal excursion. In contrast to
potentiometers, a separate measuring transducer is not required for this purpose. The position transducers offer convincing arguments with a good repetitive accuracy (better than 0.025 % of the measuring range), a high resolution (12 or 13-bit) and linearity (up to +/- 0.1 %). The update rate of the output signal is approx.1 kHz, which is more than sufficient for a large number of applications.
The fact that the inductive position transducers are completely unaffected by magnetic fields is sure to be an additional advantage in many applications.
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27 January 2012
