Specific design features Our sensor design for optimal measurement performance
Various structural modifications to the chip layout and/or system design enable us to improve the properties of our xMR sensors and systems. The patented solutions, described more closely below, also contribute to smaller sensor dimensions, higher signal quality and reduced sensitivity to stray fields. Some functions use the special sensor behavior in order to use the additional information or properties of the sensor in unusual ways.
FreePitch sensors have been optimized to the extent that they can be used independent of the pole length of the measurement scale. This has the benefit of them being particularly compact and coming very close to a point sensor. They are the ideal choice if a particularly cost-effective solution is needed for the measurement task. In order to keep the dimensions as small as possible, the Wheatstone bridges are nested within each other. In order to generate the sine/cosine signals, both bridges are positioned at an angle of 45° to each other. FreePitch sensors can be used with pole rings or linear scales with almost any pole length, as well as with dipole magnets.
FixPitch sensors are adjusted to the pole lengths of the measurement scale, i.e. MR strips are geometrically coordinated to a specific pole length. The sine and cosine signals are generated by distributing the Wheatstone bridge resistances along the single pole. This geometric arrangement contributes to the suppression of the harmonics and a reduction in the sensitivity to stray fields. This optimizes the linearity of the sensor.
The PurePitch design is an extension of the FixPitch concept in which the MR resistors are distributed across several poles. This has an averaging effect on errors in the measurement scale without any signal delay. Because the sensor averages over north and south-poles this principle also serves to suppress the influence of homogenous stray fields better. These improvements are reflected in a higher performance in control systems where these sensors are implemented.
The PerfectWave design is applied in order to optimize the signal quality of the FreePitch sensors. The MR strips that serve as resistors have a curved form which is used to filter the harmonics when mapping the magnetic field direction in an electric signal. This filtering is implemented using the special geometry and arrangement of the MR strips and does not cause any additional signal propagation delay. The PerfectWave design is particularly effective for small magnetic fields and results in improved linearity, higher accuracy and better signal quality.
SelfBias is a design feature that allows the optimal setting of the operating point for MR sensors in applications where an external bias field is necessary. Here, a hard magnetic layer is integrated directly into the sensor element, thus avoiding the need for separate, external magnets to provide the bias field.
MagnetoResistive sensors feature a high bandwidth, virtually no switch-on delay and can be manufactured with a high resistivity. This makes them ideal for energy-efficient applications and systems. MR sensors can be used at full capacity yet still with high energy efficiency in battery-powered applications, for example, in EX-environments. Due to their special design, TMR sensors are an ideal platform for energy-efficient applications. Their high internal resistance is combined with a highly dynamic performance and high output signal strength. This enables longer battery lives and energy-efficient circuit designs.
The sensor modules featuring SmartFit technology offer additional functions in evaluation electronics. On the one hand, parameterization is possible via the signal line. This allows a built-in sensor module to be re-parametrized (e.g. for changing the measurement resolution) without needing additional wiring. On the other hand, the operating status can be indicated remotely , to inform the user about the correct function or about operating disturbances. This helps the user during installation and adjustment and allows quick and easy status monitoring during operation. SmartFit technology therefore offers comfort functions that make the sensor system safer, better and easier to use. Both functions are offered individually or in combination in SmartFit sensor modules.
ZeroInertia is a dynamic property that can be achieved using these products. No additional elements or components are used as the measurement scale because existing mechanical components can be used for the measurement system, i. e. no additional moments of inertia are added to dynamic systems that might reduce the efficiency and performance of an optimally designed system. For example, with ZeroInertia, a tooth structure can be machined directly onto the motor shaft as a measurement scale – no additional pole rings have to be driven and/or moved and the system remains highly dynamic.
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