Long Stroke Sensor
There is an increasing demand to find a sensing solution that has the ability to determine linear position throughout long distances of travel. Current technology is simply a switching output along the stroke. In addition to our product line, this industry first application of MR sensing technology is developed to achieve this goal as well as serve a wide variety of applications. The application used for the evaluation of this technology is an automotive seat track and rail to determine the fore/aft position of the seat throughout 300mm of linear travel.
A magnetically back biased magneto-resistive (MR) element takes advantage of a material’s tendency to change its electrical resistance with a change in direction of an externally applied magnetic field. The MR Chip works in magnetic saturation – this means that it is not sensing the magnitude but rather the direction of the applied magnetic field. The MR element also is protected from magnetic interference which is important for automotive applications.
Magneto Resistive and Traditional Practices (Hall Effect Sensor)
Traditionally, Hall Effect sensing functions by creating a voltage potential perpendicular to the current flowing across the device. The voltage is proportional to the magnetic field strength. Contrastingly, the Anisotropic Magneto Resistive functions by varying the electrical resistance through the device depending on the direction of the magnetic field across the element. Additionally, a typical hall sensor solution will require an array of HED chips (more costly) along the entire stroke to detect the movement of a magnet. The MR sensor is up to 40% more cost effective since it requires only a single ASIC, back-bias with magnet to detect the angle of the target which spans the entire stroke.
Features and Benefits:
- New MR Design allows to track the position of the seat throughout its entire travel
- New MR Design allows this sensor to be adapted to non-power seats
- New MR design has a cost advantage over traditional Hall-effect array long stroke applications (only one MR ASIC is required, regardless of stroke length)
- New MR design does not use any moving parts within the sensor and is intended to be a non-contacting sensing solution
The MR Long Stroke Sensor has a wide variety of applications regardless of the industry and technology. With applications in the automotive industry such as pneumatic and hydraulic struts and actuators, seat back angular position, and steering rack and pinion position, the MR element can replace the technology used today and become the technology of the automotive future. Most importantly, the sensor can be used as a substitute for many elements, and above all, an addition to the modern technology needed today in any industry.
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