Magnetic stray fields pose an enormous obstacle for safety critical applications. This presentation will illustrate how a magnetic position sensor approach with build in stray field immunity offers an integrated solution that is ideal for a wide range of motion- and motor-control applications for industrial and automotive markets.
Various methods for measuring flux density have evolved, leading to the development of the fully integrated position sensor IC or magnetic position sensor, which incorporates the magnetic sensing element, signal conditioning and signal processing on a single chip. magnetic technology is considered as more robust and reliable than alternative sensing methods for position sensing, since it is unaffected by the dust, dirt, grease, vibration and humidity commonly found in harsh automotive and industrial applications.
Design engineers who use conventional MPS are increasingly running into a problem, however: interference from stray magnetic fields, which tends to corrupt the MPS’s output or reduce the signal-to-noise ratio (SNR) to unacceptable levels. Even the known risk of malfunction due to stray magnetism is damaging to safety-critical designs, which in the automotive field must comply with the stringent risk-management requirements of the ISO26262 functional safety standard.
The increased risk has emerged as electrification in vehicles has been extended. Motors and cables carrying high current are particularly powerful sources of stray magnetism; these can equally be found in many industrial applications.
Attendees will learn about which arena stray field immunity is going to become an increasingly important attribute of magnetic position sensing, safety critical applications where magnetic stray field can cause false measurements due to the stray field influence, methods to protect the sensor from stray fields and how to built-in immunity into a sensor IC, and the superior performance of a built-in immunity position sensor IC demonstrated in the laboratory with extremely harsh conditions.