Position sensors target high speed electric motors in automotive applications

June 03, 2020 //By Christoph Hammerschmidt
Position sensors target high speed electric motors in automotive applications
With two new rotation angle sensors, Austrian semiconductor manufacturer ams wants to support the electrification of safety-critical vehicle functions such as steering assistance, braking systems and active suspension struts. The two new sensors provide more precise measurements in easy-to-process standard outputs.

The new AS5147U is an intelligent magnetic rotary angle sensor chip for use in electric motors with speeds of up to 28,000 rpm. The AS5247U is a version of the same sensor with two stacked dies to provide the necessary redundancy for demanding safety applications according to ASIL D.

These new products are ams' response to industry's efforts to build safer, smarter and greener vehicles by enabling more efficient operation of high speed motors. The sensors use the new DFS (Dynamic Filter System) technology for more accurate noise-free position measurements at rotational speed. The Dynamic Angle Error Correction (DAEC) technology in the sensors enables near-zero latency at high speeds for extremely accurate, real-time angle measurements.

The devices also feature embedding comprehensive self-diagnostic features to support automotive manufacturers in their programs to meet the stringent specifications of ISO 26262 for functional reliability. The AS5x47U now includes CRC (Cyclic Redundancy Check) protection for communication with external components.

At the same time, the new sensors should enable lower costs for the implementation of the engine control system: As usual with ams, the new position sensors are immune to interference from stray magnetic fields thanks to a patented differential sensor architecture. This means that the sensor does not require shielding as protection against external magnetic fields from motors, electromagnets, high-voltage cabling and other sources. Motor systems with such devices can therefore be made smaller and more reliable, and their material and production costs are lower than solutions with sensors that require magnetic shielding.

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