Position sensors target high speed electric motors in automotive applications
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.
In addition to the actual sensor element, the AS5x47U series products include analog signal conditioning and a DSP engine. They deliver their output in a selection of common formats:
- Incremental ABI output, now with a higher resolution of 14-bit instead of the 12-bit output of earlier versions of the AS5x47 family.
- UVW output for implementation in commutation of brushless DC motors (BLDC).
- Digital PWM signals that can be processed directly by an external microcontroller or microprocessor.
- The high-speed SPI interface is now protected by 8-bit CRC.
The AS5147U is supplied in a compact 14-pin TSSOP package. The AS5247U with two This comes in the slightly larger 32-pin TQFP package with 7 x 7 mm. Both sensors are qualified to AEC-Q100 Grade 0.
More information: https://ams.com/as5147u, https://ams.com/as5247u.
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