ams Announces New Position Sensors for High-Speed Electric Motors to Improve Automotive Electrification Efforts

June 4, 2020 Tiera Oliver

ams introduces two new position sensors that, according to the company, lower system cost and enhance electrification of safety-critical vehicle functions such as power steering, active damper control, and braking.

The ams AS5147U is an intelligent magnetic rotary position sensor chip for use in electric motors that run at speeds up to 28,000rpm. The new AS5247U is a dual stacked-die version, which provides the redundancy required for the most demanding ASIL D-rated functional safety applications.

The sensors incorporate new DFS (Dynamic Filter System) technology for ideal, low-noise position measurements at rotation speed. The DAEC (Dynamic Angle Error Correction) technology in the sensors enables almost zero latency at high speed, according to the company. The new AS5x47U sensors also implement cyclic redundancy check (CRC) protection on communications with external devices.

According to the company, all ams position sensors are immune to interference from stray magnetic fields thanks to their patented differential sensing architecture. With more components radiating magnetism, the sensor requires no shielding to protect it from external magnetic fields induced by charging stations, motors, solenoids, high-voltage cabling, and other sources. 

The AS5x47U products are highly integrated position measurement solutions incorporating magnetic sensor elements, analog signal conditioning, and a DSP-based processing engine.

The sensors provide a choice of convenient output formats:

  • ABI incremental outputs (industry standard), now in a higher 14-bit resolution vs. 12-bit outputs from earlier versions of the AS5x47 family.
  • UVW outputs for implementation in the commutation scheme of a brushless DC (BLDC) motor.
  • Digital PWM signals which, can be handled directly by an external microcontroller or microprocessor.
  • High-speed standard serial peripheral interface (SPI) now protected by 8-bit CRC.

The AS5147U sensor comes in a compact 14-lead TSSOP package. The dual-die AS5247U is equipped with a 7mm x 7mm 32-lead TQFP package. Both sensors are qualified to AEC-Q100 Grade 0. The AS5147U and AS5247U position sensors are available now in production volumes.

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About the Author

Tiera Oliver, edtorial intern for Embedded Computing Design, is responsible for web content edits as well as newsletter updates. She also assists in news content as far as constructing and editing stories. Before interning for ECD, Tiera had recently graduated from Northern Arizona University where she received her B.A. in journalism and political science and worked as a news reporter for the university's student led newspaper, The Lumberjack.

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