Electronics and Semiconductors

Position sensors for high-speed electric motors to improve car industry’s electrification efforts

08 June 2020

New position sensors from Ams are designed to lower system cost and enhance electrification of safety-critical vehicle functions such as power steering, active damper control and braking for safer, smarter and greener cars.

The two position sensors bring new benefits and a lower system cost to the automotive industry. The Ams AS5147U is an intelligent magnetic rotary position sensor chip for use in electric motors that run at speeds up to 28,000 rpm. 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 sensor solutions enable more efficient operation of high-speed motors by use of new DFS (Dynamic Source: AmsSource: AmsFilter System) technology for more accurate, low-noise position measurements at rotation speed. The DAEC (dynamic angle error correction) technology in the sensors enables almost zero latency at high speed for ultra-accurate, real-time angle measurement.

A comprehensive set of self-diagnostic features supports automotive manufacturers’ programs for complying with the strict specifications of the ISO 26262 functional safety standard. The new AS5x47U sensors also implement cyclic redundancy check protection on communications with external devices

The cost of implementing motor control is reduced as all Ams position sensors are inherently 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 devices also enhance the Ams position sensors’ digital signal processor core, which performs measurement processing inside the chip. Measurement outputs in standard UVW, ABI and PWM formats are easy for automotive designers to implement in new, smarter vehicle control systems.

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

To contact the author of this article, email engineering360editors@globalspec.com

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