Inductive position sensor for high-speed traction motors
The Austrian sensor and semiconductor manufacturer ams has introduced an inductive position sensor for high-speed electric motors in automobiles and industrial machines. The chip offers the same accuracy and latency as the resolvers commonly used for high-speed motors in solutions for determining the rotor position with the AS5715. However, it should enable considerable savings in material costs, size and weight. The IC is based on an ASIL-C implementation in accordance with ISO 26262; redundant implementations thus allow solutions to be developed that correspond to the highest ASIL-D safety level.
The introduction of inductive position sensors in semiconductor technology, as in the IC at hand, is a further step towards the electrification of automotive systems, e.g. power steering, as well as drive systems in electric and hybrid vehicles. The AS5715 inductive sensor is largely configurable and can be used in topologies at the end of the shaft or next to the shaft as well as with many types of motors with multiple pole pairs.
The AS5715’s precise measurement and low latency support the operation of electric motor control systems and allow high speed motors with maximum torque, low torque ripple and high efficiency. A position sensor system consisting of an AS5715 and the associated coil as conductor track on a simple low-cost printed circuit board achieves accuracies up to ±0.3° at speeds up to 100,000 min-1 with various motor types, including PMSM with four pole pairs.
For the entire electric motor market (including traction motors), a cumulative annual growth rate (CAGR) of 8.3% by value is predicted, equivalent to an estimated $34.6 billion in 2021. At the same time, the development in the electric motor market is that permanent magnet synchronous motors (PMSM) will replace brushless DC motors in many high speed applications.
The AS5715 also supports automotive manufacturers’ programs to meet the ISO 26262 standard for functional reliability. A fully redundant measuring system can be created with two AS5715s on the sensor board.
An evaluation kit for the AS5715 inductive position sensor is available from ams on request.
Further information: https://ams.com/as5715R
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