Eddy-Current Rotor Position Sensor

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Seiji Shimizu, Sumida Electric Co.,Ltd.


An Eddy-Current Rotor Position Sensor was developed for traction motors of HEV, EV. It serves – similar to a Resolver – to determine the angular position of the rotor in synchronous motors.It is compact and light weight, even at large rotor size and is proved to be insensitive to magnetic distortion. The arc shaped sensor module offers layout flexibility and allows easy installation and service. There is a good robustness to mechanical tolerance. The unique features of this technology can be very advantageous in applications with corresponding requirements. This article introduces the operating principle, simulation results and layout configurations and shows examples for applications.

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