Implementation of Dual Three-Phase Linear Hall Sensor-Based Embedded Magnetic Encoder in Permanent Magnet Synchronous Motors

Normally, three-phase linear Hall sensor-based embedded magnetic encoder (EME) are used in permanent magnet synchronous motors to detect the rotor angle, in which prefilters are used to suppress the harmonic disturbance. However, due to the employment of prefilters, this EME system shows large estimated angle error at low-speed regions and weak dynamic response performance. In this letter, a dual three-phase linear Hall sensor-based EME system is proposed with the help of the vector space decomposition method. It can effectively eliminate the harmonic interference without introducing prefilters and the accuracy of rotor angle estimation can be improved at all-speed regions, which is validated by experiments.