In Situ Magnetic Field Reconstruction and Torque Estimation for PMECCs

Abstract

Permanent magnet eddy current couplings (PMECCs) are widely used in industry to transmit torque through their interior magnetic field. It is important to measure the interior magnetic field of a PMECC, which helps ensure its excellent performance and prevent possible accidents. However, the distribution of magnetic fields is difficult to reconstruct <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">in situ</i> by traditional measuring or modeling approaches. This article proposes a method to continuously reconstruct the distribution of interior magnetic fields and estimate the relative parameters in a short time with a limited number of Hall sensors. A model of field-associated reconstruction (FAR) is proposed to reconstruct the distribution of interior magnetic fields using historical data and sensor positions as constraints. The slip and output torque can be estimated based on the FAR without the need to use additional speed–torque sensors. The experimental results verify the performance of the proposed method. The results show that the model performed well in the reconstruction of axial and tangential components and relatively well near the geometric boundary in the reconstruction of radial components. The relative errors in the speed and torque estimations are approximately 4% and 6%, respectively. The limitations and corresponding reasons are also discussed.