Abstract
The purpose of this paper is to propose and implement a novel rotor position detection method for permanent magnet synchronous machines (PMSMs) based on linear Halls, which are embedded inside of stator of PMSMs. A three-phase 9-slots/8-poles PMSM is exampled to verify the method. Firstly, a special point located in stator yoke (back-iron) is found by two-dimensional finite element analysis (2D-FEA), where the open-circuit flux-density due to permanent magnets versus rotor position (B PM) shows a high amplitude and good linearity, while the armature-reaction flux-density (B armature) due to armature currents exhibits a low amplitude and good linearity versus armature currents. Then, an analytical model is built and the analytical relationship between armature currents and the B armature is derived. Based on the analytical mode, B PM can be obtained by separating the B armature from the synthetic magnetic field (B Synthetic). Thereafter, the resultant B PM can be used to detect the rotor position information with differential-type piecewise-linear analytical method. The feasibility of the proposed detection method is verified by co-simulations and experiments. The simulation results show that the novel linear Hall-based angle sensor can achieve the accuracy equivalent to 3000-line. The experimental results indicate that compared with an encoder, the maximum error of electric angle position at different speeds is less than 0.3%.
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Acknowledgment
This work was supported in part by the National Natural Science Foundation of China under Grant 51825701 and Key R&D Program of Jiangsu Province under Grant BE2019073.
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Wang, Y., Liu, K., Hua, W., Zhu, X., Wang, B. (2020). Concept and Implementation of a Rotor Position Detection Method for Permanent Magnet Synchronous Machines Based on Linear Halls. In: Zamboni, W., Petrone, G. (eds) ELECTRIMACS 2019. Lecture Notes in Electrical Engineering, vol 615. Springer, Cham. https://doi.org/10.1007/978-3-030-37161-6_3
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DOI: https://doi.org/10.1007/978-3-030-37161-6_3
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