Improved Angle Calculation Method of Magnetic Absolute Encoder with Different Magnetic Flux Densities

カテゴリ: 論文誌(論文単位)

グループ名: 【D】産業応用部門（英文）

発行日: 2024/11/01

タイトル(英語): Improved Angle Calculation Method of Magnetic Absolute Encoder with Different Magnetic Flux Densities

著者名: Takashi Ohhira (Department of Electrical, Electronic, and Communication Engineering, Chuo University), Yuto Watanabe (Department of Electrical, Electronic, and Communication Engineering, Chuo University), Hideki Hashimoto (Department of Electrical, Electr

著者名(英語): Takashi Ohhira (Department of Electrical, Electronic, and Communication Engineering, Chuo University), Yuto Watanabe (Department of Electrical, Electronic, and Communication Engineering, Chuo University), Hideki Hashimoto (Department of Electrical, Electronic, and Communication Engineering, Chuo University)

キーワード: absolute encoder，magnetic encoder，adaptive filter，phase-locked loops (PLLs)，normalized least mean square (NLMS)

要約(英語): This paper proposes an angle calculation method to improve the accuracy of a magnetic absolute encoder with different magnetic flux densities (MAE-DMFD). Magnetic encoders have a conflicting relationship between the absolute angle calculation and high resolution. The MAE-DMFD is a magnetic absolute encoder that is proposed to solve the relationship. It can achieve both multipolarity and absolute angle calculation by using a magnet with magnetic force difference inside the encoder to characterize the magnetic force signal. However, the angle calculated with a magnetic force difference by the characterized magnetic force signals is greatly affected by external disturbances such as harmonics and observation noise. Additionally, the conventional angle calculation system of the MAE-DMFD uses second-order phase-locked loops (SO-PLLs) based on orthogonal signals. To use SO-PLLs, the steady-state estimation error should occur when the operating velocity changes. Therefore, this paper proposes an improved angle calculation method that considers disturbances, noise, and estimation error. The proposed method uses a higher-order PLL to compensate for the steady-state error and applies an adaptive filter to the orthogonal signal to consider the effects of noise and harmonics. The proposed method can efficiently remove noise, harmonics, and angle estimation errors. The effectiveness of the proposed method is demonstrated on an actual MAE-DMFD.

本誌: IEEJ Journal of Industry Applications Vol.13 No.6 （2024）

本誌掲載ページ: 625-632 p

原稿種別: 論文／英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejjia/13/6/13_24001332/_article/-char/ja/