Inductance & Stroke Estimation Method based on Current Slope of LRA

カテゴリ: 研究会(論文単位)

論文No: LD18022

グループ名: 【D】産業応用部門 リニアドライブ研究会

発行日: 2018/02/02

タイトル(英語): Inductance & Stroke Estimation Method based on Current Slope of LRA

著者名: キム ギュナム(大阪大学),平田 勝弘(大阪大学)

著者名(英語): Gyunam Kim(Osaka University),Katsuhiro Hirata(Osaka University)

キーワード: リニア共振アクチュエーター|インダクタンス|モータパラメータ推定|ストローク|ＰＷＭ|センサーレス|Linear Resonant Actuator|Inductance|Motor Parameter Estimation|Stroke|PWM|Sensorless

要約(日本語): This study presents an on-line inductance estimation method and a sensorless stroke estimation method of a linear resonant actuator (LRA). In general, the stroke of the LRA can be obtained from the voltage equation. In order to calculate the stroke from the voltage equation, effective resistance, force constant and effective inductance are required. Especially, the inductance may change due to the difference of the effective air-gap with respect to the position and magnetic saturation. Therefore, it is necessary to estimate the inductance during operation and update its value continuously. This paper proposes a method to estimate the inductance during operation by using the current slope in the pulse width modulation (PWM). Furthermore, not only a method to estimate the back electromotive force (EMF) from the inductance but also a method for estimating the displacement and the stroke are introduced. The effectiveness of the proposed methods is validated by the results of the simulation.

要約(英語): This study presents an on-line inductance estimation method and a sensorless stroke estimation method of a linear resonant actuator (LRA). In general, the stroke of the LRA can be obtained from the voltage equation. In order to calculate the stroke from the voltage equation, effective resistance, force constant and effective inductance are required. Especially, the inductance may change due to the difference of the effective air-gap with respect to the position and magnetic saturation. Therefore, it is necessary to estimate the inductance during operation and update its value continuously. This paper proposes a method to estimate the inductance during operation by using the current slope in the pulse width modulation (PWM). Furthermore, not only a method to estimate the back electromotive force (EMF) from the inductance but also a method for estimating the displacement and the stroke are introduced. The effectiveness of the proposed methods is validated by the results of the simulation.

原稿種別: 英語

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