3D Static Magnetic Field Analysis of Torque and Rotor Shaft Attraction Force of Narrow-Gap Stepping Motors for Driving the Hands of a Wristwatch

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: 2022/01/01

タイトル(英語): 3D Static Magnetic Field Analysis of Torque and Rotor Shaft Attraction Force of Narrow-Gap Stepping Motors for Driving the Hands of a Wristwatch

著者名: Norio Miyauchi (Miyauchi Technical Consultant)

著者名(英語): Norio Miyauchi (Miyauchi Technical Consultant)

キーワード: holding torque，detent torque，rotor shaft attraction force

要約(英語): In this study, a three-dimensional static magnetic field analysis was conducted on a narrow-gap stepping motor for driving the hands of a wristwatch. The purpose of this analysis was to design a stepping motor with a low power consumption, by calculating the holding and detent torques and rotor shaft attraction force in two cases, namely a rotor with no eccentricity and a rotor with 5μm eccentricity. We analyzed why existing stepping motors are constrained to a gap width of 300μm. We further confirmed that the rotor shaft attraction force, which is derived from the rotor eccentricity, increases rapidly with the decrease in gap width, which in turn has a negative impact on the stepping motor. In the future, we intend to study the movement of a wristwatch comprising a metal wheel bearing, to design a stepping motor with a narrow gap, and subsequently reduce the power consumption.

本誌: IEEJ Journal of Industry Applications Vol.11 No.1 （2022）

本誌掲載ページ: 128-137 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/11/1/11_21004527/_article/-char/ja/