Open-Loop Control of Voice Coil Motor With Magnetic Restoring Force Using High-Low Frequency Composite Signals

Yu-Hao Chang; Chien-Sheng Liu; I-Wei Chen; Meng-Shiun Tsai; Hsiang-Chun Tseng

doi:10.1109/ACCESS.2019.2945882

IEEE Access (Jan 2019)

Open-Loop Control of Voice Coil Motor With Magnetic Restoring Force Using High-Low Frequency Composite Signals

Yu-Hao Chang,
Chien-Sheng Liu,
I-Wei Chen,
Meng-Shiun Tsai,
Hsiang-Chun Tseng

Affiliations

Yu-Hao Chang: Department of Mechanical Engineering, National Chung Cheng University, Chiayi, Taiwan
Chien-Sheng Liu: ORCiD; Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan
I-Wei Chen: Department of Mechanical Engineering, National Chung Cheng University, Chiayi, Taiwan
Meng-Shiun Tsai: Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan
Hsiang-Chun Tseng: Department of Mechanical Engineering, National Chung Cheng University, Chiayi, Taiwan

DOI: https://doi.org/10.1109/ACCESS.2019.2945882
Journal volume & issue: Vol. 7
pp. 146258 – 146263

Abstract

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This study proposed an approach to control voice coil motors (VCMs) installed in smartphone modules as autofocus actuators. The VCM developed in this study comprises guide rods. The magnetic field attraction force between guide rods and movable parts serves as lens restoring force. This study did not use feedback elements to avoid the stick-slip phenomenon between VCM guide rods and movable parts. Instead, this study used a high-low frequency composite signal based on the findings from a mathematical model analysis and VCM dynamic attribute analysis, preventing stick-slip and offering the VCM a more favorable positioning precision.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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