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

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 no...

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Bibliographic Details
Published in:IEEE access 2019, Vol.7, p.146258-146263
Main Authors: Chang, Yu-Hao, Liu, Chien-Sheng, Chen, I-Wei, Tsai, Meng-Shiun, Tseng, Hsiang-Chun
Format: Article
Language:English
Subjects:
Actuators
auto-focusing
Cameras
Coils
Force
Image restoration
Lenses
Low frequencies
Magnetic resonance imaging
Mathematical model
open-loop control
Rods
Slip
stick-slip
Voice coil motor
Voice control
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Summary: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.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2945882