Results 171 to 180 of about 28,776 (207)

Design and Optimization of Reduced Torque Ripple Rotary Voice Coil Motor

2018 XIII International Conference on Electrical Machines (ICEM), 2018
Voice coil motors (VCMs) are becoming more popular due to their small size and high dynamic performance. They are commonly used in hard disk drives and vibration isolators in optical systems. Torque ripple is an important performance index for rotary VCM.
Cakal, Gokhan, Zeinali, Reza, Keysan, Ozan   +2 more
openaire   +2 more sources

Vibration reduction control of a Voice Coil Motor (VCM) nano scanner

2007 7th IEEE Conference on Nanotechnology (IEEE NANO), 2007
This paper presents vibration reduction control of a voice coil motor (VCM) nano scanner. We had developed a VCM scanner. The scanner has flexure hinges structure. However, the VCM nano scanner has some problems of thermal drift and small damping compared to the PZT driven nano scanner.
Jong-kyu Jung, Woo-seub Youm, Kyi-hwan Park   +2 more
openaire   +1 more source

Voice coil motor nano stage with an eddy current damper

2008 10th International Conference on Control, Automation, Robotics and Vision, 2008
This paper presents a nano positioning mechanism with flexure hinge and damper. The nano stage represented in this paper consists of a leaf spring guides and the voice coil motor (VCM) since it provides long working range and the control is easy. However, when the leaf spring is used alone, mechanism has very small damping, which reduces the system ...
null Yongdae Kim, null Byounguk Sohn, null Woosub Youm, null Jongkyu Jung, null Jonghyun Lee, Kyihwan Park   +5 more
openaire   +1 more source

Application of voice coil motors in active dynamic vibration absorbers

IEEE Transactions on Magnetics, 2005
A dynamic vibration absorber reduces the influence of a force whose excitation frequency nearly coincides with the natural frequency of a rotating machine. However, the performance of this type of passive absorber can be affected by changes in the environment.
null Yi-De Chen, null Chyun-Chau Fuh, null Pi-Cheng Tung   +2 more
openaire   +1 more source

Optimal control of a voice-coil-motor with Coulombic friction

2008 47th IEEE Conference on Decision and Control, 2008
The voice-coil-motor is a widely used mechatronic device, which represents a typical electrodynamic actuator for machine tool axes, bonding machines and hydraulic/pneumatic valve drives. One principal task consists in steering the system precisely to a prescribed target in minimal time or with minimal energy.
Bahne Christiansen, Helmut Maurer, Oliver Zirn   +2 more
openaire   +1 more source

Thickness Minimized Magnetic Circuit for Rotary-Type Voice Coil Motor

Japanese Journal of Applied Physics, 2005
As the demand for small-form-factor disk drives for mobile devices increases, the miniaturization of voice coil motor (VCM) actuators playing important roles in track seeking and track following is an issue. In this study, we have determined that a multisegmented magnet array (MSMA) can reduce the total thickness of the magnetic circuit for a ...
Jeong, JH, Lee, JH, Yoon, HK, Gweon, DG Gweon, Dae-Gab   +3 more
openaire   +2 more sources

Fuzzy Control Based on Reinforcement Learning for Voice Coil Motor

2005 ICSC Congress on Computational Intelligence Methods and Applications, 2006
Dealing with voice coil motors, this paper presents reinforcement learning based fuzzy control, which incorporates characteristics of reinforcement learning into fuzzy control. Fuzzy control has excellent characteristics of dealing with model uncertainty and nonlinearity.
T.S. Liu, W.K. Chang
openaire   +1 more source

Analysis of flat voice coil motor for precision positioning system

2011 International Conference on Electrical Machines and Systems, 2011
The analysis of a flat voice coil motor (VCM) with Halbach array structure is described. The motor is applied for precision positioning system. Because of omitting boundary condition, the method of images is adopted to predict the distributions of global and local magnetic field for obtaining precise calculations.
Liyi Li, Donghua Pan, Yongbin Tang, Tiecheng Wang   +3 more
openaire   +1 more source

Auxiliary coupling disk for miniature vibration voice-coil motors

The Journal of the Acoustical Society of America, 2005
An auxiliary coupling disk for miniature vibration voice-coil motors aims to couple with a magnetic weight element to change the relative position of the auxiliary disk eccentric from the rotational center of the motor so that the magnetic weight element can generate vibration during rotation. The auxiliary coupling disk further can alter the vibration
openaire   +1 more source

Trajectory tracking control of voice coil motor under gravity disturbance

Proceeding of the 11th World Congress on Intelligent Control and Automation, 2014
In comparison with traditional servo motor systems, direct drive linear motors do not require any intermediate transmission link and have the advantages of simple mechanism, fast dynamic response, high precision, low noise and little vibration. In this work, we investigated the tracking control problems of a linear voice coil motor placed on the ...
Sheng Zhang, Bali Ma, Sheng Lin, Jianjun Li   +3 more
openaire   +1 more source