A Dual-Sided Hybrid Excitation Eddy Current Damper for Vibration Suppression in Low Damping Linear Motor System

This paper describes the design and proof of concept for an active eddy current damper which is integrated into a single-axis linear motor. Although developments on active eddy current damper are well documented, none has been implemented in a linear motor. The advantage of such a system is two-fold. Firstly, the relative motion between the magnets and the conducting sheet produces eddy currents resulting in an electromagnetic force opposing the direction of motion; which can be utilized to suppress vibrations. Secondly, it is possible to enhance the damping effect of the system; Due to environmental noise, it is normally not possible to increase the D coefficient in a PID controller as much as desirable. The damper is thus able to supplement this damping effect to improve settling time. Here, we will present the damper design as well as the preliminary experiment results for both vibration suppression and motion damping.

Download Full-text

Vibration Suppression Using Eddy Current Damper

Transactions of the Korean Society for Noise and Vibration Engineering ◽

10.5050/ksnvn.2003.13.10.760 ◽

2003 ◽

Vol 13 (10) ◽

pp. 760-766 ◽

Cited By ~ 14

Keyword(s):

Eddy Current ◽

Vibration Suppression ◽

Eddy Current Damper

Download Full-text

Design Procedure of an Eddy Current Damper Type Reaction Force Compensation (RFC) Mechanism for a Linear Motor Motion Stage

Volume 8: 27th Conference on Mechanical Vibration and Noise ◽

10.1115/detc2015-48080 ◽

2015 ◽

Author(s):

HyeongJoon Ahn

Keyword(s):

Eddy Current ◽

Reaction Force ◽

Design Procedure ◽

Linear Motor ◽

Lumped Parameter Model ◽

Magnetic Flux Density ◽

Eddy Current Damper ◽

Linear Motor Motion Stage ◽

Motion Stage ◽

Reaction Force Compensation

Base vibration of a linear motor motion stage has been reduced with passive RFC mechanism based on movable magnet track and springs. This paper presents design procedure of an eddy-current damper (ECD) type RFC mechanism for a linear motor motion stage. The RFC mechanism with a movable magnet track and an ECD can overcome disadvantages of the spring based RFC mechanism such as resonance and difficulty of assembly due to spring. A lumped parameter model for the ECD type RFC mechanism is derived considering sinusoidal magnetic flux density and effective width of the ECD according to magnet track motion. Then, a design procedure for ECD type RFC mechanism is proposed to meet system requirements such as transmission ratio of reaction force and maximum magnet track motion. Design example illustrates the effectiveness of the proposed design procedure for ECD type RFC mechanism.

Download Full-text

Damping Force Improvement of A Dual-Sided Hybrid Excitation Eddy Current Damper by Using Steel-Copper Plate Secondary

2021 13th International Symposium on Linear Drives for Industry Applications (LDIA) ◽

10.1109/ldia49489.2021.9505807 ◽

2021 ◽

Author(s):

Na Sang ◽

Chi Zhang ◽

Miao Yang ◽

Rong Li ◽

Shuheng Qiu

Keyword(s):

Eddy Current ◽

Copper Plate ◽

Damping Force ◽

Hybrid Excitation ◽

Eddy Current Damper

Download Full-text

Design of eddy current dampers for vibration suppression in robotic milling

Advances in Mechanical Engineering ◽

10.1177/1687814018814075 ◽

2018 ◽

Vol 10 (11) ◽

pp. 168781401881407 ◽

Cited By ~ 4

Author(s):

Fan Chen ◽

Huan Zhao

Keyword(s):

Eddy Current ◽

Vibration Suppression ◽

Milling Process ◽

Magnetic Flux Density ◽

Depth Of Cut ◽

Chatter Suppression ◽

Robotic Milling ◽

Eddy Current Damper ◽

Damper Design ◽

Milling Robot

The milling robot normally has a low stiffness which may easily cause chatter during machining. This article presents a novel eddy current damper design for chatter suppression in the robotic milling process. The designed eddy current dampers are installed on the milling spindle to damp the tool tip vibrations. The structural design and the working principle of the eddy current dampers are explained. The magnetic flux density distribution and the magnetic force generation of the designed eddy current damper are analyzed with the finite element method. The tool tip dynamics without and with eddy current dampers are modeled, and the damping performance of the proposed eddy current dampers in the robotic milling process is verified through both simulations and experiments. The results show that the peaks of the tool tip frequency response function caused by the milling tool modes are damped significantly, and the stable depth of cut is improved greatly with eddy current dampers.

Download Full-text