scholarly journals Research on an Electromagnetic Actuator for Vibration Suppression and Energy Regeneration

Actuators ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 42 ◽  
Author(s):  
Wei Wei ◽  
Qiang Li ◽  
Fangchao Xu ◽  
Xiaoyou Zhang ◽  
Junjie Jin ◽  
...  
Keyword(s):  
Electromotive Force ◽  
Vibration Suppression ◽  
Fem Analysis ◽  
Electromagnetic Actuator ◽  
Energy Regeneration ◽  
Input Amplitude ◽  
Output Force ◽  
Position Controller ◽  
Magnetic Rings ◽  
Controlled Object

This paper proposes an electromagnetic actuator that concurrently realizes two working functions of vibration suppression and energy regeneration. The actuator consists of four permanent magnetic rings, three soft iron rings, three coils, and three springs. The design of the electromagnetic actuator is based on finite element method (FEM) analysis, and the prototype is based on this analysis. Based on the prototype, the characteristics of the electromagnetic actuator, which has an output force–current coefficient of 39.49 N/A, are explored. A control algorithm with a position controller and an acceleration controller are applied to the actuator. When an impulse excitation is input to the electromagnetic actuator, the acceleration of the controlled object decreases from 114.26 m/s2 to 3.14 m/s2 here. Moreover, when the sinusoidal excitation with a 3 mm amplitude and 5 Hz frequency is input to the electromagnetic actuator, the vibration amplitude of the controlled object is 0.045 mm, suppressed within 1.46% when compared with the input signal. The peak value of the regenerated electromotive force is 1.97 V here, and the actuator efficiency for regenerating energy is 11.59%. The experimental results with multiple frequencies and amplitudes also show that the amplitude of the controlled object can be suppressed within 5.5%, and that the ratio of the electromotive force (EMF) to the input amplitude is 0.13. The results indicate that this electromagnetic actuator can suppress vibrations effectively and regenerate energy from vibrations.

Research of vibration and crack propagation controls on an asymmetrical cracked rotor

2021 ◽  
pp. 107754632199822
Author(s):  
Jun Liu ◽  
Zhu Han ◽  
Rong Hu
Keyword(s):  
Crack Propagation ◽  
Vibration Suppression ◽  
Control Method ◽  
Element Model ◽  
Electromagnetic Actuator ◽  
Contact Method ◽  
Cracked Rotor ◽  
Mapping Model ◽  
Differential Control ◽  
Opening And Closing

To investigate vibration characteristics and delay crack propagations of an asymmetric cracked rotor, the 3D finite element model of the rotor system with a nonlinear contact method is established. Resonance characteristics of the asymmetrical rotor without a crack and within different locations of a crack are investigated systematically. Numerical results show that a crack affects vibration frequencies and the unstable region of the rotor. Meanwhile, an improved proportional integral differential control method with the electromagnetic actuator is used to accomplish the delay crack propagation and the vibration suppression. Based on the mapping model of opening and closing states of a crack, the effects of rotational speeds, an unbalance, and asymmetries of the rotor are discussed in detail. Experimental results show that vibrations and the breathing behavior of cracks in the rotor with the electromagnetic actuator can be suppressed, and the effectiveness of the proposed mapping model of opening and closing states of a crack is verified.

Vibration Suppression Using Electromagnetic Resonant Shunt Damper

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Tsuyoshi Inoue ◽  
Yukio Ishida ◽  
Masaki Sumi
Keyword(s):  
Optimal Design ◽  
Experimental Analysis ◽  
Vibration Suppression ◽  
Mechanical Energy ◽  
Voice Coil Motor ◽  
Electrical Energy ◽  
Electromagnetic Actuator ◽  
Resonant Shunt ◽  
Shunt Circuit

An electromagnetic actuator has the property to convert mechanical energy to electrical energy and vice versa. In this study, an electromagnetic resonant shunt damper, consisting of a voice coil motor with an electric resonant shunt circuit, is proposed. The optimal design of the shunt circuit is obtained theoretically for this electromagnetic resonant shunt damper. Furthermore, the effects of parameter errors of the elements of the electromagnetic resonant shunt damper are also investigated. The applicability of the theoretical findings for the proposed damper is justified by the experimental analysis.

Ferrofluids for Concurrent Vibration Absorption and Energy Harvesting

2013 ◽  
Author(s):  
Saad F. Alazemi ◽  
Mohammed F. Daqaq
Keyword(s):  
Energy Harvesting ◽  
Electromotive Force ◽  
Vibration Suppression ◽  
Orientational Order ◽  
Experimental Studies ◽  
Energy Transfer Mechanism ◽  
Magnetic Dipoles ◽  
Modal Frequency ◽  
Vibration Absorption ◽  
Resonant Interactions

This paper proposes a novel Tuned Magnetic Fluid Damper (TMFD) with energy harvesting capabilities to concurrently mitigate structural vibrations and harvest vibratory energy. The energy harvesting TMFD consists of a rectangular container carrying a magnetized ferrofluid and mounted on a vibrating structure. The ferrofluids geometric and material properties (height, surface area, magnetization) are tuned such the first modal frequency of the fluid column matches the first modal frequency of the structure. The one-to-one resonant interactions between the structure and the fluid column results in a direct energy transfer mechanism which mitigates the vibration of the structure by channeling energy to the ferrofluid. Consequently, the fluid undergoes a sloshing motion with large-amplitude surface waves that change the orientational order of the magnetic dipoles in the fluid. This creates a time-varying magnetic flux, which induces an electromotive force in a coil wound around the container. The electromotive force transforms a small part of the fluids kinetic energy into electricity by generating a current in the coil. Experimental studies performed on an actual TMFD prototype clearly demonstrate its vibration suppression potential and energy generation capabilities.

scholarly journals Investigation on MDOF Bilateral Teleoperation Control System Using Geared DC-Motor

2016 ◽  
Vol 10 (11) ◽  
pp. 54
Author(s):  
Jun Wei Lee ◽  
Zaki bin Hj Shukor Ahmad ◽  
Herman bin Jamaluddin Muhammad
Keyword(s):  
Control System ◽  
Degrees Of Freedom ◽  
Reaction Force ◽  
Dc Motor ◽  
Bilateral Teleoperation ◽  
Direct Drive ◽  
Bilateral Control ◽  
Linear Motors ◽  
Output Force ◽  
Position Controller

This paper presents the research on bilateral teleoperation control system of two link planar manipulator. The bilateral control system consists of master and slave system using geared DC-motor. Both master and slave manipulators are actuated by DC-Micromotor attached to planetary gearhead to increase the output torque. In the previous researches, the common used actuators were linear motors and direct drive DC motor. However, the application of DC motor with gearhead is vast in industry, due to the need for high output force or torque. Thus in this paper, a deeper research on bilateral teleoperation control system is proposed with implementation of gear into the DC-motor. The modelling of multi-degrees-of-freedom (MDOF) bilateral teleoperation control system is designed with the implementation of workspace observer (WOB), reaction force observer (RFOB), position controller and force controller. During the experiments, free motion and contact motion were conducted to validate the proposed setup in bilateral teleoperation control system. The position and torque responses of both master and slave manipulators were observed. The operationality and reproducibility of this proposed system were evaluated through experimental results. Ultimately, this paper focused on the performance of the proposed setup and is analysed by using reproducibility and operationality.

scholarly journals A Twisted String, Flexure Hinges Approach for Design of a Wearable Haptic Thimble

Actuators ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 211
Author(s):  
Daniele Leonardis ◽  
Luca Tiseni ◽  
Domenico Chiaradia ◽  
Antonio Frisoli
Keyword(s):  
Fem Analysis ◽  
Design Guidelines ◽  
Flexure Hinge ◽  
Output Force ◽  
Twisted String ◽  
Present Design ◽  
Measuring Frequency ◽  
Pulling Force ◽  
The Cost ◽  
Sense Of Touch

Wearable haptic devices in the shape of actuated thimbles are used to render the sense of touch in teleoperation and virtual reality scenarios. The design of similar devices has to comply with concurring requirements and constraints: lightweight and compactness, intensity and bandwidth of the rendered signals. Micro-sized motors require a mechanical reduction to increase the output force, at the cost of noise and vibrations introduced by conventional gear reducers. Here we propose a different actuation method, based on a miniaturized twisted string actuator and a flexure hinge transmission mechanism. The latter is required to transmit and transform the pulling force of the twist actuator to a pushing force of the plate in contact with the fingerpad. It achieves a lightweight and noiseless actuation in a compact mechanism. In this work, we present design guidelines of the proposed approach, optimization, and FEM analysis of the flexure hinge mechanism, implementation of the prototype, and experimental characterization of the twist actuator measuring frequency response and output force capabilities.

scholarly journals A modified energy-saving skyhook for active suspension based on a hybrid electromagnetic actuator

2018 ◽  
Vol 25 (2) ◽  
pp. 286-297 ◽  
Author(s):  
Renkai Ding ◽  
Ruochen Wang ◽  
Xiangpeng Meng ◽  
Long Chen
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Active Control ◽  
Dynamic Performance ◽  
Active Suspension ◽  
Linear Motor ◽  
Bench Test ◽  
Electromagnetic Actuator ◽  
Energy Regeneration ◽  
Hydraulic Damper

This study proposes a modified energy-saving skyhook consisting of active control, energy regeneration, and switch. The modified skyhook coordinates the contradiction between dynamic performance and energy consumption of electromagnetic active suspension. The control principle is analyzed, the switch condition between active control and energy recovery is provided, and the switch control system is designed for simulation. Results demonstrate that the presented strategy can coordinate the dynamic performance and energy consumption effectively. The realization structure, namely, a hybrid electromagnetic actuator, is then designed to satisfy the control requirements. It integrates a linear motor and a hydraulic damper. The linear motor is used for active control or energy regeneration, while the hydraulic damper is used to guarantee basic dynamic performance. The structural dimension of hybrid electromagnetic actuator is optimized to increase air gap flux density with the volume and weight limitation. A prototype is fabricated, and a bench test is conducted. Results show that the structure can satisfy the control requirements. Some errors within a reasonable range are also observed between the test and the simulation because the simulation model is prepared under ideal conditions.

scholarly journals Experimental verification of model-free active vibration control approach using virtually controlled object

2020 ◽  
Vol 26 (19-20) ◽  
pp. 1656-1667 ◽  
Author(s):  
Heisei Yonezawa ◽  
Itsuro Kajiwara ◽  
Ansei Yonezawa
Keyword(s):  
Vibration Suppression ◽  
Controller Design ◽  
Design Method ◽  
Active Vibration Control ◽  
Order System ◽  
Control Performance ◽  
Control Approach ◽  
Model Free ◽  
Active Vibration ◽  
Controlled Object

The purpose of this study is to develop a simple and practical controller design method without modeling controlled objects. In this technique, modeling of the controlled object is not necessary and a controller is designed with an actuator model, which includes a single-degree-of-freedom virtual structure inserted between the actuator and the controlled object. The parameters of the virtual structure are determined so that indirect active vibration suppression is effectively achieved by considering the frequency transfer function from the vibration response of the controlled object to that of the virtual structure. Since the actuator model, which includes a virtually controlled object, is a simple low-order system, a controller with high control performance can be designed by traditional model-based optimal control theory. In this research, a mixed [Formula: see text] controller is designed considering both control performance and robust stability. The effectiveness of the proposed method is validated experimentally. The robustness of the controller is demonstrated by applying the same controller to various structures.

scholarly journals A Method to Improve Torque Density in a Flux-Switching Permanent Magnet Machine

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5308
Author(s):  
Junshuai Cao ◽  
Xinhua Guo ◽  
Weinong Fu ◽  
Rongkun Wang ◽  
Yulong Liu ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Permanent Magnet ◽  
Electromotive Force ◽  
Fem Analysis ◽  
Torque Ripple ◽  
Electromagnetic Torque ◽  
Torque Density ◽  
Output Torque ◽  
Two Machines

With the continuous development of machines, various structures emerge endlessly. In this paper, a novel 6-stator-coils/17-rotor-teeth (6/17) E-shaped stator tooth flux switching permanent magnet (FSPM) machine is introduced, which has magnets added in the dummy slots of the stator teeth. This proposed machine is parametrically designed and then compared with the conventional 6/17 E-shaped stator tooth FSPM machine through finite element method (FEM) analysis. Then, combined with the results of FEM, the performance of two machines is evaluated, such as electromagnetic torque, efficiency, back electromotive force (back-EMF). The final results show that this novel 6/17 FSPM machine has greater output torque and smaller torque ripple.

scholarly journals Thrust Ripple Force Minimization and Efficiency Analysis of Electromagnetic Actuator on Active Suspension

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Kou Farong ◽  
Li Yangkang ◽  
Chen Chen ◽  
Hong Feng
Keyword(s):  
Fem Analysis ◽  
Active Suspension ◽  
Element Model ◽  
Slot Width ◽  
Force Characteristic ◽  
Electromagnetic Actuator ◽  
Maximum Output ◽  
Current Frequency ◽  
Energy Feedback ◽  
Output Efficiency

A novel electromagnetic actuator for active suspension is designed on an in-wheel motor electric vehicle in this paper. Aiming at reducing thrust ripple force and improving stability of the actuator, a method of calculating the optimum slot width and optimizing edge radian of end tooth is proposed. Firstly, a finite element model (FEM) of the actuator is modeled, and the correctness of FEM is verified through comparisons of simulation results and analytical ones, including counterelectromotive force of coil winding and force characteristic test of the actuator. Based on the FEM, the influence of slot width on electromagnetic thrust and total harmonic distortion (THD) is analyzed, and the slot width is improved. The side effect of the actuator is considered. By improving the edge radian, the fluctuation of the cogging force and thrust ripple is reduced. In addition, output efficiency and energy feed efficiency of the actuator after reducing thrust ripple are studied. The results show the minimum THD is 4.2%, which is obtained at the slot width 4.3 mm, and thrust ripple is 36.5 N. When the edge radian is 60°, the thrust ripple decreases to only 15.7 N, which is reduced by 57.0%. The maximum output efficiency and energy feedback efficiency of the actuator are 87.5% and 27.1%, respectively. Finally, according to actuator characteristic tests of two working modes, it is concluded that the maximum energy feedback efficiency is 25.6%. The input current and current frequency should be gradually increased with the increase of suspension speed under active mode, and the maximum output efficiency is 80.2%. The test results are basically consistent with the FEM analysis values, which verify the correctness of the FEM analysis.

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