Design and analysis of a tubular linear oscillating motor for directly-driven EHA pump

Liang, Huisheng; Zhang, Jiao; Yan, Liang; Zhao, Longfei; Wu, Shuai; Li, Yang

doi:10.1016/j.sna.2014.01.026

Cited by 48 publications

(15 citation statements)

References 18 publications

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“…This actuator consists of two linear resonant motors, a linear pump, a hydraulic cylinder, an accumulator, several valves, and sensors. The employed linear resonant motors were designed by Wang et al with a novel compound Halbach magnet array, and the flux and mover dynamics were analyzed and optimized [24][25][26]. The primary component of the actuator is the linear pump, which incorporates two pump units.…”

Section: Introductionmentioning

confidence: 99%

Design, Analysis, and Verification of an Electro- Hydrostatic Actuator for Distributed Actuation System

Zhang

Zimeng

2020

Sensors

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In order to provide a simplified and low-cost solution of the terminal for a distributed actuation system, this paper proposes an electro-hydrostatic actuator (EHA) based on the linear drive principle. The proposed actuator is directly driven by a linear pump with a collaborative rectification mechanism, whose performance relies on the collaboration of the internal two units. A pair of linear oscillating motors are employed to drive the two pump units respectively. The control of the actuator is based on the modulation of the oscillating amplitude, frequency, and phase difference of the two motors. The advantage of this actuator is that no more valve control is needed to rectify the linear pump besides the high efficiency of the direct pump drive. In this paper, both schematic and detailed structure of the actuator is presented. The kinematic and dynamic characteristics are analyzed and modeled, based on which the control method is proposed. The experiments verify the validity of the actuator structure and control.

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Section: Introductionmentioning

confidence: 99%

Design, Analysis, and Verification of an Electro- Hydrostatic Actuator for Distributed Actuation System

Zhang

Zimeng

2020

Sensors

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“…The linear oscillating motor can achieve the oscillation motion of a relatively large amplitude and is considered as the driver of electro-hydrostatic systems. Liang et al [4] developed a tubular linear oscillating motor to use in the electro-hydrostatic system. Wang et al [5] optimized the linear oscillating motor, which achieved a high thrust and eliminated the eddy current effect.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Repetitive Control of A Linear Oscillating Motor under Periodic Hydraulic Step Load

Zhang

et al. 2020

Sensors

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A linear oscillating motor has a direct and efficient linear motion output and is widely used in linear actuation systems. The motor is often applied to compact hybrid electrohydraulic actuators to drive a linear pump. However, the periodic switch of the rectification valve in the pump brings the hydraulic step load to the linear motor, which causes periodic oscillation waveform distortions. The distortion results in the reduction of pumping capacity. The conventional feedback proportional-integral-derivative control is applied to the pump, however, this solution cannot handle the step load as well as resolving nonlinear properties and uncertainties. In this paper, we introduce a nonlinear model to identify periodic hydraulic load. Then, the loads are broken up into a set of simple terms by Fourier series approximation. The uncertain terms and other modeling uncertainties are estimated and compensated by the practical adaptive controller. A robust control term is also developed to handle uncertain nonlinearities. The controller overcame drawbacks of conventional repetitive controllers, such as heavy memory requirements and noise sensitivity. The controller can achieve a prescribed final tracking accuracy under periodic hydraulic load via Lyapunov analysis. Finally, experimental results on the linear oscillating motor-pump are provided for validation of the effectiveness of the scheme.

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“…Actually, linear motors have vital and typical applications on machine tool slid tables, recorders and free piston engines. Since 1999, LOMs especially LOMs have been vitally and extensively applied to air compressors, pumps, electromagnetic valves, active shock absorbers, vibrators and earphones [3][4][5][6][7]. The application of LOMs to the LEHA, a kind of hydraulic pump controlled actuator, leads to consequence of good reliability, high power density and convenient maintenance, which requires excellent dynamic displacement output with external load force and large force output.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Novel Linear Oscillating Loading System

et al. 2019

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Although linear motor has vital and potential applications in air compressors, hydraulic pumps, earphones and electric vehicles because of its good reliability, high power density and convenient maintenance, most researchers rarely concentrate on the dynamic performance of the linear oscillating motor with external force loads. It is essential to study the dynamic performance of the linear oscillating motor with accurate and multi-mode force loads. In this paper, a novel linear oscillating loading system is proposed and the loading system structure is depicted. Then, a mathematical model is built to match the simulation analyses of the dynamic performance of the linear oscillating motor with multi-mode external force loads. Moreover, the linear oscillating loading system platform is built and experiments are undertaken to verify the simulation analyses about the dynamic performance and efficiency with respect to different external force loads, and the simulation and experimental results show good agreement and will have promising significance for linear oscillating motor research and applications.

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Design and analysis of a tubular linear oscillating motor for directly-driven EHA pump

Cited by 48 publications

References 18 publications

Design, Analysis, and Verification of an Electro- Hydrostatic Actuator for Distributed Actuation System

Design, Analysis, and Verification of an Electro- Hydrostatic Actuator for Distributed Actuation System

Adaptive Repetitive Control of A Linear Oscillating Motor under Periodic Hydraulic Step Load

Design and Analysis of Novel Linear Oscillating Loading System

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