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Feixue Chen
University of Chinese Academy of Sciences, Beijing 100049, China

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Review
Published: 13 April 2021 in Actuators
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In high-end testing and manufacturing equipment, a trend exists whereby the traditional servo feed system with a ball screw and rotary motor will gradually be replaced by a direct drive system. The precision motion system driven by a permanent magnet linear synchronous motor (PMLSM) offers several advantages, including high speed, high acceleration, and high positioning accuracy. However, the operating precision of the feed device will be affected by the PMLSM robustness to nonlinear and uncertain disturbances, such as cogging force, friction, thermal effects, residual vibration, and load disturbance. The aim of this paper was to provide a survey on disturbance analysis and suppression approaches to improve the dynamic performance of PMLSM motion systems. First, the origin and inhibition methods of thrust ripple and friction are presented. Second, the mechanisms, modeling approaches, and mitigation measures of thermal effects are introduced. Additionally, the residual vibration characteristics and suppression methods are discussed. Finally, disturbance observers of periodic and aperiodic loads are introduced. These suppression methods from structural design and control compensation are then discussed in order to improve the dynamic response and steady-state accuracy of PMLSM.

ACS Style

Xuezhen Wang; Feixue Chen; Renfeng Zhu; Xiaolu Huang; Na Sang; Guilin Yang; Chi Zhang. A Review on Disturbance Analysis and Suppression for Permanent Magnet Linear Synchronous Motor. Actuators 2021, 10, 77 .

AMA Style

Xuezhen Wang, Feixue Chen, Renfeng Zhu, Xiaolu Huang, Na Sang, Guilin Yang, Chi Zhang. A Review on Disturbance Analysis and Suppression for Permanent Magnet Linear Synchronous Motor. Actuators. 2021; 10 (4):77.

Chicago/Turabian Style

Xuezhen Wang; Feixue Chen; Renfeng Zhu; Xiaolu Huang; Na Sang; Guilin Yang; Chi Zhang. 2021. "A Review on Disturbance Analysis and Suppression for Permanent Magnet Linear Synchronous Motor." Actuators 10, no. 4: 77.

Review
Published: 20 August 2018 in Energies
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The Free-piston linear generator (FPLG) is a novel energy converter which can generate electrical energy and is regarded as a potential technology for solving the restriction of the short driving range of electric vehicles. Getting rid of the crank and flywheel mechanism, FPLG obtains some advantages of a variable compression ratio, compact size, and highly-efficient power generation. Linear electric machine (LEM) design and piston motion control are two key technologies of FPLG. However, they are currently the main obstacles to the favorable performance of FPLG. LEM being used to drive the piston motion or generate electric energy is an integrated design including a motor/generator. Various types of LEMs are investigated, and suitable application scenarios based on advantages and disadvantages are discussed. The FPLG’s controller is used to ensure stable operation and highly-efficient output. However, cycle-to-cycle variations of the combustion process and motor/generator switching make it difficult to improve the performance of the piston motion control. Comments on the advantages and disadvantages of different piston motion control methods are also given in this paper.

ACS Style

Xuezhen Wang; Feixue Chen; Renfeng Zhu; Guilin Yang; Chi Zhang. A Review of the Design and Control of Free-Piston Linear Generator. Energies 2018, 11, 2179 .

AMA Style

Xuezhen Wang, Feixue Chen, Renfeng Zhu, Guilin Yang, Chi Zhang. A Review of the Design and Control of Free-Piston Linear Generator. Energies. 2018; 11 (8):2179.

Chicago/Turabian Style

Xuezhen Wang; Feixue Chen; Renfeng Zhu; Guilin Yang; Chi Zhang. 2018. "A Review of the Design and Control of Free-Piston Linear Generator." Energies 11, no. 8: 2179.

Journal article
Published: 05 January 2018 in Energies
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This paper presents a control strategy to improve the output power for a single-cylinder two-stroke free-piston linear generator (FPLG). The comprehensive simulation model of this FPLG is established and the operation principle is introduced. The factors that affect the output power are analyzed theoretically. The characteristics of the piston motion are studied. Considering the different features of the piston motion respectively in acceleration and deceleration phases, a ladder-like electromagnetic force control strategy is proposed. According to the status of the linear electric machine, the reference profile of the electromagnetic force is divided into four ladder-like stages during one motion cycle. The piston motions, especially the dead center errors, are controlled by regulating the profile of the electromagnetic force. The feasibility and advantage of the proposed control strategy are verified through comparison analyses with two conventional control strategies via MatLab/Simulink. The results state that the proposed control strategy can improve the output power by around 7–10% with the same fuel cycle mass.

ACS Style

Chi Zhang; Feixue Chen; Long Li; Zhaoping Xu; Liang Liu; Guilin Yang; Hongyuan Lian; Yingzhong Tian. A Free-Piston Linear Generator Control Strategy for Improving Output Power. Energies 2018, 11, 135 .

AMA Style

Chi Zhang, Feixue Chen, Long Li, Zhaoping Xu, Liang Liu, Guilin Yang, Hongyuan Lian, Yingzhong Tian. A Free-Piston Linear Generator Control Strategy for Improving Output Power. Energies. 2018; 11 (1):135.

Chicago/Turabian Style

Chi Zhang; Feixue Chen; Long Li; Zhaoping Xu; Liang Liu; Guilin Yang; Hongyuan Lian; Yingzhong Tian. 2018. "A Free-Piston Linear Generator Control Strategy for Improving Output Power." Energies 11, no. 1: 135.