Electromagnetic Design and Control Strategy of an Axially Magnetized Permanent-Magnet Linear Alternator for Free-Piston Stirling Engines

Zheng, Ping; Tong, Chengde; Bai, Jingang; Yu, Bin; Sui, Yi; Shi, Weichao

doi:10.1109/tia.2012.2226858

Cited by 46 publications

(21 citation statements)

References 22 publications

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“…Zheng [11] proposed a 1 kW moving-magnet linear motor for the FPEG application. The power densities, thrust fluctuation, and thermal field of the linear motor were investigated, but the electromagnetic efficiency of the linear motor was not reported in the paper.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Loss Analysis of a Linear Motor System Designed for a Free-Piston Engine Generator

Yang

et al. 2020

Electronics

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A free-piston engine generator is a new type of power generating device, which has the advantages of high efficiency and simple structure. In this paper, a linear motor system composed of a moving-coil linear motor with axial magnetized magnets and a H-bridge pulse-width modulation (PWM) rectifier is designed for portable free-piston engine generators. Based on the finite-element model of the motor and physical model of the rectifier, the combined electromagnetic model is presented and then validated by the prototype-tested results. The electromagnetic processes of the linear motor system are simulated. The electromagnetic losses during the standard working cycle are analyzed. Under the rated reciprocating frequency of 50 Hz and the rated reciprocating stroke of 36 mm, the mechanical-to-electrical energy conversion efficiency of 86.3% can be obtained by the linear motor system, which meets the requirement of portable free-piston engine generators.Electronics 2020, 9, 621 2 of 11 mover assembly moves down from the TTC to BTC driving by the combustion pressure.During the stable running, the linear motor works in generating mode all the time. The electromotive force (EMF) in the coil of the motor is quasi-sine wave, and the generating current in the coil is controlled as standard sine wave by the rectifier, and the electrical energy will be stored in the battery in the form of direct current. During the starting of the device, the linear motor must work briefly in motoring mode to start the motion of the piston-mover assembly.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic Loss Analysis of a Linear Motor System Designed for a Free-Piston Engine Generator

Yang

et al. 2020

Electronics

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“…Of particular interest is the implementation of these machines in systems dedicated to energy harvesting [1], [2], automotive industry [3]- [5], space applications [6], [7], manufacturing process [8], health care [9], and so on.…”

Section: Introductionmentioning

confidence: 99%

Feature Investigation of a T-LPMSM Following the Selection of Its Slot-Pole Combination

Souissi

Abdennadher

Masmoudi

et al. 2017

IEEE Trans. on Ind. Applicat.

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This paper investigates the no-load and the on-load behaviour of a fractional-slot tubular-linear permanent magnet synchronous machine (T-LPMSM). The study is initiated by the selection of the machine slot-pole combination. To do so, a formulation of the air gap flux density, based on the solution of the magnetic potential vector equation in the air gap and in the PM regions, is derived. The electromagnetic model allows the prediction of the phase back-EMFs and of the cogging force. The effect of the slot-pole combination on these features is then considered to the aim of the optimal selection of the slot per pole and per phase. A case study considering the optimized slot per pole and per phase number is treated where the analyticallypredicted no-load features are validated by finite element analysis (FEA). The investigation is extended to the on-load characteristic which is predicted by FEA and is validated by experiments. Index Terms-fractional-slot tubular linear PM synchronous machines; air gap flux density distribution; no-load features; onload features; finite element analysis; experimental validation. 0093-9994 (c)

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“…With the benefits of simple structure and easy realization, currentstroke and current-voltage double closed-loop control strategies [19][20][21][22] are employed in traditional free-piston power generating system, which ignored the d-q axis current coupling problem. Current feedback decoupling control strategy is investigated to realize the d-q axis current full coupling of motor control system.…”

Section: Introductionmentioning

confidence: 99%

Research on Control Strategy of Free-Piston Stirling Power Generating System

et al. 2017

Self Cite

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Abstract:As a clean and fuel adaptive alternative power plant, the Stirling power generating system has drawn attention of experts and scholars in the energy field. In practical application, the instability of free-piston Stirling power generating system caused by abrupt load change is an inevitable problem. Thus, methods to improve the output frequency response and stability of the free-piston Stirling power generating system are necessary. The model of free-piston Stirling power generating system is built by isothermal analysis firstly, and the initial control strategy based on given voltage system is put forward. To further improve the performance of power system, a current feedback decoupling control strategy is proposed, and the mathematical model is established. The influence of full decoupled quadrature-direct (d-q) axis currents is analyzed with respect to the output voltage adjusting time and fluctuation amplitude under the variations of piston displacement and output load. The simulation results show that the system performance is significantly improved, but the dynamic regulation lags caused by the decoupled current control still exist. To solve this problem and improve the performance of decoupled-state feedback current control that relies on parameter accuracy, internal model control based on sliding mode (IMC-SM) current decoupling control strategy is proposed, the system model is established, and then the performance of voltage ripple in generating mode is improved. Finally, the test bench is built, and the steady state and transient voltage control performances are tested. The feasibility and priority of the control strategy is verified by experiment and simulation results.

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Electromagnetic Design and Control Strategy of an Axially Magnetized Permanent-Magnet Linear Alternator for Free-Piston Stirling Engines

Cited by 46 publications

References 22 publications

Electromagnetic Loss Analysis of a Linear Motor System Designed for a Free-Piston Engine Generator

Electromagnetic Loss Analysis of a Linear Motor System Designed for a Free-Piston Engine Generator

Feature Investigation of a T-LPMSM Following the Selection of Its Slot-Pole Combination

Research on Control Strategy of Free-Piston Stirling Power Generating System

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