A Tubular PM Linear Generator With a Coreless Moving-Coil for Free-Piston Engines

Yang, Lijie; Xu, Zhaoping; Liu, Liang; Liu, Nianpeng; Yu, Houliang

doi:10.1109/tec.2019.2893069

Cited by 27 publications

(15 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 3 compares the main performance of the proposed PMMLG with that of two reported prototypes. As a type of moving-coil linear generator, MCLG [14] responds faster and has no cogging force. However, PMMLG as a movingmagnet linear generator has higher generating efficiency and power density.…”

Section: Transient Electromagnetic Analysismentioning

confidence: 99%

“…In the course of theoretical research, some scholars produced prototypes of linear generators and carried out experimental research. Yang [14] proposed a moving coil linear generator (MCLG) with the characteristics of low moving mass, fast response, high efficiency, and easy to control, but the power density of the MCLG is low. A tubular permanentmagnet linear machine (TMLM) was manufactured in [15], and back electromotive force (EMF) and thrust were taken as the main concerned aims.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Plate Moving-Magnet Linear Generator Designed for Free-Piston Engines

Sun

Liu

2020

IEEE Access

Self Cite

View full text Add to dashboard Cite

Free-piston engine coupled with linear generator is a research hotspot in the field of novel vehicle mounted power generation devices. A plate moving-magnet linear generator (PMMLG) is proposed and designed for free-piston engines in this paper. Magnetic circuit of the novel linear generator is analyzed and modeled in detail. The dimensions of a 2 kW prototype with the max stroke of 40 mm and the max electromagnetic force of 800 N is designed by using the derived magnetic circuit model. Static and transient electromagnetic field finite element models with motion solvers are created. Magnetic field distribution, electromagnetic force characteristics, EMF characteristics, coil inductance, generating power and losses of the linear generator are analyzed and compared with two reported prototypes. Computational fluid dynamics model of the PMMLG is established, and the temperature field is analyzed to verify that the air-cooling conditions can ensure long-term stable running of the linear generator without demagnetization. The research results show that the linear generator has the characteristics of low moving mass, low cogging force, high generating efficiency and high response speed. INDEX TERMS Linear generator, electromagnetic analysis, thermal analysis, free-piston.

show abstract

Section: Transient Electromagnetic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Plate Moving-Magnet Linear Generator Designed for Free-Piston Engines

Sun

Liu

2020

IEEE Access

Self Cite

View full text Add to dashboard Cite

show abstract

“…Table III compares the main parameters of proposed MMLG with the existed MCLG [12]. The main performance of MCLG is obtained by finite element simulation, and the accuracy of the simulation model is proved by experiments.…”

Section: Performance Analysismentioning

confidence: 99%

“…Yang et al . [12] proposed a moving coil generator for free‐piston engines. They concluded that the proposed moving coil linear generator (MCLG) has the characteristics of low moving mass, fast response, high efficiency and easy to control.…”

Section: Introductionmentioning

confidence: 99%

A Tubular Single‐Phase Linear Generator with an Axially Magnetized PM Mover for Free‐Piston Engines

Sun

Zhang

et al. 2020

IEEJ Transactions Elec Engng

Self Cite

View full text Add to dashboard Cite

A novel tubular single-phase linear generator with an axially magnetized permanent magnets (PM) mover is proposed in this paper for the application of free-piston engine, which is an alternative power generation system of next-generation electric vehicle. The transient 3D with motion electromagnetic field finite element model is created to analyze the EMF and thrust force characteristics of the linear generator. A 1.4 kW prototype with the max stroke of 40 mm and the max thrust force of 1670 N is developed, and main performances of the prototype are tested and validated with the finite element simulation. The prototype generating efficiency of 84 and 91% can be obtained respectively when driving by the 35 and 50 Hz sinusoidal reciprocation motion. Compared with the existed moving coil linear generator with similar generating efficiency, the mass power density and the volumetric power density of the new linear generator increase by about 37 and 80%, respectively.

show abstract

“…Compared with the traditional engine generator, the crankshaft is canceled, and the free-piston is directly connected to the mover of a linear motor. The piston-mover assembly is the only moving part of the device [4]. This structure has the advantages of compact, low mass, easy manufacture, and low maintenance cost.…”

Section: Introductionmentioning

confidence: 99%

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

Yang

et al. 2020

Electronics

Self Cite

View full text Add to dashboard Cite

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.

show abstract

A Tubular PM Linear Generator With a Coreless Moving-Coil for Free-Piston Engines

Cited by 27 publications

References 19 publications

A Plate Moving-Magnet Linear Generator Designed for Free-Piston Engines

A Plate Moving-Magnet Linear Generator Designed for Free-Piston Engines

A Tubular Single‐Phase Linear Generator with an Axially Magnetized PM Mover for Free‐Piston Engines

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

Contact Info

Product

Resources

About