Abstract
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.
Highlights
A free-piston engine generator (FPEG) is a novel power generating device, which is a combination of a free-piston engine and a linear motor [1]
In order to analyze the electromagnetic loss of the designed pulse-width modulation (PWM) rectifier, its physical model is
118 W/kg magnets and an H-bridge PWM rectifier motor is designed for a portable free-piston engine generator
Summary
A free-piston engine generator (FPEG) is a novel power generating device, which is a combination of a free-piston engine and a linear motor [1]. Xu [9] proposed a single-phase moving-coil linear motor with radial magnetized magnets for the application of an FPEG, its analytical model was created, and its thrust force and the coil inductance were investigated This kind of single-phase moving coil linear motor has the advantage of less moving mass, faster response and better controllability, but the generating efficiency is not. This kind of single-phase moving coil linear motor has the advantage of less moving mass, faster response and better controllability, but the generating efficiency is not high enough as there is a high eddy loss in the radial magnetized magnets. The electromagnetic loss of the motor system is analyzed in detail
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