Study of radial and axial magnets for linear alternator — Free piston engine system

Slotless tubular PM generator with dual quasi‐Halbach magnetized PM Array: Analytical and numerical magnetic field analysis

“…8 Continuous operation of a Free Piston Expander (FPE) linear generator in a waste heat recovery application has presented in the study of Tian et al, 9 which the feasibility working of the presented FPE linear generator has been confirmed by obtained results. A finite element method (FEM) analysis of static thrust and magnetic flux density distribution for a 10 kW, LSG, which has an efficiency of 97% for an FPEG application is presented in the study of Yamanaka et al 10 Initial design and electromagnetic field analysis based on ANSYS Maxwell for a Tubular Linear Generator (TLG) with radial and axial PM in free piston engines is discussed in the study of Subramanian et al 11 In this study, flux density, Back-EMF of the proposed machine have investigated, and the obtained results showed that the machine with axial PM provides extra output power and efficiency in comparison with the machine with radial PM. A FEM-based static thrust and magnetic flux density distribution of a novel FPEG configuration, which is applicable for hybrid vehicles, is presented in the study of Yamanaka et al 12 In the previous studies, 13,14 an improved flux path Homopolar BLDC generator has been investigated in which PM is replaced by a direct current excited auxiliary field winding to control the main magnetic flux pass through the machine.…”

Development of Resonating Tubular Oscillating Linear Alternator and Engine; System Design and Modeling

“…Others have come to the same conclusions that axial magnetic fields outperform radial fields [12] [13]. The same has been studied concerning tubular linear machines and finding that output voltage, flux density, power, and efficiency is higher with axial magnetic fields [14].…”

Design, Modeling and Optimization of Reciprocating Tubular Permanent Magnet Linear Generators for Free Piston Engine Applications

“…• Axial arrangement, and Currently, there is research going on in utilizing axial and halbach arrangement in linear generators. Comparisons of axial and radial magnet arrangement in rotary and linear generators were discussed in [30,31,32,33,34]. It was found from these papers that the axial arrangement is better compared to the radial magnet arrangement in terms of power density and efficiency.…”

“…The moving magnet translator can be made of cylindrical or ring magnets. Axial magnets for PMLG are better than radial magnets as shown in [32]. Therefore, axial magnets are used for the study.…”