Abstract
This paper examines methods to reduce the detent force and electromagnetic force in a short-stroke vibration tubular generator used to harvest energy from a vehicle suspension system but still achieve the design targets of power and power density. A well-known skewing permanent magnet approach and a novel approach named the unbalanced model (or moving teeth arrangement) were considered. A multi-objective optimization-based response surface method was also investigated. The results from 2D and 3D finite element analyses (FEA) revealed that when the permanent magnet array in the proposed machine was skewed by 45°, the detent force decreased by 13.1%. When parts of the slot were shifted by the same angle (45°), the unbalanced model could even reduce detent force by 32.7%. However, output power and power density also decreased accordingly. Among these approaches, multi-objective optimization, which can find the trade-off between various physical responses, seemed to be the best solution. A prototype based on an optimal design was fabricated, tested and its behavior was in excellent agreement with the FEA.
Highlights
Since 2004, the number of papers on energy harvesting from vehicle suspension systems has dramatically increased [1,2]
Compared with conventional tubular machines designed for vehicle suspension systems, the maximum and average power density (0.311 and 0.087 W/cm3 ) from the 8-slot 8-pole model are superior
It intuitively shifting perceivable that of theregions detent force and electromagnetic are dramatically reduced byisincreasing lengths and electromagnetic force are dramatically reduced by increasing shifting lengths of regions1 1and and3.3
Summary
Since 2004, the number of papers on energy harvesting from vehicle suspension systems has dramatically increased [1,2]. In [6], Asadi et al proposed a coreless hybrid damper composed of axial PMs and iron pole When this electric generator is excited by an amplitude of 12.7 mm and frequency of 15 Hz, average output power is around 48.5 W, while maximum the highest rate of damping force is 284.5 N. Compared with conventional tubular machines designed for vehicle suspension systems, the maximum and average power density (0.311 and 0.087 W/cm3 ) from the 8-slot 8-pole model are superior. The main objective is to reduce the detent and maximum electromagnetic force of the tubular PM machine proposed in [4], while ensuring other performances still achieved their design targets. The skewing PM approach and unbalanced model can significantly reduce the detent force and electromagnetic force, the output power is decreased . To verify the validity of the FEM analysis, a prototype was fabricated and tested
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