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Analysis and optimization of Ironless permanent magnet linear motor for improving thrust

机译:用于改善推力的无铁永磁线性电动机的分析与优化

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As is known, improving launcher thrust is the target that the mankind is pursuing. There is no saturation phenomenon in the Ironless permanent magnet linear motor(IPMLM), so the thrust of IPMLM has a linear relationship with current through windings to provide larger thrust. The topology of IPMLM determines thrust fluctuation is smaller than Iron-PMLM. In this paper, the model of airgap magnetic field is established by magnetic charge method and image method for global optimization of IPMLM thrust. All dimensions of IPMLM are described by motor thickness and three ratio coefficients(α, β and γ). The cooling power of cooling system under different temperature gradients, which determines current density of winding, is calculated by Comsol software. When α, β and γ are different means each dimension of IPMLM is different, the current density in different winding could be determined by constraint condition, pcu ≤ Q. So we can obtain the surface of current density and dimension, and the surface of thrust and dimension. For obtaining maximum thrust in the same volume, the size ratio among magnetic structure, winding structure and cooling structure is derived by the thrust analytical expression. The distribution of IPMLM thermal field is analyzed by 3-D finite element method, and this optimization method of IPMLM thrust density is proved by experiment.
机译:众所周知,改善发射器推力是人类正在追求的目标。无铁永磁线性电机(IPMLM)中没有饱和现象,因此IPMLM的推力与通过绕组的电流具有线性关系,以提供更大的推力。 IPMLM的拓扑确定推力波动小于Iron-PMLM。本文采用IPMLM推力全局优化的磁电荷法和图像方法建立了气块磁场模型。电机厚度和三个比率系数(α,β和γ)描述了IPMLM的所有尺寸。通过COMSOL软件计算不同温度梯度在不同温度梯度下的冷却系统的冷却功能由COMSOL软件计算。当α,β和γ不同意味着IPMLM的每个尺寸都不同,不同绕组中的电流密度可以通过约束条件确定,PCU≤Q.因此我们可以获得电流密度和尺寸的表面,以及推力的表面和维度。为了获得相同体积的最大推力,通过推力分析表达导出磁性结构,绕组结构和冷却结构之间的尺寸比。通过3-D有限元方法分析IPMLM热场的分布,通过实验证明了这种IPMLM推力密度的这种优化方法。

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