集成式天然气输送压缩机直驱永磁电机研究

Study on Directly-drived Permanent Magnet Motor for Integrated Natural Gas Transmission Compressor

集成式天然气输送压缩机采用高速兆瓦级永磁电机直驱替代传统电机+齿轮箱驱动压缩机模式,其驱动电机的电磁设计、机械设计、流体冷却设计均远超出常规电机技术范畴。建立了6MW、10000rpm永磁电机电磁有限元模型,对高压扁铜线绕组高频交流损耗性能进行分析;建立了高压天然气CFX流体模型进行转子碳纤维表面高速风磨耗评估,同时计算碳纤维表面粗糙度对风磨耗的影响;建立了整机1/4流固耦合模型对电机的温升分布规律进行分析;总结出基于电、磁、流体多物理场耦合的兆瓦级高速永磁电机综合设计与分析方法;为高速兆瓦级永磁电机在集成式天然气输送压缩机上应用提供了可靠的理论依据。

This paper presents a high-speed MW permanent magnet motor driving directly The integrated natural gas transmission compressor directly drived by high-speed megawatt-class has replaced the traditional compressor drive by induction motor plus gearbox. The electromagnetic, mechanical and fluid cooling designs of the motor are far beyond the conventional technology category. The electromagnetic finite element model of 6 MW 10000 rpm permanent magnet motor was established to analyze the high-frequency AC loss performance of high-voltage flat copper wire windings. The CFX fluid model of high-pressure gas was established to evaluate the high-speed friction loss on the surface of rotor carbon fiber, and the influence of the surface roughness of the carbon fiber on the friction loss was calculated. The 1/4 fluid-structure coupling model was established to analyze the distribution law of temperature rise of the whole motor. Based on the multi-physics coupling of electricity, magnetism and fluid, this paper summarizes the comprehensive design and analysis method of high-speed megawatt-class permanent magnet motor. It provides a reliable theoretical basis for the application of high-speed megawatt-class permanent magnet motor in integrated natural gas transmission compressor.