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为实现水泵、风机等离心式负载的高效转速调节与节能目标，同时解决传统永磁调速器在大功率工况下调节可靠性低、空间占用大的问题，设计开发了一种新型磁屏蔽式永磁调速(MS-PMASD)系统。通过在永磁转子(PMR)与导体转子(CR)之间增设高磁导率磁屏蔽环(MSR)，以磁屏蔽环轴向移动为核心调速机制，建立等效磁路(MEC)模型分析不同屏蔽距离下的气隙磁场、涡流密度及转矩特性，结合有限元分析(FEA)与大功率实验平台验证系统性能，并优化导体环电导率、外背铁磁导率等关键材料参数，分析磁屏蔽环位移、转速差对系统输出转矩、涡流损耗及轴向力的影响。结果表明：该系统仅通过磁屏蔽环轴向移动即可实现调速，无需调整电机与负载位置；当磁屏蔽环位移从0增至90 mm时，铜环峰值涡流密度从856降至338 A/cm2(仅为最大值的39%)，峰值输出转矩从2 160降至920 N·m，转矩-转速关系与理论曲线吻合度达90%；动态响应时间小于0.5 s，改进外背铁后可消除传统调速的转速骤降现象，在315 kW大功率负载工况下，调速稳定性与精度显著提升，且在线调节便捷，为离心式负载的节能调速提供了可靠技术方案。
Abstract：In order to achieve the goal of efficient speed regulation and energy saving for centrifugal loads such as pumps and fans, and solve the problems of low regulation reliability and large space occupation of traditional permanent magnet governor under high power conditions, a new magnetic shielded permanent adjustable speed drive(MSPMASD) system is designed and developed. A magnetic shield ring(MSR) with high permeability is added between permanent magnet rotor(PMR) and conductor rotor(CR). The axial movement of magnetic shield ring is taken as the core speed regulation mechanism. The equivalent magnetic circuit(MEC) model is established to analyze the air-gap magnetic field, eddy current density and torque characteristics under different shielding distances. Combined with finite element analysis(FEA) and high-power experimental platform, the system performance is verified, and the key material parameters such as conductivity of conductor ring and permeability of outer back iron are optimized. The influences of magnetic shield ring displacement and slip velocity on output torque, eddy current loss and axial force of the system are studied. The results show that when the displacement of the magnetic shield ring increases from 0 to 90 mm, the peak eddy current density of the copper ring decreases from 856 to 338 A/cm2(only 39% of the maximum value), the peak output torque decreases from 2 160 to 920 N·m, and the torque-speed characteristic agrees with the theoretical curve with a coincidence rate of up to 90%. The dynamic response time is less than 0.5 s. The improved outer back iron can eliminate the traditional speed drop phenomenon. Under a 315 kW high-power load, the speed control stability and accuracy are significantly improved, and online adjustment is convenient. This provides a reliable technical solution for the energy-saving speed regulation of centrifugal loads.
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基本信息:
中图分类号:TH132.46
引用信息:
[1]白华,靳海毅,柳志明.新型磁屏蔽式永磁调速器的设计与性能分析[J].天津工业大学学报().
基金信息:
国家自然科学基金项目（61201106）
2026-04-13
2026-04-13
2026-04-13