泵用直驱永磁同步电机连续运行温升的原因分析.pdfVIP

32·山东水利2025.2

泵用直驱永磁同步电机连续运行温升的原因分析

姜延国1,李典基1,黄雪梅2

（1.南水北调东线山东干线有限责任公司，山东济南2501002.济南市水文中心，山东济南250014）

【摘要】南水北调东线某泵站采用的大型贯流泵低速直驱永磁同步电动机为水利行业首次应用，在长时间的运行

过程中发现，电机连续运行时会出现机组温度升高、电流增大、损耗增加、效率下降等现象。本文分析了该泵站机组电

机永磁体产生可逆退磁的原因，并通过现场实验法对永磁体在连续运行中出现的可逆退磁进行验证，同时从电磁设

计、变频器供电和机组冷却三个方面给出了对应的措施，为后续相关大型永磁同步电机的制造和维护提供了经验。

【关键词】永磁同步电机；永磁体；可逆退磁；涡流损耗；电机温升

【中图分类号】TV675【文献标志码】A

AnalysisontheTemperatureRiseCausesinContinuous

OperationofDirectDrivePermanentMagnetSynchronousMotor

JIANGYanguo,LIDianji,HUANGXuemei?

(1.ShandongMainLineCo.,LTD.,EastLineofSouth-to-NorthWaterDiversionProject,Jinan,Shandong250109,China;

2.HydrologyCenterofJinanMunicipality,Jinan,Shandong250014,China)

Abstract:Thelarge-scalecross-flowpumplow-speeddirectdrivepermanentmagnetsynchronousmotorusedina

pumpstationoftheeastlineofSouth-to-NorthWaterDiversionProjectisthefirstapplicationinthewaterindustry.

Duringthelongoperation,itisfoundthattheunittemperature,thecurrentandthelossincrease,whiletheefficiency

decreaseswhenthemotorrunscontinuously.Inthispaper,thecauseofreversibledemagnetizationofpermanentmagnet

oftheunitmotorinthispumpingstationisanalyzed,andthereversibledemagnetizationofpermanentmagnetin

continuousoperationisverifiedbyfieldexperiments.Atthesametime,thecorrespondingmeasuresaregivenfromthe

aspectsofelectromagneticdesign,inverterpowersupplyandunitcooling,whichprovidesexperienceforthesubsequent

manufactureandmaintenanceoflargepermanentmagnetsynchronousmotors.

Keywords:Permanentmagnetsynchronousmotor;Permanentmagnet;Reversibledemagnetization;Eddycurrentloss;

Machinetemperaturerise

1基本概况