摘要
针对矿井作业环境中受限的井下空间条件,传统电机冷却系统面临显著技术挑战。受限于作业空间约束,电机散热主要依赖风机强制通风,而自然对流散热效能因空间闭塞严重受限,导致电机内部热量易积聚并形成温度梯度。同时,为满足防爆安全规范设计的密闭式厚重外壳结构,虽增强了设备安全性,却进一步增大了热传导路径的热阻效应,形成热管理性能与防爆防护需求之间的矛盾。针对这一技术矛盾,本研究以高效永磁电机为研究对象,通过构建多物理场耦合的热场仿真模型,量化分析电机在不同工况下的温升分布特性,重点研究定子绕组、永磁体等关键部件的温升情况。在此基础上,创新性地提出防爆外壳的拓扑优化设计方案,通过有限元分析应力分布情况,形成“散热-防爆”协同设计策略。最终通过验证,为井下特种电机设计提供理论支撑和技术路径。
In the mining environment with the limited underground space conditions,the traditional motor cooling system faces the significant technical challenges.Due to the constraints of the working space,the motor is mainly cooled through the forced ventilation of fans.However,the cooling efficiency of natural convection is severely limited due to the closed space,which easily results in the accumulation of heat inside the motor and the formation of temperature gradients.At the same time,the sealed thick shell structure of meeting the explosion-proof safety specifications enhances the equipment safety,but further increases the thermal resistance effect of the heat conduction path,which creates a contradiction between the thermal management performance and the explosion-proof protection requirements.In order to address this technical contradiction,this study takes the high-efficiency permanent-magnet motor as the research object to quantitatively analyze the temperature-rise distribution characteristics of the motor under different working conditions by building a thermal-field simulation model of coupling multi-physics field,and chiefly researches on the temperature rise of key components such as stator windings and permanent magnets.Based on this,this paper innovatively proposes a topological optimization design scheme for the explosion-proof shell,analyzes the stress distribution condition by finite-element method,and forms a design strategy of collaborating"heat dissipation and explosion protection".Finally,it provides a theoretical support and technical paths for the design of special motors in underground environments based on the verification.
作者
许杰
Xu Jie(Wuxi Branch of Jiamusi Explosion-Proof Electric Machine Institute Co.,Ltd.,Wuxi 214100,China)
出处
《防爆电机》
2025年第4期100-103,116,共5页
Explosion-proof Electric Machine
关键词
防爆电机
永磁电机
防爆结构
温度场
Explosionproof motor
permanent-magnet motor
explosionproof structure
temperature field
