永磁同步电主轴的热态特性分析

Thermal Performance Analysis of Permanent Magnetism Synchronous Motorized Spindle

为深入探讨永磁同步电主轴内部传热和散热的机制,对其内置永磁电机和轴承产热进行了理论分析,并对主轴内部轴承和电机的发热进行定量计算。依据现代传热学的知识,确定了温度场的定解条件。在Ansys中对电主轴进行了热特性分析,通过热-结构耦合分析求解温度场对结构中应力应变和位移的影响。分析结果表明:电主轴内部各部件之间温差较大,轴承端与主轴前端温升严重,与定转子之间温差较大,主轴内部各部件的温升趋势基本相同。因此,提出了改善电主轴热特性的措施,如加强温升严重部位的散热和减小轴承发热等。

In order to deeply discuss the internal heat transfer and heat dissipation mechanism of permanent magnetism synchronous motorized spindle,the heat generation of its built-in permanent magnetism motor and bearing was theoretically analyzed,and the heat generation of the bearing and motor inside the spindle was quantitatively calculated.According to the knowledge of modern heat transfer,the definite solution condition of temperature field was determined.The thermal characteristics of the motorized spindle were analyzed in Ansys,and the influence of temperature field on the stress,strain and displacement of the structure was solved by thermal structural coupling analysis.The results indicate that there is a big temperature discrepancy in each component of motorized spindle,the temperature rise between the bearing end and the spindle front end is serious,and the temperature difference between stator and rotor is huge,and the temperature increase tendency of the interior components of the spindle is no distinction.Hence the steps to perfect the thermal characteristics of motorized spindle were put forward,such as strengthening the heat dissipation of the parts with severe temperature rise and reducing the heat generation of the bearing.