摘要
用Levenberg-Marquardt方法对异步电机定子绕组与铁心之间绝缘接触层的导热系数以及气隙内的对流换热表面传热系数进行了反问题计算,并对温度场进行了重建。通过对计算结果的分析研究,发现利用传热反问题的方法可以达到对电机内部参数和边界条件定量估计的目的。当测量结果比较准确时,计算结果和真实解非常接近。当测量存在较小误差时,计算结果仍能满足工程需要,两个参数的反问题计算对测量正误差的抗干扰性都很强。当测量误差达到0.2℃时,绝缘层导热系数的计算误差仅为3.36%,对流换热表面传热系数的计算误差也在10%左右。因此,在对异步电机定子绕组与铁心之间的绝缘接触层的导热系数和气隙内对流换热表面传热系数进行反问题计算时,应尽量避免测量负误差的出现。
The conduction coefficient of insulative layer between ring and stator of asynchronous motor and the convection coefficient within the gap between stator teeth and rotor were computed by L-M method. The 2D thermal fieild of stator was rebuilt by finite volume method. The inverse heat conduction problem analysis can estimate the parameter and boundary conditions of motor accurately. When measurements are precision, the calculation results are accurate. With little errors of measurements, the calculation results can satisfy engineering need. For plus errors, the anti-jamming of identification of the two parameters is much better. When measurement error reach 0.2℃, the computing error of conduction coefficient is only 3.36% and that of the covection coefficient is near 10%. When estimate parameteres of asynchronous motor based on inverse heat conduction problem analysis minus errors should be avoided.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2006年第22期151-156,共6页
Proceedings of the CSEE
关键词
异步电机
定子
温度场
导热反问题
传热
asynchronous motor
stator
thermal field
inverse heat conduction problem
heat transfer
