The Calculation of Three-dimension Temperature Field on Large Hydrogenerators Stator

This paper describes the calculation method of three-dimension temperature field in the stator of hydrogenerators.The calculation region is taken among the range of half of tooth length,half of slot width and half of stator coil length.On the basis of different air velocities in ventilation dusts,by determining heat transfer coefficients in different parts of iron core,effect of cooling system types on temperature rise is reflected truly.Taking Baishan electric machine as an example,temperature rise calculation was done,and comparison between calculation and test of the prototype was made.At the same time,temperature rise calculations in single-segment iron core and in half-of -axial-length region(25 segments) were done and compared.