Numerical simulation of 3D temperature field for the stator of a synchronous machine

In order to ensure that the stator ventilation system of a synchronous machine is reasonable, the temperature field of the stator was studied. The 3D model of the ventilation system was established including stator end winding, iron core and air-gap. The 3D turbulence and heat transfer mathematic model was appropriately selected, and then the corresponding boundary conditions and assumptions were given for the computation domain. Governing equations were numerically calculated by using the Computational Fluid Dynamics (CFD) software. For prototype and optimize structure with less bindings, the 3D temperature distribution was obtained for the stator components of initiating and optimize structures in two different rated rotational speeds. Temperature distribution characteristic of the components including the stator end windings, iron core, and pressure plate were analyzed. The results show that the highest temperature of stator is inside the end winding. After the bindings of winding are reduced and cushion blocks are minimized, temperature of stator iron core and windings is under the class of insulation temperature.