Analysis Of Loss And Temperature Field Of Nuclear Canned Motor Pump

Canned motor pump has advantages completely leak-free, safe, reliable, lowmaintenance and low noise etc. However, due to the special structure, the metallic shieldedcan between stator and rotor lead to eddy loss and temperature rise. As the traditionalmethod to calculate the eddy loss, empirical formula has lots of restrictions and result inlarge deviations. Therefore, the empirical formula is not conductive to improve the motorand meet the project requirements. Temperature rise could make the can expansion, underthe constraint of the stator core and end cap, the thermal stress of the can would increasesignificantly, likely to cause the end solder destruction or can deformation cracking.Firstly, reviewed the development and application of canned motor pump,summarized the structure, operating principles and design features of the canned motor.The calculating formula of eddy loss and frictional loss of rotor are introduced. Calculatedthe performance for a2-pole8kW canned motor, and analysed the can’s influence on theperformance of the motor.Secondly, used finite element software ANSOFT to simulate eddy current in the canand get the impact of can parameter on the eddy current distribution. Produced four kindsof prototypes, and worked no load test. Combined with experimental data and comparisonsbetween different ways to calculate eddy loss, established the best method and summed upthe factors which impact the eddy current.Thirdly, combined simulation result and experimental data, made suitable simplifiedloss and heat transfer coefficient curves from start to stable state for finite element analysis.By using ANSYS software, get max temperature of various components of canned motor.Revealed the relationship of temperature between components in canned motor by analysethe temperature curves.Finally, imported the result get from temperature field calculation to stress field, andobtained distribution of thermal deformation and stress in stator can under start and stable state. By contrasting the stress, reach the conclusion which optimized selection of materialfor shielded can.