| The submersible motor, as the power part for the submersible pump, is key to guarantee the normal operation of the machine set. So the quality and lifetime of the pump set are influenced directly by the performance of the submersible motor. Submersible motor works in thousands of meters oil well underground, so it need have high reliability. Many factors can influence the motor reliably running, but temperature rise caused by motor heating during running is main problem. Calculating in the temperature field is very important for the motor, it can make sure whether raising temperature meeting the requirements and motor reliably running. At the same time, the operator can choose suitable motors according to running temperature and heat removal surroundings under in the well. It can keep the temperature in some range during the motor normally running. And it's favorable to long running of the motor.At first, this article introduces the special structure characteristic of the submersible motor and special oil circulating system in air gaps. To calculate correctly the temperature distribution of the motor rotors, establishing one calculating model for stator and rotor global two-dimension electromagnetic field, adopted finite element method to calculate the values for the electromagnetic field, got each part loss as the calculating thermal source in the temperature field. Then the convective heat transfer coefficient between the lubrication oil in air gap of motor and rotor surface were got by the heat transfer and fluid mechanics theory. Finally, the three-dimension temperature distribution of a part of rotor can be calculated by the finite element method according to loss value and heat transfer coefficient on the surface, and then got the temperature distribution map for the each part.This article compare the calculating results with others method results, at the same time, test on line at site, It's accord with the facts, so the results can have some fact reference effect. |
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