Key words: valve submersible electric motor, viscous friction losses, rotor-stator clearance, friction torque, power losses, the Taylor flow.
Currently valve submersible electric motors find more and more application in oil recovery by vane pumps. Their advantages over traditionally used asynchronous electric motors are as follows: higher efficiency, greater range of shaft speed, higher reliability. One of the design features of the valve electric motors is the possibility of increasing the rotor – stator clearance, as it can be increased while maintaining the original strength of the magnetic field due to changes in the magnets radial thickness.
Typically at electric motors calculating the empirical relationships are used, which taking into account the total mechanical losses as viscous friction in the rotor – stator clearance, and friction in the bearings. These relationships are obtained by bench testing samples of already existing electric motors. It is clear that at the design of new products these relationships can't be used. Therefore, at designing new submersible electric motors another approach is required, allowing to calculate the losses based on the supposed construction.
In this paper we propose a method of numerical calculation of viscous friction losses in the rotor-stator clearance of valve submersible electric motors by means of computational fluid dynamics. The technique has been tested on three types of flows: laminar axial-symmetric, laminar Taylor and developed turbulent. The calculation of rotor – stator clearance effect on viscous losses for valve submersible electric motor PED63-117 in the frequency range from 3000 to 10000 min-1 was fulfilled. It is determined, that at frequencies up to 5000 min-1 viscous losses lead to inessential efficiency reduction (less than 0.5 %), but at high frequencies it reaches 5 %.
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