The numerical simulation analysis of key structures of integrated power supply in motor-pump

The motor-pump is an organic combination of hydraulic pump and driving motor. It isintegrated by means of optimum structure design and performance match. It has no shaft coupling and fixing bracket of pump which are parts of traditional driving mode. It has small capacity, low noise, high reliability and is convenient to fix, so it's a neotype of highlyintegrated power supply and will be a important direction of development in the field of electrichydraulic power supply. In this paper, we discuss different integration manners and control theories of motor-pump, inaugurate a scheme which integrates brushless DC servo motor and internal meshing gear pump based on the discussion above, and then introduce the overall structure and operating principle of our scheme. As the stator and rotor of the driving motor in motor-pump both work while dipped in hydraulic oil, this could cause interference to the running characteristic of the motor. Aim at the special structural style of motor-pump in this paper, we analyse some key structures of motor-pump as well as their effects on the whole capacity and efficiency, then we do the numerical simulation analysis by using the Fluent which is a software for liquid analyse and count, the AMESim which is a software for systematic engineering analyse, and also the relevant mathematic theories. In these numerical simulation analysis we work over the distribution of flow field between the stator and rotor of the motor in motor-pump, and also between the rotor and the excircle of internal gear pump. We also study the damping torque of the rotor, the design means of anomalous flow passage used for elimination of heat, and then give the relevant analysis results which provide train of thoughts and appropriate parameters for optimum design and efficiency advancement of the whole products. I confirm that I hold copyright on all of the original material included in my paper. I also confirm I have obtained permission, from the copyright holder of any third party material included in their paper, to publish it as part of my paper. I grant full permission for the publication and distribution of my paper as part of the ICAS2008 proceedings or as individual off-prints from the proceedings.