Numerical Simulation Analysis Of Multiphysics Field Coupling Of High Speed And High Pressure Axial Piston Hydraulic Motor Pump

The high-speed high-pressure axial piston hydraulic motor pump is a hydraulic pump that combines the traditional hydraulic pump and the motor into one,eliminating the intermediate coupling and directly forming the two parts through the structural design.The use of such a structure can improve the transmission efficiency of the motor to the hydraulic pump to a certain extent,and has the advantages of compact structure,large power density ratio,small vibration and noise.For high-speed high-pressure axial piston hydraulic motor pumps,because of their high-speed and high-pressure operation,the internal heat generated by magnetic and liquid coupling will have a huge impact on the operation of the pump.In order to avoid such a situation,a side flow passage for cooling is machined on the outer casing of the motor pump,and the motor pump is cooled by hydraulic oil flowing inside.This paper mainly analyzes the key factors of the coupling of magnetic field,flow field and temperature field in the motor pump,including the determination of basic structure style;the simulation calculation of the magnetic field of the motor;the coupling analysis of magnetic and liquid fields;the optimization of internal structure and the integration of multiphysics Analysis of the form of expression.The main research contents in this paper are as follows:(1)According to the requirements of working conditions,select the type of motor that meets the requirements;compare the different materials and design types to determine the basic structure of the motor pump.(2)Using the electromagnetic module in Ansys Workbench software to design and calculate the motor part of the motor pump,and obtain the basic parameters of the motor model in accordance with the process parameters and carry out three-dimensional modeling;simulate the calculation of the running state of the motor to verify whether it meets the working conditions.The basic structural dimensions are determined after the parameters;the magnetic field portion of the motor is simulated and the raw data is provided for subsequent magnetic and liquid field coupling.(3)Based on the previous part,the basic size of the motor pump is determined and the internal flow field pattern is designed.The preliminary simulation results are obtained by combining the magnetic field and the magnetic and liquid coupling fields in the pump.The internal temperature field distribution of different kinds of flow channels is analyzed.Based on the impact,the internal runner pattern is optimized and the optimal form is obtained by orthogonal experiment.(4)Analyze and describe the representation of multi-physics coupling according to the existing data,and determine the medium of its interaction;take the operating state of the motor,the magnetic field distribution of the oil gap,and the internal temperature field distribution as indicators to optimize the results before and after.The key factors affecting the interaction between complex multiphysics are analyzed.