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Using the fluid computational method (CFD) and No. 40 hydraulic oil as working medium, the paper simulates and analyzes the valve plate of axial piston motor of hydraulic excavator, and optimizes its structure to obtain a low noise valve plate structure, it provides a reference for the design of the valve plate of axial piston motor.

AC dynamometer is one of the important performance testing and testing equipment in the process of motor manufacturing and product development. It is used to simulate and control the load of the motor in order to measure the performance parameters of the motor. In this paper, AC power dynamometer module of MTR Traction Motor Comprehensive Intelligent Test System is studied. The AC power dynamometer module is composed of a test motor and a four-quadrant frequency conversion device. The AC power dynamometer is adjusted by a four-quadrant frequency conversion device, and it can work in four quadrants to provide a test load for the test motor.

The automatic resistance tester selects STC89C52 as the core control chip, realizes the measurement of the resistance or potentiometer by voltammetry, then performs A/D conversion on the voltage value measured to represent the resistance value, and finally converts the digital signal completed by AD7705. Input the I/O port of STC89C52 MCU for calculation and processing, realize automatic measurement of resistance, automatic shifting and resistance screening function. At the same time, the function of the potentiometer resistance curve test can be completed. The experiment shows that the relative error of the resistance measurement based on STC89C52 automatic resistance tester is