Optimization Design Of Cam-Rotor Hydrulic Servo Motor

Cam Rotor Hydraulic servo motor is a kind of an implementation component in a hydraulic system,which is able to transform the oil potential energy into mechanical energy.As the motor is regarded as a key component in a hydraulic system,its property can directly determine the performance of hydraulic systems.Cam rotor blade motor has some advantages that other hydraulic motors does not have,including small size,low inertia,action sensitive.So the design for the cam rotor blade motor is put forward a very high demand.In this paper,the optimization design of the motor is carried out based on the theory of cam rotor blade motor,in which the related theory and key technologies are researched and analyzed.Firstly,the structure of the motor is introduced,and then its working principle is analyzed.The expression of disturbing torque under different vane end face structures is obtained.The results show that the vane end face structure with the appropriate fillet radius can effectively improve the disturbance torque of the motor.The relationship between the maximum disturbance torque and the cam rotor transition curve is obtained by the force analysis.The expression of the flow pulsation rate is obtained by analyzing the volume change of the oil chamber.The expression of the relationship between the leakage flow and the center angle of the motor is obtained.The theoretical basis of the optimal design of the cam angle of the cam transition curve is obtained by analytical analysis.Then,the factors that affect the efficiency of the motor are qualitatively analyzed.The expression of friction torque and the formula of motor leakage are deduced.Through simulation analysis,the motor optimization scheme based on efficiency design is determined.In addition,the temperature rise of the friction pair in the motor is analyzed,in which local temperature rise due to leakage and friction must be taken into account.Excessive temperature can damage the hydraulic fluid and reduce its performance.Based on the leakage and friction characteristics,the expression of temperature rise between the friction pairs in the motor is deduced,and the simulation analysis is carried out,and finally the theoretical basis of the motor optimal design is obtained.Besides,the transfer function of the cam rotor blade motor system is deduced and the mathematical model is established.The friction has a great impact on servo characteristics of cam rotor blade motor just as other general hydraulic motors,so the friction compensation is an indispensable part.Based on the LuGre friction model,the parameters of the friction model are identified,and the compensation strategy is proposed and the motor is compensated in the experiments.At last,the experimental platform of cam rotor blade motor is introduced and the experimental analysis of the motor is carried out.And multiple sets of experiments are performed in order to verify the correctness of the theoretical analysis.