Analysis of cycloid motor output characteristics based on fluid simulation

In the field of drilling engineering, the rubber screw motor adopts the cycloidal principle for drilling, and the rubber bushing will carbonize and fail when the drilling at 180°C and above. As a positive displacement motor, the cycloidal motor has high temperature and corrosion resistance, low speed, and high torque. It is used in traditional mechanical engineering fields, such as the hydraulic cycloidal motor of the hoist, while the hydraulic cycloidal motor applied in the drilling fluid field has been blank. Therefore, the cycloidal motor in drilling fluid medium is proposed in this paper, which is different from the traditional mechanical cycloidal motor in oil medium and applied in the field of high-temperature drilling engineering. Based on the clearance flow theory and energy conservation law, the mathematical model of fluid leakage of the cycloidal motor was calculated. Through Matlab programming, the cloud diagram of fluid pressure drop, clearance, and viscosity on the leakage of the cycloidal motor was calculated numerically. The characteristic curve of motor numerical calculation was compared and verified by experimental data of the OMT 160 cycloidal motor produced by Danfoss Company. A theoretical basis for selecting clearance of machining and manufacturing all-metal cycloidal motor were provided.