Innovative Design and Simulation of a Downhole Turbine Generator for the Rotary Steerable System

In order to solve the problem of generator output voltage instability caused by mud flow instability, the electromagnetic damping generator (EDG) with stable output voltage is innovatively designed, and the contradiction matrix based on TRIZ theory. According to the invention principle "23 feedback" corresponding to "9 Speed" and "31 Harmful factors produced by objects", the structure scheme of EDG is proposed by coaxial assembly of generator and eddy current retarder (ECR). According to the technical index, the generator part is calculated theoretically. The accuracy of theoretical calculation and the feasibility of innovative design are verified by Finite Element Method (FEM). The output voltage and power generation efficiency of the generator and the braking torque of the ECR are calculated by FEM. The innovative EDG can adjust 40 V voltage to meet the design requirements.