Research on Downhole Synchronous Generator with End Magnetization and Voltage Stabilization Structure

Due to the variation of drilling fluid flow rate, the rotational speed of downhole turbine generator is unstable during operation, which can cause large fluctuations in output voltage. Therefore, this paper proposes an end-regulation and voltage stabilization structure for synchronous generators. According to the output voltage feedback, this end structure can stabilize the output voltage of the generator, which is to change the value of the end magnetic field by adjusting the current in the end regulating winding, and then change the magnitude of the magnetic flux with the turn chain of the stator winding. In the article, the composition and basic principle of the end regulator structure are analyzed, and the relationship between the end regulator structure and the generator output electromotive force is analyzed. Through three-dimensional simulation, the influence of the parameters of the end regulating structure on the generator operating characteristics is obtained.