TUBULAR LINEAR OSCILLATORY MACHINE FOR DRILLING APPLICATIONS

Abstract

Tubular linear permanent magnet oscillatory machine is presented in this paper. It can transfer electric power to rock directly without any mechanical media. Based on equivalent model of the machine, mathematical model considering frictions is built by analyzing the forces for both piston and casing. The frequency of input voltage is given according to linearization of mathematical model. The different operating modes are defined on the basis of displacement of casing. Dynamics analysis is done by supplying sinusoidal voltage. Simulation results show that the machine can output all kinetic energy to rock during collision instant and it will be a good option for drilling application.