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This paper presents variable voltage variable frequency (VVVF) control scheme to tubular linear permanent magnet synchronous machine (TLPMSM) with gas springs. To achieve constant drilling speed in the presence of different magnitudes of hardness of rocks, it is necessary to change the input voltage to the machine. Therefore, with change in input voltage, the natural frequency of the spring system...
Tubular linear permanent magnet machine with gas springs using for drilling applications is presented. This machine has the advantage of directly transmitting electric power to rock without gears. In this paper, mathematical model with hammering effect is established and dynamic process of oscillatory motion is analyzed. Simulation results show that this machine is suitable for drilling application.
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