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This paper presents a Down-The-Hole (DTH) hammer drilling system driven by a tubular reciprocating translational motion permanent magnet synchronous motor for offshore oil & gas industry. The mathematical models of electric part, mechanical part and load are presented based on force analysis of motor and dynamic analysis of impact. The simulation results validate the mathematic model and show...
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.
Tubular linear permanent magnet motor with gas springs using for drilling applications is presented in this paper. This motor has the advantage of directly transmitting electric power to rock without gears. Mathematical model with hammering effect is established and dynamic process of oscillatory motion is analyzed. Dynamic response comparison of no load mode and load mode is done. Simulation results...
A novel idea employing Tubular Linear Permanent Magnet Synchronous Motors (TLPMSM) with two gas springs is presented in this paper. The mathematical model of TLPMSM is developed for the aim of controlling the stroke length of TLPMSM for drilling application. The control strategy based on transfer function model is designed. The simulation result of the control system shows the validity of design of...
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