Mathematical Modelling and Selecting the Parameters of Magnetic Circuit of Disk Torque Converter

Conceptual Control Method of Drilling Rig’s Torsional Vibrations Frequencies

“…The described electromagnetic drilling rig is a device that uses torsional vibrations in the rock drilling process, which are produced by an electromagnetic generator of torsional vibrations. The electromagnetic drilling rig consists of several main elements: the main drive motor (MDM) [2,6], the induction torque converter (ITC) [3][4][5][6][7], the torsional vibration generator (TG) [5,7], and elements such as a cutting head (DH) and an internal screw conveyor. Figure 2 shows, in a simplified way, the kinematic chain of the electromagnetic drilling rig.…”

“…The issues of modeling the components of the drilling rig were discussed in articles on the main drive motor [3,7], torsional vibration generator [2,5,6], and induction torque converter [4,6]. The publication presents the issues of modeling with the use of field techniques, but also formulates mathematical models in the form of systems of ordinary differential equations, which are convenient for simulation studies (e.g., involving various power supply methods).…”

“…The MDM motor drives the first inertial mass of the kinematic chain of the drilling rig with torque T 1 and it responds with angular displacement ϑ 1 and angular speed ω 1, respectively. The shaft speed increases and the angular speed ω e1 of the excitation circuit (secondary inertial mass of kinematic chain) of ITC [4,6] increases as well, which results in generating the electromagnetic torque T epm . That torque drives the third inertial mass, the receiving element of ITC, which rotates with the angular speed ω r2 .…”

“…That torque drives the third inertial mass, the receiving element of ITC, which rotates with the angular speed ω r2 . It is worth underlining that the excitation circuit and receiving circuit are coupled only in the electromagnetic way, there is no mechanical coupling [4,6]. The shaft between ITC and TG is rotating with the angular speed ω 2 and it influences the TG behavior.…”

“…The obtained results showing the acceleration process of drilling (presented in Figure 1 in Section 2) in laboratory tests initially confirmed the correctness of the concept of using torsional vibrations in the drilling process. In consequence, after the research had been finished, the idea of an innovative device was created [3][4][5]. The novel device can be a new tool used not only by mines rescue and incident management teams but also in other situations.…”