JUSTIFICATION OF THE USE OF SYNCHRO-NOUS MOTORS WITH PERMANENT MAGNETS FOR A MACHINE WITH DOUBLE DRILL STRING

Abstract

The article is devoted to the rationale for the use of permanent magnet synchronous motors (PMSM) for a rig with a double drill string, which allows to provide an absolutely rigid mechanical characteristic in a wide range of speed control, regardless of the changing load on the drilling tool. PMSM is a very promising electric machine for low and medium power drives, especially for specialized drilling equipment. As a means of drilling, a double drill string is adopted, in which the entire load on the bottomhole is transmitted through the inner drill string installed in bearing supports relative to the outer pipe. In the course of previous studies, it was found that the loads on the rotation drive of the inner string practically did not change with the depth of the well, but depended only on the nature of the interaction of the tool with the rock.