ABSTRACT:

Electric power transmission from the floating level base to a mining machine may be considerably influenced by use of semiconductor converters. Therefore mathematical models of different types of electric power transmission using converters were designed and investigated. Converters allow using of electric motors and actuators for traction and technological drives. Electric power transmission using DC current shows to be most favorable. DC transmission has substantial reduced transmission losses in the cable and besides that it brings simplification of cable arrangement and reduction of the cable cross-section.

INTRODUCTION

Intensive preparations for mining and exploitation of polymetallic nodules from the ocean bed are progressively made in the last years. Therefore new systems and devices are designed for the prospecting of polymetallic nodules on the deep seabed and their mining for practical use. Typical mining systems consist of floating level base, one or more mining machines and a number of navigation devices. Mentioned mining machine is proposed as a self-propelled vehicle applicable for the operation in mild sediments. Collection of polymetallic nodules from 20 to 100 mm can be realized by the mechanical or hydraulic way. Mined material can be transported up to the sea level repository by pumps, lift or airlift. Electric power can be supplied to the mining machine by a special cable from the floating level base. Some fiber optic lines for control and information signal transmission will complete the cable. The cable body is furnished with steel wire cover for its surface protection, tenacity and mechanical ruggedness advance namely during aggregate launching and lifting. Mining machine power devices are intended for traction and technological drives and for control system. Mentioned device design and its operation conditions depend on the power supply type of the mining machine.

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