Calculation of Load Diagrams and Static Characteristics of Multimotor Electric Drive Systems using the Methods of Equivalent Forces and Reduced Moments

Abstract

This paper presents the calculations and construction of load diagrams and the static characteristics of individual mechanisms of a mining roadheader, which form a multimotor electric drive system, using the methods of equivalent forces and reduced moments. The productivity of the mine and the roadheader are calculated. The operating forces of idle and on-load mechanisms are calculated, and operation time intervals and a complete working cycle are determined. The load diagrams of mechanisms are constructed and their kinematic diagrams are designed. Based on the calculations performed, asynchronous motors with a short-circuit rotor, which have the closest power values and are suitable in terms of voltage and mode of operation, were selected from the catalogue. The gear reduction ratio is calculated, static resistance moments, and operation speeds to the motor shaft are specified. The static characteristics of the most powerful electric motor of a mining roadheader – or cutter – are formulated. The high accuracy of the calculations was confirmed by computer simulation, which showed minimum errors.

Keywords

• computer modeling
• electric motor
• equivalent force
• load diagram
• mine
• power calculation
• reduced moment
• roadheader
• static characteristics