A Dynamic Dynamometer for Testing of Mining DC Motors

Abstract

This paper describes the development of a 2.2 MW DC electric machine based dynamometer for the cyclic testing of motors used in mining applications. The dynamometer, through the application of sophisticated control, is able to simulate the real dynamic digging conditions of an electric rope shovel. The paper will discuss the facility and the control algorithms to implement the dynamic dynamometer. Simulation results will be presented.

Dynamic Emulation of Mechanical Loads—An Approach Based on Industrial Drives' Features

“…The dynamics of linear load are presented in (11). Additional load input T ext is applied to the model of emulated load:…”

“…Nonlinear control methods were developed in [9], [10] in order to investigate unknown friction dynamics in the test rig and to compensate non-linear friction. Researchers are now focused on the emulation of different kind of mechanical loads [11]- [13] with previously developed speed and position control structures. The paper presents a completely new speed control structure based on per-unit calculus of inertia [14] and focused on the use with common industrial converters [15].…”

Frequency Analysis of Experimental Waveforms for DC Motors in Digging Applications

“…Both machines are instrumented by a large number of sensors, which signals are recorded by a PC-based data acquisition system. Using an interface between the PCs and the digital drives, a dynamic dynamometer can be implemented as explained in [1]. This way one machine would represent the rope shovel DC motor (hoist or crowd), and the other machine would represent a dynamic load seen by the rope shovel motor under varying digging conditions.…”

“…The authors of this paper are currently involved in a research project supported by industry partners, which included construction of a test facility for full size (around 2000HP) industrial DC machines and an extensive experimental program under controlled steady state and dynamic conditions. The structure of the facility was described in detail in [7] and is also briefly presented in a companion paper [1]. The facility is based on a back-to-back connection of two industrial Figure 1.…”