Motor Monitoring System for a Continuous Miner

摘要

The U.S. Bureau of Mines has investigated the early detection of insulationfailure in squirrel cage induction motors for the past four years. This was done using sophisticated empirical data modeling techniques based on values calculated from a motor's voltage and current phasors. This data modeling technique produces a pair of polynomial equations that calculate the insulation leakage current and power. These models were implemented in a prototype system, described in this paper, that monitors six motors on a continuous miner for insulation leakage. These insulation leakage values are used to anticipate insulation failure. The system consists of a motor-data-system for each motor on the machine and a control computer located some distance from the miner. Each motor-data-system consists of an analog interface to the motor's voltages and currents, a single board computer that reads digitized data and calculates voltage and current phasors, and a bus node that interfaces the single board computer with the rest of the system. The control computer is connected to the motor-data-systems by BITBUS. Using BITBUS, it can request and receive phasor data from any motor's motor-data-system.