Measurement of electric motor torque of powerful machines with the support of the finite element method

Abstract

The diagnostic method is used to measure the torque of an electric motor. When an electric motor develops defects, its electric current changes, resulting in a change in torque that is difficult and expensive to measure. An electric motor diagnostics system based on the model approach in the state space has been developed. A digital twin, which represents a model of electric motor and works in parallel with a real motor, is developed. The electric motor signals with electric current and angular velocity sensors and output signals of the digital twin are analyzed. The presence of defects of the real electric motor is determined by the magnitude of the misalignment. On detecting a defect, the system transfers the information about it to the control system, activates the indication on the defects appearance, then by methods of fuzzy logic or other methods defines the type of the defect, the system element where the defect occurred, forecasts the remaining life, the control system performs fail-safe operation. If the magnitude of the defect is insignificant, then appropriate maintenance actions are recommended. If the magnitude of the defect is significant, an emergency shutdown of the engine is necessary.