Modelling of soft starters for automated electric drive

Abstract

In this paper we investigated the conditions of favorable start-up of fixed-speed induction motors in order to increase the functional reliability of the engines. The methods of controlled soft start of induction electric motors with a squirrel-cage rotors are investigated. The study of the mathematical model of induction motors for determining the dependencies of reducing the dynamic component of the transient electromagnetic moment and the magnitude of the starting current. A computer simulation to identify the effectiveness of different methods of controlled start-up of induction motor was carried out. To generate the starters’ models, the MatLab modelling application, Simulink and SimPowerSystems block libraries were used. Based on the results of transient processes simulation in MatLab, the comparative characteristics for different methods of starting an induction motor were given.

Frequency Converter as Node for Edge Computing of Big Data, Related to Drive Efficiency, in Industrial Internet of Things

“…The analysis of the characteristics (Table 1) shows significant differences in the control modes and the quality of the drive operating parameters (in particular, the rotational speed overshoot in the start-up phase, the accuracy of keeping the speed in a steady state and the start-up time). Due to the described differences in each of the motor test runs, the following control modes were checked: scalar (V/f), vector (VFC without encoder, VFC ncontrol with encoder, CFC and CFC with torque control) [2,6,9].…”

Frequency Converter as Node for Edge Computing of Big Data, Related to Drive Efficiency, in Industrial Internet of Things

“…• The motor must be equipped with a resolver or a proper type of encoder • Enables also the asynchronous motor to be controlled directly with torque control or control of a group of electric motors • High torque, current and frequency fluctuations possible The analysis of the characteristics (Table 1) shows significant differences in the control modes and the quality of the drive operating parameters (in particular, the rotational speed overshoot in the start-up phase, the accuracy of keeping the speed in a steady state and the start-up time). Due to the described differences in each of the motor test runs, the following control modes were checked: scalar (V/f), vector (VFC without encoder, VFC ncontrol with encoder, CFC and CFC with torque control) [2,6,9,11].…”

“…The reduction of energy consumption states a key criterion forcing the optimization of the operating parameters of electric drive systems [1][2][3][4]. Modern drive systems are most often extended by frequency converters, which constitute the superior system for setting operating parameters and monitoring the drive motor.…”

“…The extended characteristics of the modes are presented in Table1. Comparison of motor control modes[2,6,9,11].…”

Frequency Converter as a Node for Edge Computing of Big Data, Related to Drive Efficiency, in Industrial Internet of Things

“…The reduction of energy consumption states is a key criterion forcing the optimization of the operating parameters of electric drive systems [1][2][3][4]. Modern drive systems are most often extended by frequency converters, which constitute the superior system for setting operating parameters and monitoring the drive motor.…”