автоматика
Г. Костов, Р. Александров, Определяне на електромагнитния момент на превключваем реактивен двигател

Статията е 3 от 9 в списание АВТОМАТИКА И ИНФОРМАТИКА 2, 2024 г.

СЪДЪРЖАНИЕ

Key Words: Switched Reluctance Motor; rotor position; motor torque; co-energy; JMAG-Express software.

Abstract. Due to the development of electronics and control methods, interest in Switched Reluctance Motor (SRM) is returning and today they are being studied by many scientists around the world. This article discusses the torque determination of a Switched Reluctance Motor (SRM) using co-energy. Described is conversion of electrical energy into magnetic field energy and mechanical energy. In these electric machines, the electromagnetic moment is defined as the change in electromagnetic energy due to the change on the angular position of the rotor. The purpose of the study is to find the parameters on which the torque depends in order to form an appropriate control strategy. To simplify the analysis, it is assumed that the machine remains in an unsaturated state during operation – magnetic saturation is neglected, the inductance of the motor depends only on the rotor angle. An exemplary variation of the inductance from the rotor position is shown, which is a direct consequence of the variation of the total magnetic flux and current in the energized phase winding. The areas of operation of SRM are described. Also shown is an exemplary mechanical characteristic of the SRM where the constant torque, constant power, and decelerating power sections are described for low, medium, and high engine speeds. The structure and control principles of the SRM determine the drive characteristics. The basic control strategy involves successive switching of phases at well-defined moments of time. For accurate control it is necessary to account for the highly nonlinear inductance problems and the following ripples of electromagnetic moment. SRM modeling aims to accurately establish the relationship between magnetic flux, torque, current and rotor position, which will contribute to accurate analysis and precise control of these motors. The simulation of SRM 6/4 was made using JMAG-Express software.

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