scholarly journals SRM simulation with reduced amount of initial information taking into account saturation of magnetic circuit

2021 ◽  
Vol 2131 (4) ◽  
pp. 042080
Author(s):  
M V Tchavychalov ◽  
A E Nabokov ◽  
I V Bolshikh
Keyword(s):  
Mathematical Modeling ◽  
Control Systems ◽  
Magnetic Circuit ◽  
Traditional Approach ◽  
Angular Position ◽  
Electric Machines ◽  
Initial Information ◽  
Switched Reluctance ◽  
Preliminary Information ◽  
Lookup Tables

Abstract The article describes the currently used approaches to mathematical modeling of switched reluctance electric machines. It is shown that the traditional approach uses a large amount of initial information on the dependence of the flux on the current and the angular position of the rotor in the form of lookup tables. It is proposed to use the description of the flux using the hyperbolic arcsine function. This approach will reduce the amount of preliminary information and thus simplify the procedures for configuring control systems.

scholarly journals Incremental Linear Switched Reluctance Actuator

2021 ◽  
Author(s):  
Aymen Lachheb ◽  
Lilia El Amraoui
Keyword(s):  
Permanent Magnet ◽  
Analytical Model ◽  
Special Interest ◽  
Magnetic Circuit ◽  
Force Density ◽  
Linear Actuator ◽  
Permanent Magnet Synchronous Motors ◽  
Switched Reluctance ◽  
Synchronous Motors ◽  
Electromagnetic Structure

Linear switched reluctance actuators are a focus of study for many applications because of their simple and robust electromagnetic structure, despite their lower thrust force density when compared with linear permanent magnet synchronous motors. This chapter deals with incremental linear actuator have switched reluctance structure. First, the different topologies of linear incremental actuators are mentioned. Furthermore, a special interest is focused on the switched reluctance linear actuator then the operating principal is explained. In addition, an analytical model of the proposed actuator is developed without taking account of the saturation in magnetic circuit. Finally, the control techniques that can be applied to the studied actuator are presented.

scholarly journals Prediction of Eddy Current Losses in Cooling Tubes of Direct Cooled Windings in Electric Machines

Mathematics ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 1096 ◽  
Author(s):  
Mohamed Nabil Fathy Ibrahim ◽  
Peter Sergeant
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Eddy Current ◽  
Electric Machines ◽  
Iron Core ◽  
Commercial Software ◽  
Eddy Current Losses ◽  
Switched Reluctance ◽  
Element Simulation ◽  
Core Losses

The direct coil cooling method is one of the existing cooling techniques for electric machines with concentrated windings, in which cooling tubes of conductive material are inserted between the windings. In such cases, eddy current losses are induced in those cooling tubes because of the time variant magnetic field. To compute the cooling tubes losses, either a transient finite element simulation (mostly based on commercial software), or a full analytical method, which is more complex to be constructed, is required. Instead, this paper proposes a simple and an accurate combined semi-analytical-finite element method to calculate the losses of electric machines having cooling tubes. The 2D magnetostatic solution of the magnetic field is obtained e.g., using the free package “FEMM”. Then, the eddy current losses in the tubes are computed using simple analytical equations. In addition, the iron core losses could be obtained. In order to validate the proposed method, two cases are investigated. In Case 1, a six-toothed stator of a switched reluctance machine (SRM), without rotor, is employed in which six cooling tubes are used while in Case 2 a complete rotating SRM is studied. The proposed method is validated by a 2D transient simulation in the commercial software “ANSYS Maxwell” and also by experimental measurements. Evidently, the proposed method is simple and fast to be constructed and it is almost free of cost.

scholarly journals On-Line Open-Phase Fault Detection Method for Switched Reluctance Motors with Bus Current Measurement

Actuators ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 117
Author(s):  
Alejandra de la Guerra ◽  
Victor M. Jimenez-Mondragon ◽  
Lizeth Torres ◽  
Rafael Escarela-Perez ◽  
Juan C. Olivares-Galvan
Keyword(s):  
Test Bench ◽  
Angular Position ◽  
Current Measurement ◽  
Switched Reluctance Motors ◽  
Switched Reluctance ◽  
Virtual Test ◽  
Open Phase ◽  
On Line ◽  
Different Sources ◽  
A Current

This article introduces an on-line fault diagnosis (FD) system to detect and recognize open-phase faults in switched reluctance motors (SRMs). Both tasks, detection and recognition, are based on functions built with the same information but from different sources. Specifically, these functions are constructed from bus current measurement provided by a sensor and from the estimate of such a current provided by an extended Kalman filter (EKF) that performs the estimation from only rotor angular position measurements. In short, the FD system only requires two measurements for employment: bus current and angular position. In order to show its efficacy, results from numerical simulations (performed in a virtual test bench) are presented. Specifically, these simulations involve the dynamics of the SRM, including the magnetic phenomena caused by the analyzed faults. The motor dynamics were obtained with finite element simulations, which guarantee results close to the actual ones.

scholarly journals Control method of high-speed switched reluctance motor with an asymmetric rotor magnetic circuit

2016 ◽  
Vol 65 (4) ◽  
pp. 685-701 ◽  
Author(s):  
Piotr Bogusz ◽  
Mariusz Korkosz ◽  
Jan Prokop
Keyword(s):  
High Speed ◽  
Magnetic Circuit ◽  
Control Method ◽  
Torque Ripple ◽  
Negative Slope ◽  
Electromagnetic Torque ◽  
Switched Reluctance Motors ◽  
Switched Reluctance ◽  
Asymmetric Rotor ◽  
Current Flows

Abstract In the paper, the modified (compared to the classical asymmetric half-bridge) converter for a switched reluctance machine with an asymmetric rotor magnetic circuit was analysed. An analysis for two various structures of switched reluctance motors was conducted. The rotor shaping was used to obtain required start-up torque or/and to obtain less electromagnetic torque ripple. The discussed converter gives a possibility to turn a phase off much later while reduced time of a current flows in a negative slope of inductance. The results of the research in the form of waveforms of currents, voltages and electromagnetic torque were presented. Conclusions were formulated concerning the comparison of the characteristics of SRM supplied by the classic converter and by the one supplied by the analysed converter.

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