Analytical method for the prediction of natural frequencies of switched reluctance motor based on electromechanical analogy method

2018 ◽  
Vol 37 (1) ◽  
pp. 224-241 ◽  
Author(s):  
Chao Tan ◽  
Honghua Wang ◽  
Ling Chen
Keyword(s):  
Analytical Method ◽  
Natural Frequencies ◽  
Equivalent Stiffness ◽  
Additional Mass ◽  
Stator Core ◽  
Content Type ◽  
Switched Reluctance ◽  
Analogy Method ◽  
Reluctance Motor ◽  
3D Fea

Purpose An improved analytical method for calculating the natural frequencies of a switched reluctance motor (SRM) stator is proposed in this paper. The method is different from traditional analytical methods, which only consider the influence of mass of the stator poles and windings on the natural frequencies of the SRM stator. This paper aims to consider the influence of stiffness and mass of the stator poles and windings simultaneously and reasonably. Design/methodology/approach An innovated analytical method based on the electromechanical analogy method is presented. In the proposed analytical formulae for calculating the natural frequencies, the influence of the windings on natural frequencies is considered by using the springs to simulate the flexible connection between the stator core and windings, and the stator poles are treated as both additional mass and additional equivalent stiffness. Both three-dimensional (3D) finite-element analysis (FEA) and experimental modal analysis results validate the improved method. Findings The influence of the mass and stiffness of stator winding is considered by using the springs to simulate the flexible connection between the stator core and windings, and the stator poles are treated as both additional mass and additional equivalent stiffness. The traditional analytical method only considers the influence of mass. Therefore, the calculation results are comparatively lower than 3D FEA results and may lead to a large error. The 3D FEA and experimental modal analysis confirm that the proposed method has good precision for low-order natural frequency calculation of SRMs. Originality/value An improved analytical method for calculating the natural frequencies of an SRM stator is proposed. Unlike the traditional analytical method, the proposed method can consider the influence of stiffness and mass of the stator poles and windings. This method is valuable for designers to predict the natural frequencies accurately.

Analysis Performance of SRM Based on the Novel Dependent Torque Control Method

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8203
Author(s):  
Piotr Bogusz ◽  
Mariusz Korkosz ◽  
Jan Prokop ◽  
Mateusz Daraż
Keyword(s):  
Motor Control ◽  
Natural Frequencies ◽  
Control Method ◽  
Torque Control ◽  
The Novel ◽  
Control Methods ◽  
Vibration Acceleration ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
Source Current

This paper presents a description and the results of simulations and laboratory tests of proposed methods for dependent torque control in a Switched Reluctance Motor (SRM). The proposed methods are based on Dependent Torque Motor Control (Rising Slope), DTMC(RC), and Dependent Torque Motor Control (Falling Slope), DTMC(FC). The results of these studies were compared with those on the Classical Torque Motor Control (CTMC) method. Studies were conducted for each of the analyzed control methods by determining the efficiency of the drive and the RMS of the source current and analyzing the vibrations generated for each of the control methods. The harmonics of the phase currents, which caused an increase in the level of vibrations generated, were determined. The usefulness of the proposed methods for controlling SRMs was assessed based on simulations and experiments. Additionally, the natural frequencies of the stator of the tested SRM were determined by a simulation using the Ansys Maxwell suite. The levels of vibration acceleration generated by the SRM were compared for the considered control methods.

Analysis of torque ripple and fault-tolerant capability for a 16/10 segmented switched reluctance motor in HEV applications

2019 ◽  
Vol 38 (6) ◽  
pp. 1725-1737
Author(s):  
Xiaodong Sun ◽  
Jiangling Wu ◽  
Shaohua Wang ◽  
Kaikai Diao ◽  
Zebin Yang
Keyword(s):  
Fault Tolerant ◽  
Switched Reluctance Motor ◽  
Torque Ripple ◽  
Experimental Results ◽  
Element Analysis ◽  
Content Type ◽  
Switched Reluctance ◽  
Output Torque ◽  
Reluctance Motor ◽  
Lower Torque

Purpose The torque ripple and fault-tolerant capability are the two main problems for the switched reluctance motors (SRMs) in applications. The purpose of this paper, therefore, is to propose a novel 16/10 segmented SRM (SSRM) to reduce the torque ripple and improve the fault-tolerant capability in this work. Design/methodology/approach The stator of the proposed SSRM is composed of exciting and auxiliary stator poles, while the rotor consists of a series of discrete segments. The fault-tolerant and torque ripple characteristics of the proposed SSRM are studied by the finite element analysis (FEA) method. Meanwhile, the characteristics of the SSRM are compared with those of a conventional SRM with 8/6 stator/rotor poles. Finally, FEA and experimental results are provided to validate the static and dynamic characteristics of the proposed SSRM. Findings It is found that the proposed novel 16/10 SSRM for the application in the belt-driven starter generator (BSG) possesses these functions: less mutual inductance and high fault-tolerant capability. It is also found that the proposed SSRM provides lower torque ripple and higher output torque. Finally, the experimental results validate that the proposed SSRM runs with lower torque ripple, better output torque and fault-tolerant characteristics, making it an ideal candidate for the BSG and similar systems. Originality/value This paper presents the analysis of torque ripple and fault-tolerant capability for a 16/10 segmented switched reluctance motor in hybrid electric vehicles. Using FEA simulation and building a test bench to verify the proposed SSRM’s superiority in both torque ripple and fault-tolerant capability.

A simple turn-on and turn-off angles searching method for copper loss minimization of the switched reluctance motor

2017 ◽  
Vol 36 (4) ◽  
pp. 1059-1074
Author(s):  
Hai-Jin Chen ◽  
Jin-Yang Li
Keyword(s):  
Switched Reluctance Motor ◽  
Loss Minimization ◽  
Content Type ◽  
Switched Reluctance ◽  
Analytical Computation ◽  
Copper Loss ◽  
Turn On ◽  
Reluctance Motor ◽  
On Line ◽  
Optimal Turn

Purpose The purpose of this paper is to present a simple and effective method to search the optimal turn-on and turn-off angles on-line for the control of the switched reluctance motor (SRM). The optimal turn-on and turn-off angles are defined as the ones that can meet torque production requirements with minimum copper loss. Design/methodology/approach The optimal turn-on and turn-off angles are first defined based on the analysis of the SRM losses and torque production principles. Then the algorithm for optimal angles searching is developed, and the searching parameters are determined through analytical computation. The optimal angles are approached on-line with iterative process. Simulation and experiments are finally performed to verify the proposed method. Findings The presented method can meet torque production requirements while copper loss is minimized. The optimal turn-on and turn-off angles are generally approached within five phase cycles for most of the SRM operation modes. Furthermore, the SRM drive system using the presented method exhibits good dynamics during starting and sudden load operations. Practical implications The presented method is simple, and implementation of it is easy. It is an eligible candidate for industrial applications where energy conversion efficiency is crucial. Originality/value The optimal turn-off angle definition that considers both torque production and copper loss minimization is proposed. The turn-on and turn-off angles are searched independently on-line with little SRM geometrical information. The searching steps are derived through analytical computation and qualitative analysis so that both the searching speed and algorithm convergence are balanced.

A fault tolerant sensorless position estimation scheme for switched reluctance motor at low speed

2020 ◽  
Vol 39 (4) ◽  
pp. 823-837
Author(s):  
Feng Dong ◽  
Hao Chen ◽  
Shuai Xu ◽  
Sihang Cui
Keyword(s):  
Control Strategy ◽  
Fault Tolerant ◽  
Sensorless Control ◽  
Switched Reluctance Motor ◽  
Position Estimation ◽  
Content Type ◽  
Switched Reluctance ◽  
Low Speed ◽  
Rotor Position ◽  
Reluctance Motor

Purpose This paper aims to present a novel position sensorless control scheme with fault-tolerance ability for switched reluctance motor at low speed. Design/methodology/approach First, the detection pulses are injected in the freewheeling and idle intervals of each phase. Second, the aligned position of each phase can be detected by comparing the consecutive rise time of detection current. Third, the whole-region rotor position and real-time rotational speed can be updated four times for the improvement of detection accuracy. Finally, the fault-tolerant control strategy is performed to enhance the robustness and reliability of proposed sensorless scheme under faulty conditions. Findings Based on proposed sensorless control strategy, the estimated rotor position is in good agreement with the actual rotor position and the maximum rotor position error is 1.5°. Meanwhile, the proposed sensorless scheme is still effective when the motor with multiphase loss and the maximum rotor position error is 1.9°. Moreover, the accuracy of the rotor position estimation can be ensured even if the motor is in an accelerated state or decelerated state. Originality/value The proposed sensorless method does not require extensive memory, complicated computation and prior knowledge of the electromagnetic properties of the motor, which is easy to implement. Furthermore, it is suitable for different control strategies at low speed without negative torque generation.

Mathematical modeling of a novel bearingless switched reluctance motor

2013 ◽  
Vol 33 (1/2) ◽  
pp. 376-397 ◽  
Author(s):  
Xilian Wang ◽  
Baoming Ge ◽  
Jin Wang
Keyword(s):  
Mathematical Model ◽  
Finite Element ◽  
Magnetic Circuit ◽  
Switched Reluctance Motor ◽  
The Novel ◽  
Content Type ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
Radial Forces ◽  
First Time

Purpose – The novel bearingless switched reluctance motor (BSRM) is proposed recently, which is different from the conventional BSRM in the stator structure and suspension winding arrangement. The reduced number of suspension windings makes the novel BSRM much simpler, so that the control circuit and algorithm are greatly simplified when compared to those of the conventional BSRM. This paper for the first time proposes the novel BSRM's analytic model, including the mathematical relationships among the winding currents, rotor angle, radial forces, and motor torque, to further achieve the suspending forces and torque control. The paper aims to discuss these issues. Design/methodology/approach – The magnetic equivalent circuit method is employed to obtain the self-inductances and mutual-inductances of the motor torque windings (main windings) and suspension windings (control windings). The straight flux paths are combined with the elliptical fringing flux paths to calculate the air-gap permeances, and the stored magnetic energy. Then, the mathematical expressions of radial forces and torque are derived. A novel BSRM prototype is analyzed through using the proposed analytical model and the finite element model. The results of both methods are compared to verify the proposed mathematical model. Findings – The proposed mathematical model of the novel BSRM considering unsaturated magnetic circuits is verified by finite-element analysis results. Research limitations/implications – The mathematical model represents the situation of magnetic circuit unsaturated and is not suitable for the magnetic circuit saturation. It cannot be used to control the motor which is working in the deep magnetic circuit saturation region. Practical implications – Building mathematical model is a necessary step for the motor's suspension and rotating control. The built model provides the fundamental for the preliminary control algorithm and experimental study of this novel BSRM. Originality/value – For the first time, the novel BSRM's mathematical model is proposed. It provides necessary fundamental for the motor's further analysis, design, and suspending and rotating controls.

scholarly journals Reconstruction of the Switched Reluctance Motor Stator

2012 ◽  
Vol 63 (1) ◽  
pp. 3-12 ◽  
Author(s):  
Eyhab El-Kharashi ◽  
Hany Hassanien
Keyword(s):  
Classical Method ◽  
Dynamic Performance ◽  
Switched Reluctance Motor ◽  
Stator Core ◽  
Switched Reluctance ◽  
Control Techniques ◽  
Pi Controllers ◽  
Reluctance Motor ◽  
Before And After ◽  
Artificial Neural Network Ann

Reconstruction of the Switched Reluctance Motor Stator The paper re-designs the conventional 6/8 switched reluctance motor (SRM) by a particular way to minimize the losses. The flux loops are shortened by making each two stator teeth incorporated in one magnetic circuit only. Subsequently the flux does not cross in some iron parts of the stator core backs. These unused iron sections are taken off consequently the iron losses decreased. Now the stator consists of three separated sections and they are fixed inside non-magnetic cylinder. The copper losses also are decreased because less copper windings are used to produce the same amount of the output torque as the flux paths become short then the flux density increases. The analysis and comparison of the 6/8 SRM before and after the re-design process are presented. A m files Matlab software is used to simulate the dynamic performance. Then the paper proceeds to examine different control techniques to the new design. The hysteresis and PI controllers are used as classical method to control the SRM. Then the artificial neural network (ANN) is used to test the new control techniques.

Analysis of Main Dimensions Effects on Performance of Transverse Flux Switched Reluctance Motors

2011 ◽  
Vol 383-390 ◽  
pp. 1921-1925
Author(s):  
Zhi Gang Wang ◽  
Ping Tan ◽  
Sui Chun Qu
Keyword(s):  
Switched Reluctance Motor ◽  
Air Gap ◽  
Switched Reluctance Motors ◽  
Stator Core ◽  
Switched Reluctance ◽  
Reluctance Motor ◽  
Transverse Flux

The transverse flux switched reluctance motor (TFSRM) has the advantage of switched reluctance motors and transverse flux motor. This paper examines the effects of the main dimensions such as the polar distance, the stator core, the length of air gap ,etc, on the performance.

A new switched reluctance motor with distributed winding

2014 ◽  
Vol 33 (6) ◽  
pp. 2158-2179 ◽  
Author(s):  
Qingqing Ma ◽  
Baoming Ge ◽  
Daqiang Bi ◽  
Fernando J.T.E. Ferreira ◽  
Aníbal T. de Almeida
Keyword(s):  
Finite Element ◽  
Double Layer ◽  
Switched Reluctance Motor ◽  
Simulation Method ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Analysis Model ◽  
Content Type ◽  
Switched Reluctance ◽  
Reluctance Motor

Purpose – The purpose of this paper is to propose a new three-phase switched reluctance motor (SRM), and achieve high-torque and low-cost. This new SRM's winding configuration uses the double-layer distributed windings, which is different from the conventional SRM's single tooth coils. Design/methodology/approach – The operating principle of new SRM is analyzed, and the voltage equation and the generated torque are deduced. Finite element method (FEM) and finite element circuit coupled method are utilized to evaluate the new motor's operating performances. The two dimensional (2D) frequency response analysis model is employed in the FEM model. Based on the 2D frequency response analysis model, the magnetic field distribution, self-inductance, and mutual-inductance for the new SRM are analyzed in detail. A co-simulation model using FE analysis package and Matlab-Simulink is proposed to simulate the new SRM drive. The simulated and experimental results verify the new SRM. Findings – For the new SRM with double-layer distributed windings, a co-simulation method is proposed to analyze its characteristics. The new SRM presents lower torque ripple coefficient and generates larger torque than the conventional SRM, with three-wire and standard full bridge power converter, rather than six-wire and asymmetric half-bridge converter for conventional SRM. Originality/value – This paper proposes a new SRM with the double-layer distributed windings driven by a standard full bridge inverter. In order to calculate dynamic characteristics of the new SRM, a co-simulation method using FEM and Simulink is proposed to simulate the new SRM drive, where the power inverter and the current chopping control algorithm are implemented.

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