Synchronous Reluctance Motor-Drive Advancements

A special issue of Machines (ISSN 2075-1702). This special issue belongs to the section "Electrical Machines and Drives".

Deadline for manuscript submissions: closed (15 May 2023) | Viewed by 12648

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Department of Electrical Power Engineering and Mechatronics, Tallinn University of Technology, 19086 Tallinn, Estonia
Interests: electrical machines and diagnostics of electrical machines
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Special Issue Information

Dear Colleagues,

Synchronous reluctance machines have found their position in research and industrial communities over the past years. They show the potential of taking over a large proportion of induction machines’ market and applications, as they are even more robust, easy to build, and cheap to manufacture.

The synchronous reluctance machine has the advantage of relatively simple construction and low moment of inertia of rotor, which gives fast response characteristic and high torque density. As the name suggests, it is essentially a constant-speed machine dependent on the supply frequency.

These types of machines are widely used in proportioning devices, synthetic-fiber manufacturing industries, wrapping and folding machines, positioning of control rods in nuclear industries, industrial drive systems requiring synchronized and continuous processes, and traction applications. The application areas of the machine are constantly growing and expanding.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:

Design of synchronous reluctance machines;

Design of synchronous reluctance drives;

Control aspects and strategies of synchronous reluctance machines;

Modelling of synchronous reluctance machines and drives;

Novel prototypes of synchronous machines and drives;

Application-oriented synchronous reluctance machines and drives.

Dr. Toomas Vaimann
Guest Editor

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Keywords

  • machines
  • drives
  • motors
  • control
  • prototypes
  • modelling
  • design
  • experimental research
  • applications
  • diagnostics

Published Papers (5 papers)

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Research

19 pages, 2344 KiB  
Article
Field-Oriented Predictive Control Structure for Synchronous Reluctance Motors
by Madalin Costin and Corneliu Lazar
Machines 2023, 11(7), 682; https://doi.org/10.3390/machines11070682 - 27 Jun 2023
Cited by 2 | Viewed by 1103
Abstract
This paper presents a cascade predictive control structure based on field-oriented control (FOC) in the dq rotor reference frame for the synchronous reluctance machine (SynRM). The constant d-axis current control strategy was used, and thus, the electromagnetic torque was directly controlled by [...] Read more.
This paper presents a cascade predictive control structure based on field-oriented control (FOC) in the dq rotor reference frame for the synchronous reluctance machine (SynRM). The constant d-axis current control strategy was used, and thus, the electromagnetic torque was directly controlled by the q-axis current. Because the model of the two axes of currents from the inner loop is a coupled non-linear multivariable one, to control in a non-interaction and linear way the two currents, their decoupling was achieved through feedforward components. Following the decoupling, two independent monovariable linear systems resulted for the two current dynamics that were controlled using model predictive control (MPC) algorithms, considering their ability to automatically handle the state bounds. The most important bounds for SynRM are the limits imposed on currents and voltages, which in the dq plane correspond to a circular limit. To avoid computational effort, linear limitations were adopted through polygonal approximations, resulting in rectangular regions in the dq plane. For the outer loop that controls the angular speed with a constrained MPC algorithm, the q-axis current closed-loop dynamics and the torque linear equation were considered. To evaluate the performance of the proposed cascade predictive control structure, a simulation study using MPC controllers versus PI ones was conducted. Full article
(This article belongs to the Special Issue Synchronous Reluctance Motor-Drive Advancements)
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14 pages, 4424 KiB  
Article
Response Surface Method for Optimization of Synchronous Reluctance Motor Rotor
by Svetlana Orlova, Janis Auzins, Vladislav Pugachov, Anton Rassõlkin and Toomas Vaimann
Machines 2022, 10(10), 897; https://doi.org/10.3390/machines10100897 - 5 Oct 2022
Cited by 1 | Viewed by 1856
Abstract
In order to define the best design structure of the synchronous reluctance motor (SynRM) rotor, optimization must be carried out, implying the selection of the best alternative for each specific criterion. The optimization of an electrical machine is a complicated work involving meeting [...] Read more.
In order to define the best design structure of the synchronous reluctance motor (SynRM) rotor, optimization must be carried out, implying the selection of the best alternative for each specific criterion. The optimization of an electrical machine is a complicated work involving meeting different criteria requirements while dealing with a range of constraints. In order to implement the optimization, it is necessary to process a huge number of options, changing the combinations of the factors affecting criteria and restrictions, which is a time-consuming process. This research presents the optimization technique that gives a mathematically proven solution of the optimal rotor design of a synchronous reluctance machine obtained by using metamodels in the form of local polynomial approximations. Analysis of the results of numerical modeling and experimental investigation has been performed in order to validate the developed technique and recommendations. SynRM rotor was manufactured, with the stator to be taken from the 1.1 kW W21 WEG induction motor, which makes possible the relevant experimental study. The performance analysis of the developed SynRM is shown in the paper. Full article
(This article belongs to the Special Issue Synchronous Reluctance Motor-Drive Advancements)
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23 pages, 3350 KiB  
Article
Systematic Metamodel-Based Optimization Study of Synchronous Reluctance Machine Rotor Barrier Topologies
by Branko Ban and Stjepan Stipetic
Machines 2022, 10(8), 712; https://doi.org/10.3390/machines10080712 - 19 Aug 2022
Cited by 2 | Viewed by 2277
Abstract
Nowadays, due to the confidence in modeling tools and rapid product iteration, electric machine designers primarily rely on simulations. This approach reduces time and cost and is very useful when comparing different machine topologies. The prototype stage usually comes after the depletion of [...] Read more.
Nowadays, due to the confidence in modeling tools and rapid product iteration, electric machine designers primarily rely on simulations. This approach reduces time and cost and is very useful when comparing different machine topologies. The prototype stage usually comes after the depletion of all simulation resources. When designing a synchronous reluctance machine, the first step is the selection of rotor barrier type. The literature provides several topologies but does not clearly state which one yields the best performance. The goal of this paper is to determine the best variant for a six-pole machine and the selected requirements using a metamodel-based optimization approach. Seven rotor topologies with different complexities were derived from circular, hyperbolic, and Zhukovsky barrier types (circular concentric, circular variable depth, hyperbolic with fixed eccentricity, hyperbolic with variable eccentricity, original Zhukovsky, modified Zhukovsky variable depth and modified Zhukovsky with equal barrier depth). The novelty of the proposed strategy is in the systematic and fair comparison of different rotor topologies. This approach significantly reduces the total optimization time from several weeks to a few days. Additionally, a novel modified Zhukovsky variable depth topology, which merges the best qualities of all considered variants, was developed. An identical optimization strategy was applied to all variants, and the final results prove that the barrier type substantially affects the final performance of the machine. The best results are achieved by the modified Zhukovsky variable depth topology. In relation to the worst (baseline) topology, the performance gain is 14.9% and the power factor is increased from 0.61 to 0.67. An additional study using different numbers of barrier layers (3, 4, and 5) was conducted to determine the best topology. The best results were achieved with the original four barrier layers. Full article
(This article belongs to the Special Issue Synchronous Reluctance Motor-Drive Advancements)
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22 pages, 1664 KiB  
Article
Absolutely Feasible Synchronous Reluctance Machine Rotor Barrier Topologies with Minimal Parametric Complexity
by Branko Ban and Stjepan Stipetic
Machines 2022, 10(3), 206; https://doi.org/10.3390/machines10030206 - 11 Mar 2022
Cited by 3 | Viewed by 3322
Abstract
The first step in the synchronous reluctance machine design is the selection of rotor flux barrier type. The literature provides various barrier construction methods with a common goal of reducing parametric complexity. However, too excessive simplification can lead to decreased performance, while overly [...] Read more.
The first step in the synchronous reluctance machine design is the selection of rotor flux barrier type. The literature provides various barrier construction methods with a common goal of reducing parametric complexity. However, too excessive simplification can lead to decreased performance, while overly complex geometries tend to increase optimization time. This paper presents a set of novel flux barrier construction methods with an increased degree of freedom and minimal geometrical complexity. The paper proposes four topologies based on circular, hyperbolic, and original Zhukovsky lines. When considering parametrization complexity, the original Zhukovsky type is the simplest, but it has barrier depth limitations. Other topologies have equal complexity. The paper proposes a novel Modified Zhukovsky variable depth type based on geometrical conformal mapping of the original Zhukovsky lines. The step-by-step construction of each topology is presented in a form of pseudo-code with detailed comments and illustrations. Overall, the presented research provides a valuable starting point for the designer who wants to investigate different smooth rotor barrier topologies. Full article
(This article belongs to the Special Issue Synchronous Reluctance Motor-Drive Advancements)
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18 pages, 1910 KiB  
Article
Coil Number Impact on Performance of 4-Phase Low Speed Toothed Doubly Salient Permanent Magnet Motors
by Cherif Guerroudj, Jean-Frederic Charpentier, Rachid Saou, Yannis L. Karnavas, Nicolas Bracikowski and Mohammed El-Hadi Zaïm
Machines 2021, 9(7), 137; https://doi.org/10.3390/machines9070137 - 16 Jul 2021
Cited by 3 | Viewed by 2654
Abstract
The low speed toothed doubly salient permanent-magnet (TDSPM) machine is an interesting candidate motor for electric ship applications because, of its high torque output, maintenance-free operation and flexible working modes, which gives the opportunity to increase system’s reliability, and decrease the system size, [...] Read more.
The low speed toothed doubly salient permanent-magnet (TDSPM) machine is an interesting candidate motor for electric ship applications because, of its high torque output, maintenance-free operation and flexible working modes, which gives the opportunity to increase system’s reliability, and decrease the system size, weight and noise which are key features for naval applications. However, particularly in the 3-phase configuration, the stator and rotor saliency of these machines leads to a high level of torque ripple. To overcome these drawbacks, the use of polyphase machines (with a number of phases greater than three) can be a relevant solution. In this paper, an optimal design of two kind of novel 4-phase motors is performed in order to fulfil the specifications of a high power naval ship propulsion. The designs aim to maximize the torque to mass ratio. The motors’ performances are directly linked to their structural parameters, so, the impact of the coil number in terms of mean torque, torque ripple, energy ratio values, and efficiency is also presented and analysed. The design of these two electromagnetic structures, as well as the determination of their electromagnetic performances, are carried out using a particle swarm optimization algorithm (PSO) with taking into account thermal constraint. The performance of the proposed machine in terms of mean torque, torque ripple, energy ratio, and efficiency values is presented and analysed. The results obtained reveal that the TDSPM machines with four poles/phase are good candidates to meet the requirements of high power direct-drive ship propulsion system. Full article
(This article belongs to the Special Issue Synchronous Reluctance Motor-Drive Advancements)
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