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... The output power of the machine is determined by (1). 35 For an AFPMSG, the relation between output power, outer diameter and its main physical characteristics is 15,19 P out ¼ π 2 K D K w n s B g A m ηcosφD out ...
Air‐cored axial‐flux permanent‐magnet synchronous generators (AFPMSGs) are potential candidates for gearless direct‐coupled wind turbines (DCWTs) owing to providing high efficiency and power density. The design of a DCWT generator is so complicated since the generator cost, dimension, and weight affected by gear elimination. Therefore, it is essential to find an optimal AFPMSG design at rated conditions. In this paper, an accurate procedure for the optimal design of an air‐cored AFPMSG applicable for DCWTs is proposed. The genetic algorithm (GA) is used for multi‐objective design optimization to reach the optimal configuration as well as system dimension in order to decrease the weight, increase the power density and enhance the effectiveness of the generator. To validate the efficiency of the suggested optimization proceducer, a 30 kW AFPMSG has been considered as a case study. The results of optimization have been investigated by finite element analysis (FEA). A prototype generator is also fabricated, and the test results are offered and compared with the numerical study. The outcomes show that there exists an acceptable agreement between FEA and experimental outcomes with the error percentage about of 1.35%.
... Generally, the design optimization of electrical machine includes two substantial aspects, namely optimization model and optimization method [11]. Various direct physical models, such as the torque/power equation (average-value model) expressed in terms of specific electromagnetic loadings [12]- [14], electrical equivalent circuit (EEC) model [15], [16], magnetic equivalent circuit (MEC) model [17], [18], finite-element (FE) model [19], and a number of emerging indirect models termed as surrogate models [11] can be effectively employed in design practice. Once the optimization model is developed, suitable optimization method, which can be single-or multi-objective, classical or modern intelligent optimization algorithms, can further be determined according to the types of the problem and optimization variables. ...
... Considering all these features, there are many manuscripts that deal with analysis and performance predictions [8] [9] [10] [11] [12] [13] or the design and manufacturing [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] of AFIMs. In the first group, most of the literature has described a quasi-three dimensional mathematical model or finite element analysis. ...
Because Axial Flux Induction Motors (AFIMs) have many advantages over radial flux (conventional) ones, they are increasingly used in industrial applications. So, their performance prediction is an important issue. On the other hand, parameter estimation is an inseparable part of performance prediction. In this paper, a new method, based on the discharge current of stator windings, is presented. In the proposed method, theoretical and practical discharge currents are compared to calculate coefficients, time constants and parameters. Then, calculated parameters are employed in the d-q model of the AFIM. Finally, 3-D finite element analysis and experimental tests are used to verify the proposed method.
... Il est d'ailleurs toutà fait possible de calculer, pour une forme de forcé electromotrice donnée, une forme de courant qui assure l'absence de pulsations [31]. La référence [18] montre que la situation idéale correspondà une forceélectromotrice carrée associéeà un courant carré parfaitement phasé. Dans ce cas, le coupleélectromagnétique instantané est rigoureusement constant et la densité de couple est maximisée. ...
This thesis tackles with the development of design tools dedicated to Permanent Magnet multiphase machines with smooth airgap supplied by Pulse Width Modulation Voltage Source Inverter. Based on the multi-machine decomposition that splits the multiphase machine into several fictitious machines that are magnetically uncoupled and mechanically coupled, the chosen method consists in studying the converter-machine adaptation by putting the design goals on the fictitious machines. A matrix representation of the multiphase winding, the evelopment of analytical field calculation method and the use of the Discrete Fourier Transform operator allow to define for each fictitious machine a winding and a magnet layer. Thereby the goals and the constraints related to parasitic current reduction and torque quality improvement can be directly formulated on the fictitious quantities, which allows to deduce optimised design approach.
... ECENT developments of the doubly salient permanent magnet (DSPM) motor have shown that it has many advantages such as high efficiency, high power density and high energy conversion ratio [1]–[3]. Thus, more and more attention has been paid to this motor since its advent. ...
In this paper, magnetic field analysis of a new doubly salient permanent magnet (DSPM) motor is carried out based on finite element method (FEM). Hence, the corresponding static characteristics including PM flux linkage, self-inductance, mutual inductance, and static torque-are deduced (the interaction between the PM field and armature field are taken into account). New methods for measuring the motor inductance are also proposed. The theoretical analysis is verified by experimental results.
... and η – the machine efficiency, A S – the stator electrical loading (25000-90000 At/m), BB gmax – the maximum value of the airgap flux density (1.2…1.8T as a function of lamination quality), D g – the machine airgap diameter, K I – the current waveform factor [4], K e – emf factor, l s -effective stack length. ...
The present paper approaches the comparative design and analysis of 5 SRM topologies for an EPAS application. Different number of phases and different combination of stator and rotor pole number will be considered, keeping the same main dimensions (outer and inner stator diameter, airgap length, stack length, stator pole height, stator yoke width, rotor pole height) and the same winding per phase (number of turns and wire diameter). A preliminary sizing of the machine will be carried on, giving the initial geometric data. The key dimensions will be calculated and the winding will be dimensioned. A numerical-based performances analysis will be performed for each case.
... A systematic and easy-to-use method based on sizing equations is therefore very desirable to compare the capability of machines with different structures. The general-purpose sizing and power density equations have recently been developed in terms of the main machine dimensions D o 2 L e instead of air gap dimension D g 2 L e at Wisconsin Electric Machine and Power Electronics Consortium (WEMPEC) at the University of Wisconsin-Madison [1] [2] [3] [4]. This approach permits a comparison of the capability of different machine topologies based upon the overall occupied volume. ...
... . Dual-rotor, toroidally wound, slotted, RFTPM machine It has been demonstrated that the dual-rotor RFTPM machine has the following features [6] [7] [8]: • Greatly shortened end windings • High efficiency • High torque density • Low-cost techniques available to reduce cogging torque III. GENERAL PURPOSE SIZING EQUATIONS AND POWER DENSITY The general-purpose sizing equations have been developed in [1] [2] [3] [4] [5] and take the form of ...
... For a surface mounted machine like the RFTPMs shown in Fig. 2A and 2B, A pm is equal to A p . For the RFTPM machine, there is no rotor winding, hence K φ = 0. Considering the typical trapezoidal waveforms in PM machines, K i K pw is given as 0.881[2]. ...
A novel machine family – the dual-rotor, Radial-Flux, Toroidally wound, Permanent-Magnet (RFTPM) machine – has been proven in a previous paper to be able to improve the machine efficiency and boost the torque density. This paper will develop the sizing equations for the RFTPM machines based on the machine overall sizes, material properties, and electrical and magnetic loadings to provide a quick method to evaluate the RFTPM machines. The accuracy of the developed sizing equations is proven by a prototype machine. A comparison among induction, axial-flux PM, and RFTPM machines are made based on the sizing equations. The RFTPM structure appears to be capable of substantially higher power density than equivalent induction machines, and more potential to achieve higher torque density than axial-flux PM machines.
... Il est d'ailleurs toutà fait possible de calculer, pour une forme de forcé electromotrice donnée, une forme de courant qui assure l'absence de pulsations [31]. La référence [18] montre que la situation idéale correspondà une forceélectromotrice carrée associéeà un courant carré parfaitement phasé. Dans ce cas, le coupleélectromagnétique instantané est rigoureusement constant et la densité de couple est maximisée. ...
Cette thèse a pour objet le développement d'outils de conception de machines polyphasées à pôles lisses alimentées par onduleur de tension à modulation de largeur d'impulsion. Basée sur la décomposition multimachine de la machine polyphasée en une somme de machines fictives magnétiquement découplées et mécaniquement couplées, l’approche adoptée consiste à étudier le problème de l’adaptation convertisseur-machine en reportant les objectifs sur les machines fictives. Une représentation matricielle du bobinage polyphasé, le développement d’un modèle de calcul analytique du champ et l’introduction de la Transformée de Fourier Discrète permettent d’associer aux machines fictives un bobinage et une couche d’aimants. Les objectifs et contraintes liés à la réduction des courants arasites et à l’amélioration de la qualité du couple peuvent alors être formulés directement sur des grandeurs fictives, ce qui permet de déduire des démarches de conception optimale.
