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Wireless power transfer (WPT) is a promising technology and has attracted many researchers' attention due to its inherent advantages such as reliability, safety, flexibility, and low maintenance costs. For WPT systems, the output voltage varies according to the variable loads and the coupling coefficient conditions, affecting system stability and efficiency. In this regard, this study is concerned with the tracking control problem of WPT systems based on fuzzy supervisory proportional–integral (PI) controller and a phase shift modulation technique, which is for the first time proposed by this paper. By introducing appropriate fuzzy rules, the proposed control scheme not only can track the desired output voltage but also has better robust behaviour to deal with the problem of variations of circuit elements and coupling coefficients. That is, the proposed fuzzy supervisory PI control scheme can perform better than the traditional PI controller. Analysis of the designed control method and simulation results validate the superiority of the proposed method over the traditional PI controller in all conditions, which can make it a suitable choice for the applications of electric vehicle charging systems. The analysis is supported by experimental measurements. [ABSTRACT FROM AUTHOR]

This paper describes the design optimization and analysis of reluctance-synchronous linear motor with a solid or laminated moving part (secondary). The calculation of the motor performance is described using analytical formulation and numerical method. The main advantage of this system is the removal of permanent-magnet secondary and replacing it with a reluctance-type secondary. The first purpose of this paper is designing a reluctance-synchronous linear motor with the maximum-output thrust force and optimum power factor. In this model, a long primary (armature) and a short secondary are evaluated. Distributed winding is considered for design and analysis. Finally, air-gap winding configuration is evaluated. Index Terms--Design and analysis, electromagnetic launcher, finite-element method, reluctance-synchronous linear motor.

This paper presents an analytical model of axial air gap induction motors with solid rotors that includes the two-dimensional current distribution in the rotor. The model is quasi-three-dimensional and considers the circumferential as well as radial and angular dimensions. Also, one can consider the various arrangements of the stator windings i.e., single layer, double layer, and gramme for this type of motor. The method is valid for both constant current and constant voltage sources. Comparison of the simulation results of the produced torque with the experimental ones shows the high accuracy of the proposed method. Index Terms--Analytical, axial air gap, induction machine, solid rotor.

Wireless power transfer (WPT) system based on a dynamic wireless charging (DWC) scheme, eliminates waiting time for charging electric vehicles (EVs), increases the range of motion, reduces the size of Li‐ion battery, and automates the charging process. In the DWC method, an EV frequently passes the charger transmitter pads at maximum speed to charge the onboard battery. The charger must have a quick and smooth transient response that employs the proper charging strategy for the battery. Here, a model predictive controller (MPC) is proposed to deploy a suitable DWC based on constant current/voltage (CC/CV) charging protocol. The designed MPC functionality is demonstrated by simulation and experimental results for both CC/CV strategies while battery state of charge (SOC) is estimated by a simple and stable technique in the primary side. The applied CC/CV MPC scheme performs properly in all conditions with a fast critically damped start‐up, which makes it a potential choice to charge EV in dynamic and static modes. The simulation results of the proposed controller are verified by implementing a 90 W WPT testbed at 85.5 kHz switching frequency and 100 mm coils' air gap. [ABSTRACT FROM AUTHOR]

Flux‐switching permanent magnet (FSPM) machine attracted a great deal of attention for industrial applications owing to its high efficiency and high torque/power densities. However, on the downside, it suffers from high cost of rare‐earth permanent magnets (REPMs). Although employing ferrite magnets remarkably reduces the cost of material, ferrite magnet lower energy product will negatively affect the electromagnetic performance of this machine. As a solution, the double‐stator flux‐switching permanent magnet (DSFSPM) machine has been presented in this paper to improve the electromagnetic performance of a conventional ferrite based FSPM counterpart. In this regard, a new analytical approach followed by a brief discussion of the influence of rotor pole number on the electromagnetic performance of two DSFSPM machines with 10‐ and 14‐pole rotors are studied. It is shown that 12/14 DSFSPM machine with ferrite magnets generates almost 30% more developed torque than the other with 10‐pole rotor. Then, a comprehensive comparison on the electromagnetic performances of a 12/14 DSFSPM machine with ferrite magnets, and two 12/14 FSPM machines with REPMs and ferrite magnets are investigated by finite element method. Besides, a cost study highlights the monetary beneficial of the proposed 12/14 DSFSPM machine for the competitive EVs market. Furthermore, a laboratory scale 12/14 DSFSPM machine is designed based on analytical approach, optimized by Taguchi optimization method, and experimentally tested to validate both analytical and FEM results. [ABSTRACT FROM AUTHOR]

A dq model representation of segmented secondary linear flux switching motors (SSLFSMs) is investigated. In these motors, the armature and field windings are both mounted in the primary slots and the secondary is only composed of simple laminated segments. This type of motors inherits both merits of high force density from linear synchronous motors and simple secondary structure from linear induction motors. Due to its simple and consequently low‐cost secondary structure, it is applicable to transportation systems like Maglev. Position and speed control of this motor is essential for rail transportation applications. Therefore, derivation of an appropriate analytical model for control purposes is needed. An analytical method to represent the dq model of SSLFSMs is presented. Employing this method, the d‐ and q‐axis inductances and the developed electromagnetic thrust and normal force are calculated. To verify the proposed model, three different finite‐element method‐based models are studied and one is chosen as the basis for comparison. All results obtained by the analytical model are verified by this finite‐element method‐based model. Moreover, a prototype of SSLFSMs is built to validate the study. [ABSTRACT FROM AUTHOR]