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To meet the high-performance requirements of new energy vehicle drive, the optimization design of 8/6 Switched Reluctance Motor is realized based on finite element parametric modeling of the motor. Firstly, the initial design of motor structure parameters is carried out based on the mathematical model of Switched Reluctance Motor, and the simulation model of the motor is built using RMxprt platform, and the debugging of the characteristics of the wide speed range of the motor is finished. Then, the parametric finite element model of the motor is generated, and the stator and rotor pole arc coefficients of the motor are selected as the optimization variables, and the multi-objective compromise optimization of the torque characteristics and efficiency of the motor is carried out by using the Quasi-Newton method weighting method. Finally, the magnetic field distribution, torque characteristics, efficiency and speed range characteristics before and after optimization are compared, proving that the optimized Switch Reluctance Motor can achieve multi-objective performance optimization. The motor designed by this modeling optimization method can improve the requirements of vehicle driving better. [ABSTRACT FROM AUTHOR]

To meet the high-performance requirements of new energy vehicle drive, the optimization design of 8/6 Switched Reluctance Motor is realized based on finite element parametric modeling of the motor. Firstly, the initial design of motor structure parameters is carried out based on the mathematical model of Switched Reluctance Motor, and the simulation model of the motor is built using RMxprt platform, and the debugging of the characteristics of the wide speed range of the motor is finished. Then, the parametric finite element model of the motor is generated, and the stator and rotor pole arc coefficients of the motor are selected as the optimization variables, and the multi-objective compromise optimization of the torque characteristics and efficiency of the motor is carried out by using the Quasi-Newton method weighting method. Finally, the magnetic field distribution, torque characteristics, efficiency and speed range characteristics before and after optimization are compared, proving that the optimized Switch Reluctance Motor can achieve multi-objective performance optimization. The motor designed by this modeling optimization method can improve the requirements of vehicle driving better. [ABSTRACT FROM AUTHOR]

Characterization modules in electric machines and drives design optimization environments typically involve the use of electromagnetic finite element-state space models that require large number of iterations and computational time. It is shown in this work that the utilization of a Taguchi orthogonal arrays method in conjunction with a particle swarm optimization (PSO), search algorithm in a design optimization case study of a synchronous reluctance motor (SynRM) drive, resulted in about 80% reduction of computational time. [ABSTRACT FROM AUTHOR]

A novel hybrid excitation flux reversal machine (HEFRM) is developed. The machine has a simple reluctance rotor and a stator, which has both an ac armature winding and a dc field winding. The core on the surface of the pole arc at the centerline of the stator pole and the core on the outer surface of the stator yoke each have a slot along the rotating axis, where the field windings are placed. A permanent magnet (PM) with opposite polarity is placed respectively on each side of a slot in the same stator pole. In this paper, the working principle of the new HEFRM is introduced, the influence of magnetic pole parameters and armature parameters on motor performance are also analyzed, and genetic algorithm (GA) is used for multi-objective optimization of the torque characteristics. Finally, the HEFRM prototype is built, and its theoretical correctness is verified by the finite element analysis (FEA). [ABSTRACT FROM AUTHOR]

In this paper, a permanent magnet assisted synchronous reluctance machine (PMASRM) with optimized permanent magnet width and asymmetric rotor structure is proposed. A typical PMASRM is selected as the reference motor (Pre-optimized PMASRM). In order to reduce the large torque ripple of conventional PMASRM, an optimization method to design the permanent magnet width is investigated and the Optimized Magnet-width PMASRM is proposed. On this basis, an asymmetric flux barriers structure is proposed to further reduce the torque ripple. Some electromagnetic characteristics including air-gap flux density, no-load back EMF and motor efficiency are examined by Finite Element Analysis (FEA). The simulation results show that the proposed PMASRM can not only decrease the harmonic component of no-load back EMF obviously, but also reduce the torque ripple in steady-state operation, which proves the rationality of the motor structure. [ABSTRACT FROM AUTHOR]

This paper aims at accurately predicting the severe magnetic saturation of a switched reluctance motor (SRM). Firstly, Method I based on the solution of the Laplacian or Poissonian field equation is used to predict the magnetic field in the air gap, but this method is only applicable to the mildly saturated magnetic field. Secondly, Method II based on the winding function theory (WFT) considering the saturation is utilized to predict the magnetic field, which can precisely compute the severely saturated magnetic field. Nevertheless, the tangential magnetic flux density is not considered by Method II. Finally, the synthetic method based on the advantages of Method I and Method II is proposed, which can predict the air-gap magnetic field in SRM having any number of stator slots and rotor poles for any rotor positions. The results indicate that the error of the air-gap magnetic field obtained by the synthetic method is within 5%. Moreover, the radial electromagnetic force and torque obtained by the Maxwell Stress equation are compared with the results computed by the FEM, verifying the effectiveness of the synthetic method. It lays the groundwork for the optimization of torque ripple, vibration and noise of SRM. [ABSTRACT FROM AUTHOR]

The primary objective of this paper was to investigate different stator configurations of switched reluctance motors (SRM) in order to mitigate electromagnetically exited audible noise and vibration. We analyzed natural frequencies of different SRM stator configurations by virtue of modal analysis theory. The three-dimensional numerical modeling of SRM stator geometry was performed by using finite element method. Based on the output results, we propose the solutions on how to select an appropriate stator configuration in order to increase its natural frequencies beyond the resonant operational frequency, and thus, to mitigate the resulting audible noise and vibration. The numerical and analytical results are successfully compared to the published data. [ABSTRACT FROM AUTHOR]

This paper presents an analytical modeling method of optimal control variables to maximize the output power for switched reluctance generators (SRGs) in single pulse mode operation. A method to obtain the phase current equation used to determine the optimal control variables is proposed. The phase current equation is derived from the phase voltage equation in combination with the inductance model. The inductance model proposed in this paper is applied from the flux linkage function. The characteristics of the phase current and the energy conversion relations are analyzed to determine the optimal phase current shape. The analytical results indicate that the optimal shape can be generated when the SRG is controlled with the optimal control variables. The optimal shape is used for analysis based on the phase current equation to determine the optimal control variables. An 8/6 SRG experimental setup is used to validate the proposed method. The optimal control variables obtained from the proposed method are used to control the SRG. Based on the experimental results, the SRG can produce the maximum output power. [ABSTRACT FROM AUTHOR]

A newly designed rotary-linear switched reluctance (RLSRM) motor is presented and electromagnetically analyzed in this paper. The motor has an integrated structure and can control both linear and rotary motions. It is mainly designed to control the engagement of a rotating gear. For this purpose a twosection motor comprised of a rotary and a linear SRM is designed. In the middle part of the motor assembly, a three-phase rotary SRM with 6 stator and 4 rotor poles creates rotary motion. The linear section which is a transverse flux two-phase SRM is composed of two parts placing at each side of the rotary section. The cylindrical translators inside the linear stator poles provide short magnetic flux paths which reduce the core losses and increase the force per volume. The motor parameters derived from the motor design procedure are evaluated using 3-dimensional finite element analysis (3DFEA). The motor performance indices such as flux linkages, flux density, mutual flux, static torque and force for various loads are obtained and assessed for rotary and linear motions. Finally, a comparative study is performed and 3DFEA results are compared with two different RLSRM structures. The comparison shows that the proposed structure has the highest force per motor volume. [ABSTRACT FROM AUTHOR]

This paper exposes two procedures in order to develop a refined analytical model which describes the behaviour of a linear switched reluctance motor. The first approach is based on the flux linkage and the second on the inductance, both versus position and current. Taking into account the non-linearity of the magnetic circuit, models are expressed by either Fourier series or polynomials where the only first three components are considered. Results of these analytical approaches are compared with those obtained using finite element methods (FEM) where a good agreement is observed. [ABSTRACT FROM AUTHOR]

The paper investigates the effect of pole arc skewing in synchronous reluctance machine on its torque ripple. To do this, the machine's reluctances are calculated by using winding function approach (WFA). A numerical-based method is proposed for modeling the machine's dynamic equations. The effect of rotor skewing and the winding type (single-layer or double layer) on the machine's behavior and torque ripple are investigated. The results show that skewing the rotor is significantly effective in double-layer winding case and it is not a proper idea for machine with single-layer winding. The proposed method is capable of studying the voltage-fed machine's behavior which is common in reality in comparison with current source-fed machine. Also, shorter calculation time and capability of studying parameter sensitivity are other advantages of the proposed method in comparison with finite element method (FEM). [ABSTRACT FROM AUTHOR]

The paper investigates the effect of pole arc skewing in synchronous reluctance machine on its torque ripple. To do this, the machine's reluctances are calculated by using winding function approach (WFA). A numerical-based method is proposed for modeling the machine's dynamic equations. The effect of rotor skewing and the winding type (single-layer or double layer) on the machine's behavior and torque ripple are investigated. The results show that skewing the rotor is significantly effective in double-layer winding case and it is not a proper idea for machine with single-layer winding. The proposed method is capable of studying the voltage-fed machine's behavior which is common in reality in comparison with current source-fed machine. Also, shorter calculation time and capability of studying parameter sensitivity are other advantages of the proposed method in comparison with finite element method (FEM). [ABSTRACT FROM AUTHOR]

Multi-objective design optimization environments are used for electric vehicles and other traction applications to arrive at efficient motor drives. Typically, the environment includes characterization modules that involve the use of Electromagnetic Finite Element and State-Space models that require large number of iterations and computational time. This work proposes the utilization of a Taguchi orthogonal arrays method in conjunction with a Particle Swarm Optimization search algorithm to reduce computational time needed in the design optimization of electric motors for traction applications. The effectiveness of the Taguchi method in conjunction with the optimization environment is demonstrated in a case study involving a prototype of a Synchronous Reluctance Motor drive system. [ABSTRACT FROM AUTHOR]

In this paper, a new eccentricity compensation method for Switched Reluctance Machines (SRMs) is presented. In this regard, the dependency of radial force (RF) on variation of number of turns for stator coils and fault level is demonstrated analytically and principle of the new compensation strategy is introduced as well. This strategy is implemented on an SRM utilizing Finite Element Method (FEM) under different fault conditions. This approach is accomplished through switching among the various arrangements in the number of turns for the coils on the stator poles; hence, unbalanced magnetic force (UMF) is controlled without additional auxiliary coils. Simultaneously, regulating the stator currents guarantees the motor torque is not diminished. This comprehensive approach is suitable for different types and structures of SRMs and will compensate or control eccentricities in a wide range of eccentricity faults namely 10%-70% while motor performance is not impaired. [ABSTRACT FROM AUTHOR]

This paper presents a novel three-phase 6/8 external rotor switched reluctance motor. Such a construction not only leads to reduce the total weight and volume, but also increases the total efficiency in a small size motor. Three dimensional finite element method is applied to evaluate the main characteristics of the proposed motor such as magnetic flux density, flux linkage, self-inductance, mutual inductance, and output torque. Moreover, this paper investigates the radial force components of the motor. This assessment is carried out under different forced current levels with the respect to critical rotor positions. From the motor analysis results, it is considered that the proposed motor has great advantages over the conventional type in its magnetic profiles. [ABSTRACT FROM AUTHOR]