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This paper investigates the torque production and the torque ripple reduction of 6-stator/7-rotor-pole (6/7) variable flux reluctance machine (VFRM). Based on the harmonic analysis, the instantaneous torque equation is firstly derived by considering the spectra of the armature inductance and current. The average torque is found to be mainly produced by the mutual inductances between the field and...
The synchronous inductances of permanent magnet machines are usually measured by means of off-line measurements based on single-phase connection schemes of the three-phase windings. Through experiments and comparative analyses with respect to the three-phase symmetrical supply case, it has been observed that the results obtained for the inductance measurement is dependent on both the winding connection...
This study investigates the effect of different skewing methods and angles for switched reluctance machines (SRM) having high pole count using multiphysics simulations. A 24/16 SRM is modeled for each skewing method and different skewing angles using 3D electromagnetic finite element analysis (FEA). Mechanical and acoustical analyses are performed to evaluate the effectiveness of different skewing...
In this paper a prototype brushless doubly-fed reluctance machine is investigated which is aimed a meeting commercial machine performance figures. The machine has 4 and 8 pole 3-phase stator windings and a 6 pole radially-laminated ducted rotor. The machine is investigated using finite element analysis (FEA), static torque tests with DC current excitation, a MATLAB/Simulink model, and experimentally...
This paper proposes an analytical method to quantify the effects of current and position sensor errors on torque ripple of a switched reluctance machine (SRM). First, an instantaneous torque equation for SRM is derived using the Fourier series representation. Then, analytical models are developed to describe the non-idealities of current and position sensors in the drive system. The electromagnetic...
Ultra-high speed switched reluctance machines (SRM) are becoming more and more promising due to its robustness and simple geometry. This paper proposed a detailed design procedure for an ultra-high speed SRM, including dimension calculation, material selection, winding selection, windage torque calculation, drive system and control strategy. The ultimate goal is to build a machine that is electromagnetically...
This paper presents the computer simulation of a switched reluctance machine (SRM) operating as a generator proposing an alternative for the representation of the inductances of the machine coils and their respective rates of variation. The simulation results show the reliability of the proposed model, especially in comparison with other models of machine inductance representation. The validation...
The greatest progress is observed in variable speed AC electric drives. The article presents principles and approaches to the synthesis of structures and parameters of corrective connections of AC electric drives with field regulated reluctance machine. It is shown that the quality of the control parameters depends on the conditions for setting the internal regulation loop of the electromagnetic torque...
The cogging torque of variable flux reluctance machines (VFRMs) is usually large, which will result in undesired vibrations and acoustic noises. This paper introduces several methods to reduce the cogging torque of VFRMs including asymmetrical rotor teeth, circumferential rotor teeth pairing, rotor teeth shaping and rotor dummy slots. First, the cogging torque of VFRMs are analytically calculated,...
Following publication considers synchronous reluctance machine with increased number of phases. The main goal of this research is to investigate the alternative solutions to the existing and well-known 3-phase electrical machines. In particular, a 5-phase reluctance machine with concentrated stator winding is briefly mentioned and a 42-phase electrical motor equipped with stator solid bars is shown...
This paper proposes a novel 16/10 segmented rotor switched reluctance machine (SSRM) for belt-driven starter generators (BSGs) of hybrid electric vehicles. The stator of proposed SSRM consists of two types of stator poles: exciting pole and auxiliary pole, and the rotor of proposed SSRM is made up of a series of discrete segments. Firstly, the concept of the conventional SRM and proposed machine is...
This paper presents a performance comparison of feedback linearization and field oriented control for a synchronous reluctance machine. In order to represent realistic drive performance and dynamics, look-up tables of the machine inductances as a function of currents are used to include saturation effect. Additionally, a trained neural network was implemented to take the nonlinear behavior of the...
This paper presents an identification method and modelling technique which is able to characterise the complete nonlinear cross-coupling electromagnetic flux-linkage model of a synchronous reluctance machine as a function of the direct- and quadrature axes currents within a few seconds. The presented approach is suitable for identification of the self-saturation flux-curves as well as the cross-coupling...
The article proposes an adaptive control approach that is capable of compensating for model uncertainty and parametric changes of the doubly-fed reluctance machines (DFRMs), as well as for the lack of measurements about the DFRM's state vector elements. First it is proven that the DFRM's model is a differentially flat one. By exploiting differential flatness properties it is shown that the DFRM model...
Ultra-high speed machines are gaining popularity in more and more applications. Switched reluctance machines (SRMs) are very competitive candidates for ultra-high speed applications due to its single material rotor. However, the conventional rotor geometries of SRMs are not suitable for ultra-high speed applications. This paper presents a novel rotor design for ultra-high speed SRMs over 1 million...
The maximum speed of ultra-high speed switched reluctance machines (SRMs) is limited by commercial rotary encoders due to mechanical considerations. In this paper a novel direct position control for ultra-high speed SRMs based on non-contact optical sensors is proposed. The paper presents the use of reflective optical sensors to detect the relative position between the rotor and the stator so as to...
Current industrial trends show a growing interest for variable speed drives, energy efficiency and environmental sustainability. Synchronous Reluctance Machines (SynRM) and Permanent Magnet assisted Synchronous Reluctance Machines (PMaSynRM) can fulfill these requirements with proper designs. This paper provides a machine design of a PMaSynRM for saliency based sensorless control. A detailed approach...
In this paper, an analytical model in the dq reference frame is developed to recognize the steady-state of the self-excited reluctance generator, considering no-load and resistive load conditions. A fast method to estimate the minimum capacitance requirements is proposed. Experiments are carried out to verify the analytical results. After that, attention is paid on the capability of self-excitation...
Variable flux reluctance machines (VFRMs) are permanent-magnet-free three-phase machines and are promising candidates for applications requiring low cost and robustness. This paper studies the torque ripple and minimization methods for 12-stator VFRMs. Starting with the analysis of harmonics in the self and mutual inductances of field and armature windings, instantaneous torque equations are derived...
The absence of field excitation on the rotor of the synchronous reluctance machine, results in poor power factor and low power density when compared to permanent magnet synchronous machines. To mitigate these problems, permanent magnet assisted synchronous reluctance machines were introduced. The inserted permanent magnet boosts the machine's power factor and enhances its power density. In this paper...
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