This paper describes a hybrid method for calculating the performance of coreless stator axial flux permanent-magnet (AFPM) generator. The uses combination finite-element analysis and theoretical analysis. is then incorporated into multidimensional optimization procedure to optimally design large power AFPM measured manufactured prototype compares favorably with predicted results. approach can be applied successfully optimize machine.

In this paper, the performance of air-cored (ironless) stator axial flux permanent magnet machines with different types concentrated-coil nonoverlapping windings is evaluated. The evaluation based on theoretical analysis and confirmed by finite-element measurements. It shown that winding can have a similar as normal overlapping using less copper.

The finite element analysis method is used directly in optimisation algorithms to optimise multidimensions the design of cageless reluctance synchronous machine. Two methods are evaluated minimise or maximise function value. These direction set Powell and quasi-Newton algorithm. Both proved be successful, with some advantages disadvantages. Using these at a power level below 10 kW, results given structures machine which have been optimised according specific criteria. Calculated measured...

Direct drive wave energy converters are attractive due to the elimination of intermediate mechanical power conversion stages. Longitudinal flux (LF) linear generators with iron-cored stators have so far been dominant in experimental direct WECs, but suffer from high bearing loads and unwanted end effects. A novel air-cored topology is presented this paper which eliminates most effects associated LF machines as well attraction forces between magnet translators. The opposing sides translators...

Position sensorless control of reluctance and permanent magnet synchronous machines at zero low speed is possible using HF voltage injection proper demodulation. The so-called saliency position, which tracked by the scheme, different from actual rotor position: difference contains both offset rotor-position-varying components, may be explained carefully considering behavior machine effect that fundamental excitation position have upon it. This paper gives insight into serves as a practical...

In this paper, an investigation into alternative topology for reluctance synchronous machine rotor flux barriers is presented. The investigated employs a high number of barrier variables with asymmetric structure. focus in paper on maximizing average torque and minimizing ripple, using finite element-based design optimization, order to study the possibility achieving acceptably low ripple. A subsequent effect skew proposed optimized reduce ripple even further also conducted, as well...

In recent years, the permanent magnet vernier machine (PMVM) has attracted much attention in research community. Many studies have shown that PMVMs possess superior torque density and are suitable for high-torque low-speed applications. Some of them compared with direct-drive synchronous machines (PMSMs), but these focused mainly on sub-kW power levels. There is little work literature conducted comprehensive evaluation PMVM technology more specific This article presents design optimization a...

This paper presents a hybrid method for the calculation of eddy current loss in coreless stator axial field permanent-magnet (AFPM) machines. The combines use two-dimensional finite element (FE) analysis and closed-form formula. To account three-dimensional effects an AFPM machine, multilayer multislice modeling technique has been devised. Experimental tests are carried out to validate method. It is shown that proposed predicts losses machine with high accuracy.

A new hybrid position sensorless control method for reluctance synchronous machine drives is presented in this paper. The active-flux (AF) and arbitrary injection estimation techniques are combined the first time controller. controller switches between depending on speed load. hysteresis region implemented with phase-locked loop synchronization dynamic stable changeovers estimators. Implementation of AF at high loads allows extended torque capabilities speed.

This paper discusses nonlinear proportional-integral (PI) current control with anti-windup of reluctance synchronous machines (RSMs) for which the flux linkage maps are known (e.g. obtained by FEM analysis or measurements). Due to linkage, dynamics RSMs highly and, so, obtain an (almost) identical closed-loop over complete operation range, controller parameters and disturbance compensation terms must be adjusted online at each sampling instant. The model-based design is derived theoretically...

In this study, constrained multiobjective design optimization (MDO) of wound-field flux switching machines (WF-FSMs) for wind energy drives is undertaken in two-dimensional (2-D) static finite-element analyses (FEA), facilitated by simple analytic formulations. The MDO implementation fully discussed, whereby the simulations two different problem formulations produce Pareto optimal solutions, which enable important considerations. Two candidates, each from problems investigated, are isolated...

The performance of a reluctance synchronous machine in terms torque and power factor depends on the two-axis inductances Ld Lq machine. A finite element analysis method is used to determine these for with normal cross-laminated rotor two flux barriers per pole. By varying dimensions, change difference ratio examined. effect cross magnetisation axis investigated by means measurements an actual barrier pole rotor. measured current-controlled drive also given compared calculated results showing...

Low torque ripple in electrical machines is generally required to reduce acoustic noise and mechanical resonance vibration. To design for low ripple, however, affects the average power rating of machine. In this paper, effect stator winding chording rotor skewing on torque, factor, normal laminated, internal flux barrier reluctance synchronous machine investigated. The two-dimensional finite-element time-step method together with basic equations are used analysis. It shown that design,...

Synchronous machines that are optimally designed using finite-element (FE) software, and control of such powerful digital signal processors (DSPs), commonplace today. With field-orientated control, the maximum-torque-per-ampere strategy for unsaturated voltage conditions (below base speed) is well known; field-weakening strategy, however, could be rather complicated. In this paper, a straightforward torque entire speed range proposed demonstrated. Practical implementation method very simple...

In this paper, the possibility of using an eddy current slip coupling to remove cogging torque and ripple in a slip-synchronous permanent magnet wind generator is investigated. Two different topologies are proposed. It shown that two-dimensional (2-D) finite-element methods inaccurate compared three-dimensional (3-D) when solving currents couplings. The 3-D transient simulations validated manufactured prototype 15-kW coupling. An analytical approximation developed used for design...

Due to the short end windings of nonoverlap winding permanent-magnet (PM) machines, end-winding inductance component is generally ignored in design. In most cases, end-flux fringing effects PMs are also not taken into account. It shown this paper that these have a significant influence on performance parameters machine. paper, several PM machines considered with respect and fringing. A number calculation methods for per-phase compared. new simple analytical method proposed, which give...

In this study, the design optimization of rare-earth-free flux switching machines (FSMs), viz., ferrite permanent magnets (PMs) and wound-fields (WFs), 12-stator slots/10-rotor poles (12/10) 12/14, has been undertaken in finite element analyses for wind generator applications, both small-scale (10 kW) industrial-scale (3 MW) power levels. The focus is on performance feasibility these to replace rare-earth PMs, as well suitability proposed generation. Hence, it found that high torque ripple...

This paper presents an overview of various sensorless control methods, with a focus on dual three-phase permanent magnet synchronous machines (DTP-PMSM). Owing to the important role that DTP-PMSMs play in motion-control applications industry, most academic researchers and industry activists seek reduce costs size while increasing capability efficiency motion applications. has led increase number publications about multiphase recent years. The purpose this article is review techniques, which...