Various techniques exist for reducing the cogging torque in radial-flux permanent-magnet (RFPM) machines. However, although some of these can be applied to axial-flux PM (AFPM) machines, additional manufacturing complexity and cost may prohibitive. Therefore, alternative low-cost are desirable use AFPM In this paper, utility employing minimization that have been developed principally RFPM machines is examined by 3-D finite-element analysis, several proposed.

In this paper, pulsating torque components of permanent magnet machines and minimization techniques are discussed for axial flux surface-magnet disc-type PM machines. The analysis describing general instantaneous electromagnetic equation ripple factor is briefly provided in order to analyze component. Detailed finite-element analyses focusing on the cogging using several also given. A detailed comparison two illustrated paper.

This paper presents the design, analysis, control, and experimental evaluation of an innovative field-controlled axial-flux surface-mounted permanent-magnet machine. Topology design equations, as well optimized study, are attained. The machine is investigated in detail using finite-element a prototype built. In order to evaluate new axial flux topology, system setup devised discussed. results comparison between analysis test also presented.

Although three-phase permanent magnet (PM) motors are dominant in industry, multi-phase PM synchronous present higher torque-to-weight ratios, better efficiency, and low torque ripple compared with conventional motors. These features make fault-tolerant become attractive for safety-critical applications. In this paper, a novel motor design dual asymmetric stator winding is proposed. The structure of the proposed unconventional due to selected slot-pole combinations. Therefore, an needed....

This paper presents a new axial flux surface mounted permanent magnet (PM) field controlled TORUS type (FCT) machine. Machine structure and principles are explored the weakening feature of topology as well advantages machine presented in first part. The second section introduces linear model sizing analysis using generalized equations. Optimization pole number power density maximization for optimum is also achieved. In third section, 3D finite element analyses (FEA) illustrated different...

Axial flux permanent magnet (AFPM) motors are frequently used in many applications. gap coreless with surface-mounted magnets the most noteworthy ones due to their potentially higher efficiency and smaller axial length. In this paper, a new spoke-type AFPM disk motor dual rotor single stator is proposed sinusoidal segments. This disk-type an interior PM (IPM) variable air obtain back Electro-Motive Force waveform. It shown that it possible increase air-gap density AF-IPM torque output...

Although three-phase permanent magnet (PM) motors are quite common in industry, multi-phase PM used special applications where high power and redundancy required. Multi-phase offer higher torque/power density than conventional motors. In this paper, a novel consequent pole (CPPM) synchronous motor is proposed. The constant power-speed range of the proposed wide as opposed to design detailed finite-element analysis nine-phase CPPM performance comparison with surface mounted completed...

A new flux-assisted consequent pole spoke-type permanent magnet (PM) synchronous torque motor is proposed in this paper. The has fractional slot structure with a rotor geometry and magnets. Initial design, design optimization, detailed 2-D 3-D finite-element analyses (FEAs), structural thermal simulations are all carried out. prototype built tested. optimized validated by 2-D/3-D FEA experiments compared the reference conventional surface PM (SPM)-type motor. results indicate that higher...

Multi-phase permanent magnet (PM) motors are becoming more popular because of their higher torque densities, enhanced efficiency, and fault-tolerant capabilities. In this paper, a novel six-phase PM synchronous motor with new asymmetric stator ac winding scheme placement is proposed. Two identical dual three-phase asymmetrical sets placed in two separate half the 180 mechanical degrees. This approach reduces phase resistance thus copper losses. Torque quality proposed also analyzed using 2-D...

In this paper, a new asymmetric planar V-shaped magnet arrangement for linear PM synchronous motor is proposed. Several arrangements the track of proposed permanent (PM) such as un-skewed magnets, conventional skew, and magnets have been investigated. The performance results with skewed are compared to those previously designed rectangular-shaped (CuSRS) magnets. forcer kept same all structures thorough comparison provided low detent force ripple CuSRS skew approaches.

Analysis of electromagnetic vibration and acoustic noise assessment methods to minimize resultant sound power level for low motor design is presented in this paper. The linear model the exciting force wave derived evaluate optimize stator winding, rotor PM shape skew angle minimization design. Mode number frequency wave, natural frequency, maximum velocity displacement main source are introduced machine vibration. Resultant levels cylindrical plane models analyze both axial radial flux...

In this paper, improvement of torque quality and magnetic losses a concentrated winding high-speed permanent magnet (PM)-assisted synchronous reluctance motor (PMaSRM) that can operate in the wide speed range are investigated. Optimization studies have been carried out to enhance quality. addition, ac copper stator coils iron laminations at high frequencies Since PMaSRM constant power-speed range, field weakening performance has also The results both no-load on-load conditions examined by...

Conventional coreless linear permanent-magnet (PM) synchronous motors have been used commonly in various applications industry. In this article, double-sided PM motor design alternatives are proposed with a novel track structure less magnets. A conventional (PMLSM) is provided as benchmark. Detailed 3-D finite-element analysis simulations for the new structures presented data. thorough performance comparison also presented. prototype of promising built and tested. It shown that data test...

Nonslotted and slotted external rotor internal stator TORUS type surface mounted permanent magnet (PM) machines (TORUS-NS TORUS-S) have simple structures, relatively high efficiencies low cost. These can be used for the applications that require power torque density, efficiency noise with use of neodymium-iron-boron (NdFeB) magnets providing small overall size weight. In this paper, sizing equations are derived using generalized equations. The optimum machine design is illustrated by...

A novel machine family-dual-rotor, Radial-Flux, Permanent-Magnet (RFPM) machines-has demonstrated that it can substantially improve torque density and efficiency. The objective of this paper is to provide a performance comparison between two major alternatives technology: Surface-mounted dual-rotor RFPM machines Axial-Flux (AFPM) machines. accomplished at four power levels ranging from 3 50 HP constant speed 1800 RPM. includes material weights costs, copper iron losses per unit active...

A variety of techniques exist for reducing the cogging torque conventional radial flux PM machines. Even though some these can be applied to axial machines, manufacturing cost is especially high due unique construction machine stator. Consequently, new low are desirable use with This paper introduces a minimization technique multiple rotor surface magnet motors. First, basic principles explored in this paper. 3-kW, 8-pole surface-magnet disc type double-rotor-single-stator then designed and...

Cogging torque component is one of the key issues in design radial and axial gap permanent magnet motors geometry position magnets plays a critical role this process. This study presents influence asymmetry minimisation cogging for flux (AFPM) disc motors. techniques, such as skewing shifting or groping are examined detail by using three‐dimensional finite element analysis with various types alternatives since shaping positioning low cost approaches to minimise eliminate component. A...

Three‐dimensional (3D) finite element (FE) modelling of axial flux permanent magnet (AFPM) motors is one the time‐consuming tasks which must be completed before manufacturing prototype motor. A simple, fast, accurate, and effective numerical approach for such 3D problems would particularly useful researchers. This study presents simple 2D FE approaches AFPM with good accuracy less computational effort. The are based on a number models or planes inner rotor, outer linear motor topologies. All...

This article proposes an analytic coupled magneto-thermal analysis of axial-flux (AF) permanent-magnet-assisted (PMA) eddy-current brake (ECB) at high-temperature working conditions. In the topology investigated, permanent magnets (PMs) are placed into stator slot openings to increase braking torque production capability. modification enables control magnet flux by altering dc excitation current. However, utilization PMs will make construction vulnerable high operating temperatures simply...

This article proposes a new magnet step-skew approach for surface mounted permanent (PM) motors in order to reduce the cogging torque and pulsations as well increase output quality. The proposed based on semi finite element analysis (FEA) relies varying both length of segments angle between rotor segments. method targets optimize skew so achieve minimum opposed conventional which are kept same. Semi-2D-FEA simulations with an optimization algorithm completed attain optimum geometries angles....

Two different external-rotor-internal-stator TORUS type axial flux PM machines can be derived based on the direction of flux. In first machine, magnet driven enters stator and travels circumferentially along core while, in second type, axially machine axis rotation. The major differences between two topologies are flux, winding arrangement thickness yoke. this paper, sizing equations for both types machines. Based analysis, optimum design is achieved minimum ripple torque maximum density....

Several cogging torque minimization techniques exist for permanent magnet (PM) machines, and these are well documented in earlier studies. However, the majority used to reduce radial flux PM (RFPM) machines. In this paper, axial-flux (AFPM) disk machines briefly reviewed, one of foremost method, skew, is examined detail. Various skewing methods, types, effects on machine performance also investigated. The results compared with a reference AFPM machine, improvements demonstrated.

In this paper, a novel dual-rotor axial-gap flux-switching permanent-magnet machine with dc excitation winding is proposed. First, the topology and operation principles of proposed are clarified. Basic design equations parameters provided, electromagnetic analyses 3-D FEA performed. Parametric optimizations using completed for different excitations. A prototype manufactured, tested, validated. It shown that air-gap flux can be controlled in wide range compared to conventional surface magnet machines.

This study presents design, analysis and real time dynamic torque control of a single‐rotor single‐stator axial flux (AF) eddy current brake (ECB). Design the AF‐ECB is accomplished based on magnetic equivalent circuit (MEC) modelling. Influence key design parameters braking including permeability resistivity disc material also investigated. Braking profile obtained by MEC modelling numerical analyses are carried out three‐dimensional (3D) finite element (FEA) to validate obtain profile. 3D...