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This paper proposes a framework for the design of a coreless permanent magnet (PM) machine for a 100 kWh shaft-less high strength steel flywheel energy storage system (SHFES). The PM motor/generator is designed to meet the required specs in terms of torque-speed and power-speed characteristics given by the application. The design challenges of a motor/generator for this architecture include: the poor...
In this paper, a nonlinear analytical model based on the Magnetic Equivalent Circuit (MEC) method is developed for a double-sided E-Core Transverse Flux Machine (TFM). The proposed TFM has a cylindrical rotor, sandwiched between E-core stators on both sides. Ferrite magnets are used in the rotor with flux concentrating design to attain high airgap flux density, better magnet utilization, and higher...
The magnetizing q-axis inductance of an optimally designed interior permanent magnet machine (IPM) exhibits a saturating behavior as the current excitation increases. This research work proposes an analytical method to study this behavior by expressing armature reaction as the product of stator MMF and flux path permeance function. The path permeance is a function of both the lamination geometry and...
High-specific-power electrical machines are a key enabling technology of electric aircraft propulsion. The machine specific power (power-to-weight ratio) is usually constrained by the thermal and mechanical properties of material. To maximize machine specific power, electrical, thermal and mechanical capabilities have to be considered together. In this paper, an efficient multi-physics model of a...
In this paper, the influence of magnet thickness on the electromagnetic performance of high speed machines is comprehensively investigated. The investigation is carried out based on a conventional 3-slot/2-pole high speed machine with diametric magnetization. Both the finite element method (FEM) and analytical models are used. The rated output torque is fixed when the magnet thickness varies. It is...
A three-phase induction motor emulator based on a six-switch power converter is demonstrated. The conventional model of the induction machine with constant parameters does not represent accurately the performance of this machine with severe transients such as direct online startup and loading conditions. Hence, magnetic saturation effects should be considered. Experimental procedures to determine...
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...
The increase of the phase number of an electric drive is an efficient possibility to enhance its fault tolerance. But not every type of machine is equally suitable for this step. In this work, a permanent magnet synchronous machine (PMSM) with double-layer concentrated windings and modular phase arrangement is proposed for a fault tolerant drive. The coils of the PMSM are interconnected as four three-phase...
The eddy current losses within the permanent magnets are one of the most significant losses in permanent magnet exited synchronous machines. In particular, surface mounted magnets are directly exposed to asynchronous components of the air-gap field caused by either higher harmonic waves or higher time harmonics. Finite element analyses with various higher order formulations show the significant influence...
An autonomous current-sensing system consisting of a SmFe2/PZT/SmFe2 self-biased magnetoelectric (ME) composite and a Fe73.5Cu1Nb3Si13.5B9 nanocrystalline flux concentrator for weak current detection at the power-line frequency is presented and characterized. Giant magnetostrictive material of SmFe2 plate with large anisotropic constant provides a huge internal anisotropic field to bias the ME sensors...
The design of synchronous reluctance machines for high-speed applications is an issue that nowadays remains almost not dealt with. The thickness of the iron ribs that mechanically sustain the structure increases with the rotor speed, so that a high magnetic flux flows through them. Therefore, the available torque decreases with the rated speed required by the application. The aim of this paper is...
This paper deals with the design and test of a Reluctance based Magnetic Lead Screw Power Take Off (PTO) system for a Wave Energy Converter for powering a LED light buoy. In order to meet the power requirement for the LED marking light, measurements of the seastate at the specific location of the buoy is carried out using a special wave measurement buoy. The data is used to set up a simulation model...
The goal of this paper is to propose a model of the (cross-)saturated SynRM suitable for sensorless control purposes, together with an identification procedure suitable for reasonably easy use in the field: the model contains about ten parameters, which are identified from only the drive current measurements, in experiments where the rotor is locked in a known position. The experimental procedure...
This paper presents a comparative study of three types of doubly salient machines (DSMs), i.e. wound field variable flux machines (VFMs), hybrid-excited stator slot permanent magnet machines (HSSPMs), and stator slot permanent magnet machines (SSPMs). Two dimensional finite element (FE) modelling is carried out to investigate the electromagnetic performance of the VFM and the SSPM based on a global...
This paper presents a method to design an optimal brushless DC motor with industrial costs minimization. Within industrial context competitiveness is the main key point while performances must be kept at a high level. An optimization method is proposed to find the best design in this context. It is based on both analytic model of cost and performance of the motor coupled with genetic algorithms. A...
In this paper, the influence of temperature variation on the characteristics and performance of flux-switching permanent magnet (FSPM) machines are analyzed and investigated. The flux linkage, torque output capability, and inductance variation as functions of the temperature are simulated and analyzed. The paper also shows the influence of temperature variation on key FSPM machines performance including...
This paper discusses the post-assembly magnetization of rare-earth permanent magnet materials used in permanent magnet assisted synchronous reluctance motors. Firstly, the motivation behind post-assembly magnetization is given and challenges of embedding pre-magnetized magnets into the rotor flux barriers of synchronous reluctance motors are introduced. Magnetization computation across the magnets'...
This paper presents a simulation model for voltage-fed 3-phase, unskewed, cage-rotor induction machines. The model includes the effects of machine harmonics due to winding distribution, slotting and saturation. The model demonstrates the influence of various harmonic quantities in the machine and calculates respective electrical and magnetic quantities like currents, flux linkages, magnetic field...
This paper introduces a novel linear vernier permanent magnet machine (H-LVPMM) with high force density and low force ripple. The permanent magnets (PMs) on secondary uses Halbach array, which can provide a larger flux density in the air gap than that of the conventional surface-mounted PMs configurations, and the primary is composed of three modules, which are separated by two flux barriers. Moreover,...
The magnet flux linkage to ¿-axis inductance is defined as characteristic current, which is a key factor to determine the Constant Power Speed Range (CPSR) and flux weakening performance of Interior Permanent Magnet (IPM) machines. Therefore, it is critical to predict the accurate value of the characteristic current when considered as an objective or constraint in an optimization process of IPM machines...
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