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Vernier permanent magnet (VPM) machines have gained growing interest in recent years due to several advantages, including high torque density and simple mechanical structure. This paper presents a thorough investigation on the nature of fractional slot vernier permanent magnet (FS-VPM) machines with regular stator topology. Through analytical derivation, the configuration and performance of two winding...
Transverse Flux Machines are attractive for a number of applications where a high torque is required at a relatively low rotational speed. A typical drawback of motors of this type is a high cogging torque in relation to the overall torque output of the motor, this leads to a high torque ripple which can cause unwanted noise and vibration. A number of techniques have been developed that reduce this...
The paper aims at the feasibility assessment of an innovative rotating to linear motion magnetic converter incorporating a gearing function for short distance and low capacity electric transport applications. The contact-less transmission of the mechanical power due to the interaction of two on-board sets of permanent magnets (PMs) enables more efficient and reliable operation with respect to conventional...
The recent novel DC biased sinusoidal current reluctance machines (DC-biased VRMs) are similar to switched reluctance machines (SRMs) in terms of structure, as they both adopt the doubly salient structure and concentrated windings. However, the special characteristic of DC-biased VRMs is that their phase currents have both DC current and AC current. Therefore, it can be inferred that the vibration...
Accuracy of system simulation for hybrid vehicle development is key when estimating the real energy saving that can be expected from a new technology. In case of claw pole machine, it becomes a challenge when we have to integrate in the simulation platform the actual control laws of the electrical machine, its self heating and the impact of the electrical network. A combined mapping and analytical...
This paper presents the innovative design of an air cooled permanent magnet assisted synchronous reluctance machine (PMaSyRM) for automotive traction application. Key design features include low cost ferrite magnets in an optimized rotor geometry with high saliency ratio, low weight and sufficient mechanical strength as well as a tailored hairpin stator winding in order to meet the demands of an A-segment...
This paper presents a non-linear analytical model of a multi-V-shape Interior Permanent Magnet (IPM) motor with non-overlapping concentrated winding. The model relies on Maxwell equations to compute the flux density in the different parts of the motor. This article proposes a saturated analytical model of the stator and the rotor. The analytical model is used to calculate the average torque, the power...
Conformai mapping is a widespread mathematical technique to approach the electromagnetic study of electric machines. In its practical application, however, it is relatively easy to incur in errors which make results unreliable. In this paper, some fundamental but possibly deceitful facts in conformal mapping application are described, focusing in particular on: energy conservation in magnetostatic...
This paper deals with electrical parameters identification of multi-winding induction motors. In particular, the study has been focused on electromechanical systems consisting of multiple three-phase stator winding sets sharing a common rotor. The stator units composing the system coupled to the power converters, measure systems and control units represent an integrated multi-drive system whose dynamic...
Cogging torque produces negative effects in Permanent Magnet Synchronous Machines (PMSMs) such as vibrations, noise and position control inaccuracy. Its impact can be worse due to magnetic saturation when the machine is loaded, increasing its amplitude and causing the magnet or stator slot skew to be ineffective. This paper deals with the study of these phenomena combining a Permeance Network Model...
This paper shows that axial flux motors are compact, torque dense, efficient replacements for radial flux fractional horsepower motors. A commercially available radial flux fractional horsepower motor is used as baseline for design of its axial flux counterpart. The torque density and losses of the radial and axial flux motors, with identical permanent magnet utilization factors, are compared with...
This paper investigates the influence of magnetic saturation on the rotor bar current waveform and performance characteristics of a squirrel-cage Induction Machine (IM). The levels of iron saturation in different parts, including stator and rotor back iron, tooth body and tooth tips etc., are examined and their influences are investigated, while the dominant part which causes the non-sinusoidal rotor...
Direct and soft starts of squirrel-cage induction motor are considered. Operation specificity due to nonsinusoidal supply voltage and equivalent circuit parameters changes due to variable voltage magnitude and frequency as well as magnetic circuit saturation and current displacement in rotor winding are studied. Consumed energy calculations show advantage of frequency converter start. Mathematical...
This paper presents a time-efficient transient numerical method for three-dimensional analysis of rotor losses in a three-phase 2-pole high-speed permanent-magnet synchronous machine. The motor has axially stacked ring shaped permanent magnets (PM). The influence of shaft material properties on rotor harmonic losses and loss distribution between the rotor shaft and magnets is investigated in the frequency...
Induction motors are usually well modeled with 2D finite element method. Nevertheless the result is very sensitive to the end ring resistance value. The paper describes different methods to determine a squirrel cage end ring impedance of induction machine. Starting from analytic formula, through 2D axisymmetric computation until 3D computation with finite element software, the impedance is obtained...
The paper presents the simulations of influence of a shaft of induction motors on the magnetic field distribution and the resultant magnetizing current. Motors are supplied from mains at 50 and 200 Hz. For that calculations, field-circuit and analytical methods are used, taking into account the nonlinear phenomena. The results show a significant increase in magnetizing current for two-pole motor concomitant...
Direct-on-line synchronous reluctance motors (DOLSynRM) combine the characteristics of the induction motor (IM) and the synchronous reluctance motor (SynRM). Saturation of core materials, the eddy currents, and the asymmetry of the rotor core and cage make it difficult to predict to which kind of loads the motor can synchronize. In this paper, the DOLSynRM start-up is analyzed with a magnetic field...
In this paper, the validation of a set of parameters of a 97MVA, 50Hz, 10.3kV hydro generator obtained both by simulation from finite element analysis and by experimentation from the no load curve and the short-circuit test is investigated. As each parameter of the synchronous generator determination involves some inaccuracy due either to the methods used or to the processing of the test data, a comparison...
We have proposed a variable flux reluctance motor that requires only a set of coils for both the armature and DC-field currents. In this paper, the speed-torque characteristics of the motor are compared with those of IPM, switched reluctance and induction motors in terms of the power band. In addition, the phase current and motor efficiency are compared and discussed.
The proposed numerical model is used to study the physics of inter-bar currents by investigating the three dimensional field solution. The long-term aim is to get a deeper and more accurate understanding of the physics to be able to further fine tune analytical theories about inter-bar currents. This work is used to verify the model and to get an idea of what can be achieved with it in the future...
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