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Based on the fact that the three-phase induction machine proves higher performance under six-phase supply, which was demonstrated in Part 1 of the paper, this work investigates the fault-tolerance capability of the six-phase structure with asymmetrical configuration (30° phase shifting both for space and time conditions). It is taken into discussion the cut-off of one, two and three phases respectively...
A comparative study of a 5 phase PMSG with classical distributed winding and one with fractional slot winding is presented in this paper. Finite element analysis has been used for both models in order to estimate there performances. Two initial conditions have been considered: keeping the same volume of permanent magnet and the same total slots section for stator winding. The main goal was to design...
The paper presents a comparative analysis of a three-phase induction motor that operates connected to the industrial supply system and separately to a six-phase supply source, as well. The design of the electric machine is made in such a way to fit for both situations. The six-phase supply, which is composed of two distinct three-phase systems, was configured for two cases: 30° and 60° phase shifting...
This paper presents the analysis of using segmented permanent magnet instead of single pole units on a synchronous generator. The main reason of using such solutions is the fact that smaller, simple shapes permanent magnets with standardized dimensions can easily be found on the market at low costs.
Design aspects and FEM simulation results of a six-phase induction motor consisting of two three-phase single tooth concentrated windings with a 30° shift between, and an external rotor are presented in this paper. The main goal is to find a suitable candidate for electric vehicle applications which require simplified manufacturing process, reduced fabrication costs, and achieving high efficiencies...
An efficient approach strategy for 3D FEM simulation of a toroidal transformer is presented in this paper. The main goal is to find a suitable solution for toroidal transformers analysis, in terms of achieving more accurate results with less time consuming methods.
This paper presents a FEM-based analysis of two permanent magnet fractional slot machines that have the same stator structure with 9 slots but a different number of rotor poles, which is 8 and 10 respectively. The results have to point out the advantages and drawbacks of each structure. Specific electromagnetic quantities have been investigated such as flux density and back emf, but also cogging torque...
The paper presents the design and FEM simulation of a novel induction motor intended as a specialized drive for electric traction and/or airborne propulsion applications. Several particular requirements related to the size, weight and dynamics did rise non-conventional challenges and therefore a less-than classical approach have been considered. The proposed solution consists in a combination of an...
In this paper a special electric transformer which allows achieving multiple polyphase systems (two-phase, five-phase and six-phase) from the three-phase power grid, using different connection schemes, is presented. The purpose of such an electric transformer is to offer the possibility of easily obtain different multiphase electric systems from the available three-phase power system, in electric...
This paper presents the analysis of a 9/10 poles BLDC machine during steady state and start-up operation. Due to the asymmetrical construction the coupling between Flux 2D and Simulink is used to analyze the start-up operation.
Low power induction machines usually have the drawback of low efficiency and power factor. Line-start permanent magnet synchronous machines represent a good candidate at replacing them in constant speed applications. This paper presents the results obtained using a finite element analysis software package. The study aims to present the load-start performances and the generator capabilities of a 3...
The new efficiency standards impose high values for efficiency and power factor even for low power electric drives. This paper presents a low power permanent magnet synchronous machines derived from a brushless direct current machine. The machine has a asymmetrical construction used in BLDC construction, but the interest was to apply this type of construction to a permanent magnet synchronous machine.
This paper presents the study of a synchronous reluctance motor with skewed rotor cage using finite element analysis (FEM). The study begins with a few introductory aspects regarding the operation of this type of motor. Then the characteristics of the studied motor are introduced and a relatively new method of determining the d- and q-axis inductances using FEM is presented. Afterwards a series of...
This paper presents a complex study of the performance developed by an outer rotor induction motor with multipole stator winding. The novelty of the proposed structure consists in the replacement of the regular lap winding with a ring type one, which allows a higher flexibility in changing the number of pole pairs. The purpose is mainly to obtain a superior torque capability by changing the synchronous...
The synchronized operation mode of the three-phase induction machine (synchronized induction machine — SIM) can be equated with a three-phase wound-rotor induction machine that operates under unbalanced duty. In this case, the SIM is analyzed by means of first order differential equations that contain nothing but total fluxes and the rotation angle as variable quantities. It is about an equation system...
This paper presents the control of a 6/4 variable reluctance machine, without any rotor position sensor. The energizing of each of the three stator phases of the machine is done by means of sinusoidal AC power supplies. The nominal frequency is 50 Hz. Two main cases were considered for this purpose. The first one implies AC voltage sources and the other one refers to AC current sources. The situations...
Current researches take into account obtaining of sinusoidal waveforms corresponding to the voltages provided by wind generators, for use in domestic applications and beyond. This paper analyzes the performances obtained by design and simulation of a permanent magnet synchronous generator with a specialized software package that uses FEM (Finite Element Method). A low speed three phase generator with...
This paper presents the modeling and simulation of an axial field, single-pole, single-phase switched reluctance motor. The analysis starts with a 3D FEM-based simulation, which has as main purpose the determination of magnetization and torque characteristics. Then, the obtained data are implemented in the mathematical model built in the Matlab/Simulink environment in order to simulate the dynamic...
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