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This paper investigates a novel harmonic current injection method to optimize air-gap and yoke flux density distribution for multiphase motor simultaneously. The effect of harmonic currents on air-gap flux density and yoke flux density is analyzed as a whole. The proposed method fully makes use of multiple control freedoms, and the optimal coefficients for corresponding harmonic current are derived...
In this paper, a high energy efficiency control strategy for electric power generation with synchronous reluctance machine (SynRM) is proposed. This kind of machine is gaining attraction in various fields of application due to its high efficiency, compactness and the capability of operating over a wide speed range. These features are highly desirable for generators especially those that operate from...
This paper proposes a new motor with stator magnet using the magnetization reversal technique. The proposed motor has a magnet which has a small coercive force in the stator tooth. In this motor, a pulse current is added to stator magnet to change its magnetized direction. Then the stator magnet becomes a magnetic pole, and the motor is driven by generating an alternating magnetic field by the stator...
Brushless doubly-fed induction machines have great potential as variable-speed generators in wind turbines. Undesired space harmonics exist because the special rotor needs to couple both stator windings which with different pole-pair numbers and different frequencies. These undesired space harmonics lead to a bigger torque ripple compared with conventional induction machines. Previously, a 2D multi-slice...
In the maritime industry, the use of pod propulsion system has been strengthened not only for the cruise ships but also in other type of vessels. Several studies have been performed in order to investigate power quality issues and system failures when pods are used. In this paper, a systematic approach has been developed in order to investigate pod propulsion from the electrical point of view. The...
This paper deals with a new concept of winding segmentation of permanent-magnet synchronous machines originally presented in a recently published patent. Called, in this paper, the coupled star winding, this new segmentation winding allows reducing total loss and current ripples when fed by an interleaved parallel inverters. This segmentation method can potentially integrate the functionality of magnetically...
In this paper, the identification of equivalent circuit parameters of a doubly-fed induction generator (DFIG) is investigated. To date, several methods have been presented to identify or estimate induction machine (IM) parameters by using IEEE Std. 112. However, for accurate results using this standard, adjustments according to the machine's design are required. This paper presents adjustments for...
Finite element analysis of electrical machines with multi-conductor windings can be computationally costly. This paper proposes a solution to this problem, using a reduced basis approach. The field-circuit problem is first solved in a single slot only, with a set of different boundary conditions. These pre-computed solutions are then used as shape functions to approximate the solution in all slots...
This paper presents a novel axial vibration suppression method in two-axis actively positioned permanent magnet bearingless motors. Only radial x and y directions are actively positioned. The axial z and tilting θx and θy directions are passively stabilized by magnetic attraction force between the stator core and rotor permanent magnets. Therefore, damping force is not generated in the axial and tilting...
This document provides design guidelines for bearingless permanent magnet synchronous motors (PMSM), which generate torque and lateral suspension forces via two separate poly-phase windings. The step-by-step bearingless motor development process is accompanied by explicit analytical formulas used in the dimensioning of the magnetic circuit and in the calculation of magnetic field quantities like flux...
High torque density and robust rotor structure outer-rotor switched flux permanent magnet (SFPM) machine with DC excitation is proposed for emerging candidates to replace conventional electric motor of direct drive electric vehicle (EV). The extraordinary of DC excitation coil provides higher generated flux and flux control capability that suitable for various operating conditions. With the concept...
We propose a novel variable-field machine with toroidal windings to achieve both miniaturization and high efficiency. The proposed machine is characterized by a structure that uses three-dimensional magnetic flux to increase the number of torque-generation faces. The three-dimensional structure prevents an increase in the machine volume due to the addition of variable-field coils. We investigated...
The ongoing miniaturization trend of electric machines demands for higher rotational speeds to provide a required power level at decreased size. The goal of this project is to push the limits of miniaturization by researching new concepts for bearingless machines with ultra-high rotational speeds exceeding 25 million rotations per minute (Mrpm). The employed sub-millimeter size spherical solid steel...
Flux switching permanent magnet machines provide many advantages. Due to their superior behavior associated with sinusoidal Back-EMF and low torque ripple, topologies featuring 12 stator teeth and 10 rotor poles (12/10) are favored. However, this follows that for a given mechanical rotor speed, the required electric fundamental frequency is ten times to that of a conventional two pole PM machine imposing...
One of the major issue nowadays is a global warming or better known as the greenhouse effect wherein carbon dioxide emissions are identified as one of the main cause. Whilst, the combustion of fossil fuels in transportations has been identified as one of the major contribution to cause the large amounts of carbon dioxide being released into the atmosphere. Consequently, an interest in electric vehicles...
Diverse topology of three-phase and single-phase Field Excitation Flux Switching Machines (FEFSMs) that have been developed recently have several advantages such as variable flux capability and the single piece structure of rotor suitable for high-speed applications. However, overlap windings between armature and Field Excitation Coil (FEC) have caused the problems of high end coil increased size...
Due to the nature of salient poles in both stator and rotor, flux-switching permanent magnet (FSPM) machines typically suffer from severe torque ripples, causing undesired acoustic noise and vibration, especially at low speeds. As one of the main sources of torque ripples, harmonics in phase back electro-motive-force (EMF) should be suppressed as much as possible in order to produce smooth torque...
Flux Switching Permanent Magnet machines have attracted considerable attention due to their simple and robust structure, easy heat dissipation, high torque densities and suitability for high-speed operations. To enhance these proprieties, we present in this paper an analytical model for prediction of the magnetic field for a 3 phase, 12 stator slots and 10 rotor tooth (12/10) flux switching permanent...
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