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Diagnosis of induction motors in industrial facilities is crucial to avoid unexpected outages that may lead a huge economic losses. Hence, this field has attracted a rising interest, in order to improve the accuracy of the fault diagnosis and to extend it to a growing number of different types of faults. Over the last decade, and recently, new diagnosis methods have being proposed in the technical...
The analytical equations for the conventional induction machine are derived in a form ready to be applied for modelling its operation at a voltage source inverter with constant DC link voltage. The equations concern the space vectors for the stator flux linkage and the stator current. The speed is considered as constant within a given short time. It is shown, that the common differential equations...
A new axial field hybrid excitation synchronous machine (AFHESM) with shunt rotor type is proposed for wind turbine applications. The architecture, material properties, operation principle of the AFHESM are introduced. Considering the directions of flux, 3D models of the AFHESM are investigated. Finite element analysis (FEA) is used to compute airgap flux density and the control performance of the...
Stator-PM small motors are currently proposed for residential, automotive, info gadget actuators to decrease PM temperature effects and keep high performance, for lower cost, by using Ferrite-PMs and (or) aluminum stator windings. Single-phase stator-PM small motors did not receive sufficient attention for powers below 100W in general. The present paper characterizes a single phase two-pole Ferrite-PM...
A novel partitioned primary linear switched flux PM machine (LSFPMM) is investigated, which take armature and permanent magnet poles as each side of primary respectively. The new structure makes both armature and magnetic poles have more space, so that the over-saturated problem of conventional LSFPMM is solved. However, the end effect also becomes different due to both armature and magnetic poles...
This paper investigates the design of alternative permanent magnet linear machines for use as the generator in a free piston engine. All of the machines are of a modulated pole structure with three dimensional flux flows. In transverse flux machines such as these, the current flows in a different plane to the flux path, eliminating the usual conflict between electric and magnetic loading. For a linear...
Fault-tolerant flux-switching permanent-magnet (FT-FSPM) motor incorporates the merits of high fault-tolerant capability and high torque density. In order to evaluate the fault tolerant ability of two FT-FSPM under open circuited fault, two remedial current methods were proposed. Namely one is based on equal current amplitude, and the other is to minimize the stator copper losses. The principle of...
This paper presents design feasibility studies, analysis and optimization of nonoverlapping wound-field flux switching machines (NWFSM) with non-rare-earth magnet for the electric propulsion of an all-electric boat. The initial structures and design characteristics of NWFSM are discussed and compared with existing permanent magnet synchronous machine (PMSM). Since, the initial designs fail to achieve...
In this paper, electromagnetic performances of twelve-phase 24-stator-slot redundant switched flux permanent magnet (SFPM) machines with 20-, 22-, 26- and 28-rotor-pole rotors are analyzed. The influences of key design parameters on the open-circuit electro-motive-force (EMF) and cogging torque are comparatively evaluated by 2D finite-element analysis (FEA). FEA results show that the 24/26 SFPM machine...
This paper presents a new multiphysic model and simulation environment for the fast calculation and analysis of acoustic noise and vibration levels due to Maxwell forces in variable-speed rotating electrical machines. In the first part, some numerical methods for the prediction of electromagnetic noise are analyzed and compared to analytical or semi analytical techniques. In the second part, a new...
A method for measuring the specific losses and magnetostriction of grain-oriented electrical steel coils up to six tons is presented. Since transformer core manufacturers are mainly supplied with entire steel coils, a fast incoming goods inspection is desirable. The proposed method identifies the specific losses at certain flux densities of the entire steel coils. In addition, the magnetostriction...
This paper investigates the application of Fibre Bragg Grating sensors for thermal hot spot temperature monitoring of random wound electric coils. The paper first presents the design, installation and in-situ characterisation details of a thermal sensor used for enabling thermal monitoring in the centre of the wound coil structure, in close proximity to the thermal hot spot location. A number of thermal...
The present paper presents the preliminary design with key FEM validation for a high performance IPMSM capable of 12/1 (500–6000 rpm) constant power (150 kW) speed range (CPSR) based on using mechanical flux weakening (MFW) by rotating magnets on the rotor, capable to reduce PM airgap flux to zero or even changing its polarity when needed. The efficiency is basically constant (over 94%) over the entire...
This paper presents a modified design approach as well as a practical and effective neural network efficiency estimation procedure of a permanent capacitor single-phase induction motor (SPIM). The standard industrial motor frame sizes along with the current design trends of larger lengths and smaller diameters are taken into account, which are not likely presented in literature. In this context, a...
In this paper, an electric bicycle motor design study is presented according to the related standard. Fundamental dimensions and characteristics are kept within some certain boundaries by means of motor rated power and physical constraints arising from standard bicycle sizes available on the market. Slot/pole ratios and winding configurations are investigated comprehensively in order to obtain a proper...
The performance of an axially laminated synchronous reluctance motor is calculated by considering the magneto-mechanical interaction on the electrical steel sheets. The elasticity analysis is performed with 2D finite element method for centrifugal force and shrink-fittings in both the stator frame and the rotor shaft. The 2D magnetostatic analysis is formulated with a mixed formulation involving the...
The magnetic properties, namely the iron losses and the relative permeability, of SiFe electrical steel laminations after mechanical and laser cutting are studied. Mechanical cutting with guillotine shears and cutting by means of fiber and CO2 lasers are considered. The magnetic measurements are conducted on the Epstein frame for frequencies of 50, 100 and 200 Hz. The specimens also include Epstein...
Electrical steel sheets of motors and generators are usually shaped to the final form by punching. The punching and other cutting processes generate large plastic deformations and residual stresses. These are known to deteriorate the magnetic properties of the edge region. However, the characterization of this deterioration in the form of magnetic properties is missing. The main aim of this paper...
In this paper, a detailed geometry analysis of the rotor structure is presented, for both synchronous reluctance and PM-assisted reluctance motor, in order to suggest an automatic procedure to draw the rotor structure. The shape of flux barriers is selected to achieve both high d-axis inductance and low q-axis inductance, in order to obtain high output torque. Methods to properly design the geometry...
This paper presents experimental studies on windage loss reduction using two types rotor for hybrid excitation flux switching motor that is intentionally designed so as to compete with an interior permanent magnet synchronous motor installed on TOYOTA PRIUS-2010. This machine makes it possible to vary its field flux by combining the two different mmf sources such as field excitation coils and permanent...
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