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This paper investigates a novel hybrid axial- and radial-magnetic circuit permanent magnet synchronous machine with flux weakening capability. The presented machine consists of a solid rotor and two stators, i.e. radial stator and axial stator. The PMs are radially buried in the solid rotor so that the flux flows into both radial and axial stator. This paper describes the principle of the presented...
In order to reduce the radial magnetic flux leakage loss, lower temperature rise of stator coils and hot spots, improve efficiency, the rotor of the large-capacity nuclear turbine-generator is designed with bias slot. However, the magnetic circuit structure and the electromagnetic properties of the generator are changed by the bias of rotor slot, taking direct-axis reactance, quadrature-axis reactance...
This paper deals with the study of rotor turbogenerator eccentricities using an analytical approach and FEM. First, we present the cases of eccentricities and the method, based on the measure of the flux density in the air-gap, used to detect the faults. Both models, the analytical approach and the numerical one are then introduced. Using these models, static, dynamic and combined eccentricities are...
This paper deals with the analysis of external magnetic field of three-phase induction motor in order to diagnose the air gap asymmetry caused by eccentric rotor. Dynamic eccentricity produces low frequency air gap flux components, however they can be observed in stator current only under mixed eccentricity. Unlike MCSA (motor current signature analysis), described method allows to detect purely dynamic...
This paper presents a performance of an advanced 4/2 SRM(Switched Reluctance Motor) for high speed blower system. For the high speed application, lower electrical frequency and constant torque are very important to reduce core losses and mechanical vibration. The presented 4/2 SRM has asymmetric inductance profile and variable air-gap for torque ripple reduction and continuous torque. In order to...
This paper presents the characteristic analysis on the high speed synchronous generator considering load conditions and power factor. The generator consists of the rotor with the short-circuited field coils connected to armature coils of an exciter and a stator with three-phase winding. To analyze the characteristics considering load conditions, the equivalent circuit method considering the effects...
This paper presents a novel topology of Vernier motor for low speed and high torque applications. The motor has a doubly-toothed rotor sandwiched between the inside and outside stators. With six diodes connected to the stator windings, the motor is capable of self-commutating when working with the normal three-phase ac source for constant speed operation. In this paper, the configurations and the...
Linear switched reluctance machine (LSRM) has low force density, high acoustic noise and low energy conversion ratio. In this paper a novel linear segmented switched reluctance machine (LSSRM) having high force density and energy conversion ratio is proposed. This machine has segmented rotor and full pitch winding on the stator. This machine is the linear counterpart of segmented switched reluctance...
A novel dual-stator hybrid excited synchronous claw-pole generator (DSHESG) is proposed in this paper. The structure characteristics are described and the operation principle is introduced. Using finite element method, the field-control capability of DSHESG is studied. Some static characteristics including air gap flux density, no-load flux linkage, back-EMF, self-inductance of field windings, and...
This paper deals with an overhang effect of permanent magnet (PM) in the new type axial flux permanent magnet synchronous motor (AFPMSM) with a double-sided air-gap. 3-D electromagnetic finite element method (FEM) is used to calculate the air-gap magnetic flux density, back electromagnetic force (EMF) and the cogging torque according to the variation of the overhang angle. From the results, we can...
This paper proposes a new stator pole shape having non-uniform air-gap and a pole shoe on rotor pole to minimize the undesirable torque ripple of switched reluctance motor (SRM). Through numerical analysis using finite element method (FEM) and optimization, the proposed pole-shape-optimized stator and rotor having pole shoe are proven to give higher average torque and reduced torque ripple
This paper presents a detailed study of the rotor asymmetry, caused by broken bars, and their effects on the stator current of an induction machine under different supply conditions. The analytical models dedicated to the rotor faults are often penalized by simplifying assumptions, particularly the distribution of the magnetic flux density in the air-gap. The important information is likely to be...
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