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Magnetic gears are able to transmit torque between an input and an output shaft without mechanical contact. As for electrical drives, torque density, acoustic noise and torque ripple are of primary concern. This paper describes the influence of the pole numbers on the radial forces and the cogging torques. We show how continuous and discrete skewing can suppress torque harmonics effectively. Further,...
The performance of doubly-fed induction generators (DFIGs) would be affected by the rotor winding inter-turn short circuit fault, such as harmonics increase in electromagnetic quantities and torque pulsation. Thus, it is necessary to monitor and diagnose the rotor inter-turn fault for DFIGs. However, the rotor three-phase windings inherent imbalance and static air gap eccentricity may cause misdiagnosis...
This paper presents the validation of a MPPT technique, based on a Growing Neural Gas (GNG) network, for high performance marine current generator with induction machine, in presence of torque oscillations caused by time and space variation of the turbine operating conditions. The unsteady torque delivered by a notional turbine working in the presence of waves and of sea bottom boundary layer is obtained...
This paper proposes an alternative interior permanent magnet machine (IPMM) design in which the rotor consists of stacks varied in the axial direction. The proposed design aims to reduce the amount of permanent magnet (PM) materials in conventional IPMMs. The PM width and the PM pole arc on the rotor surface for each rotor stack are both optimized to provide a resultant PM flux distribution in the...
There is need to develop fault detection techniques for reliable real-time diagnosis of axial-flux permanent magnet machines as they are now widely used in a variety of applications. Thus this paper presents detection techniques for interturn short circuit in an axial-flux permanent magnet machine based on a combination of torque and current monitoring using finite element analysis and experimental...
In this paper, axial-flux permanent magnet machine is modelled to precisely imitate static eccentricities. From the model, the effect of the non-uniform airgap permeance which arises from static eccentricities on current harmonics and torque is experimentally studied. The influence of two cogging torque minimization techniques on both signatures, in the presence of static eccentricity is also examined...
Conventional model for interior permanent magnet synchronous motor (IPMSM) utilizes only the fundamental component of flux linkages in the abc reference frame that means the flux linkages in d- and q- axes are constant quantities with rotor position. An extended analytical model of IPMSM is presented in this paper that incorporates the fundamental as well as the harmonics of flux linkages. The harmonics...
In this paper, one new machine family, i.e. named as flux-modulation machines which produce steady torque based on flux-modulation effect is proposed. The typical model including three components-one flux modulator, one armature and one excitation field exciters of flux-modulation machines is built. The torque relationships among the three components are developed based on the principle of electromechanical...
A series of 12-slot 8-pole concentrated winding IPM synchronous motors (IPMSMs) are analyzed to understand the impact that certain design changes may have on performance over a wide speed range. Basic theory of operation is used to describe desirable characteristics; investigations are carried out to show how these characteristics may be realized through rotor design changes. Simulations are conducted...
During the mass production of surface-mounted permanent magnet motors the rotor and stator geometrical dimensions usually deviate from their nominal values due to manufacturing tolerances which impact machine performance. Radial misalignment in the placement of the permanent magnets on the rotor surface as well as slot opening variations are common deviations observables in the final product. As a...
In this paper, current command to reduce noise and vibration of switched reluctance motors have been investigated. Noise and vibration were reported to be significantly reduced by making a radial force sum as flat as possible with current profiling. In order to realize flat radial force sum, dc, fundamental, and second harmonic components were required. The dc and fundamental components are determined...
The purpose of this paper is to characterize the performance of a novel dual-stator six slot four pole (6/4) flux switching permanent magnet machine. The proposed dual-stator 6/4 topology eliminates even order harmonics in the flux linkage and back electromotive force, which are present in the conventional single stator topology. The resulting back electromotive forces of the proposed dual-stator...
Synchronous Reluctance motor has recently gained popularity in applications where induction motors are normally employed. Additionally, when permanent magnets are buried in the rotor, they become an alternative for high performance applications. Some of its drawbacks such as high torque ripple and low power factor need to be overcome. The design of Synchronous Reluctance motors with asymmetric flux...
A computationally efficient method is presented to investigate additional cogging torque harmonics resulting from misalignment of the rotor and stator caused by assembly and manufacturing tolerances in an axial flux, fractional pitch PMSM. The hybrid analytical / FEA method utilizes superposition of a pole transition over a single stator slot and is used to predict the effect on cogging torque of...
A global permanent magnet synchronous machine (PMSM) loss minimization control method is proposed based on nonlinear optimization in this paper. A look-up table based PMSM flux-linkage model is introduced to account for the saturation and cross-coupling effect, and the iron loss model is also numerically developed to account for the harmonic effect. The loss minimization problem can be programmed...
In this study a semi-analytical calculation method for obtaining 3D solutions for the torque of radial flux permanent magnet eddy current couplers is presented. In this way the use of computationally expensive transient 3D finite element solutions is avoided, which is very important when it comes to the design optimisation of these machines. The proposed analytical method takes the effect of flux...
This research proposes a novel low-voltage inverter-fed motor drive with variable characteristics achieved through the individual winding current control for the automobile traction motor. The independent armature winding with low-voltage inverters can improve the total efficiency by reducing the converter losses. Furthermore, the motor can expand the operating range since the inverters are able to...
This paper studies the modeling, switching strategy and control scheme for NPC three-level (NPC-3L) inverter fed dual-three-phase permanent magnet synchronous motor (PMSM) drives. Firstly, the dynamic modeling of the system is described and analyzed. Then, the space vector modulation (SVM) strategy is designed for the drive system under double d-q frames. Not only the harmonic performance but also...
This paper proposes a novel detached winding for 6-phase double-stator inner-rotor axial flux PM machines. The connection of detached 6-phase winding is firstly given, followed by a comprehensive comparison with the conventional 6-phase winding in aspect of the winding factor, EMF and inductance, et al. Comparison of performance including rotor eddy current loss, torque ripple and rotor unbalanced...
In this paper, winding configurations of multiphase flux-switching permanent magnet (FSPM) machines with multiple winding sets are investigated by finite-element analysis (FEA). The results reveal that for certain stator- and rotor-pole combinations, symmetrical winding configuration used in traditional machines may not invariably apply to multiphase machines in some respects, since the coils with...
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