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The short-time high capacity reactive power output and quick dynamic response performance are two key performances of new large synchronous condenser. In this paper, the effect of load condition on transient response capability of synchronous condenser by finite element analysis (FEa) model. A 300/-150Mvar prototype synchronous condenser is provided for modeling analysis at a group of different steady...
To solve the low power density disadvantage of direct-drive wave energy converter, caused by low direct-drive speed. A novel linear tubular field modulated permanent magnet generator is proposed, which can effectively improve the performance of this kind of generators. The operation of the proposed generator is analyzed. The generator performance is evaluated using finite element method. The results...
In this paper, conventional Magnetic Gear (MG), which has Surface Mounted Permanent Magnet rotor Magnetic Gear (SPMMG), and Consequent pole Permanent Magnet rotor Magnetic Gear (CPMMG), which has high torque density, is analyzed. For analysis, various pole pieces shape considering flux density distribution and leakage flux in pole piece core are studied. Moreover proposed design variables are adopted...
Due to the special structure and working mode of AC and DC excitation, the vibration of magnetically controlled saturated reactors (MCSRs) is larger than that of the ordinary ones. In order to design an appropriate damping system or vibration isolation system for MCSRs, this paper studies the stress characteristic which is the inherent reason of vibration and noise. The multi-group magnetization and...
This paper presents a method to calculate the core losses in SiFe laminations under magnetizations with DC bias and harmonics. DC bias is usually generated by the ground return current of high voltage direct current (HVDC) system intrude into the windings of neutral-grounded transformers, which leads to increase of harmonics and core loss. For accurate calculation of core losses under DC bias, the...
This paper introduces nonlinear modeling of a new dual rotor machine named dual-rotor permanent magnet reluctance (DRPMR) machine. The paper proposes the varying magnetic network model of DRPMR machine considering possible saturation and nonlinearity according to its novel structure. The final results are verified by the finite element method (FEM) and results prove the validity of the proposed model.
The effect of slots poles combination on inductance and torque was investigated on the motor with outer rotor bonded NdFeB Halbach cylinder designed for automotive application. Motor with Halbach rotor has better performance with higher number of slots and poles combination. The magnet eddy loss was calculated and analyzed with different slots poles. The impact of rotor back on the eddy current was...
A novel method for post-assembly magnetization of surface-mounted permanent-magnet motors is proposed. The magnetizing windings are directly wound on the outer surface of the permanent magnet (PM), and then assembled on surface of the rotor. The PM poles can be magnetized and demagnetized after assembly by the integrated magnetizing windings. Once the PM poles experience demagnetization fault, the...
Hybrid permanent magnet (PM) variable flux memory (VFM) machines employ both the high coercive force PM, i.e. the constant PM (CPM), and the low coercive force PM, i.e. the variable PM (VPM), with which the PM magnetization state can be flexibly regulated to match various operation requirements. These two kinds of PMs can be magnetically connected with either parallel or series configuration so that...
A saturation map for the non-uniform magnetic saturation of a V-shaped interior permanent magnet rotor is formulated in this paper. This saturation map is used in conjunction with the magnetic equivalent circuit theory to propose an analytical method for accurate computation of the airgap permanent magnet flux density for interior permanent magnet rotors. Unlike the conventional methods, the proposed...
This paper presents an improved analytical model for estimating the high-frequency current ripple of interior permanent magnet (IPM) synchronous machines due to PWM switching. The proposed model accounts for the impact of slotting effects, magnetic saturation, and cross-coupling between the d- and q-axes. The model is subsequently used to investigate several factors that influence the PWM-induced...
Considering that the magnetic performance of the ferrite magnet is relatively weak, an interior ferrite Permanent magnet synchronous motors (PMSM) with reliable flux-focusing structure is presented in this paper. An optimal maximum torque per ampere (MTPA) control strategy is proposed, which fits the variation of core saturation and winding inductances. In order to simplify the computation complexity...
In this paper, a three-dimensional (3-D) generic magnetic equivalent circuit (MEC) using mesh-based formulation was developed for the electrical engineering applications. The particularity of this model consists in a discretization with hexahedral mesh elements, which can be chosen by the designer. For example, the 3-D generic MEC has been applied to a U-cored static electromagnetic device. In order...
This paper presents the comparative study and optimal design of a transverse flux linear machine with different PM configurations, viz. surface-mounted and consequent-pole, in which the consequent-pole version is firstly proposed. Firstly, the effect of variation of the main design parameters on both topologies are studied. Then, the multi-objective optimization method based on genetic algorithm combined...
The self-sensing magnetic bearing technology offers significant cost savings and the potential for dynamics advantages due to its fundamental sensor-actuator collocation. This paper proposes a rotor displacement self-sensing scheme for the permanent magnet bias magnetic bearings (PMB) using three-level amplifier demodulation. Based on the proposed structure of radial PMB, the self-sensing principle...
There has been a revived and growing role for electrical machines and drives across a wide range of applications. Such applications include, hybrid/electrical traction applications, aerospace applications, and renewable energy. All these applications present different set of requirements and challenges. The common trend is that there is a need for higher-performance electrical machines in terms of...
Linear oscillating motor can produce linear reciprocating movement directly. Due to its special topology and motion type, segmented laminations are generally used as the stator core with coils wound inside. Though it contributes to eddy current elimination and air-forced cooling, the magnetic field suffers from severe saturation in the stator and affects the thrust output severely. In other words,...
This paper proposed an analytical method for the calculation of electromagnetic toque in a Permanent Magnet-assisted Synchronous Reluctance Motor (PMASynRM) based on equivalent magnetic network model. The Fourier expression of the electromagnetic torque considering harmonic is theoretically analyzed and simulated. With the aim of reducing torque ripple, the effect of the flux barrier angle on the...
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