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By analogy with Halbach permanent magnet (PM) array, a novel ironless trapezoid winding array (TWA) is designed to achieve a primarily single-sided and well sinusoidal magnetic field. After deriving the TWA's current density formula in Fourier series, via the magnetic vector potential we derive the analytical solution of its magnetic field, which is verified by ANSYS finite-element method.
This paper deals with the study of interturn short circuits in rotor windings of a synchronous generator using FEM. Results obtained for magnetostatic and magnetodynamic cases are presented and discussed.
Doubly-Fed Induction Generators (DFIGs) are widely used for modern wind turbines. Although the stator winding of DFIG is directly connected to a grid while a rotor winding is connected to converters, it has a large outer size because of the high current in the stator winding. This paper proposes a grid-connected to a rotor type DFIG where rotor winding is connected to the grid instead of stator winding...
In this paper, the efficiency optimization of an axial flux permanent-magnet synchronous generator with concentrated pole windings is examined for a 3.6 kW/2000 rpm combined heat and power application. A study of the influence of a limited set of geometry parameters on the efficiency of this type of machine is done, using both analytical and finite element methods. Finally, the results of both methods...
Recently double-side long primary type linear launcher has attracted more and more attentions for the electromagnetic launch system (EMLS). This paper analyzes the influence of segmented armature and presents a segmented double-side plate permanent magnet linear synchronous motor (PMLSM) in which the new ring windings are engaged. The calculation is described using analytical and two-dimensional finite-element...
This paper presents analytical design procedures of transverse flux linear motor (TFLM). With ratios of important design variables and simplified equivalent magnetic circuit, flux linkage is determined at load and no-load condition. The number of turns of windings can be calculated by considering the amplitude of applied voltage, and rated current, coil diameter, and winding area can be obtained with...
This paper presents an FEM analysis for computing the performance of a double-sided axial flux permanent magnet synchronous generator (AFPMSG). The AFPMSG has 16 poles on each rotor and a compact disk armature winding with 12 coils and without iron core. The accurate field distribution and load performance are computed for a prototype machine.
Inductance is an important parameter of PMSM due to its direct impact on the dynamic performance, especially on the precise control of the system. In this paper, a novel calculation method for the incremental inductance of motor winding is adopted, and a data processing technique is presented. Nonlinear incremental inductance of the motor winding was tested with the dynamic hysteresis loop method...
IPMSM with more than 10KW, which is used for HEV, has lower Ld-Lq since a groove was made on the Q-axis flux path of the rotor to reduce the eddy current loss in the permanent magnets. Therefore, a high reluctance torque and wide operating range can't be expected. Also in the winding layout, concentrated winding may widen the operating range; however this is needed the fractional slot or leads to...
A limited short circuit current PM motor is studied based on the segmentation of the rotor magnets. The principle is to reduce the magnetic flux by means of magnets subdivision and an increase of rotor pole number. The effect of magnet segmentation on machine characteristics is analyzed using finite element method (FEM). The short circuit current of designed fault tolerant machine is well limited...
The interior permanent magnet (IPM) motor is normally designed with two or more flux barriers per pole. The form of such flux barriers has a direct impact on the torque developed by the IPM motor, including both average value and ripple. The Machaon structure is formed by flux barriers of different shape, greatly reducing the torque ripple. Their shape must be optimized based on the number of poles,...
The described study involved interior permanent magnet (IPM) motors with distributed and concentrated (non-overlapping) stator windings. The machines were operated with sine-wave current-regulated power electronic drives. A coupled finite element model was used for the electromagnetic field and electric circuit analysis. Special instrumentation was employed for the measurement of 3D forces. It is...
Two-dimensional electromagnetic analysis model of supercritical turbine generator was established. After calculating the mathematical field, the eddy loss distribution and winding resistance enhanced coefficient of hollow and solid strands at different positions were obtained. Based on that, the temperature field and fluid field were calculated with coupling, from which temperature and fluid velocity...
A new kind of induction motor with compound cage rotor (IMCCR) is proposed in this paper, in which rotor bars are composed of upper parts made of alloy (conductor for electric and magnetic) and lower parts made of cast aluminum. By using FEM, the electromagnetic and thermal fields of IMCCR are analyzed with coupling. The electromagnetic fields of motor operating with locked rotor and striking current...
In this paper the influence of axial length ratio of stator segment on performance of tubular transverse flux linear machine (TTFLM) is investigated. The following issues have been emphasized: cogging force, winding flux, and back-EMF. The special topology of TTFLM requires 3-D finite element analysis to accurately predict the machine performance. However, equivalent 2-D finite element analysis is...
In order to reduce harmonic distortion, this paper presents a distributed winding type axial flux permanent magnet synchronous generator (AFPMSG), suitable for wind turbine generation systems. The characteristic analysis is performed with the aid of a 3D finite element method (FEM) and these analysis results are confirmed by the experimental results. To improve the output power and unbalance of the...
In this paper, two novel structures of linear double salient permanent magnet motor (LDSPM) having magnets, armature windings in primary are proposed and compared, including the configurations and static characteristics based on finite element analysis. The results indicate that the proposed topology can avoid the asymmetry of back-EMF waveforms and reduce cogging force and thrust force ripple.
Induction motor operated with high voltage source generally generates high current at starting mode and has a long transient time after start. This large and sustaining starting current causes end windings of stator to have excessive electromagnetic force on them. This force is the source of vibration and has a negative and serious influence on the insulation of end windings. Therefore design of end...
This paper presents size reduction of primary iron core for tubular linear induction motor by improved winding configuration. Using one-ampere conductor method, magnetic field analysis of tubular linear induction motor for size reduction is conducted. Size reduction and improvement of air gap flux distribution is achieved by improved winding configuration, and analysis results are verified by finite...
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