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A novel doubly salient permanent magnet motor named flux switch permanent magnet motor (FSPM) was designed and analyzed. The stator and rotor of FSPM are all salient structures. There are a marked verge domino effect and serious saturation phenomenon. Due to high nonlinearities of FSPM, finite element method (FEM) was used to analyze magnetic field distribution, permanent magnet flux linkage, electromotive...
Interior permanent magnet-synchronous machines (IPMSM) feature many favourable properties for e-mobility application as high power density and good efficiency. However, they require careful modelling because of strong anisotropies of the rotor, as they are also known from salient-pole synchronous machines. These anisotropies are often accounted for by different values for the d-axis and q-axis inductances...
The flux-switching permanent magnet (FSPM) machine exhibits competitive torque capability and power density due to the high flux density. As a penalty, the cogging torque is relative large, resulting in unfavorable torque pulsation. Due to the simple and robust rotor construction, additional dummy slots are adopted to reduce the cogging torque without skewing magnets or teeth. The optimal dimensions...
Consideration of the structure and the operation principle of Switched Reluctance Motor (SRM), it is possible to obtain super high speed drive. Therefore, a three-phase 6/2 SRM, the speed of which is 130,000 rpm, is adopted for super high speed drive. Based on the two-dimensional finite element method (FEM), the torque-angle characteristics of 6/2 SRM are analyzed and the motor structure is improved...
A brushless doubly-fed machine with tooth-harmonic wound rotor is a new type of BDFM. The machine is intended for use as a variable speed generator, or drive. Maximum torque output may be obtained by optimally dividing the overall magnetic loadings and electric loadings between the stator windings attending by reasonable rotor winding. This paper proposes an improved particle swarm optimization algorithm...
A permanent magnet dual mechanical port machine (DMPM) is a compact and pure electrical solution to the hybrid electric vehicle traction, which features as two independent rotors and permanent magnets mounted on the outer rotor. The key barrier prevent the DMPM from practical usage is the existence of the brush and slipring. A way to eliminate the brush and slipring is presented in this paper, which...
This paper deals with design criteria and characteristics analysis included electromagnetic losses analysis of a high-speed permanent magnet synchronous motor for a 7.5-kW, 60-krpm class centrifugal air compressor. In order to design this machine, we introduced analytical techniques, such as the electromagnetic transfer relations theorem and equivalent magnetic circuit method. And, from the curve-fitting...
A simple analytical method is developed to compare the combinations of stator and rotor pole numbers in flux-switching PM machines in terms of back-EMF and electromagnetic torque. The winding connections for machines having all poles and alternate poles wound are determined, based on the coil-EMF vectors. The conditions are established for balanced symmetrical back-EMF waveform. It shows that the...
For induction motor rotating near the synchronous speed, re-switching of power supply could be realized by rapid soft re-switching technology which could eliminate or reduce the inrush current and torque. The intelligent hybrid switches(IHS) based on SCRs is used to implement the control strategy of rapid soft re-switching with series of firing angles. Aiming at the alternating state of soft re-switching...
Direct torque control based on space vector modulation (SVM-DTC) preserve DTC transient merits, furthermore, produce better quality steady-state performance in a wide speed range. In this paper, a torque fuzzy logic controller was designed to substitute the original torque PI controller, and a fuzzy SVM-DTC system based on the torque fuzzy controller was given. A new integration algorithm for estimating...
Direct torque control of brushless DC motor (BLDC) is complex for turn-off phase. And the direct torque control of brushless DC motor based on hyper space vector solved the problem, however, the torque ripple was obvious. A modified method is presented in this paper in order to reduce the torque ripple based on hyper space vector. For the turn-off phase only affects the stator flux linkage but not...
This paper presents the analysis and operation of doubly fed induction generator (DFIG)-based wind power generation system under unbalanced network voltage conditions. The limited voltage and current ratings, the control capabilities of both the grid-side and the rotor-side converter (GSC & RSC) for unbalanced network voltage compensation are investigated in detail. A new current control scheme,...
Several types of interior permanent magnet synchronous motor have been utilized in the wide rage of applications. The characteristics of their cogging torque and average torque and d and q- axis inductance were clarified for the different shapes of rotor magnet and two types of stator windings. This paper clarifies the characteristics of radial attractive force and vibration for the different shapes...
Starting toque is computed based on two-dimensional (2-D) FEM with a field-circuit coupled analysis. It is discussed that the starting performance of three-phase capacitor motor is better than that of conventional induction motor, in particular, for the operating condition with starting capacitor. The results of calculation are compared to tested values, and it is verified that this new type motor...
According to the torque-speed characteristic of permanent magnet double-rotor machine, the loss has been analyzed. Combining with structure and distribution of heat source of the machine and its cooling system, a lumped parameter thermal model has been formed to simulate analysis and verify thermal design for the adjustment of key design variables.
This paper explores the global performances of doubly-fed asynchronous machines for different specifications: motor and/or generator operation, different torque-speed characteristics of the mechanical load or the prime mover. Simplified models of the active and reactive power balance are used to illustrate the capabilities of such a drive system. The DFAM synchronous speed selection is included in...
This paper presents the effect of magnetization of the permanent magnet on torque pulsation and performances of the permanent magnet brushless DC (PM BLDC) motor. Three common types of PM magnetization field patterns, radial, parallel and sinusoidal magnetization, are applied to the electromagnetic field system and investigated the motor performances and output torque profiles. The testing and simulation...
This paper reviews the concepts, developments and applications of the novel permanent magnet brushless machines having magnets and windings in the stator with particular emphasis on operation principles, electromagnetic performance, design and control aspects. The key features of the machines are summarized. Moreover, the recent development and emerging research directions of the machines are also...
The opposite-rotation dual mechanical ports (ODMP) PMSM is a novel machine applied to special situation, its electrical-magnetic relationship is different from traditional PMSM, so research on analysis method and design theory is necessary, especially for influence of main parameters on machine performance. The structure and operation principle are discussed. Its mathematic model adopted by dual d-q...
To make a comprehensive experimental research on new-type of transverse flux permanent magnet machine (TFPMM), the synchronous machine vector diagram is adopted to seek an optimal control strategy. Simulations and experiments are operated and the results show that the conventional control strategy id=0 is suitable to TFPMM very well.
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