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Permanent magnet assisted synchronous reluctance machines (PMA SynRM), stemming from the combination of synchronous reluctance and interior PM machine topologies, have recently gained increasing popularity as a viable candidate for electric vehicle traction applications due to concerns regarding the price volatility of rare-earth magnet materials. Their attractiveness can be attributed to their distinct...
A variety of analytical and quasi-analytical methods have been developed to predict the eddy current loss in surface mounted permanent magnet (SPM) machines. 2D based predictions have limited accuracy while 3D finite element (FE) calculations require excessive computation time.
This paper investigates the transient synchronization performance of a line-start permanent magnet synchronous machine (LS PMSM) taking into account the effect of the rotor cage slot design, active permanent magnet volume and load inertia. First the transient performances of a rotor cage with different slot profiles and the same cross sectional area are evaluated. The design optimization of LS PMSM...
This paper presents the implementation of the Taguchi method for a retrofit design of a line-start permanent magnet motor. To evaluate the viability of the method, the optimum designs obtained from both the Taguchi and a traditional optimization methods are compared. This outlines the respective advantages and disadvantages of both methods. It shows that the Taguchi method is an efficient and robust...
This paper reviews the historic and current development of magnetic gear technologies. There has been considerable amount of research and development activities on magnetic gear technologies in recent years. However, it is still not clear if this technology is ready for potential industry applications. The purpose of this paper is to summarize the historic and current development work of magnetic...
This paper presents the design, construction and performance evaluation of a disc-type magnetically geared permanent magnet (MGPM) machine for wind power application. The electromagnetic design for both magnetically coupled and decoupled configurations are described. Considering the complex structure of a MGPM machine, special attention is also paid to the mechanical design aspects. The optimized...
This paper presents the design of a magnetically geared PM machine with an inner stator. Both magnetically coupled and decoupled configurations are evaluated. Key design aspects are discussed. The machine is optimized for maximum torque per active mass using two-dimensional finite element (FE) analysis. Special attention is also paid to cogging torque minimization. The performance characteristics...
As a renewable, clean energy, wind energy has attract more and more attention. It has become a common understanding of the world to vigorously develop wind energy. In order to guarantee the safety and reliability for wind power integration operation, it is of great significance to establish an appropriate wind power generator system model and analyze its electromagnetic transient characteristics....
The paper describes a number of computationally efficient techniques for predicting rotor eddy current loss in permanent-magnet brushless machines. In particular, a correction factor which takes into account the finite length effect of magnets is employed to adjust analytically predicted losses for each harmonic. The results are compared with 3-dimensional (3D) finite element (FE) calculations. A...
The paper describes the merits of a recently developed form of 3-phase permanent magnet brushless ac machine in which the concentrated coils of each stator phase are either wound on adjacent teeth or on alternate teeth. Such a machine is often referred to as modular, and offers a number of significant advantages over conventional permanent magnet brushless machines. For example, it results in a smaller...
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