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This paper proposes a new topology of a Linear Veriner Hybrid Permanent Magnet (LVHPM) machine with E-core stators and a segmented chamfered translator, which is shown to give mass reduction and better magnetic flux path compared to existing designs. Linear Permanent Magnet (PM) generators have the capability to reduce the number of moving parts, providing a simpler mechanical drive train when used...
Infinite numbers of virtual permanent magnet (PM) blocks can be used to represent the segmented magnets per magnet pole in any combination of slot and pole numbers of the semi-closed surface-mounted permanent magnet synchronous machines (PMSMs). This concept is exploited and developed in the two-dimensional (2D) analytical subdomain model to predict the motor performances. The model is able to facilitate...
This paper presents an analytical method for the design of permanent magnet synchronous motors (PMSM) equipped with several and odd number of radial magnet bars with different remanence. The thickness of each magnet bar is fixed. So that, the magnetization waveform generated has almost sinus waveform. The proposed rotor structure is an alternative to the well-known Halbach and hybrid magnetization...
Partitioned stator (PS) flux reversal (FR) (PS-FRPM) machine in which PMs are surface-mounted in one stator whilst the armature windings are wound in the other stator can produce higher torque density than the conventional FRPM machine with single stator, due to the higher utilization of inner space [1]. As shown in Fig. 1(a) for 12/10-pole PS-FRPM machine, the surface-mounted PM (SPM) inner stator...
Magnetic gearbox (MGB) becomes an attractive research topic in mechanical transmission as it offers significant advantages over mechanical gears such as contactless power transfer, high gear ratios, inherent overload protection, high torque density, and maintenance free. However, the main design problem of magnetic systems is the cogging torque originated from high strength permanent magnets (PM),...
This paper address the effect of magnet coverage on the torque, iron and magnet loss components and torque ripple of two surface permanent magnet synchronous generators of 5MW. The values of torque, torque ripple, iron and magnet losses are calculated using a FEM program. It is concluded that the optimal magnet coverage can only be found by extensive investigations for each specific machine. However,...
A number of manufacturing challenges exist in creating a robust permanent magnet synchronous motor (PMSM) design to meet critical requirements for cogging torque and torque ripple in specific applications. In addition, reduction of back EMF harmonics that lead to torque ripple is also required during design. Due to manufacturing tolerances, maintaining capability with these requirements is very difficult...
In this paper, an optimal design method of a high power permanent magnet synchronous generator (PMSG) turbine by wind is proposed. The expression of the cogging torque was studied based on the Fourier analysis. A method of permanent magnet shifting to reduce cogging torque was presented. In this paper a prototype for 5MW generator was built and a comparative study of the performance both of no load...
Fractional pitch is commonly used to significantly reduce cogging torque in PMSM, however, maximum benefit is dependent on accurate stator and rotor manufacturing. This paper presents a method of decoupling the stator and rotor contributions to total cogging torque. Rotor causes are further decoupled into magnet placement and strength variation. Decoupling is possible due to stator and rotor affected...
This paper presents an analytical solution for prediction of the no-load magnetic field in slotted semi-closed permanent magnet axial flux synchronous machines. The technique is based on 2-D solution of the Maxwell's equations using the separation of variables method, this technique is validated for two different machines. The magnetic field expressions are developed in slots regions, magnetic airgap...
This paper examines two methods-shifting magnet, optimizing the magnet pole arc-for cogging torque reducing in permanent magnet motors. The methods were applied to existing machine designs and their performance was calculated using Flux 2D which bases on finite-element analysis (FEA).
This paper describes the thrust and the airgap flux distribution of 2-pole PM linear synchronous motor, The feature of a Halbach array is discussed by comparing with two different type magnet arrangements. One is a conventional magnet arrangement. The other is composed of a Halbach array with a back yoke. 3-D boundary integral equation method is applied to these models. The thrust and the flux density...
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