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Design of a permanent magnet transverse flux machine optimized for high torque density and high power factor is presented. The optimization process focuses on performance enhancement through improvement of power factor without sacrificing torque density. Simple magnetostatic simulation based method is proposed for the optimization process. Magnetic couplings among axially separated phases are also...
Vernier machines achieve high torque densities and fit the demands of direct drives due to the usage of the magnetic gearing effect. Unfortunately, Vernier machines suffer from a poor power factor. Thereby, in analytic models the power factor depends on the permeance coefficients of the ferromagnetic flux modulation poles (FMPs), thus the FMP shape influences the power factor. Therefore, this paper...
In this paper, a novel doubly magnetic geared permanent magnet (DMG-PM) machine is proposed. Through numerical finite element analysis, it is found that the torque transmission capability of the DMG-PM machine is ∼24% higher than its regular counterparts, while the PM usage remains the same. Moreover, the back-EMF is enlarged significantly by ∼37%. In addition, the power factor of the proposed machine...
Permanent magnet vernier (PMV) machines are attracting more and more attention due to its high power density and simple mechanical structure. In this paper, a novel PMV machine with improved permanent magnet circuit is proposed. For the proposed PMV machine, half of the PMs in the rotor are moved from rotor to the stator slot opening, and Halbach array PMs are employed in the stator. The analysis...
A simplified analysis of influence of pole pairs on the steady-state behavior of induction motors is presented. The analysis makes simplifying assumptions to express relationship between key steady-state performance parameters of 2-pole reference motor compared to its multiple pole counterparts. The analysis is performed using considerations of fixed geometrical dimensions on one hand and fixed output...
While field oriented control (FOC) and direct torque and flux control (DTFC) have been established as mature technologies for high performance a.c. motor variable speed drives, scalar (V/f and I-f) control is sufficient for general sensorless, lower cost, a.c. motor drives in applications such as pumps, compressors, ventilators, which constitute the majority in terms of installed power. The present...
Flux-modulation power-split devices for hybrid electrical vehicle (HEV)s have been obtaining attentions in recent years due to its brushless and high torque density. However, the flux-modulation power-split devices always suffered from low power factor, which is even lower than 0.6 and results in higher cost and larger volume in the converter. This paper proposes a novel dual mechanical port, spoke...
The line-start permanent magnet synchronous motor (LSPMSM) attracted a considerable attention because of the higher value of the product between the power factor and the efficiency. The paper proposes an analytical design method for the LSPMSM, considering the asynchronous starting and the synchronous steady state parameters. Using this theoretical approach, all the synchronous and asynchronous starting...
The transverse flux permanent magnet synchronous machine (TFPM) is a novel machine arousing widespread concern in recent years. Achieving high torque density to save energy and rough material and reduce the volume and weight of the machine is the best features of TFPM. However, because of low power factor and complex manufacture technics, the application of TFPM is restricted. The dissertation is...
Parametric motors have many excellent features compared with ordinary single-phase motors, and are expected to find many practical applications. In this paper, methods for improving the characteristics of parametric motors in order to render them more practically useful are discussed, utilizing the equivalent circuit of an induction motor. Implementation of such methods results in a parametric motor...
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