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• W1570710647 abstract "Abstract Permanent magnet motors with transverse flux configuration have been developed for application in direct drive systems featuring high torque at low rotational speed. These machines apply simple toroidal windings and a modular construction, which guides the main flux path transversal to the direction of rotation. The three-dimensional nature of magnetic fields, however, makes the magnetic circuit lamination a serious disadvantage. Soft magnetic composite material possesses a number of unique properties such as the magnetic isotropy, which is particularly suitable for electrical machines with three-dimensional magnetic fields. This paper presents the investigation about the application of soft magnetic composite materials in permanent magnet transverse flux motors. 1. INTRODUCTION The investigation on transverse flux machines (TFM) and their application in direct drive systems has become a topic of intense research since Weh and May proposed a new machine by combining high energy density permanent magnets (PM) and transverse flux configuration in 1986 [1]. TFMs can achieve high specific torque in low-to-medium speed and hence are suitable for direct drive application with reduced weight, cost, losses and maintenance. In normal machines the armature excitation conductors are perpendicular to the direction of motion and the magnetic flux mainly flows within the longitudinal plane. A fundamental constraint on the design of this type of machines is that the armature conductors and the magnetic flux compete for the same space around the circumference of the stator. For example, if one wishes to increase the magnetic flux by increasing the width of teeth, the perimeter available for the slots containing the armature winding has to be reduced correspondingly [2]. The force density in an electrical machine can be calculated by the product of electric loading and no-load induction, or the product of the equivalent current-loading of the rotor magnet and armature induction. The armature induction is not restricted to follow in the axial direction. TFMs employ circumferential currents, rather than axial currents of normal machines, to produce the necessary armature induction. In order to achieve a unidirectional driving force, the armature induction needs to vary direction according to the rotor position, and hence the stator windings need to employ AC excitation [3]. Fig. 1 illustrates the configuration of transverse flux machine with one active side [3]. The rotor consists of two arrays of permanent magnets mounted on the core back of laminated steels. The stator armature winding (AS) is a simple circular coil coaxial with the rotor, installed in an array of C-cores (APE1, APE2, etc.) separated by two pole pitches." @default.
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• W1570710647 date "2004-01-01" @default.
• W1570710647 modified "2023-09-26" @default.
• W1570710647 title "Study of Permanent Magnet Transverse Flux Motors with Soft Magnetic Composite Core" @default.
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