Abstract
A single-phase flux reversal machine (FRM) has many advantages in high-speed applications because of its simple and reliable rotor structure without magnets or winding, simple and cheap concentrated stator windings, high efficiency, and power density. However, the major problem of single-phase motors is the high torque ripple, which shortens their lifetime and causes noise and vibrations, not only in the machine, but also in the mechanisms coupled therewith. This paper presents a novel three-phase machine consisting of three single-phase machines, having a common shaft aiming to reduce the torque ripple and to improve motor behavior. In this paper, the mathematical model of the single-phase flux reversal motor, as well as the conversion procedure of the single-phase motor parameters to the three-phase ones, is considered. Furthermore, an optimization procedure of the motor and choosing the optimization objectives are done. The finite element two-dimensional (2D) method is used to simulate the machine and to show the results.
Highlights
Flux Reversal Machines (FRMs) are doubly salient machines with permanent magnets (PMs) glued on the stator
The stator windings are of a concentrated type, and the flux linkage of the PMs reverses its polarity in the stator windings when the rotor rotates [1]
The FRM of this kind was designed for a high-speed vacuum cleaner [2]
Summary
Flux Reversal Machines (FRMs) are doubly salient machines with permanent magnets (PMs) glued on the stator. Two thirds of the stator internal surface are used, which decreases the power density and efficiency of the motor; efficiency of the motor; There is no geometrical symmetry of rotating FRM as a whole by 180◦ , which causes radial force. Radial areinabsent, the bearing lifetime is increased because of an even number of rotor motors have a small starting torque and large torque ripple It causes noise and teeth, Single-phase resulting in motor symmetry. The stator are used, which decreases the converter power density and torque ripple rather high [7]internal when a surface conventional three-phase frequency is used; efficiency of thirds the motor. Only two of the stator internal surface are used, which decreases the power density and present paper discusses a novel three-phase high-speed modular design with four efficiency of the the motor. FRM geometry geometry according according to [6]
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