Abstract
This paper presents a new winding configuration theory of conventional and unconventional slot-pole combinations that can be used to configure windings with any slot-pole combination. First, various two-layer windings can be divided into conventional balanced winding (CBW), unbalanced winding (UBW), unconventional even slot winding (UESW) and unconventional odd slot winding (UOSW). In addition, the winding configuration can be divided into two steps—slot sorting and slot distributions to phases—and the rule of winding distribution and connection of the four kinds of windings is given. Moreover, there are four models established corresponding to the four kinds of windings. The air-gap flux density and harmonic of models with double layer flux-barrier PM-assisted rotor and without flux-barrier rotor are analyzed and compared using two-dimensional transient finite element analysis (FEA). The effect of stator magneto motive force (MMF) on torque performance affected by winding configuration is analyzed by comparing air gap magnetic density under two kinds of rotors. The simulation of torque shows that UBW, UESW, and UOSW have a certain reducing effect on torque ripple in PMASynRM. Meanwhile, a brief comparison is made in terms of radial forces and power losses; the effects produced by UBW, UESW, and UOSW compared to CBW in these two aspects are acceptable.
Highlights
Winding configuration design plays an important role in motor design
Integer slot windings have been widely used in permanent magnet (PM)-assisted synchronous reluctance motors (PMASynRMs) [2,3] due to their advantages of low space magneto motive force (MMF) harmonics and high reluctance torque production
The optimization of the flux barrier angle and shifted asymmetrical angle is proposed in [11] to solve the high torque ripple problem of 36-slot/6-pole motor; this study confirms that the torque ripple of conventional PMASynRMs with symmetrical flux barrier structure and skewed structure is very large for 36/6 integer slot windings
Summary
Winding configuration design plays an important role in motor design. There are many classification methods using various kinds of parameters for all types of windings [1]. The optimization of the flux barrier angle and shifted asymmetrical angle is proposed in [11] to solve the high torque ripple problem of 36-slot/6-pole motor; this study confirms that the torque ripple of conventional PMASynRMs with symmetrical flux barrier structure and skewed structure is very large for 36/6 integer slot windings. It is very important to find the simplest winding distribution method according to every slot-pole combination when the number of phases is given. (1) A classification theory of slot-pole combinations is proposed, which can be applied to 3-phase and multi-phase motors with any number of slots. Energies 2021, 14, 3447 table distributed to phases is proposed in this article to avoid the difficulties of the star of slots diagram, and for any slot-pole combinations, this method can give a winding configuration, which has an excellent torque performance. The slot coil turns allocation problem of common slots for UOSW is analyzed and the commonality of winding configuration methods is achieved
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