Abstract
The dual-permanent-magnet-excited (DPME) machine employs permanent magnets (PMs) both on the stator and the rotor. It relies on the bi-directional field modulation effect (BFME) to achieve stable electromechanical energy conversion. Therefore, this new type of machine is capable of offering much higher torque capability than its traditional counterparts. This paper is devoted to investigating the optimum design method for improving the BFME of DPME machines, so as to further improve their produced electromagnetic torques. Response surface methodology is engaged to investigate the impacts of shape factors of the stator and rotor slots on the torque capability of the DPME machine, and the fitted models are built up by using both the finite element method (FEM) and the least-squares method. After that, the optimum shape factors are obtained from the fitted models. The results estimated by using both two-dimensional (2D)-FEM and three-dimensional (3D)-FEM demonstrate that the pull-out torque of the optimum case is 24.5% larger than that of the initial case, while the usage of PM material of the optimum case is 8.9% less than that of the initial case.
Highlights
The so-called dual-permanent-magnet-excited (DPME) machine has been proposed for low-speed large-torque direct drive applications [1]
The bi-directional field modulation effect (BFME) is artfully engaged to guarantee the effective coupling between the field harmonics excited by the armature windings and those excited by the two sets of permanent magnets (PMs), so that stable electromagnetic torques can be produced
It can be observed that the peak value which results in the optimum case is 100 V, which is about 20% higher than that which results in the initial case
Summary
The so-called dual-permanent-magnet-excited (DPME) machine has been proposed for low-speed large-torque direct drive applications [1]. Machines, this unique machine employs two sets of PMs, one on the stator and the other on the rotor It relies on the magnetic field harmonic components [2,3,4,5,6] to achieve electromechanical energy conversion. Due to the utilization of two sets of PMs, abundant field harmonic pairs can contribute to the generation of electromagnetic torque simultaneously. This new type of machine is able to offer much higher torque capability than its traditional counterparts. Since it is composed of only one rotor and one stator, its mechanical structure is much simpler than the existing integrated harmonic machines [7,8,9,10]
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