Sleeve design of permanent-magnet machine for low rotor losses

Self Cite

The inset-surface permanent magnet (ISPM) machine can achieve the desired electromagnetic performance according to the traditional deterministic design. However, the reliability and quality of the machine may be affected by the essential manufacturing tolerances and unavoidable noise factors in mass production. To address this weakness, a comprehensive multi-objective optimization design method is proposed, in which robust optimization is performed after the deterministic design. The response surface method is first adopted to establish the optimization objective equation. Afterward, the sample points are obtained via Monte Carlo simulation considering the design-variable uncertainty. The Design for Six Sigma approach is adopted to ensure the robustness of the design model. Furthermore, the barebones multi-objective particle swarm optimization algorithm is used to obtain a compromise solution. A prototype is manufactured to evaluate the effectiveness of the proposed method. According to the finite-element analysis and experimental tests, the electromagnetic performance and reliability of the machine are significantly enhanced with the proposed method.

Section: Introduction1mentioning

confidence: 99%

Multi-objective optimization design of inset-surface permanent magnet machine considering deterministic and robust performances

Jia

Zhao

et al. 2021

Self Cite

“…In HEMs, field excitation and PM excitation are adopted, and they can exhibit good flux regulation capability without sacrificing the torque density to a certain extent [6][7][8] . However, there still exist certain challenging issues in HEMs [9][10] . One of the issues involves the saturation effect in ferrite core due to DC field current [11] .…”

Section: Introduction1mentioning

confidence: 99%

Design and optimization of a slot-PM-assisted doubly-salient machine based on saturation assuaging

Mao

Niu

Wang

2021

In this study, a novel slot PM-assisted doubly-salient machine (SPMA-DSM) is proposed based on saturation assuaging. In this machine, DC current is adopted as the excitation source. The permanent magnets assembled in slots are used to realize saturation assuaging, which can offer higher torque density and improved overload capability. Additionally, the torque density can be extended to wider scale before saturation. Multi-objective optimization based on differential evolution (DE) coupled with finite element method (FEM) is conducted to further improve the performance of the proposed machine. When compared to traditional flux-controllable machine, the PMAHEM exhibits the merits of: ① higher torque density per PM volume, ② lower torque ripple, and ③ wider flux controllable range. The simulation results indicate that the electromagnetic torque increases by more than 20% after the saturation assuaging design and optimization.

“…Nowadays the unstable supply chain and price of rare earth element materials may limit the large-scale application of permanent magnet (PM) machines in electric vehicles and many other applications [1][2][3][4] . Alternatively, wound field synchronous machines in which the field excitation is provided by a DC winding can be applied to address this challenge [5] , which can be divided into two categories according to the location of the DC winding.…”

Section: Introductionmentioning

confidence: 99%

Influence of rotor iron bridge position on DC-winding-induced voltage in wound field switched flux machine having partitioned stators

Zhu

Wang

et al. 2021

In this study, the influence of the position of the rotor iron bridge on the DC-winding-induced voltage pulsation in a partitioned stator wound field switched flux machine is investigated. Analytical and finite element (FE) analyses show that both the open-circuit and on-load DC-winding-induced voltages can be minimized by positioning the rotor iron bridge adjacent to the inner air gap closer to the DC winding. This is due to a smoother inner air-gap magnetic reluctance while maintaining the average electromagnetic torque at 92.59% of the maximum value. The analyzed machine with the rotor iron bridge adjacent to the inner air gap is prototyped, and the experimental results validate the analytical and FE results.