Analytical determination of optimal split ratio for high-speed permanent magnet brushless motors

Li, Quanwu; Dou, Manfeng; Fang, Chun

doi:10.1109/icems.2015.7385113

Cited by 11 publications

(7 citation statements)

References 11 publications

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“…In actual machines with non-sinusoidal PM field distribution, yoke width can be corrected by multiplying an airgap field distribution coefficient, which is the quotient of the fundamental amplitude divided by its peak value. Determination of the stator dimensions with (16) and (17) makes the peak flux density in both teeth and yoke the same, being B m . The area of one slot A slot can be calculated according to the dimensions derived above, considering the tooth tip height H tip (see Fig.…”

Section: Stator Dimensionsmentioning

confidence: 99%

“…In addition to the copper loss, stator iron loss has gained more attentions in recent years’ research on the split ratio optimisation, especially for the high‐speed machines [4, 5, 14, 16]. The iron loss is related to many factors, such as the operating frequency, magnetic flux density, and stator core geometries.…”

Section: Introductionmentioning

confidence: 99%

“…The iron loss is related to many factors, such as the operating frequency, magnetic flux density, and stator core geometries. It can be calculated with a software package [17] or more often with the no‐load iron loss formulas [4, 5, 11, 14, 16]. In these studies, the iron loss due to the PM field is considered, but that due to the armature reaction field is neglected.…”

Section: Introductionmentioning

confidence: 99%

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Split ratio optimisation of high‐speed permanent magnet synchronous motor with multi‐physics constraints

Qin

Shen

2020

IET Electric Power Applications

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Split ratio is one of the most crucial parameters in a permanent magnet synchronous machine (PMSM), which has great impact on both machine torque or power, and efficiency. Extensive studies have been carried out on the split ratio optimisation. Compared with the regular‐speed machines, the high‐speed PMSM has more types of power loss playing dominant roles, and has deeper coupling of multi‐physics fields. Therefore, special concerns need be made. More comprehensive and accurate power loss estimation should be implemented; both of the critical mechanical stress constraint of the rotor and the critical thermal constraint, which in turn are associated with the machine electromagnetic performance, should be analysed and must be satisfied during optimal design. All these concerns will be presented in this study. Based on these, a procedure of the split ratio optimisation is proposed. It solely uses analytical equations which are derived in this study, hence it is simple and fast. A 250 kW, 25 krpm high‐speed PMSM is taken as a study case, and its optimisation results using the proposed procedure are validated with finite‐element analysis. Moreover, influence of the split ratio on various machine performances is discussed.

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Section: Stator Dimensionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Split ratio optimisation of high‐speed permanent magnet synchronous motor with multi‐physics constraints

Qin

Shen

2020

IET Electric Power Applications

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“…The iron loss which is related to B m will raise with an increase of rotational speed. When the iron loss cannot be ignored, B m and D s are optimized together [29]. Usually, D s can be expressed as the split ratio, which is the ratio of the stator laminations inner diameter D s to the outer diameter D o .…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of Dual‐Redundancy PM Brushless DC Motors for Torque Enhancement

Dong

Jiang

et al. 2020

IEEJ Transactions Elec Engng

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Non-member Zili He, Non-member Jinghui Xu, Non-member To enhance the torque of short-time duty permanent magnet (PM) dual-redundancy brushless DC motors (DR-BLDCM) and avoid the motor overheating under a fixed outer diameter and length, a design method based on the optimization of split ratio and stator magnetic density (B m) considering thermal limitations is presented. The global thermal limitation of DR-BLDCM is set by limiting loss density. The local thermal limitation of the winding is set by limiting current density. The thermal limitations are taken as the boundary of torque enhancement design optimization. Both the cold backup and hot backup DR-BLDCM are studied in this paper. By researching the relationship between torque, split ratio, and B m , the optimal combination of split ratio and B m are calculated analytically. The influences of thermal limitations on the maximum torque and the optimal combination are analyzed, and the principle to determine the optimal combination is obtained. The analytically calculated results are verified by finite element simulation, and the error is less than 6.82%. A prototype is manufactured based on analytical design results. The error between the calculated and measured copper loss is 6.96%. The verification results show that the proposed optimization method can fully enhance the torque of DR-BLDCM under the condition of fixed overall dimension and thermal limitations.

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“…By having proper magnet geometry and parallel magnetization, a decentred magnet rotor results a relative high of flux density, average torque and efficiency [16]. For a limited motor volume, determination of split-ratio also enhances electromagnetic torque capability although magnetic and electric loadings are crucial in the first place [17]. According to [18], optimization of magnet fraction, slot opening, airgap length, tooth body width, magnet thickness and number of coil turns result significant improvement in torque performance.…”

Section: Introductionmentioning

confidence: 99%

Torque improvement of PM motor with semi-cycle stator design using 2D-finite element analysis

Kwang¹,

Jamil²,

Jidin³

2019

IJECE

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This paper presents sizing approaches to improve output torque performance in PM motor when partial stator body is removed. As the output torque performance is directly proportional to the electric loading, Q, modification on stator geometry affects the output torque performance and special procedures have to be taken to restore the desired output torque capability. Influences of split ratio, tooth body width, airgap and magnet thickness of magnet in PM motor with asymmetry stator design are carried out and the performance verification are referred to the back-emf, average output torque, torque ripple as well as cogging torque. From the investigation using 2D-Finite Element Analysis, optimum size of tooth body width and optimum number of coil turns result better output torque while other sizing approaches result no significant change as quick saturation took place.

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Analytical determination of optimal split ratio for high-speed permanent magnet brushless motors

Cited by 11 publications

References 11 publications

Split ratio optimisation of high‐speed permanent magnet synchronous motor with multi‐physics constraints

Split ratio optimisation of high‐speed permanent magnet synchronous motor with multi‐physics constraints

Design Optimization of Dual‐Redundancy PM Brushless DC Motors for Torque Enhancement

Torque improvement of PM motor with semi-cycle stator design using 2D-finite element analysis

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