Split ratio optimization of high-speed permanent magnet synchronous machines based on thermal resistance network

Fan, Xinggang; Qu, Ronghai; Zhang, Bin; Li, Jian; Li, Dawei

doi:10.1109/icelmach.2016.7732806

Cited by 9 publications

(19 citation statements)

References 20 publications

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“…As can be seen from (17), the sleeve circumferential stress can be expressed as the function of split ratio. The value of circumferential stress depends on the sleeve material property (mass density and Young's modules), the interference fit, the operating speed, as well as the split ratio.…”

Section: Split Ratio Optimisation With Circumferential Stress Limitationmentioning

confidence: 99%

Split ratio optimisation of high‐speed permanent magnet brushless machines considering mechanical constraints

Feng

Wang

Guo

et al. 2018

IET Electric Power Applications

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The split ratio of rotor outer diameter to stator outer diameter is one of the most important design parameters due to its significant impact on machine torque density and efficiency. It has been optimised analytically in existing papers with due account given only for the thermal limitations. Here, the optimised split ratio for high-speed permanent magnet machines (HSPMM) with consideration of the mechanical constraints is investigated analytically. In addition, the influences of flux density ratio, maximum operating speed and sleeve material on the optimised split ratio are discussed in detail. The analytical results are verified by finite-element analyses. It is demonstrated that the optimised split ratio as well as the achievable torque of HSPMM is significantly reduced when the mechanical constraints are taken into consideration. The experimental results on a 6/ slot-4pole HSPMM confirm the validity of previous analyses.

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Section: Split Ratio Optimisation With Circumferential Stress Limitationmentioning

confidence: 99%

Split ratio optimisation of high‐speed permanent magnet brushless machines considering mechanical constraints

Feng

Wang

Guo

et al. 2018

IET Electric Power Applications

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“…Therefore, the branch 1 between the nodes 0 and 1 represents the water jacket or motor housing, and it has a different type of thermal resistor

R_{1}

, which is mainly of the thermal convection resistance.

R_{1}

can thus be calculated as [4]

R_{1} = \frac{1}{h_{conv} A_{conv}}

where

h_{conv}

is the heat transfer coefficient, and

A_{conv}

is the area of heat exchange over the range of the half‐tooth‐slot section. The heat transfer coefficient depends on the coolant type, coolant velocity, and the shape of the channel(s) of cooling jacket.…”

Section: Thermal Constraintmentioning

confidence: 99%

“…However, as mentioned previously, the loss limitation cannot eradicate local over‐temperature. Actually, although the designer's experience can help to decide the limitation of each type of power loss, the actual temperature distribution inside the machine is rather difficult to estimate accurately [4]. For the split ratio optimisation, reducing power loss is a preference, whilst avoiding over‐temperature is a critical constraint.…”

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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“…To limit the temperature of each part of the BLDCM more accurately, in Ref. [21,22], the analytical thermal model is used to derive the winding temperature expressions, and the split ratio is optimized to increase the torque with the winding temperature limitation. It can be seen from the above literature that some scholars have proposed that the global and local thermal limitations should be considered in the split ratio optimization for torque enhancement.…”

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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Split ratio optimization of high-speed permanent magnet synchronous machines based on thermal resistance network

Cited by 9 publications

References 20 publications

Split ratio optimisation of high‐speed permanent magnet brushless machines considering mechanical constraints

Split ratio optimisation of high‐speed permanent magnet brushless machines considering mechanical 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

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