Design of a 50000 rpm high-speed high-power six-phase PMSM for use in aircraft applications

Lahne, Hans-Christian; Gerling, Dieter; Staton, D.A.; Chong, Yew Chuan

doi:10.1109/ever.2016.7476345

Cited by 16 publications

(11 citation statements)

References 25 publications

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“…where γ SL is the specific density of the sleeve material. Due to the inaccuracy of the simplified model, a safety factor K s = 2 has been introduced for the maximum stress value tolerated by the sleeve material [14]. The total sleeve hoop stress σ SL = σ t, PM + σ t, SL must be less than or equal to the yield strength of the material divided by the safety factor…”

Section: Automatic Calculation Of Retaining Sleeve Thicknessmentioning

confidence: 99%

Maximisation of power density in permanent magnet machines with the aid of optimisation algorithms

Cupertino

Leuzzi

Monopoli

et al. 2018

IET Electric Power Applications

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This study considers the design of surface-mounted permanent magnet electrical machines for high-speed applications and proposes a methodology to determine the maximum achievable power density. Power density is usually improved by increasing rotational speed. At high speed, a mechanical retaining system for the rotor magnets must be considered. As the speed increases, the thickness of the retaining sleeve becomes larger, reducing torque capability. There will be an optimal speed at which the output power will be maximised. Both structural and electromagnetic design must be considered simultaneously to properly address this design problem. To simplify the design procedure, static finite-element simulations are used for the electromagnetic analysis and analytical formulae are employed for retaining sleeve sizing. The procedure is aided by multi-objective optimisation algorithms. A case study based on the specification of an aeronautical actuator is presented. The performances that can be obtained using different iron cores, high-grade silicon steel, and cobalt iron steel are compared. Finally, results obtained from transient finite-element electromagnetic and structural analysis are presented to validate the feasibility of the proposed procedure.

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Section: Automatic Calculation Of Retaining Sleeve Thicknessmentioning

confidence: 99%

Maximisation of power density in permanent magnet machines with the aid of optimisation algorithms

Cupertino

Leuzzi

Monopoli

et al. 2018

IET Electric Power Applications

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“…Since the contribution from the rotor-shaft part is much lower than the other two, with the aim of finding a closed-form expression for the sleeve dimensioning, the detailed calculations of the rotor hoop stress have been neglected. An increased security factor K s = 3 has been employed, in order to reduce the risk of a bandage failure as presented in [14]. By imposing the total sleeve hoop stress (σ SL ) to be less than the yield stress of the material (σ y,SL ) divided by the security factor K s…”

Section: Automatic Calculation Of Retaining Sleeve Thicknessmentioning

confidence: 99%

“…The titanium alloy considered in this study has a yield strength equal to 840 MPa, and the safety factor is equal to three. The displacements of the sleeve could be reduced by filling up the space among the magnets with a material whose coefficient of thermal expansion is close to the magnet material properties [14]. A verification of the required interference among rotor parts in the whole speed and temperature range would complete the rotor design.…”

Section: Fea Verification Of the Analytical Mechanical Modelmentioning

confidence: 99%

Design Procedure for High-Speed PM Motors Aided by Optimization Algorithms

et al. 2018

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This paper considers the electromagnetic and structural co-design of superficial permanent magnet synchronous machines for high-speed applications, with the aid of a Pareto optimization procedure. The aim of this work is to present a design procedure for the afore-mentioned machines that relies on the combined used of optimization algorithms and finite element analysis. The proposed approach allows easy analysis of the results and a lowering of the computational burden. The proposed design method is presented through a practical example starting from the specifications of an aeronautical actuator. The design procedure is based on static finite element simulations for electromagnetic analysis and on analytical formulas for structural design. The final results are validated through detailed transient finite element analysis to verify both electromagnetic and structural performance. The step-by-step presentation of the proposed design methodology allows the reader to easily adapt it to different specifications. Finally, a comparison between a distributed-winding (24 slots) and a concentrated-winding (6 slots) machine is presented demonstrating the advantages of the former winding arrangement for high-speed applications.

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“…The PM demagnetization caused by the rotor temperature rise seriously threatens the safety and reliability of the high-speed motor. It is necessary to precisely calculate the eddy current losses and optimally design the rotor structure in order to reduce the rotor eddy current losses and temperature [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of the Rotor Structure of a HSPMSM Based on Analytic Calculation of Eddy Current Losses

Liang

Liu

2017

Energies

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Abstract:The rotor eddy current losses of a high-speed permanent magnet synchronous motor reduce the efficiency of the motor and increase the temperature rise of the rotor. In severe cases, the permanent magnet of the rotor can be demagnetized, affecting the safe operation of the motor. In this paper, an analytical model of rotor eddy current losses calculation based on Maxwell equations is introduced. The eddy current losses of rotor structures, e.g., protection sleeve, shield layer and permanent magnets, are analyzed. The calculation results of rotor eddy current losses are compared with two-dimensional (2D) finite element analysis. The comparison verifies the accuracy and versatility of analytical calculation. Finally, the influences of the variables on eddy current losses in the derived model are analyzed. Based on the principle of minimizing eddy current losses, an optimized structure with copper layers covering both inner and outer surfaces of the protective sleeve is proposed. Furthermore, the optimized distribution parameter of copper film thickness is obtained.

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Design of a 50000 rpm high-speed high-power six-phase PMSM for use in aircraft applications

Cited by 16 publications

References 25 publications

Maximisation of power density in permanent magnet machines with the aid of optimisation algorithms

Maximisation of power density in permanent magnet machines with the aid of optimisation algorithms

Design Procedure for High-Speed PM Motors Aided by Optimization Algorithms

Optimal Design of the Rotor Structure of a HSPMSM Based on Analytic Calculation of Eddy Current Losses

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