The Influence of Magnetization Pattern on the Rotor Losses of Permanent Magnet High-Speed Machines

Jang, Seok–Myeong; Cho, Han-Wook; Lee, Sungho; Yang, Hyun-Sup; Jeong, Yong Hwan

doi:10.1109/tmag.2004.832132

Cited by 33 publications

(6 citation statements)

References 5 publications

(7 reference statements)

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“…Due to the high frequency of the magnetic field alternating in the steel core lamination, iron loss can be significantly high as it is closely related to the power frequency [4]. Particularly, rotor eddy current loss is of great importance as such loss heats the rotor directly [5]. Furthermore, rotor overheating may reduce machine performance and lead to the demagnetization of magnets.…”

Section: Introductionmentioning

confidence: 99%

Power Loss and Thermal Analysis of a MW High-Speed Permanent Magnet Synchronous Machine

Zhang

McLoone

Cao

et al. 2017

IEEE Trans. Energy Convers.

111

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Abstract--High speed permanent magnet synchronous machines (PMSMs) have attracted much attention due to their high power density, high efficiency, and compact size for directdrive applications. However, the consequent power loss density is high, and hence heat dissipation is a major technical challenge. This is particularly the case for high-speed operation. In this paper, a MW level high speed PMSM is designed and its electromagnetic and mechanical power losses comprehensively investigated using finite element analysis. The transient machine demagnetization performance is studied, and a composite rotor structure is proposed to improve machine anti-demagnetization capability. The temperature distribution of the proposed high speed PMSM is also analyzed using a fluid-thermal coupling method with calculated power loss. Experiments conducted on a prototype of the high speed PMSM demonstrate the effectiveness of the numerical models developed and validate the results obtained.Index Terms--Demagnetization, finite element method, high speed PM machine, magnetic field, power loss, thermal analysis.

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Section: Introductionmentioning

confidence: 99%

Power Loss and Thermal Analysis of a MW High-Speed Permanent Magnet Synchronous Machine

Zhang

McLoone

Cao

et al. 2017

IEEE Trans. Energy Convers.

111

View full text Add to dashboard Cite

show abstract

“…The comparison is here performed under the point of view of the effect of the selected magnetization technique [10], on the potential transformed electromechanical power and to related energetic aspects [16], [17]. The justification of the attention for the argument is related to the strong differences in the magnetization process between the two solutions, under both technical and economic point of view.…”

Section: Fig 1 -Brushless Motor Under Exammentioning

confidence: 99%

PM fractional machines adopting bonded magnets: Effect of different magnetizations on the energetic performance

Ferraris

Pošković

et al. 2012

2012 IEEE International Energy Conference and Exhibition (ENERGYCON)

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The adoption of Permanent Magnets in small brushless machines for automotive applications is becoming frequent. Some research on bonded magnets is being carried on to substitute the ferrites. In the paper the parallel and radial magnetizations are considered: the different process complexity levels are analyzed and the effects on the iron losses and the energetic performances are evaluated by means of a simulation analysis and its experimental validation.

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“…The 2-pole rotor structure is preferred in the low-power ultra-high-speed applications due to a lower fundamental frequency which is easier for control and also beneficial to the reduction of stator iron loss and rotor PM eddy-current loss [1]- [4]. On the other hand, the 4-pole rotor is more inclined to be adopted for high-power high-speed applications due to reduced end-winding length and stator copper loss, which are quite advantageous for stator thermal equilibrium in high power application [5]- [8]. However, the relatively high fundamental frequency introduced by higher pole number will inevitably lead to higher rotor PM eddycurrent loss.…”

Section: Introductionmentioning

confidence: 99%

Fast calculation of carrier harmonic iron losses caused by pulse width modulation in interior permanent magnet synchronous motors

Zhu

Dong

et al. 2020

IET Electric Power Applications

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In this paper, the rotor stress is analysed for a highspeed permanent magnet (PM) machine (HSPMM) with segmented magnets retained by a carbon-fibre sleeve. The influence of rotor PM segmentation is firstly considered in the stress analysis. It is found that when the segmented magnets are under tensile stress, significant sleeve stress concentration will occur due to magnet edging effect. By contrast, the PMs will benefit from the segmentation with reduced tangential stress. This stress reduction effect is enhanced when the number of PM segments is larger. Furthermore, the influence of PM segmentation on the worst operating scenario is determined. In order to avoid stress concentration due to PM segmentation, the design guidelines are then given by investigating the influence of sleeve thickness and interference fit. A new design scheme of sleeve thickness is proposed based on the identified worst case scenarios. Finally, a 6-slot 4-pole high speed PM machine with segmented magnets retained by carbon-fibre sleeve is prototyped and tested at the speed of 90krpm. The rotor stability indirectly indicts the validity of the theoretical analysis and design scheme.

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The Influence of Magnetization Pattern on the Rotor Losses of Permanent Magnet High-Speed Machines

Cited by 33 publications

References 5 publications

Power Loss and Thermal Analysis of a MW High-Speed Permanent Magnet Synchronous Machine

Power Loss and Thermal Analysis of a MW High-Speed Permanent Magnet Synchronous Machine

PM fractional machines adopting bonded magnets: Effect of different magnetizations on the energetic performance

Fast calculation of carrier harmonic iron losses caused by pulse width modulation in interior permanent magnet synchronous motors

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