AC Copper Losses Analysis of the Ironless Brushless DC Motor used in a Flywheel Energy Storage System

Li, Kai; Fu, Xinghe; Lin, Mingyao; Tai, Liuchen

doi:10.1109/tasc.2016.2602500

Cited by 28 publications

(15 citation statements)

References 6 publications

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“…As for the high power density PM BLDC motor topologies, there are some other types, such as motors with inner back-iron of the rotor [7], motors with dual-rotor [1], [23] and motors with Halbach-array PMs [16]. Different motor types have been used on its corresponding situations to satisfy the specific requirements.…”

Section: Prototype and Analytical Model A Prototype Of The Statomentioning

confidence: 99%

“…As an indispensable branch of permanent magnet (PM) brushless DC (BLDC) machines, the stator-ironless PM BLDC machines have attracted much attention from researchers for their higher efficiency, lower mass, higher torque density, longer lifespan and more environmentally friendly than traditional iron-stator PM BLDC machines. Thus, the stator-ironless PM BLDC machines have brought prospect in a diverse range of applications, such as, attitude control systems of microsatellite in the aerospace industry [1]- [4] and flywheel energy storage system [5]- [7], distributed generation, power system peak load regulation [8] and electrical vehicles [9].…”

Section: Introductionmentioning

confidence: 99%

“…The losses of the outer-rotor statorironless PM BLDC motor include two parts: the copper loss and the rotor eddy current loss. In general, the rotor eddy current loss is relatively small compared with the stator copper loss, and they are usually considered to be negligible in low-or moderate-speed stator-ironless PM BLDC motors [7]. However, the eddy current loss problem may be critical in high-speed PM BLDC motors equipped with surface-mounted PMs, in terms of the resulting temperature rise owing to the relatively poor heat dissipation from the rotor.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of a Stator-Ironless Brushless DC Motor With Non-Ideal Back-EMF

et al. 2019

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This paper deals with the effects of permanent magnets (PMs) shapes and segmentation types on the trapezoidal degrees of the back electromagnetic force (EMF) and torque characteristics and rotor losses. The back-EMF waveforms with different PMs shapes and segmentation types are calculated through transient finite element method (FEM). It is found that the effects of PMs inward eccentricity and curvature have no influence on the shape of the back-EMF waveforms. The PMs asymmetrical segmentation with the middle sub-PMs applied with low magnetic energy product sintered ferrite magnet can obtain better trapezoidal back-EMF waveforms. Then, the torque characteristics and rotor losses of PMs' symmetrical and asymmetrical segmentations are investigated and evaluated. The results show that the PMs segmentation and applying low magnet energy product PMs of the middle sub-PMs can further improve the torque characteristics. Moreover, the outer PMs eddy current loss and rotor iron loss exhibit a great extent of decrement. Finally, a stator-ironless PM BLDC motor without the outer rotor PMs segmentation is manufactured and tested. The experimental results show good agreement with the FEM ones. INDEX TERMS Stator-ironless, brushless DC (BLDC) motor, non-ideal back-EMF, rotor eddy current loss, permanent magnets (PMs) shape.

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Section: Prototype and Analytical Model A Prototype Of The Statomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of a Stator-Ironless Brushless DC Motor With Non-Ideal Back-EMF

et al. 2019

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“…It is found that the shunt wound structure with multiple wires method can effectively reduce the high-frequency additional loss caused by the skin effect [19]. The stator winding of HSPMG adopts the shunt wound structure with 11 wires, and the diameter of each wire is only 0.63 mm.…”

Section: Influence Of Itsc Fault On Copper Lossmentioning

confidence: 99%

Influence of inter‐turn short‐circuit fault on the loss of high speed permanent magnet generator with Gramme ring windings

Qiu

Zhao

Wei

et al. 2019

IET Power Electronics

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The primary problem brought by high speed is high-frequency loss. The loop current (LC) of inter-turn short-circuit fault causes serious distortion of the magnetic field in high speed permanent magnet generator (HSPMG), whose effects on the loss cannot be ignored. In order to reveal the influence mechanism of ITSC fault on the loss, the two-dimensional finite element model of the 117 kW, 60,000 rpm HSPMG is established. By comparing calculation results and test data, the accuracy of the model is verified. The distribution of the eddy current density is studied, and the fundamental reason for the sharp increase of eddy-current loss after fault is found. The core losses at different positions were obtained by segmenting stator core, and the variation mechanisms of core losses at different positions are revealed. The change of heat source distribution of stator core after fault is determined. The variation of winding copper loss after fault is analysed, and the influence degree of the LC on the fault phase and healthy phase copper loss is determined. In addition, because the temperature field is directly related to the loss, the research also laid a foundation for the next analysis of the temperature field.

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“…The computation of core loss and copper loss of coils has related mature method. The core loss [30][31][32][33][34][35] is calculated by loss coefficient method, while the copper loss [36][37][38][39][40][41][42][43] can be calculated by analysis method with AC effect considered. Besides, to measure the loss effectively and precisely, some improve modification of experiment has been proposed [44][45].…”

mentioning

confidence: 99%

The ECL Optimization and Experiment of HSPMSM with Improved Method

Liu¹

2018

Preprint

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-The eddy current loss should be optimized to be as less as possible for the stability of permanent magnet in high speed permanent magnet synchronous motor (HSPMSM) rotor and ensure the high efficiency and low temperature of the motor. This paper analyzes the eddy current distribution in rotor, with consideration of the conflict of the thickness of sleeve and diameter of the rotor, calculating the eddy current loss (ECL) and the thermal distribution via Separation of variables method for solving Maxwell's equations with analytical hieratical model of ECL constructed. The optimization result of ECL of the HSPMSM whose power and rated speed is 30kw 48000r/min can be got by multi-objective optimization method, combined weighting coefficient method and traversal algorithm based on chaotic local search particle swarm optimization (CLSPSO), utilizing ECL analytical model and other analytical constraints. Related experiment and measurement has been implemented with new approach of loss separation. Index Terms-eddy current loss, multi-objective optimization (MOO), electromagnetic analysis, equivalent hierarchical method

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AC Copper Losses Analysis of the Ironless Brushless DC Motor used in a Flywheel Energy Storage System

Cited by 28 publications

References 6 publications

Investigation of a Stator-Ironless Brushless DC Motor With Non-Ideal Back-EMF

Investigation of a Stator-Ironless Brushless DC Motor With Non-Ideal Back-EMF

Influence of inter‐turn short‐circuit fault on the loss of high speed permanent magnet generator with Gramme ring windings

The ECL Optimization and Experiment of HSPMSM with Improved Method

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