Pulsed laser welding of laminated electrical steels

Cui, Ronggao; Li, Yongfeng

doi:10.1016/j.jmatprotec.2020.116778

Cited by 10 publications

(5 citation statements)

References 11 publications

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“…Both mechanical joining [ 44 , 48 , 49 , 50 ] and fusion welding [ 37 , 38 , 46 , 51 , 52 ] are widely used to join the laminated electrical steels at present. Senda et al [ 44 ] compared the effects of two representative V-type mechanical interlocking methods, dowel formation and dowel jointing on the magnetic properties of the joined ring core sample made of the electrical steel laminations, they found that two methods showed comparable contributions to iron loss increase at low frequencies (e.g., 50 Hz), whereas, increases in iron loss due to dowel jointing were greater than those due to dowel formation at high frequencies.…”

Section: The Representative Joining Methodsmentioning

confidence: 99%

Joining of the Laminated Electrical Steels in Motor Manufacturing: A Review

Xia

Wang

et al. 2020

Materials

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In recent years, the motor has been increasingly used to replace the conventional gasoline engine for carbon emission reduction, and the high-performance motor is urgently required. The stator and rotor in a motor are made of hundreds of joined and laminated electrical steels. This paper covers the current research in joining the laminated electrical steels for the motor application, together with the critical assessment of our understanding. It includes the representative joining method, modeling of the joining process, microstructure of the weld zone, mechanical strength and magnetic properties. The gaps in the scientific understanding, and the research needs for the expansion of joining laminated electrical steels, are provided.

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Section: The Representative Joining Methodsmentioning

confidence: 99%

Joining of the Laminated Electrical Steels in Motor Manufacturing: A Review

Xia

Wang

et al. 2020

Materials

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“…Laser welding is appealing for high-performance applications because it is suitable for an integrated manufacturing process and welding of high-alloy ESLs. Therefore, much research on the improvement and investigation of lamination welding has been carried out [24,33,52,58,[93][94][95][96][97][98][99][100][101][102][103][104][105].…”

Section: Welding Processmentioning

confidence: 99%

“…Continuous welding can either be linear or oscillating. Pulsed laser welding of ultra-thin ESLs is used to reduce iron loss while maintaining sufficient strength [97]. The concept of continuous welding and pulsed welding is illustrated in Figure 19.…”

Section: Laser Welding Typesmentioning

confidence: 99%

“…Because their thickness vary by up to 8% [112]. Also, in [97], it is illustrated that for non-oriented ESLs B27AHV1 the iron loss of welded laminations adopting pulsed laser welding has a 5.4-7.5% decr compared with that of continuous laser welding. In [104], as shown in Figure 21, a novel laser welding technique for ESLs is presen In [98], the classic pulsed welding is adapted to improve the magnetic properties and consumed energy of the stacking process.…”

Section: Laser Welding Typesmentioning

confidence: 99%

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A Review on the Effect of Electrical Steel Manufacturing Processes on the Performance of Electric Machines

Mahmouditabar,

Baker

2023

Energies

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The manufacturing processing of Electrical Steel Laminations (ESLs) for electric machines comprises cutting, stacking, and housing techniques which can result in plastic deformation and residual stress in the soft magnetic material. These manufacturing processes result in decreasing the magnetic quality and a local increase in both the static and dynamic hysteresis losses near the cut edges and consequently a reduction in the performance of the designed motor. The iron losses resulting from cutting can vary by a factor of two or more depending on geometrical, material, and processing parameters as well as the magnetic field strength. It is advantageous to consider these manufacturing effects in the design stage to reduce the probability of underperforming mass production. In this paper, the manufacturing processes of ESLs and their modelling methods are comprehensively surveyed. The gaps in scientific understanding and the research need for the expansion of accurate modelling of the cutting and joining of ESLs are subsequently discussed.

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“…The cutting methods for AA cores mainly include punching [ 10 ], laser-cutting [ 11 ], water-jet [ 12 ], and wire-cut electrical discharge machining (W-EDM) [ 13 ]. Celie et al [ 10 ] studied the performance of a high-speed motor formed by punched and laser-cut AA ribbons.…”

Section: Introductionmentioning

confidence: 99%

Research on Deterioration Mechanism and High-Precision Modelling of the Core Loss for Amorphous Alloys after Wire-Cut Electric Discharge Machining

et al. 2023

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Amorphous alloys (AAs) have the advantage of low core loss. Thus, they can be used in high-speed motor applications. However, compared with the nominal performances, the performance of the wire-cut electric discharge machine (W-EDM)-processed AA iron core changes significantly, which limits its popularization. This paper focuses on the performance degradation mechanism of the AA ribbon caused by W-EDM and establishes a modified core loss model after machining. First, a 308 × 15 mm ribbon-shaped AA sample machined by W-EDM was prepared. The characterization and analysis of the magnetic properties, phase, magnetic domain, nano-indentation, micro-morphology, and composition were carried out. In this paper, by analysing the variation in the magnetic domain distribution based on domain width and nano-mechanical properties, it is proposed that the performance degradation range of AA ribbons processed by W-EDM is within 1 mm from the edge. By comparing the microscopic morphology and chemical composition changes in the affected and the unaffected area, this paper presents a mechanism for the property deterioration of W-EDM-processed AA ribbons based on electrochemical corrosion. Finally, a modified loss model for W-EDM-processed AAs is established based on the division of the affected area. This model can significantly improve the accuracy of core loss estimation in the medium- and high-frequency bands commonly used in high-speed motors.

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Pulsed laser welding of laminated electrical steels

Cited by 10 publications

References 11 publications

Joining of the Laminated Electrical Steels in Motor Manufacturing: A Review

Joining of the Laminated Electrical Steels in Motor Manufacturing: A Review

A Review on the Effect of Electrical Steel Manufacturing Processes on the Performance of Electric Machines

Research on Deterioration Mechanism and High-Precision Modelling of the Core Loss for Amorphous Alloys after Wire-Cut Electric Discharge Machining

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