Quantifying Effects of Cutting and Welding on Magnetic Properties of Electrical Steels

Bourchas, Konstantinos; Stening, Alexander; Soulard, Juliette; Broddefalk, A.; Lindenmo, Magnus; Dahlen, M.; Gyllensten, Freddy

doi:10.1109/tia.2017.2698400

Cited by 39 publications

(24 citation statements)

References 28 publications

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“…However, the effect seems to diminish towards the magnetic saturation. Similar results are observed when the effect of welding was studied on rectangular steel strips with Epstein frame test setup [20].…”

Section: B Parameter For Welding Loss Modelsupporting

confidence: 82%

Effects of Manufacturing Processes on Core Losses of Electrical Machines

Sundaria

Lehikoinen

Arkkio

et al. 2021

IEEE Trans. Energy Convers.

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Manufacturing processes such as cutting, welding and shrink fitting are known to degrade the magnetic properties of the electrical sheet during the manufacturing of electrical machines. These effects are often neglected at the design stage and lead to large errors in the simulated and measured core losses of the electrical machine. This paper studies the comparative impact of different manufacturing processes on the stator core losses of a typical industrial motor. Both simulations and measurements indicate a significant impact of manufacturing processes on the stator core losses. A dummy blocked rotor test setup is used to measure the stator core losses. As a result of different manufacturing processes, the stator core losses increased by 23% in the studied machine at the rated condition. The effect on the stator core losses was higher at lower flux levels. Finally, it was shown that the inclusion of the effect of manufacturing processes significantly improved the simulation accuracy of the core losses. A quantification and segregation of the effect of cutting, welding and shrink fitting is also presented for the studied machine.

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Section: B Parameter For Welding Loss Modelsupporting

confidence: 82%

Effects of Manufacturing Processes on Core Losses of Electrical Machines

Sundaria

Lehikoinen

Arkkio

et al. 2021

IEEE Trans. Energy Convers.

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“…The stator cores are made of laser-cut silicon steel laminations with 0.50 mm thickness bonded and stacked together using the backlack technology [17]. This leads to intrinsically stable and robust laminated stacks ( Figure 22) with no need for clamping plates and devices that would increase the machine dimension w indicated in Figure 14b.…”

Section: Prototype Manufacturingmentioning

confidence: 99%

Design, Prototyping and Testing of a Rotating Electrical Machine With Linear Geometry for Shipboard Applications

et al. 2020

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Conventional rotating electrical machines are characterized by stator and rotor structures featuring a cylindrical geometry around the shaft rotational axis. Although advantageous for mechanical reasons, the cylindrical geometry results in overall machine shapes and dimensions that may be unsuitable for installation. This particularly occurs in shipboard applications, where electric motors and generators are subject to stringent room constraints and need to be fit in unusually shaped compartments. This paper presents the development and test of a dual-shaft rotating permanent-magnet electric machine prototype having a linear structure that facilitates its onboard use for such applications as electric propulsion and rudder actuation. In fact, the proposed machine topology has overall dimensions which can be adjusted to fit the space available for installation. The operating concept and the detailed electromechanical design of the machine are first described. Then the manufacturing and factory test of the prototype under inverter supply are illustrated. Finally, the validation of the prototype as a boat propulsion variable-speed inverter-fed motor is presented. It is proved that, despite of its highly non-conventional electromechanical design, the machine can be effectively fed from a general-purpose inverter for permanent magnet motors.

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“…cutting, punching, stamping and welding, as a result of mechanical and thermal residual stress [7]. Additionally, punching and cutting could lead to microscopic edge burrs around the punched holes or at the cut edge, and can cause low inter-laminar resistance, electrical contact and hence inter-laminar fault (ILF) between the laminations [2], [8][9][10][11][12]. ILF leads to circulating eddy currents between the defective laminations, which cause hot spot and extra localised power loss at the defective zone.…”

Section: Introductionmentioning

confidence: 99%

“…ILF detection and condition monitoring of the magnetic cores have been an active area of research and interesting topic for designers and manufacturers of the electrical steels and laminated magnetic cores. In this regards, practical methods have been introduced and successfully employed to evaluate ILF of rotating machines [4][5][6][7][8][9][10][11][12] and transformers [13][14][15][16], and other magnetic devices with laminated cores. An overall review of these methods is performed in [1].…”

Section: Introductionmentioning

confidence: 99%