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Method for manufacturing electrical steel sheet laminated core having reduced core loss and increased strength, and laminated core produced by the same

A technology of electrical steel sheets and laminated iron cores, applied in the field of laminated iron cores, can solve problems such as the limitation of firmly joining electrical steel sheets, achieve the effects of improving magnetic properties and preventing welding defects

Inactive Publication Date: 2016-02-10
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of using a large iron core to increase the output power of products such as motors, there is a limit to reducing the amount of welding heat input or the number of welding points
In addition, although plasma or laser welding has been proposed to reduce the welding heat input, this method has limitations in firmly joining electrical steel sheets

Method used

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  • Method for manufacturing electrical steel sheet laminated core having reduced core loss and increased strength, and laminated core produced by the same
  • Method for manufacturing electrical steel sheet laminated core having reduced core loss and increased strength, and laminated core produced by the same
  • Method for manufacturing electrical steel sheet laminated core having reduced core loss and increased strength, and laminated core produced by the same

Examples

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Effect test

example 1

[0060] A 0.35 mm thick strip of electrical steel sheet coated with chromium-containing insulating material and having 3 wt% silicon (Si) was punched to form electrical steel sheets, which were stacked to form laminations for motor stators. When the laminated part is pressed by the pressing cylinder under the pressure of 2MPa, the laminated part is welded by the TIG method using welding wire as the welding material. With 7.8×10 -7 STS310 solid wire with a resistivity of Ωm, a relative magnetic permeability of 1.003, a melting point of 1450° C. and a diameter of 0.9 mm was used as the welding wire. The welding wire of the comparative sample utilizes a 1.8×10 -7 It is made of 50kgf grade carbon steel wire with resistivity of Ωm, relative permeability of 1000 and melting point of 1529°C. Since the magnetic properties of the laminated core depend on the lamination factor of the laminated core, the same number of electrical steel sheets are stacked in each lamination section. Fou...

example 2

[0068] A 0.30 mm thick strip of electrical steel sheet coated with chrome-free insulating material and having 3 wt% silicon (Si) was punched to form electrical steel sheets, which were stacked to form laminations for motor stators. When the laminated part is pressed by the pressing cylinder under a pressure of 0.5 MPa, the laminated part is welded by the same TIG method as in Example 1 using welding wire as the welding material. With 7.8×10 -7 The resistivity of Ωm, the relative magnetic permeability of 1.003, the melting point of 1450°C and the STS310 solid wire with a diameter of 0.9mm and 7.2×10 -7 STS308L solid wire with a resistivity of Ωm, a relative magnetic permeability of 1.004, a melting point of 1419° C. and a diameter of 0.9 mm was used as the welding wire. The welding current was 50 A, the welding speed was 300 mm / min, the feeding speed of welding wire was 700 mm / min, and argon (Ar) as a shielding gas was supplied at a speed of 12.5 L / min. The laminated core man...

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Abstract

There are provided a method for manufacturing an electrical steel sheet laminated core having reduced core loss and improved strength, and a laminated core produced by the manufacturing method. The method includes: stacking electrical steel sheets to obtain a lamination; and welding an outer surface of the lamination, wherein during the welding, a welding wire having a resistivity of 6.5 x 10-7 Omegam or greater, a relative permeability of less than 1.02, and a melting point lower than that of the electrical steel sheets is used as a welding material.

Description

technical field [0001] The invention relates to a method for manufacturing a laminated iron core of electrical steel sheets with reduced core loss and increased strength, and a laminated iron core produced by the method. Background technique [0002] Electrical steel sheets include silicon (Si) and have good magnetic properties. This type of electrical steel sheet is used to form the cores of rotating machines such as motors and generators. During the manufacture of these cores, circular electrical steel sheets with a circular central opening are stacked one after the other and welded together. [0003] The electrical steel sheet used to form this laminated core is coated with an insulating material to reduce eddy current losses in the laminated core, and, due to its stamping process characteristics, has an organic-inorganic substance in which organic and inorganic substances are combined Composite coating materials are widely used to coat electrical steel sheets. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K9/167B23K9/23B23K37/04
CPCB23K9/167B23K9/23B23K9/0035B23K9/173B23K2101/36B23K2103/04B23K2103/22B23K35/3066B23K9/00B23K37/04B23K9/164H02K1/185H02K15/02
Inventor 严祥镐金清河金智铉奉元奭
Owner POHANG IRON & STEEL CO LTD
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