A sheet of anisotropic electrical steel and a method for controlling magnetic domains
Patent Information
- Application Number
- RU2025131296
- Authority / Receiving Office
- RU · RU
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2026-08-31
Claims
1. A sheet of anisotropic electrical steel in which in a section that is orthogonal to the direction of passage of the irradiation trace of the energy beam and parallel to the direction along the thickness of the sheet, in the case where an imaginary line is drawn in the sheet thickness direction including the position at which the elastic compressive stress measured using EBSD is 20 MPa or more, the degree of change in the elastic compressive stress on the imaginary line is 4 MPa or less per 1 μm over the entire area in the direction along the thickness of the sheet.
2. A sheet of anisotropic electrical steel according to paragraph 1, wherein, when it is assumed that the length of the irradiation trace of the energy beam in units of µm in the direction orthogonal to the direction of passage and the direction along the thickness of the sheet is the width W of the irradiation trace, and the widths W at five positions in one irradiation trace are W1, W2, W3, W4 and W5, average value of Wсред. , expressed by the formula (6) described below, satisfies the formula (7) described below: W сред. = (W1+W2+W3+W4+W5) / 5 (6); and 25 ≤ W сред. ≤ 200 (7).
3. A method for controlling magnetic domains for performing magnetic domain control in an anisotropic electrical steel sheet by irradiating the anisotropic electrical steel sheet with an energy beam while scanning the anisotropic electrical steel sheet in a direction that intersects the rolling direction of the anisotropic electrical steel sheet, wherein, when it is assumed that Ip is the power density of the energy beam in units of W / mm 2 , Ua - average irradiation energy density in units of mJ / mm 2 , d is the beam diameter in the scanning direction of the energy beam in units of mm and v is the scanning speed of the energy beam in units of m / s, Ip, Ua, d and v satisfy the formulas (1)-(3) described below: Ip ≤ 1500 (1); Ua ≥ 1.5 (2); and d / v ≥ 0.00010 (3).
4. The method for controlling magnetic domains according to paragraph 3, wherein Ip and Ua satisfy the formulas (4) and (5) described below: Ip ≤ 1000 (4); and Ua ≥ 2.5 (5).