Core Plate Manufacturing with Strained Annealing
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Solution Overview
Problem
Existing methods for manufacturing core plates with annular cores and teeth fail to align the easy magnetization direction of the core back in the circumferential direction, leading to deteriorated magnetic properties in the core back while maintaining good magnetic properties in the teeth.
Innovation Solution
A method involving punching, straining, and annealing steps to create a core plate with a band-shaped core back and parallel teeth, where compressive strain is applied to the core back to randomize the magnetization direction, preventing alignment with the teeth's extension direction and enhancing magnetic properties in the core back.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the easy magnetization direction in the core back is aligned in the extension direction of the teeth, then the manufacturing process is simple, but the core back becomes difficult to be magnetized in the magnetic circuit of the stator core
Solution Approach 1:
The patent implements local quality differentiation by specifying that the easy magnetization direction of the grain-oriented electrical steel sheet should be perpendicular to the extension direction of the teeth in the core back region. This local orientation optimization maintains manufacturing simplicity while ensuring the core back can be properly magnetized in the circumferential direction for effective magnetic circuit operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method improves magnetic properties in the teeth while preventing deterioration in the core back, allowing for high magnetic flux density and reduced hysteresis loss, suitable for stator cores in rotating electric machines.
Implementation Method 1
a core sheet strip is wound into an annular shape with the parallel teeth facing inward for obtaining the core plate having the core back and the teeth
Implementation Method 2
compressive strain in a plate thickness direction is applied to the band-shaped core back of the core sheet strip or the core back of the core plate by peening
Implementation Method 3
the band-shaped core back or the core back is annealed to be recrystallized after the applying of strain
Data Source
Figure 1(a)~1(e)
Figure 2~3
Figure 4(a)~4(e)
AI summary
A method is for manufacturing a core plate (1) having an annular core back (11) and teeth (12) extending from the core back toward the center (O). The core plate is obtained by performing a punching step, a winding step, a straining step and an annealing step. At the straining step, compressive strain is applied to the core back or the band-shaped core back (21) that is to be the core back after winding. At the annealing step, the core back or the band-shaped core back is annealed to be recrystallized after the applying of strain. Accordingly, the magnetic properties in the teeth can be improved, and deterioration of magnetic properties in the core back can be prevented.