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Are you familiar with the key techniques for stacking transformer core laminations? Perhaps not everyone is aware of these specifics. Therefore, this article is dedicated to introducing this specialized knowledge, allowing you to study with focus and apply it effectively to better utilize cores and transformers. The specific content is as follows.
The key operational points for transformer core lamination stacking are mainly as follows:
Preparation and Inspection: Be thoroughly familiar with the drawings and quality requirements. Prepare all necessary materials and tools for the operation. Conduct quality inspections on the laminations and remove any that do not meet the standards.
Dimensional Tolerance: The parallelism of the upper and lower clamps, as well as the diagonal error, should be controlled within 1mm.
Stacking Sequence: Laminations are generally stacked two at a time, including center column pieces, in the sequence of "Center, Left, Right." Every three layers complete one cycle. After stacking one grade (step), conduct a self-inspection. If the thickness exceeds 15mm,整形 (shaping/leveling) should be performed to meet the specified requirements.
Handling Thickness Variations: If the lamination thickness is uneven, separate them and place them on the upper part of the core column at each level to avoid affecting the core column. Sometimes three pieces can be stacked together, but ensure there is sufficient allowance
Surface Selection: For the top and bottom surface laminations of each level, select those with better quality. When stacking the final three levels, install temporary fasteners to prepare for final tightening.
Spacer Blocks: Foot pads and spacer blocks should be made from dried miscellaneous wood. If the dimensions are unsuitable, trim them to fit tightly against the end face of the lower yoke of the core.
Clamping Sequence: When clamping the core, start from the center and then move to the two ends.
Cleaning and Painting: Blow clean the core body using compressed air, then apply paint. However, pay attention not to paint the upper yoke.
Anti-Rust Protection: For parts not painted, apply anti-rust oil for protection.
Handling Care: Handle laminations gently; do not throw, strike, or bump them, and certainly do not step on them to avoid damage.
Edge Consistency: The protruding edges (lapping joints) of the laminations should remain uniform and consistent.
Final Testing: After stacking, conduct tests. If qualified, hang a "Pass" tag; if不合格 (unqualified), hang a "Fail" tag to prevent confusion.
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