A compact three-dimensional transformer

By employing a compact three-dimensional transformer structure, multi-layer unequal thickness fully transposed windings, air ducts, and leakage flux recovery auxiliary windings, the performance degradation caused by reducing copper usage has been solved, achieving a comprehensive improvement in low loss, low temperature rise, and high short-circuit withstand capability.

CN122245939APending Publication Date: 2026-06-19GUANGZHOU GUANGGAO HV ELECTRIC APP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGZHOU GUANGGAO HV ELECTRIC APP CO LTD
Filing Date
2026-04-09
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

In existing dry-type transformer designs, reducing the amount of copper used will lead to an increase in the DC resistance of the windings, which in turn will increase the load loss and exacerbate the temperature rise, and it will be difficult to achieve the performance goals of low loss, low temperature rise and high short-circuit withstand capability at the same time.

⚗Method used

It adopts a compact three-dimensional transformer structure, including multi-layer unequal thickness, full transposition and axial phase-shifting design of low voltage winding and high voltage winding, combined with air-guiding channels and ultra-thin leakage magnetic recovery auxiliary winding, and with adaptive dynamic matching unit, to optimize current density and heat dissipation efficiency.

🎯Benefits of technology

While reducing the amount of copper used, the overall performance of the transformer is maintained or improved, losses are reduced, temperature rise is controlled, short-circuit withstand capability is improved, and a dynamic balance between performance and losses is achieved.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention relates to the field of transformer technology, specifically to a compact, three-dimensional transformer. The transformer body includes a low-voltage winding and a high-voltage winding coaxially sleeved from the inside to the outside of the transformer core column. The low-voltage winding is located between the core column and the high-voltage winding. The low-voltage winding includes at least two layers of copper foil arranged in parallel, each layer having a different thickness, and all layers of copper foil are fully transposed at the winding ends through transposition nodes. The low-voltage winding is divided into at least two segments along the axial direction, with adjacent segments having their parallel phases staggered through phase-shifting nodes. The high-voltage winding is divided into several segments along the axial direction, each segment having an ampere-turns number matching the corresponding axial interval of the low-voltage winding. The high-voltage winding is divided into several layers along the radial direction, each layer having a different conductor cross-sectional area, and all layers of conductors are fully transposed. By changing the structure of the low-voltage and high-voltage windings, the amount of copper used is reduced while maintaining sufficient performance.
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