An improved winding wire for water filled submersible motor and method manufacturing thereof

The winding wire design with polyimide-FEP and BOPP layers addresses the limitations of conventional wires by enabling operation at high temperatures and voltages, enhancing motor performance and reliability.

WO2025243315A1PCT designated stage Publication Date: 2025-11-27VOLTSON INDIA
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Patent Information

Application Number
PCT/IN2025/050297
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-05-18
Filing Date
2025-02-28
Publication Date
2025-11-27

AI Technical Summary

Technical Problem

Conventional submersible winding wires for water-filled motors fail to withstand high temperatures (up to 200°C) and high voltages (up to 6600 V), leading to reduced lifespan, increased derating, decreased efficiency, and compromised survival during voltage fluctuations and dry motor runs.

Method used

A winding wire design featuring a copper conductor coated with polyimide-fluorinated ethylene propylene (FEP) film and a Biaxially Oriented Polypropylene (BOPP) layer, optimized for insulation and thermal stability, allowing the wire to operate at up to 6600 V and withstand temperatures up to 200°C.

Benefits of technology

The improved winding wire enhances motor lifespan, reduces derating at higher temperatures, increases efficiency, and improves survival during high/low voltage conditions and dry motor runs, with superior insulation and mechanical durability.

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    Figure IN2025050297_27112025_PF_FP_ABST
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Abstract

The present invention relates to an improved winding wire (10) for water-filled submersible motors capable of withstanding extreme temperature conditions and suitable for up to 6600 V motor comprises a copper conductor (1) and a plurality of insulating layers (2 & 3) coated around the copper conductor; wherein, said insulating layers consist of a polyimide-fluorinated ethylene propylene (FEP) film (2) and a Biaxially Oriented Polypropylene (BOPP) layer (3) The thickness and number of layers of the insulating materials vary based on the desired voltage rating. The winding wire provides effective insulation, thermal stability, and resistance to harsh environments, making it suitable for submersible motor applications.
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Citation Information

Patent Citations

  • Modified polypropylene and polypropylene-insulated water proof winding wires

    CN1059616A

  • Insulated winding wire

    US9324476B2

  • Insulated winding wire

    US9543058B2