Winding wire
By aligning the elongation properties of the conductive core and fibrous insulation through reduced winding pitch, the winding wire achieves improved tensile strength and resistance to failure, addressing the low strength issue in existing wires.
Patent Information
- Authority / Receiving Office
- RU · RU
- Patent Type
- Utility models
- Current Assignee / Owner
- OTKRYTOE AKTSIONERNOE OBSHCHESTVO VSEROSSIJSKIJ NAUCHNO ISSLEDOVATELSKIJ PROEKTNO KONSTRUKTORSKIJ I TEKHNOLOGICHESKIJ INSTITUT KABELNOJ PROMYSHLENNOSTI (VNIIKP)
- Filing Date
- 2026-04-02
- Publication Date
- 2026-07-09
AI Technical Summary
Existing winding wires for electric motor stators in submersible pumps suffer from low tensile strength due to mismatched elongation properties between the conductive core and fibrous insulation, leading to premature failure under tensile stress.
The winding wire design aligns the breaking elongation of the conductive core and fibrous insulation by reducing the winding pitch of the fibrous insulation to six to ten times the diameter of the conductive core, using materials like silk, lavsan, or nylon, and optionally incorporating an enamel layer.
This alignment enhances the mechanical strength of the wire, ensuring equal elongation of the core and insulation, thereby increasing the wire's tensile strength and resistance to failure under stress.
Smart Images
Figure 00000001_ABST
Abstract
Description
[0001] Field of technology to which the utility model belongs
[0002] The utility model relates to the field of electrical engineering, namely to insulated wires used for a high temperature class, which can be used for windings of electric motors exposed to elevated temperatures, in particular for stators of submersible pumps.
[0003] Technology Level
[0004] The prior art includes winding wires made from a conductive core over which fibrous insulation is applied (GOST 26606-85 "Wiring wires with enamel-fiber, fibrous, plastic, and film insulation. General specifications"). A disadvantage of these wires is their low tensile strength.
[0005] The essence of the utility model
[0006] The objective of the utility model is to create a winding wire with increased mechanical strength.
[0007] The utility model ensures the achievement of the following technical result: increasing the tensile strength by equalizing the tensile elongation of the conductive core and insulation made of fibrous material.
[0008] The specified technical result is also achieved by the fact that the winding wire with fibrous insulation contains a copper conductive core and an insulating layer made by winding a fibrous material, characterized in that the winding pitch of the fibrous material is from six to the diameters of the said conductive core.
[0009] The fibrous material is selected from the group: silk, lavsan, nylon.
[0010] The conductive core may contain an enamel layer.
[0011] A distinctive feature of the utility model is the winding of the conductive core with a pitch that ensures the alignment of the breaking elongation of the core and insulation.
[0012] List of drawing figures
[0013] Fig. 1 shows the cross-section of the wire.
[0014] Implementation of a utility model
[0015] In electrical engineering, there is a class of electrical machines that operate under extreme conditions—high temperatures, exposure to aggressive environments, and heavy loads. Submersible borehole pumps are an example of such machines.
[0016] Equipment operating in harsh conditions places increased demands on equipment. For example, the winding wires of submersible pump stators must be highly resistant to organic, aggressive environments (e.g., oil). The insulation of these wires must be as thin as possible to improve heat dissipation under current load. Minimal insulation thickness allows for a greater number of turns in the winding slots, which have a limited volume. This is especially necessary for electrical machines operating in confined spaces, such as wells. For such conditions, it is essential to ensure maximum specific power and performance.
[0017] The required mechanical and electrical properties are ensured primarily by the selection of insulating materials and the methods of applying the insulation.
[0018] In practice, wires with enamel-fiber or fiber insulation (for example, type PESH) have proven themselves well; they have high resistance to abrasion and increased loads associated with electrodynamic forces.
[0019] In existing fiber-insulated wires made of lavsan, silk, nylon, and other materials, the conductor is wrapped with fiber insulation at a large pitch (approximately 15 or more conductor diameters). As a result, the elongation of the fiber insulation at wire breakage is approximately 10-12% for silk and 20-25% for lavsan, while for a copper conductor this figure reaches 40%.
[0020] During operation of a winding wire with fiber insulation, the following situation occurs. Under the influence of tensile stress, the winding wire elongates. When the elongation percentage of the fiber insulation reaches, for example, 20%, the fiber insulation ruptures, and at this point, the load on the conductive core, which is in a state of plastic deformation, increases abruptly. This leads to the failure of the copper conductive core, even though it has not yet exhausted its strength reserve.
[0021] The proposed solution is based on aligning the deformation properties of the conductive core and the fibrous insulation. This is achieved by reducing the winding pitch of the fibrous insulation to six to ten times the diameter of the conductive core. With this winding pitch, the breaking elongation of the fibrous insulation material and the copper conductive core will be approximately equal, reaching 30-40%.
[0022] The winding wire contains a copper conductive core 1 with a diameter of 0.3 mm to 8 mm and a layer of fibrous insulation 2.
[0023] Depending on the requirements and operating conditions, the winding wire may contain an additional enamel insulating layer.
[0024] Example of implementation of the utility model.
[0025] Two samples of winding wire with silk fiber insulation were manufactured. The copper conductor diameter is 0.5 mm.
[0026] The winding pitch of the fiber insulation in the first sample was 10mm (twenty times the diameter of the conductive core), and in the second sample, the winding pitch of the fiber insulation was 5mm (ten times the diameter of the conductive core).
[0027] During the wire tensile test, the second sample withstood a force 15% greater than the first sample.
Claims
1. A winding wire with fibrous insulation, containing a copper conductive core and an insulating layer made by winding a fibrous material, characterized in that the winding pitch of the fibrous material is from six to ten diameters of the said conductive core.
2. The wire according to paragraph 1, characterized in that the fibrous material is selected from the group: silk, lavsan, nylon.
3. The wire according to paragraph 1, characterized in that the conductive core contains an enamel layer.