Specifications for particular types of winding wires - Part 37: Polyesterimide enamelled round copper wire, class 180, with a bonding layer CONSOLIDATED EDITION
1Key Takeaways
This part of IEC 60317 specifies the requirements of enamelled round copper winding wire of class 180 with a dual coating. The underlying coating is based on polyesterimide resin, which may be modified providing it retains the chemical identity of the original resin and meets all specified wire requirements. The superi…
2Expert Interpretation
An in-depth interpretation of the IEC 60317-37:2013+AMD1:2024 technical standard for Class 180 polyesterimide enameled round copper wire, covering double-coat structural requirements, thermal performance indicators, mechanical property test methods, and bonding layer performance specifications, applicable to motor winding manufacturing quality control.
Standard Overview and Technical Background
IEC 60317-37 is a key component of the International Electrotechnical Commission's series of standards for winding wire specifications. It specifically addresses the technical requirements for grade 180 polyesterimide enameled round copper wire. The second edition of this standard was released in 2013, and the revised edition, AMD1:2024, was released in June 2024, marking a significant advancement in the manufacturing technology for this type of winding wire.
Product Structure and Technical Characteristics
The winding wire specified in this standard utilizes a unique dual-coating design: a polyesterimide resin-based coating on the bottom layer and a thermoplastic resin adhesive layer on the top. This structural design ensures both heat resistance and excellent bonding properties, making it suitable for motor windings requiring automated winding and varnishing.
| Performance parameters | Grade 1B requirements | Grade 2B requirements | Test methods |
|---|---|---|---|
| Heat resistance grade | Grade 180 (temperature index ≥180) | IEC 60317-0-1 Clause 15 | |
| Thermal shock temperature | ≥200℃ | IEC 60317-0-1 Clause 9 | |
| Scratch resistance (0.25mm) | Average force ≥ 2.85N, single value ≥ 2.45N | Average force ≥ 4.70N, single value ≥ 4.00N | IEC 60851 related methods |
| Withstand voltage performance (180℃) | Complies with IEC 60317-0-1 requirements | IEC 60317-0-1 Clause 13 | |
Detailed explanation of key technical requirements
Thermal performance indicators
Class 180 insulation grade requires that the winding wire maintain stable electrical and mechanical properties in high temperature environments. The temperature index is not less than 180°C, the thermal shock test temperature is not less than 200°C, and the cut-through test requires no failure within 2 minutes at 300°C.
Mechanical performance requirements
The standard puts forward detailed requirements for the mechanical properties of the winding wire, especially the scratch resistance, which is graded according to the conductor diameter:
| Conductor diameter (mm) | Grade 1B average force (N) | Grade 1B single value force (N) | Grade 2B average force (N) | Grade 2B single value force (N) |
|---|---|---|---|---|
| 0.250 | 2.85 | 2.45 | 4.70 | 4.00 |
| 0.500 | ||||
| 1.000 | 6.75 | 5.75 | 10.9 | 9.20 |
| 1.600 | 9.20 | 7.80 | 14.3 | 12.1 |
Bond Properties
Bond properties are the core feature of this standard and provide both thermal and solvent bonding.
| Bond Type | Test Conditions | Polyamide Bonding Paint | Aromatic Polyamide Bonding Paint |
|---|---|---|---|
| Hot Bonding | Room Temperature Bonding Temperature | 200±2℃ | 230±2℃ |
| High Temperature Test Temperature | 155±2℃ | 170±2℃ | |
| Twisted Coil Bonding | Test Current(0.315mm) | 2.7±0.1A | 3.0±0.1A |
| Deflection force requirement | No breakage at 100N at room temperature, no breakage at 10N at elevated temperature | ||
Standard Implementation Recommendations
Key Quality Control Points
Manufacturers should focus on the following quality control steps: confirming the chemical consistency of the raw material resin, controlling the uniformity of the double-coating thickness, optimizing the thermal bonding process parameters, and comprehensive performance testing of the finished winding wire.
Test Method Selection
The standard explicitly requires the use of the test methods specified in IEC 60317-0-1:2013 and its amendment AMD1:2019. In the event of inconsistencies between parts of the standard, the requirements of IEC 60317-37 shall prevail.
Application Notes
Although the standard specifies a temperature index of 180, the actual operating temperature should be determined based on a comprehensive combination of factors such as the specific equipment type, operating environment, and operating conditions. The temperature index should not be simply equated with the recommended operating temperature.
Technological Development Trends
As motor equipment develops towards higher efficiency and miniaturization, the performance requirements for winding wire continue to increase. The 2024 revision of this standard added Article 23, a pinhole test requirement, reflecting the emphasis on insulation integrity testing. In the future, the specification requirements for environmentally friendly resin materials and high thermal conductivity winding wire may be further strengthened.
Declaration of Compliance
Winding wire products that comply with the IEC 60317-37 standard must be tested and marked in strict accordance with the standard requirements. Manufacturers must ensure that their products continue to meet the standard requirements until the standard stability date (see the relevant information on the IEC website for details). When selecting products, users should ensure that the products comply with the latest version of the standard requirements.