polyester 130c magnet copper wire
- Core Features
- Key Components for Charging Facilities
- High-Efficiency Motor Upgrades
Polyester 130°C magnetic copper wire (standard model QZ-1/130 or QZ-2/130) is a magnet wire made by coating a copper conductor with polyester insulating varnish and baking it at high temperature. It has a heat resistance rating of B (130°C) and is widely used in windings for motors, transformers, relays, and other equipment.
I. Core Performance
1. Electrical and Mechanical Properties
High Conductivity: The copper conductor has a conductivity of 58×10²S/m, surpassing aluminum wire (37×10²S/m), ensuring low energy consumption and high efficiency.
Strong Adhesion: The polyester varnish film offers excellent mechanical strength, scratch resistance, and solvent resistance, making it suitable for high-speed winding processes.
Insulation Reliability: Online detection of pinhole and varnish particle defects ensures insulation uniformity, and the breakdown voltage meets industry standards.
2. Heat Resistance and Limitations
Heat Resistance: Long-term operating temperature 130°C, softening breakdown temperature 175°C, thermal shock test temperature 155°C.
Shortcomings: Poor heat shock resistance, easy to hydrolyze, avoid humid environments; use fluorine-containing materials (such as PVC) with caution in closed systems
| Features | Detailed description | Advantages |
| High thermal level | The temperature resistance level is 130°C (Class B). | Suitable for motors, transformers, etc. that require heat resistance higher than the normal 105°C (Class A) environment. |
| Excellent mechanical properties | It has good tensile strength and flexibility and is not easy to break or crack during the winding process. | Adapt to the needs of automated high-speed winding and improve production efficiency. |
| Cost-effective | Compared with high thermal grade (such as grade 155 and grade 180) enameled wire, the production cost is relatively low. | Under the premise of meeting the temperature resistance requirements, effectively control product manufacturing costs. |
| Stable electrical performance | The paint film is uniform and dense, with high insulation resistance and stable breakdown voltage. | Ensure the long-term stability and safety of electrical equipment. |
| Chemical resistance | It has certain resistance to general solvents and chemical reagents. | Suitable for various environments with impregnation varnish and insulating oil. |
III. Insulation Film Thickness Grade:
The insulation thickness of enameled wire directly determines its breakdown voltage and resistance to mechanical damage.
| Level Name | IEC standard code | NEMA MW 1000 code | Film Description | Main uses/features |
| Thin paint film | Grade 1 | Single Build | The paint film thickness is the thinnest. | Suitable for applications with extremely high space requirements, strict cable duct occupancy rate, or low voltage. |
| Standard paint film | Grade 2 | Heavy Build | The paint film thickness is moderate and is the most commonly used. | Suitable for most general purpose motors, transformers and coil windings, providing a good balance of electrical and mechanical protection. |
| Thick paint film | Grade 3 | Triple Build | The paint film thickness is the thickest. | Suitable for special windings requiring high voltage resistance, high mechanical strength, high wear resistance or in harsh operating environments. |
Note: Higher ratings require thicker insulation and higher breakdown voltage, but this also means a larger outer diameter wire, which affects the winding’s slot fill factor.
3. Conductor Diameter:
From ultra-thin 0.05 mm to thick 3.0 mm or even larger, the specific diameter should be determined based on the winding’s designed resistance, current density, and slot fill factor.
IV：Application
1. Micromotor Windings
Core Applications: Motor windings for household appliances such as air conditioner compressors, washing machine motors, and refrigerator fans. Its 130°C heat resistance and excellent adhesion make it suitable for high-speed winding processes.
Performance Matching: The scratch and solvent resistance of the polyester paint film ensures insulation reliability in vibrating environments.
2. Small Power Transformers
These small transformers, used in power adapters and chargers, meet Class B insulation requirements and offer significant cost-effectiveness.
3. Relays and Inductors
As the mainstream material for relay electromagnetic coils, it ensures stable electromagnetic conversion efficiency and dielectric properties.
It supports high-frequency current transmission in components such as inductors and ballasts.
4. Instrumentation and Electronic Control Systems
It is used in windings for industrial instruments (such as electricity meters and sensors), meeting the requirements of precision winding.
Signal transmission coils in motor controllers ensure both conductivity and insulation safety.
Transformer and power module windings for new energy vehicle charging stations are designed with a low-temperature curing process (130°C/15 minutes) to improve energy efficiency.
Auxiliary transformers in energy storage systems (such as battery management systems).
Industrial motors that meet E4/E5 energy efficiency standards. Flat-wire models (QZB) utilize a high aspect ratio design (>1.5) to increase slot fill rate and enhance power density.
V. Precautions
1. Confirm thermal rating requirements:
Ensure that the maximum operating temperature of the equipment does not exceed 130°C. If temperatures may be higher (e.g., exceeding 150°C), consider using higher thermal grade magnetic copper wire, such as polyesterimide (Grade 155) or polyamideimide (Grade 180/200).
2. Check the uniformity of the paint film:
High-quality enameled wire should have a uniform film thickness and a smooth surface, free of bubbles, pinholes, or mechanical damage, to ensure reliable insulation performance.
3. Consider the difficulty of paint stripping:
Polyester enameled wire typically requires removal using chemical solvents or mechanical scraping before soldering or connection. For applications requiring direct soldering (such as electronic components), a self-soldering enameled wire (such as polyurethane enameled wire) may be necessary.
4. Storage Environment:
Enameled wire should be stored in a dry, well-ventilated environment free of corrosive gases. Avoid direct sunlight and heavy pressure to prevent damage to the paint film and oxidation of the copper wire.
VI. Summary
Polyester 130°C magnetic copper wire, with its mature process and excellent cost-performance, continues to dominate the Class B insulation market. With the expansion of the new energy and high-efficiency motor markets, its upgraded products (such as low-temperature curing and hydrolysis-resistant modified types) will further expand its application boundaries.