About Us
Double Dragon Group Shanghai Explosion-proof Motor Yancheng Co., Ltd. specializes in R&D, manufacturing, and service of explosion-proof motors. With three production bases in Shanghai, Jiangsu, and Zhejiang covering 150,000 m², its annual capacity reaches 7,000,000 kW.
公司严格按照IEC国际标准组织生产，已通过ISO 9001、ISO 14001、ISO 45001体系认证，产品获得CCC、CE、ATEX等国内外认证。主营普通电机、高压电机、防爆电机及压缩机专用电机，其中高压、防爆电机领域树立了良好的品牌口碑。
Products are widely used in petroleum, chemicals, coal, metallurgy, and power, and exported to over 20 countries and regions across Europe, Southeast Asia, the Middle East, Africa, and South America.
Our Core Strengths
With over a decade of professional expertise, the company has established a comprehensive quality control system covering R&D, procurement, production, logistics, and after-sales service, strictly adhering to ISO 9001 quality standards. Leveraging an experienced R&D team, mature production processes, and advanced testing equipment, we continuously translate technological achievements into productive outcomes to meet customers' growing demands for quality.
Technical Capabilities
Building on deep industry-university-research integration, the company maintains long-term partnerships with leading institutions such as Nanyang Explosion-proof Electrical Research Institute, Jiamusi Explosion-proof Research Institute, and Shanghai Electrical Apparatus Research Institute. Through sustained international technical exchanges, our products have achieved core technical indicators at globally advanced levels. This has made us the preferred OEM partner for several internationally renowned manufacturers, underscoring the market-proven quality and strength of our offerings.
Factory Campus Highlights
The 150,000-square-meter modern facility features smart production workshops, precision machining centers, and fully automated assembly lines. With a clean and orderly production environment, advanced digital management systems, and a professional technical team, the plant ensures end-to-end quality control from raw materials to finished products — a true embodiment of expertise and craftsmanship in industrial manufacturing.
Raw Material Supply
The company has established long-term strategic partnerships with high-quality suppliers both domestically and internationally. Key raw materials are sourced from industry-leading brands: silicon steel sheets are supplied by Baosteel and Wuhan Iron and Steel, bearings are selected from international brands such as SKF and NSK, copper materials are high-quality electrolytic copper meeting national standards, and insulation materials comply with Class F and H international standards. Coupled with a rigorous supplier evaluation and incoming material inspection system, this ensures stable and reliable product quality.
Baosteel Group
Wuhan Iron and Steel
SKF
NSK
Production Process
Process classification management
Based on the degree of impact on product quality, the production process implements a three-tier classified management system: special processes (stator core impregnation and baking, rotor aluminum casting, high-voltage motor frame welding), key processes (stator core stacking, rotor dynamic balancing, motor final assembly), and general processes (mechanical component machining and electrical work). Dedicated process specifications are established for each category, with certified operators performing the tasks and inspectors conducting full-process monitoring.
Quality Inspection System
Every motor undergoes comprehensive performance testing and documentation before leaving the factory. For mature products, regular sampling is conducted for full-performance testing at the laboratory station. New products and design changes undergo complete type tests—including electrical performance, vibration, and noise assessments—in accordance with the "Type Test Control Regulations."
Core Process Technologies
- Vibration Control: Spectrum analysis accurately locates vibration sources, optimizing rotor balance precision and structural design.
- VPI Insulation Process: High-voltage, high-power, and variable-frequency motors undergo vacuum pressure impregnation to ensure insulation performance and service life.
- Full-process Traceability: For motors of H315 and above specifications, full lifecycle tracking of major components is implemented to ensure zero-defect delivery.
