[Motor]: Comprehensive Interpretation of Motor Standard System

As the core device for converting electrical energy into mechanical energy, the motor serves as the 'heart' of nearly all modern fields, including industry, agriculture, transportation, household appliances, and even aerospace. Its performance, efficiency, reliability, safety, and interchangeability directly determine the operational quality of the entire system. To ensure that diverse and application-specific motor products meet unified technical requirements, enabling large-scale production, safe operation, and international trade, a comprehensive, scientific, and hierarchically structured standard system has emerged.

The motor standard system embodies the collective expertise of global technical experts. Through standardized terminology, testing methodologies, performance parameters, safety specifications, and interface dimensions, it establishes a unified technical framework for motor design, manufacturing, inspection, certification, and trade. For engineers, researchers, quality control professionals, and students in related fields, mastering this system is essential.

1. The standards of the China Electromechanical Industry Standardization Technical Committee (CESTC) do not emerge out of thin air. Their formulation, revision, and centralized management are undertaken by specialized technical committees. In China, standardization work in the electromechanical field is primarily carried out by the following national standardization technical committees (SAC/TC). Under the leadership of the National Standardization Administration Committee (SAC), they collaborate and divide responsibilities, forming the organizational core of China's electromechanical standardization.

Table 1-1: Summary of China's Major Motor Standardization Technical Committees 1.1 SAC/TC26 Rotating Motors This is the most core standardization committee in the motor field, with its work scope covering the vast majority of types of rotating motors. The secretariat is located at the Shanghai Electric Apparatus Research Institute, which is an important base for scientific research and standard formulation in China's electrical industry. TC26 has three sub-technical committees (SCs) to achieve more refined management: SC1 Low-power Motors: Focused on low-power motors, widely used in household appliances, office automation, medical devices, etc. The secretariat is located at China Electric Apparatus Research Institute Co., Ltd.

SC2 Generator: Specializing in large-scale power generation equipment such as steam turbine generators and hydro turbine generators, the secretariat is located at the Harbin Large Motor Research Institute, which serves as the technical hub for China's large motor and hydro turbine industries.

SC3 Heavy-Duty and Shielded Motors: Specializing in motors for harsh environments (e.g., lifting and metallurgical operations), with the Secretariat located at the Jiamusi Explosion-Proof Motor Research Institute.

1.2 SAC/TC2 Micro Motors This standardization committee operates independently from TC26, dedicated to standardizing micro and special motors (including micro motors and special motors). Micro motors, typically featuring compact size, low capacity, and modest output power, are widely used in control systems for signal conversion, actuation, or driving functions. The secretariat is located at the Xi'an Micro Motor Research Institute.

1.3 SAC/TC9/SC1 Explosion-proof Electrical Equipment/Explosion-proof Motors This is a sub-technical committee of SAC/TC9 (explosion-proof electrical equipment), specifically responsible for the standardization of explosion-proof motors. Explosion-proof motors are used in hazardous locations where explosive gases may exist (such as mines and petrochemical plants), with extremely high safety requirements. The Secretariat is located at the Nanyang Explosion-proof Electrical Research Institute, which is the authoritative institution in the field of explosion-proof electrical equipment in China.

Benchmarking internationally: The standardization committees of China have a clear corresponding relationship with the technical committees of the International Electrotechnical Commission (IEC). For example, SAC/TC26 and its SC1, SC2 mainly benchmark IEC/TC2 (rotary motors), while SAC/TC9/SC1 benchmarks IEC/TC31 (explosion-proof electrical equipment). This corresponding relationship ensures that China's national standards can actively adopt international standards during their formulation, promoting technical alignment and international trade.

2. Overview of the Motor Standard System. After understanding the organizational structure, we need to grasp the composition of the motor standard system from a macro perspective. Motor standards can be classified into two dimensions.

2.1 International standards classified by their establishing or supervising bodies: These standards, developed by international organizations such as IEC and ISO, aim to achieve global coordination and standardization.

National standards: formulated by national standardization bodies, such as China's GB standards, ANSI standards of the United States, DIN standards of Germany, etc.

Industry standards: Standards formulated for technical requirements that need to be unified within a specific industry nationwide but lack national standards, such as China's mechanical industry standards (JB), power industry standards (DL), etc.

Local standards: Standards formulated to meet specific technical requirements such as local natural conditions and customs, and applicable within the scope of provinces, autonomous regions, and municipalities directly under the central government.

Enterprise standard: The standard formulated by an enterprise to regulate its own product and technical activities, and its technical requirements are usually higher than the national standard or industry standard.

2.2 Classification by standard status and scope of application (hierarchical structure) This is key to understanding the internal logic of standards, typically forming a 'pyramid' structure: Basic standards: located at the top of the pyramid, specifying the most fundamental common requirements, such as terminology, symbols, units of measurement, tolerances, and fits. For example, GB 755 'Rotary Motors-Quotas and Performance' is the most core basic standard for China's rotary motors.

General standards: These apply to a broad category of products, covering common safety and performance requirements across multiple product types. For example, standards for motor noise limits, vibration measurement methods, and cooling methods.

General product standards: These are universal technical specifications for specific motor types, such as three-phase asynchronous motors.

Specialized product standards: These standards, located at the base of the pyramid, specify the most detailed technical requirements for motor products designed for specific applications and environments. Examples include the 'Technical Specifications for YZR Series Wound Rotor Three-Phase Asynchronous Motors for Lifting and Metallurgical Use' and the 'Technical Specifications for Brushless DC Motors for Washing Machines.'

3. International Motor Standard System In the present day of globalization, it is very important to know the international standard system. It is not only the bellwether of the development of technology, but also the 'pass' for the products to enter the international market.

3.1 Major International Standardization Organizations and Their Standards There are several authoritative international standardization organizations, whose standards have global influence.

Table 3-1: Major International Standardization Organizations and Their Standard Identification Codes Standard Identification Codes International Electrotechnical Commission (IEC) International Electrotechnical Commission (IEC) International Organization for Standardization (ISO) International Organization for Standardization (ISO) American Society for Standardization (ANSI) Institute of Electrical and Electronics Engineers (IEEE) National Electrical Manufacturers Association (NEMA) Underwriters Laboratories (UL) American Society of Mechanical Engineers (ASME) American Society for Testing and Materials (ASTM) European Committee for Electrotechnical Standardization (CENELEC) EN British Standards Institution (BSI) British Standards Institution (BSI) German Institute of Standardization (DIN) German Institute of Standardization (DIN) French National Association for Standardization (AFNOR) NF Japan Industrial Standards Committee (JISC) JISC JISIEC (International Electrotechnical Commission): The world's most authoritative international standard-setting body in the motor industry. Its IEC 60034 series 'Rotating Machines' standards serve as the primary reference for national standard development worldwide.

ISO (International Organization for Standardization) covers a broader scope. When its standards apply to motors (e.g., those in pumps or compressors), it typically collaborates with IEC.

The American system: The American standard system is relatively scattered, but it has great influence.

NEMA: Its NEMA MG 1 standard for 'Motors and Generators' is the dominant specification in the U.S. market, detailing motor performance, housing dimensions, insulation ratings, and other specifications. IEEE: Specializes in power systems, testing methodologies, and performance analysis. UL: Focuses on product safety certification, with its standards enjoying strong market recognition.

European System: To eliminate trade barriers, the EU has implemented a unified EN standard. CENELEC oversees the electrical and electronic sectors. These EN standards are typically derived from IEC standards and are mandatory across all EU member states.

National standards of various countries, such as DIN in Germany, BS in the UK, NF in France, and JIS in Japan, not only adopt international standards but also retain some distinctive technical requirements specific to their respective countries.

3.2 Conversion and Coordination of International Standards To facilitate international trade, countries generally adopt either 'direct conversion' or 'equivalent adoption' to incorporate international standards (particularly IEC standards) into their domestic standard systems.

A prime example is IEC 60034-1 'Rotating Machines-Part 1: Ratings and Performance', which specifies key parameters including power, voltage, frequency classes, as well as core concepts such as temperature rise, cooling, and operating cycles.

Table 3-2: Comparison of motor standard numbers for major industrial countries/organizations (taking IEC 60034-1 as an example) Country/Organization Standard Number International IEC 60034-1 EU EN 60034-1 Germany DIN EN 60034-1 (indicating the EN standard adopted by Germany) UK BS EN 60034-1 (indicating the EN standard adopted by the UK) France NF EN 60034-1 or NF C51-111 (France may have its own historical numbering) Japan JIS C 4034-1 China GB 755 From the table, it can be seen that the EU directly adopted IEC 60034-1 as EN 60034-1.

Germany, the UK, and France have adopted the EN standard as their national standard, with the national standard code prefixed to the number, such as DIN EN 60034-1.

Japan converted it into its own JIS C 4034-1.

China converted it into GB 755. It should be noted that in the early stages of converting IEC standards, China did not fully adopt IEC's numbering rules but instead assigned its own national numbering. However, as standardization efforts progressed, more and more new standards adopted numbering corresponding to IEC, such as IEC 60034-30, which deals with energy efficiency ratings. In China, its equivalent is GB/T 18613, and its technical content is consistent with IEC standards.

This conversion mechanism significantly enhances technical standardization, enabling a motor designed under IEC 60034-1 to meet the core performance requirements of most global markets.

4. Detailed Explanation of China's Motor Standard System 4.1 Classification of China's Motor Standards Based on the division of labor and standard hierarchy of the China Motor Standardization Committee, the China motor standard system can be clearly divided into: By product type: Large motor (generator) standards, small and medium-sized motor standards, low-power motor standards, lifting, metallurgical, and shielded motor standards, explosion-proof motor standards, micro and special motor standards. By standard status: General product standards, such as GB/T 28575 'YE3 Series Ultra-High Efficiency Three-Phase Asynchronous Motor Technical Conditions' and other series of motor technical conditions.

Specialized product standards include JB/T 10104 'Technical Specifications for Three-Phase Asynchronous Motors with YZR Series Winding Rotor for Hoisting and Metallurgical Applications' and GB/T 13500 'General Technical Specifications for Three-Phase Asynchronous Motors Used in Closed Refrigeration Compressors'.

Methods and standards: such as GB/T 1032 'Test method for three-phase asynchronous motors', GB/T 10068 'Mechanical vibration of motors with shaft center height of 56mm and above: Measurement, evaluation and limits of vibration'.

Safety and environmental standards: including GB 14711 'Safety Requirements for Small and Medium-sized Rotating Motors' and energy efficiency standards such as GB 18613 'Energy Efficiency Limits and Grades for Electric Machinery'.

Basic standards, such as GB 755 (aligned with IEC 60034-1), establish fundamental operational guidelines.

General Standard Product Standard 4.2 Naming Rules for China Motor Standards. Accurately interpreting the standard number is the first step in finding and using the standards. The naming of China standards has strict regulations.

For example, GB/T 18613—2020 specifies the efficiency limits and energy efficiency ratings for electric motors. The standard code, composed of uppercase Chinese pinyin letters, indicates the level and category of the standard.

Standard type code: 'T' indicates a recommended standard, while no 'T' indicates a mandatory standard. For example, 'GB' is a mandatory national standard, and 'GB/T' is a recommended national standard. Standard number: the sequence number of the release.

Standard release year: a four-digit number indicating the approval year of the standard version.

Standard name: Briefly describe the main content specified in the standard.

The spacing rules between sections are as follows: the standard code and the standard property code (if applicable) are followed by a space, then the standard number, followed by the hyphen '–', the year of publication, another space, and finally the standard name.

Table 4-1: Examples of China National Standard Codes Serial Number National Standard Type National Standard Code 1 Mandatory National Standard GB2 Recommended National Standard GB/T3 National Occupational Health Technical Standard GBZ4 National Military Standard GJB5 National Metrology Technical Specification JJF6 National Metrology Verification Regulation JJG In addition to national standards, common standards include: industry standards such as mechanical industry standards (JB, JB/T), power industry standards (DL), and automotive industry standards (QC/T).

Group standards: Developed by social organizations such as societies and associations, the code is usually an abbreviation of the group name, such as T/CEEIA XXX (China Electrical Industry Association Group Standard).

Enterprise standard: Add the enterprise code before the code 'Q/'.

5. Application and Development Trends of Motor Standards 5.1 Application Scenario Design and R&D: Standards provide fundamental parameters, performance metrics, and safety specifications for motor design, serving as the foundation and basis for design.

Production and manufacturing: The standards specify manufacturing processes, material selection, and inspection methods to ensure product quality consistency and stability.

Inspection and certification: Third-party testing and certification bodies (such as China's CQC certification and the EU's CE certification) conduct tests and evaluations of products based on standards, serving as the 'golden ticket' for products to enter the market.

Purchasing and Trade: In the procurement contracts and technical agreements, the reference to standards is the most concise and effective way to clarify the technical requirements of products, which can avoid disputes.

Maintenance and Repair: The standard provides technical guidance for the installation, commissioning, maintenance and repair of motors.

5.2 Current Development Trends of Motor Standards: High-efficiency and Ultra-high-efficiency: The global energy crisis and the 'dual carbon' goals have driven continuous upgrades in motor energy efficiency standards. The IEC 60034-30 series and China's GB 18613 standard have set increasingly higher requirements for motor energy efficiency levels, with IE4 and IE5 becoming mainstream and future-oriented standards.

Intelligentization and Digitalization: With the advancement of Industry 4.0 and the Internet of Things, standards are now encompassing motor condition monitoring, smart sensors, and data exchange interfaces. For instance, IEC 60034-27 and-30-2 standards address online testing and energy efficiency evaluation for variable frequency drive (VFD)-powered motors.

Materials and Reliability: The application of new insulation materials, permanent magnet materials and conductive materials has led to new testing methods and reliability evaluation standards.

Life cycle and sustainability: The standards are no longer focused on performance, but on the full life cycle of products, including ecological design, the use of renewable materials, recycling and other environmental requirements.

International coordination has been further strengthened: the consistency between national standards and international standards (especially IEC standards) is increasingly improving to reduce technical barriers to trade.

The motor standard system is a vast and sophisticated system engineering, which is both a summary of technological development and a guide for industry progress. From China's SAC/TC standard committee to international standards such as IEC and ISO