Detail of GB/T 12350-2022

Introduction of GB/T 12350-2022

Safety requirements of small power motors 1 Scope This standard specifies the general safety requirements of small power motors. This standard is applicable to the small power motors specified in GB/T 5171.1 (hereinafter referred to as “motors”), and other similar motors also may be implemented by making reference thereto. 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 755 Rotating electrical machines - Rating and performance GB/T 1971 Rotating electrical machines - Terminal markings and direction of rotation GB/T 2423.3 Environmental testing - Part 2: Testing method - Test Cab: Damp heat, steady state GB/T 2423.4 Environmental testing for electric and electronic products - Part 2: Test method - Test Db: Damp heat, cyclic (12h+12h cycle) GB/T 2423.55 Environmental testing for electric and electronic products - Part 2: Test methods - Test Eh: Hammer tests GB/T 2900.25 Electrotechnical terminology - Rotating electrical machines GB/T 2900.27 Electrotechnical terminology - Small-power motor GB/T 3667.1-2016 AC motor capacitors - Part 1: General - Performance, testing and rating - Safety requirements - Guide for installation and operation GB/T 3667.2-2016 AC motor capacitors - Part 2: Motor start capacitors GB/T 4207 Method for the determination of the proof and the comparative tracking indices of solid insulating materials GB 4343.1 Electromagnetic compatibility requirements for household appliances, electric tools and similar apparatus - Part 1: Emission GB 4706.1 Household and similar electrical appliances - Safety - Part 1: General requirements GB/T 4942 Degrees of protection provided by the integral design of rotating electrical machines (IP code) - Classification GB/T 5169.5 Fire hazard testing for electric and electronic products - Part 5: Test flames - Needle test method - Apparatus confirmatory arrangement and guidance GB/T 5169.11 Fire hazard testing for electric and electronic products - Part 11: Glowing/hot-wire based test methods - Glow-wire flammability test method for end-products (GWEPT) GB/T 5169.16 Fire hazard testing for electric and electronic products - Part 16: Test flames - 50 W horizontal and vertical flame test methods GB/T 5169.21 Fire hazard testing for electric and electronic products - Part 21: Abnormal heat - Ball pressure test method GB/T 5171.1 Small power motors - Part 1: General technical requirements GB/T 5171.21 Small power motors - Part 21: General test methods GB/T 5171.22 Small-power motors - Part 22: Test methods for permanent magnet brushless DC motors GB/T 9651 Test procedures for single-phase induction motor GB/T 9816.1-2013 Thermal-links - Part 1: Requirements and application guide GB/T 12113-2003 Methods of measurement of touch current and protective conductor current GB/T 12665 Requirements of damp-heat testing of electrical machine for service in general environmental condition GB/T 14536.1 Automatic electrical controls for household and similar use - Part 1: General requirements GB/T 14536.3-2008 Automatic electrical controls for household and similar use - Particular requirements for thermal motor protectors GB/T 16842 Protection of persons and equipment by enclosures - Probe for verification GB/T 17626.2 Electromagnetic compatibility - Testing and measurement techniques - Electrostatic discharge immunity test GB/T 17626.4 Electromagnetic compatibility - Testing and measurement techniques - Electrical fast transient/burst immunity test GB/T 17626.5 Electromagnetic compatibility - Testing and measurement techniques - Surge immunity test GB/T 17948.1 Rotating electrical machines - Functional evaluation of insulation systems - Test procedures for wire-wound windings - Thermal evaluation and classification GB/T 17948.2 Functional evaluation of insulation systems for rotating electrical machines - Test procedures for wire-wound windings - Classification of changes and insulation component substitutions JB/T 6742 The commutator of small power motors JB/T 9547-2011 Specification for centrifugal starting switch use of single-phase motor JB/T 13609 Specification for electronic starting switcher used for single-phase motors IEC 60384-14: 2016 Fixed capacitors for use in electronic equipment - Part 14: Sectional specification - Fixed capacitors for electromagnetic interference suppression and connection to the supply mains 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 2900.25, GB/T 2900.27, GB 4706.1 and GB/T 5171.1, as well as the following, apply. 3.1 creepage distance minimum path distance along the surface of insulating material between two conductive parts or between a conductive part and the accessible surface 3.2 clearance minimum spatial distance between two conductive parts or between a conductive part and the accessible surface 3.3 enclosure accessible motor surface, including the surface of such parts as motor junction boxes, but excluding accessible parts 3.4 component special accessories for motor Example: centrifugal switch, capacitor, thermal protector, etc. 3.5 insulator part used to insulate and support a conductor 3.6 diameter of motor diameter measured on the excircle of the motor stator housing, but excluding the dimensions of radiation rib, junction box and welding seam of the motor 3.7 pollution degree numeral characterization of the expected pollution degree of the micro-environment Note: Pollution degree 1: No pollution, or only dry non-conductive pollution exists, which has no effect. Pollution degree 2: Normally only non-conductive pollution occurs. Occasional temporary conductive pollution caused by condensation must be expected. Pollution degree 3: Conductive pollution or dry non-conductive pollution that becomes conductive due to condensation occurs. Pollution degree 4: Persistent conductive pollution is caused, for instance, by conductive dust or by rain or snow. 3.8 basic insulation insulation applied to live parts to provide basic protection against electric shock 3.9 supplementary insulation independent insulation other than basic insulation, which is applied to protect against electric shock in case of failure of basic insulation 3.10 double insulation insulation system consisting of basic insulation and supplementary insulation 3.11 reinforced insulation single insulation applied to live parts which provides electric shock protection level equivalent to double insulation under conditions specified hereof 3.12 functional insulation insulation provided between live parts with different potentials only for the inherent function of motor 3.13 maximum loss point operating point where the maximum loss occurs when the motor runs from no load to the rated load point 3.14 working voltage maximum voltage withstood by the considered part when motor runs normally at the rated voltage Note 1: The effects of different positions of controller and switchgear are considered.

Contents of GB/T 12350-2022

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Marking and instructions 5 Frame and enclosure 6 Mechanical assembly and parts 7 Corrosion resistance 8 Electrical connection 9 Connectors 10 Internal wiring 11 Electrical insulation support 12 Evaluation of insulation structure 13 Brush holder 14 Non-metal parts 15 Clearance and creepage distance 16 Grounding 17 Temperature rise test 18 Abnormal test 19 Durability test 20 Insulation resistance and electrical strength 21 Leakage current at working temperature 22 Damp heat test 23 Start 24 Components 25 Electromagnetic compatibility 26 Other requirements 27 Inspection rules Annex A (Normative) Centrifugal switch Annex B (Normative) Motor-run capacitor Annex C (Normative) Motor-start capacitor Annex D (Normative) Motor thermal protector Annex E (Normative) Thermal link Bibliography Figure 1 Measuring circuit for leakage current of single-phase motor at working temperature Figure 2 Measuring circuit for leakage current of three-phase motor at working temperature Table 1 Tensile test of cord Table 2 Cross-sectional area of wire to be connected by wiring terminal Table 3 Torque test Table 4 Minimum heat resistance temperature of lead wires for internal wiring Table 5 Minimum clearance of motor Table 6 Minimum creepage distance for basic insulation Table 7 Temperature rise test limit Table 8 Maximum allowable winding temperature in abnormal test Table 9 Durability test time Table 10 Voltage value on megohmmeter Table 11 Overspeed test conditions Table 12 Enclosure port Table 13 DC power input/output ports Table 14 AC power input/output ports Table 15 AC power input port Table 16 Inspection items