Standard No.:	JB/T 7076-2002
English Name:	Technical specification for YEZS range of double-speed conical-rotor brake three-phase induction motors for crane application
Chinese Name:	YEZS系列起重用双速锥形转子制动三相异步电动机技术条件
Professional Classification:	JB    Professional Standard - Machinery
Issued on:	2002-12-1
Implemented on:	2002-7-16
Status:	superseded
Superseded by:	JB/T 7076-2013 Specification for YEZS series double-speed conical-rotor braking three-phase induction motors for crane application
Superseded on:	2014-7-1
Language:	English
File Format:	PDF
Word Count:	5000 words
Price(USD):	120.0
Delivery:	via email in 1 business day

1. Scope This standard specifies the type, basic parameter, size, technical requirements, inspection rules, marking and packaging requirements of YEZS range of double-speed conical-rotor brake three-phrase induction motors for crane application. This standard is applicable to various double-speed conical-rotor brake three-phase induction motors for lifting machinery and other equipment (hereinafter referred to as “motor”). This standard can be implemented by reference for those motors derived from this range. 2. Normative References The provisions contained in the following normative documents, through reference in this text, shall constitute provisions of this Standard. For dated references, all of the subsequent amendments (excluding any amendments), or revisions are not applicable to this standard. However, the parties who enter into agreement according to this part are encouraged to research whether the latest editions of these documents may be applied or not. For undated references, the latest edition of the normative document is applicable to these specifications. GB/T 191-2000 Packaging-Pictorial Marking for Handling of Goods (eqv ISO 780:1997) GB 755-2000 Rotating Electrical Machines-Rating and Performance (idt IEC 60034-1:1996) GB/T 997-1981 Symbols for Types of Construction and Mounting Arrangements of Rotating Electrical Machinery (req IEC 60034-7:1972) GB/T 1032-1985 Test Procedure for Three-phase Induction Motors GB/T 1096-1979 Dimension of the Ordinary Square and Rectangular Keys GB/T 1993-1993 Rotating Electrical Machine-Cooling Methods GB/T 2423.4-1993 Basic Environmental Testing Procedures for Electric and Electronic Products-Test Db: Damp Heat, Cyclic GBfr 4772.1-1999 Dimensions and Output Series for Rotating Electrical Machines -Part 1: Frame Numbers 56 to 400 and Flange Numbers 55 to 1 080 (idt IEC 60072-1: 1991) GB/T4942.1-2001 Classification of Degrees of Protection Provided by Enclosures of Rotating Electrical Machines (IP Code) (idt IEC 60034-5:2000) GB 10068-2000 Mechanical Vibration of Certain Machines with Shaft Heights 56mm and Higher Measurement, Evaluation and Limits of Vibration (idt IEC 60034-14:1996) GB 10069.3-1988 Measurement of Airborne Noise Emitted by Rotating Electrical Machinery and the Noise Limits-Noise Limitsneq IEC 60034-9) GB 14711-1993 General Requirements for Safety of Small and Medium Size Rotating Electrical Machines (neq IEC 60034-1) JB/T 9615.1-2000 Test Methods of the Interturn Insulation on Random Wound Winding for AC Low-voltage Machines JB/T 9615.2-2000 Test Limits of the Interturn Insulation on Random Wound Winding for AC Low-voltage Machines 3. Type, Basic Parameter and Dimension 3.1 The protection rating of motor casing is IP54; and the protection rating of fan casing and brake carrier is IP22 (see GB/T 4942.1-2001).

1. Scope 2. Normative References 3. Type, Basic Parameter and Dimension 4. Technical Requirements 5. Inspection Rules 6. Marking and Packing Appendix A (Normative) Determination Method for the Characteristic Curve of Axial Magnetic Pull Appendix B (Normative) Determination Method of Static Braking Torque Appendix C (Informative) Determination Method of Motor Air Gap