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GB/T 21971-2020 English PDF

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Q: Should I purchase the latest version GB/T 21971-2020?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 21971-2020 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

US$259.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 21971-2020: YZD series multi-speed three-phase induction motors for crane application. Technical specification
Status: Valid

GB/T 21971: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21971-2020	259	Add to Cart	3 days	YZD series multi-speed three-phase induction motors for crane application. Technical specification	Valid
GB/T 21971-2008	599	Add to Cart	3 days	Technical specification for YZD range of multi-speed three-phase induction motors for crane application	Obsolete

Similar standards

GB/T 39631 GB/T 12665 MT/T 575 GB/T 21974 GB/T 21972.1

Basic data

Standard ID: GB/T 21971-2020 (GB/T21971-2020)
Description (Translated English): YZD series multi-speed three-phase induction motors for crane application. Technical specification
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: K26
Classification of International Standard: 29.160.30
Word Count Estimation: 14,172
Date of Issue: 2020-11-19
Date of Implementation: 2021-06-01
Older Standard (superseded by this standard): GB/T 21971-2008
Quoted Standard: GB/T 191; GB/T 755; GB/T 756; GB/T 757; GB/T 997; GB/T 1032; GB/T 1096; GB/T 1958; GB/T 1971; GB/T 1993; GB/T 4772.1; GB/T 4942.1; GB/T 10068; GB/T 10069.1; GB/T 10069.3; GB 20237; GB/T 21975; GB/T 22719.1; GB/T 22719.2
Regulation (derived from): National Standard Announcement No. 26 of 2020
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies the type, basic parameters and dimensions, technical requirements, test methods, inspection rules, marking, packaging and warranty period of YZD series multi-speed three-phase asynchronous motors for hoisting. This standard is applicable to multi-speed three-phase asynchronous motors (frame number 112250) for electric power transmission of various hoisting machinery (hereinafter referred to as "motors"), and all series of motors derived from this series of motors can be implemented by reference.

GB/T 21971-2020: YZD series multi-speed three-phase induction motors for crane application. Technical specification

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(YZD series multi-speed three-phase asynchronous motors for hoisting technical conditions) ICS 29.160.30 K26 National Standards of People's Republic of China Replace GB/T 21971-2008 YZD series multi-speed three-phase asynchronous motors for lifting Technical conditions 2020-11-19 released 2021-06-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Foreword Ⅰ 1 Scope 1 2 Normative references 1 3 Type, basic parameters and dimensions 1 4 Technical requirements 5 5 Test method 8 6 Inspection rules 9 7 Marking, packaging and warranty period 10

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 21971-2008 "YZD series of multi-speed three-phase asynchronous motors for hoisting technical conditions", and GB/T 21971- Compared with.2008, the main technical changes are as follows. ---Added references to GB/T 756, GB/T 1958, GB/T 1971, GB/T 22719.1, GB/T 22719.2, GB/T 21975, Deleted GB/T 2423.4-1993, GB/T 13306-1991, JB/T 9615.1-2000, JB/T 9615.2-2000 (see Chapter 2, Chapter 2 of the.2008 edition); ---Added motor model and example description (see 3.1); ---Modified the D1 size of table 3 frame size 180L (see table 3, table 3 of the.2008 edition); ---Modified table 3 K basic size and position tolerance for frame sizes 160M~225M (see Table 3, Table 3 of the.2008 edition); --- Modify the key width tolerance of the shaft extension key in Table 4 (see Table 4, Table 4 of the.2008 edition); ---Added "The deviation of any one phase of the DC resistance of the motor three-phase stator winding in the actual cold state from the three-phase average value should not exceed ±2% of the average value. "(See 4.9); ---Added "At 40°C ambient temperature, the cold insulation resistance value of the motor stator winding should not be less than 5MΩ." (see 4.10); --- Added "1s test can also be used instead, but the test voltage value should be 120% of the specified value." (see 4.11); --- The regulations on the unevenness of the air gap of the motor have been deleted, and the inspection of the unevenness of the air gap has been cancelled accordingly (see the.2008 edition 4.15); ---Modified the requirements for motor vibration and noise (see 4.15 and 4.16, 4.16 and 4.18 in the.2008 edition); --- Deleted the electric motor alternating damp heat test requirements (see.2008 version 4.17); ---Added the requirements of motor reliability (see 4.20); ---Added the requirements for the direction of rotation of the motor (see 4.21); ---Added the motor appearance and assembly quality requirements (see 4.23); ---Added the test of the motor project (see 4.24); --- Change Chapter 6 into tabular representation (see Chapter 6, Chapter 5 of the.2008 edition). This standard was proposed by China Electrical Equipment Industry Association. This standard is under the jurisdiction of the National Standardization Technical Committee for Rotating Electrical Machines (SAC/TC26). Drafting organizations of this standard. Jiamusi Explosion-proof Motor Research Institute, Jiamusi Motor Co., Ltd., Henan Benyu Motor Technology Co., Ltd., Shanxi Motor Manufacturing Co., Ltd., Foshan Nanhai Jiuzhou Puhui Fan Co., Ltd., Jiangxi Gongbu Machinery Co., Ltd., Anhui Province Motor Product and Parts Quality Supervision and Inspection Center, Anhui Wannan Electric Co., Ltd. The main drafters of this standard. Wang Liping, Li Gang, Guo Wenqing, Hou Zhijian, Xiao Hongbin, Tu Guobin, Zhao Yunfeng, Wenming. The previous versions of the standard replaced by this standard are as follows. ---GB/T 21971-2008. YZD series multi-speed three-phase asynchronous motors for lifting Technical conditions

1 Scope

This standard specifies the type, basic parameters and dimensions, technical requirements, and test methods of YZD series multi-speed three-phase asynchronous motors for hoisting. Laws, inspection rules and signs, packaging and warranty period. This standard applies to multi-speed three-phase asynchronous motors (frame size 112~250) (hereinafter referred to as "electric Motor”), all series of motors derived from this series of motors can be implemented by reference.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 191 Packaging, Storage and Transportation Graphic Mark GB/T 755 Rotating motor rating and performance GB/T 756 Cylindrical shaft extension of rotating motor GB/T 757 Conical shaft extension of rotating electric machine GB/T 997 Classification of structure type, installation type and junction box position of rotating electric machine (IM code) GB/T 1032 Three-phase asynchronous motor test method GB/T 1096 Ordinary flat key GB/T 1958 Product Geometric Technical Specification (GPS) Geometric Tolerance Testing and Verification GB/T 1971 Rotating motor wire end marking and direction of rotation GB/T 1993 Rotating electric machine cooling method GB/T 4772.1 Rotating electric machine size and output power rating Part 1.Frame size 56~400 and flange number 55~1080 GB/T 4942.1 Degree of protection of the overall structure of rotating electrical machines (IP code) Classification GB/T 10068 The measurement, evaluation and limit of mechanical vibration of motors with a shaft center height of 56mm and above GB/T 10069.1 Rotating electrical machine noise measurement method and limit value Part 1.Rotating electrical machine noise measurement method GB/T 10069.3 Rotating electrical machinery noise measurement method and limit Part 3.Noise limit GB 20237 Safety requirements for lifting metallurgy and shielded motors GB/T 21975 Three-phase asynchronous motor reliability test method for lifting and metallurgy GB/T 22719.1 Inter-turn insulation of scattered windings of AC low-voltage motors Part 1.Test methods GB/T 22719.2 Inter-turn insulation of scattered windings of AC low-voltage motors Part 2.Test limits 3 Type, basic parameters and dimensions 3.1 The model description is as follows. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 21971-2020_English be delivered?

Answer: Upon your order, we will start to translate GB/T 21971-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 21971-2020_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 21971-2020_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 21971-2020?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 21971-2020 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.