JB/T 51084-1999
Quality Grading of Permanent Magnet Alternators for Tractors and Internal Combustion Engines (Internal Use)
拖拉机、内燃机用永磁交流发电机 产品质量分等（内部使用）
Catalogue
前言 → 1 范围 → 2 引用标准 → 3 一般要求 → 4 产品质量分等 → 5 发电机产品质量等级指标 → 6 试验方法 → 7 检验规则 Foreword → 1 Scope → 2 Normative References → 3 General Requirements → 4 Product Quality Grading → 5 Quality Grade Indicators for Generators → 6 Test Methods → 7 Inspection Rules
Scope
This standard specifies the quality grading indicators, test methods, and inspection rules for permanent magnet alternators used in tractors and internal combustion engines. This standard applies to the quality inspection and grade evaluation of permanent magnet alternators (hereinafter referred to as generators) with nominal voltages of 6V and 12V for tractors, internal combustion engines, agricultural transport vehicles, etc.
本标准规定了拖拉机、内燃机用永磁交流发电机产品质量分等指标、试验方法和检验规则。本标准适用于拖拉机、内燃机、农用运输车等用标称电压为6V、12V永磁交流发电机（以下简称发电机）产品质量检测和等级评定。
Normative References
Keywords
Application Summary AI generated
Manufacturers and quality inspection agencies for tractors, internal combustion engines, and agricultural vehicles use this standard to grade the quality of permanent magnet alternators. They evaluate products as qualified, first-class, or premium based on indicators like durability, cold performance, overspeed, and high-temperature tests. This standard ensures reliability and consistency under various operating conditions, serving as a key reference for quality control and product certification.
拖拉机、内燃机和农用运输车的制造商和质检机构使用本标准来评定永磁交流发电机的质量等级。他们依据本标准中的耐久性、冷态性能、超速、高温等多项指标，将产品划分为合格品、一等品和优等品。该标准确保了发电机在不同工况下的可靠性和一致性，是产品质量控制和等级认证的重要依据。
AI Summary AI generated
This standard specifies quality grading requirements for permanent magnet alternators used in tractors and internal combustion engines, defining three grades: qualified, first-class, and premium. Key technical indicators include durability, cold performance, overspeed, high temperature, vibration, shock, voltage withstand, temperature cycling, damp heat, splash proof, interchangeability, and appearance/assembly quality. Test methods and inspection rules detail the testing procedures and sampling plans, providing a unified basis for generator quality evaluation.
本标准规定了拖拉机、内燃机用永磁交流发电机的产品质量分等要求，包括合格品、一等品和优等品三个等级。主要技术指标涵盖耐久性、冷态性能、超速、高温、振动、冲击、耐电压、温度变化、湿热、防溅、互换性及外观装配质量等。试验方法和检验规则详细规定了检测流程和抽样方案，为发电机的质量评定提供了统一依据。
Key Sentences extracted from text
发电机产品按技术水平和质量水平分为合格品、一等品和优等品。
发电机耐久性为合格品3 000h，一等品5 000h，优等品6 000h。
试验在23℃±5℃环境中进行，其输出电压、转速范围应符合表2规定，同时监视输出电流。
施加50Hz、550V正弦波电压，历时1min，无击穿。
在振动试验台上进行，振动频率为67Hz，最大加速度为110m/s2，振动方向和时间应符合表5的规定。
Generator products are classified into qualified, first-class, and premium grades based on technical level and quality level.
The durability of generators is 3,000h for qualified grade, 5,000h for first-class grade, and 6,000h for premium grade.
The test is conducted in an environment of 23°C±5°C, and the output voltage and speed range shall comply with Table 2, while monitoring the output current.
Apply a 50Hz, 550V sinusoidal voltage for 1 minute without breakdown.
The vibration test is performed on a vibration test bench with a frequency of 67Hz and a maximum acceleration of 110m/s², and the vibration direction and time shall comply with Table 5.
Standard Timeline
Changes from replaced version:
- 对原标准作了编辑性修改，主要技术内容没有变化
- Editorial modifications were made to the original standard, with no changes to the main technical content.