最终用户面包屑路径分隔符保持电机效率

What To Consider When Deciding to Repair Premium Motors

Is it better to repair or replace an electric motor that fails? 对于大多数工厂的工程师和维修人员, experience at测试 to the reliability of standard efficiency motors that have been repaired or rewound using industry best practices. Repair also can cost far less than replacement, especially if the motor has special features.

But some decision makers opt to replace failed premium efficient motors because they’ve “heard” these motors can’t be repaired without a loss of efficiency. 

那么，正确答案是什么呢? 原来，修理的决定, rewind or replace a failed premium efficient motor is not always so simple and straightforward as you may have heard.

阅读汤姆·毕晓普的完整文章，P.E., EASA Senior Technical Support Specialist, at Plant Engineering.

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2019年的倒带研究

2019年EASA/AEMT倒带研究封面The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors

发表: 2021年1月

In response to various opinions about the feasibility of maintaining motor efficiency during repair, 包括更换定子绕组, the Electrical Apparatus Service Association (EASA) and the Association of Electrical and Mechanical Trades (AEMT) conducted two comprehensive rewind studies using third-party testing laboratories. This study was a follow up to a similar study conducted 2003. This valuable publication explains the findings:

The 2019 study reaffirms the results of the 2003 study.
Motors can be repaired without reducing efficiency.

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保持电机效率的良好操作指南

良好实践指南- 2019年倒带学习-封面发表: 2021年1月

The original 2003 rewind study good practice guide has been editorially updated, with no substantive changes to any of the good practices. 主要针对服务中心人员, the guide which is now an independent document and not part of the complete EASA/AEMT rewind study report, outlines the good practice repair methods used to achieve the results given in both studies. 它包含维修技巧, 相关运动术语, and information about sources of losses in induction motors that affect efficiency.

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ANSI/EASA AR100-2020: Recommended Practice for the Repair of Rotating Electrical Apparatus

ANSI/EASA AR100-2020封面发表: 2020年9月

EASA’s “Recommended Practice for the Repair of Rotating Electrical Apparatus” is designated ANSI/EASA AR100 and was first approved as an American National standard in 1998. Since then it has been revised and approved four more times, in 2001, 2006, 2010, 2015年，现在是2020年. 

ANSI/EASA AR100 is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.

The scope of this document describes record keeping, 测试, analysis and general guidelines for the repair of induction, synchronous and direct current rotating electrical apparatus. It is not intended to take the place of the customer's or the machine manufacturer's specific instructions or specifications or specific accepted and applicable industry standards or recommended practices.

This document should be supplemented by additional requirements applicable to specialized rotating electrical apparatus including, 但不限于, 列出防爆, dust-ignition证明, and other listed machines for hazardous locations; and specific or additional requirements for hermetic motors, 氢冷机, 潜水电机, 牵引电机, 或1E级核发动机.

ANSI recognizes only one standard on a topic; therefore, the EASA Recommended Practice is the standard for repair of rotating electrical apparatus.

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Guidelines for 保持电机效率 During Rebuilding

发表: 2007年11月

This article provides guidelines that service centers can follow to retain the operating efficiency of the electric motors they rewind and rebuild. 它包括一个“做与不做”的清单。, safe values and correct procedures based on studies of variables that can impact the efficiency of rewound electric motors (core burnout temperature, 绕组设计, 轴承类型, 气隙, 绕组电阻, 等). 

This article was first published in May 1992; reviewed and revised as necessary in 2007年11月 by EASA's Technical Services Committee.

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你能修理节能电机吗? 也许.

An EASA-authored article that appeared on the Canadian Forest Industries website — www.woodbusiness.ca

Most plant engineers and maintenance staff can attest to the reliability of standard-efficiency motors that have been repaired or rewound using industry best practices. They also know repair can cost far less than replacement, 特别是当电机具有特殊功能时. 尽管如此, some of them hesitate to have failed energy-efficient motors (NEMA Premium models, in particular) repaired because they’ve heard it degrades efficiency.

那么，正确答案是什么呢? 是修理的决定吗, rewind or replace a failed energy-efficient motor as simple and straightforward as you may have heard?

本文的主题包括:

  • 是什么让电机更节能?
  • 修复后的电机效率
  • 检查电机应用
  • 灾难性故障(目前)
  • 灾难性故障(先前)
  • 转子条件
  • 机械零件状况
  • 采用汽车

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