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Best Practices for Electric Motor Storage

Do What You Can To Protect The Investment

  • December 2020
  • Number of views: 4215
  • Article rating: 5.0
Trade press article — Electrical Business

Storing an electric motor for more than a few weeks involves several steps to ensure it will operate properly when needed.  Factors like temperature, humidity and ambient vibration in the storage area also influence the choice of storage methods, some of which may be impractical for smaller machines or need to be reversed before the motor goes into storage.

Long-term storage: Some points to keep in mind

  • February 2019
  • Number of views: 2753
  • Article rating: 4.0

It is common knowledge to those involved in the electric motor storage business that maintenance philosophies and procedures vary. Thorough reviews of available information on the topic of long-term storage from EASA and seven different motor manufacturers revealed some interesting similarities and differences in the information available from each source. Several sources share common elements such as environment, moisture protection, bearing maintenance, and insulation resistance. The purpose of our discussion here is to describe some of the differences and hopefully give some points to consider when creating a long-term storage process for end users.

Understand motor/system baselines

  • May 2017
  • Number of views: 3300
  • Article rating: No rating
Trade press article — Maintenance Technology

Vibration readings provide the best early warning of developing problems in a motor or system component. Other parameters to monitor may include operating temperature of critical components, mechanical tolerances, and overall system performance, including outputs such as flow rate, tonnage, and volume.

Common recommendations for stored motors

  • September 2013
  • Number of views: 2546
  • Article rating: 5.0

When an electric motor is expected to be stored for an appreciable time before it is placed into service, certain steps should be taken to ensure that it will be suitable for operation when it is needed. The practical limitation we need to recognize is that much of what we do when putting a motor into long-term storage has to be undone when the same motor is moved into operation. This article addresses common recommendations for stored motors.

Trickle heating is a practical option to prevent condensation

  • April 2006
  • Number of views: 3588
  • Article rating: No rating

Trickle heating is another very practical option to heat AC stator windings or DC field windings while they are not energized.

Special care needed to preserve stored motors

  • June 2003
  • Number of views: 2071
  • Article rating: No rating

Many service centers are also motor distributors, keeping a large stock of motors to sell. In addition, many hold motors in storage for specific customers as their spares. Many end-users also keep spare motors on site to keep production moving when a motor fails or needs an overhaul. In any of these cases, whether a motor is stored for a month or many years, there are certain steps that must be taken to ensure that as soon as a motor is taken out of storage, it will be in good condition.

Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.

This booklet covers topics such as:

  • Installation, startup and baseline information
  • Operational monitoring and maintenance
  • Motor and baseline installation data
  • How to read a motor nameplate
  • Motor storage recommendations



EASA/AEMT Rewind Study

EASA Rewind Study cover

The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.


ANSI/EASA AR100-2020

ANSI/EASA AR100-2015 cover

Recommended Practice for the Repair of Rotating Electrical Apparatus
This 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.



EASA Technical Manual

EASA Technical Manual cover

Revised May 2021
The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.