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Vibration and Alignment

  • April 2020
  • Number of views: 3795
  • Article rating: No rating
Webinar recording bundle

A special discounted collection of 9 webinar recordings focusing on a wide variety of vibration, balancing and alignment topics.

Just $45 for EASA members!

ANSI's New Shaft Alignment Standard

  • July 2018
  • Number of views: 2512
  • Article rating: No rating
Webinar recording

This presentation introduces you to ANSI's new shaft alignment standard.

Achieving proper alignment by detecting and correcting soft foot

  • May 2016
  • Number of views: 3678
  • Article rating: 5.0

Proper alignment of direct-coupled machinery is an essential element in reliability of a new or repaired machine (motor, pump, gear case, etc.). One common impediment to achieving proper alignment and smooth operation is a “soft foot” condition. This article looks at detecting soft foot, correcting soft foot and general recommendations for shims.

Logrando una alineación adecuada detectando y corrigiendo el pie suave

  • May 2016
  • Number of views: 4099
  • Article rating: No rating

Realizar una correcta alineación de las máquinas acopladas de forma directa es un elemento esencial para garantizar la confiabilidad de operación de una máquina nueva o reparada (motor, bomba, caja de engranajes, etc.). Uno de los impedimentos comunes para lograr una alineación adecuada y un correcto funcionamiento, es el denominado  "pie suave".

Preventive and predictive maintenance of electric motors

  • January 2015
  • Number of views: 2271
  • Article rating: No rating

We often hear the terms preventive maintenance (PM) and predictive maintenance (PdM) of electric motors. However, it’s far less often that we give consideration to the tasks associated with these methods of maintaining motor operation and extending operating service life. This article will address some of the more common activities associated with PM and PdM, with the focus on three-phase squirrel cage motors.

Understanding end play and its impact on axial alignment

  • February 2013
  • Number of views: 7863
  • Article rating: 4.5

End play in an electric motor is the amount of axial movement allowed by the motor's construction. This end play is limited by the motor's bearing design. The bearing's primary purpose is to locate the shaft radially so it can be aligned to the driven equipment shaft and efficiently transmit torque to the load. It is also important that the axial location be controlled such that the motor and driven equipment bearings are not subjected to excessive thrust or vibration and still have room for thermal growth of the shaft as it heats up during operation. This can be accomplished by a number of ways depending on the design of the motor. If the motor has sleeve bearings, axial movement is expected within the limits of the bearing design. Most rolling element bearings have much less axial clearance but must be contained in the bearing housing to control the end play. This article looks at:

  • Sleeve bearings
  • Axial hunting
  • Ball bearings

Base support and alignment: How understanding construction of the frame can help minimize motor vibration

  • February 2008
  • Number of views: 1540
  • Article rating: No rating

When vibration problems occur, the magnitude and direction of the vibration can give a good indication of where to look for the cause. When vibration is higher in the vertical plane, one of the first things we should examine is the base/foundation of the motor. If the high vertical readings are compounded by indications of an eccentric airgap, such as high axial vibration and a predominant twice-line-frequency vibration, a "soft foot" or twisted frame is often to blame.

Pitfalls of applying generally accepted coupling manufacturers' alignment tolerances

  • February 2005
  • Number of views: 1997
  • Article rating: No rating

Shaft couplings are devices that connect two rotating shafts together. They efficiently transfer motion and power from the drive unit to the driven unit without adversely impacting either piece of rotating equipment. Under ideal conditions, both shafts should function as a continuous unit. The design of a flexible coupling is to accommodate small amounts of shaft misalignment. Coupling manufacturers have designed their couplings to withstand the forces resulting from excessive shaft misalignment. Unfortunately, shaft alignment tolerances have sometimes been governed by the coupling manufacturers' design specifications.

A case study: Alignment often can be the source of vibration problems

  • June 1999
  • Number of views: 1226
  • Article rating: No rating

EASA Technical support provides help with one company's experience with vibration following the repair of a 2-pole motor the centrifugal blower it drives.

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.