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Get your bearings: Electric motor lubrication 101

How often should electric motors be lubricated? How can you be sure you’re using the right amount? Here’s your primer.

  • June 2019
  • Number of views: 4231
  • Article rating: No rating
Trade press article — Plant Services

This article looks at the factors that go into determining how often a motor should be lubricated and how much lubricant they should recieve.

Cantidad y frecuencia de lubricación de los rodamientos de motores eléctricos

  • January 2019
  • Number of views: 5096
  • Article rating: 5.0

Las consideraciones para la cantidad y la frecuencia de lubricación de los rodamientos de motores eléctricos ( y generadores) incluyen lo siguiente:

  • ¿El lubricante es aceite o grasa?
  • ¿El tipo de rodamiento es un cojinete de deslizamiento o un rodamiento de bolas o rodillos?
  • Si es un rodamiento de bolas ¿Tiene sellos, obturaciones o es abierto? En este artículo trataremos todo lo anterior dividiéndolo en las siguientes categorías:
  • Cantidad de grasa y frecuencia de lubricación para rodamientos de bolas y rodillos (rodamientos de elementos rodantes).
  • Frecuencia de lubricación y nivel de aceite (relacionado con la can- tidad) para rodamientos de bolas y rodillos.
  • Frecuencia de lubricación y nivel de aceite (relacionado con la cantidad) para cojinetes de deslizamiento.

Dado que la lubricación con grasa de cojinetes de deslizamiento es muy rara, este tema no se incluye en este artículo. Además, ya que los rodamientos sellados no se pueden relubricar, este tema tampoco está incluido.

Electric motor bearing lubrication frequency and quantity

  • January 2019
  • Number of views: 4440
  • Article rating: 5.0

Considerations for lubrication frequency and quantity for electric motors (and generators) include the following:

  • Is the lubricant grease or oil?
  • Is the bearing type sleeve, ball or roller?
  • If it is a ball bearing, is the enclosure open, shielded or sealed?

This article addresses the above by breaking them down into the following categories:

  • Grease lubrication frequency and quantity for ball and roller (rolling element) bearings.
  • Oil lubrication frequency and level (relates to quantity) for ball and roller bearings.
  • Oil lubrication frequency and level (relates to quantity) for sleeve bearings.

Understand vertical motor bearings

Vertical motors differ from horizontal units in various ways, including their oil-leak risks

  • April 2018
  • Number of views: 4391
  • Article rating: 5.0
Trade press article — Efficient Plant

Bearing construction is a key difference between vertical motors and horizontal motors that are mounted vertically. Vertical motors typically drive pumps using thrust bearings. Horizontal motors rarely have those types of bearings. Understanding relevant construction and configuration factors is crucial when confronting lubrication-related issues that can be associated with vertical-motor bearings.

Variety of oil leaks and repair options explained

  • July 2016
  • Number of views: 3686
  • Article rating: No rating

In oil-lubricated machines, leaks are a frequent and difficult-to-diagnose and correct condition. Due to design issues, there may even be a few machines where oil leaks are simply part of the landscape and not correctable without major modifications. Topics discussed in this article include:

  • Overfilling
  • Checking/replacing sight glasses
  • Proper venting of labyrinth seals
  • Checking/repairing stand tubes (stand pipes)
  • Proper sealing
  • Examining condition of oil sumps
  • Draining oil before transporting
  • Oil foaming
  • Checking vibration levels
  • Checking to see if motor is running off electrical center

Variedad de fugas de aceite y explicación de las opciones de reparación

  • July 2016
  • Number of views: 3630
  • Article rating: No rating

En las máquinas lubricadas con aceite, las fugas son una condición frecuente y difícil de diagnosticar y de solucionar. Debido a problemas de diseño, incluso pueden existir unas pocas máquinas en las cuales las fugas de aceite simplemente forman parte del paisaje y no se pueden corregir sin realizar grandes modificaciones.

Los temas tratados incluyen :

Llenado excesivo de aceite
Verificación/reemplazo de los visores de aceite
Ventilación adecuada de los sellos de laberinto
Verificación/reparación de los tubos de presión (stand-pipes)
Sellado apropiado
Verificación del estado de los depósitos de aceite
Drenaje del aceite antes del transporte
Formación de espuma en el aceite
Comprobación de los niveles de vibración
Verificación para ver si el motor está trabajando fuera de su centro magnético

Vertical Motor Maintenance & Repair

  • July 2013
  • Number of views: 1576
  • Article rating: 5.0
Convention presentation

Vertical motors are unique in their ability to carry external thrust. The thrust bearings that make this possible require care in assembly and application for optimum service and performance. Oil bath lubrication in vertical motors is critical and must be understood and maintained correctly.

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.