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Unbalanced Magnetic Pull in Three-phase Electric Motors

  • November 2021
  • Number of views: 971
  • Article rating: 3.0
Article

Although unbalanced magnetic pull can affect other rotating electric machines such as DC motors and generators and single-phase motors and generators, our focus in this article will be on three-phase squirrel cage induction motors. The two main topics are unbalanced magnetic pull (UMP) and rotor pullover.

Tracción Magnética Desbalanceada en Motores Eléctricos Trifásicos

  • November 2021
  • Number of views: 665
  • Article rating: No rating
Article

Aunque la tracción magnética desbalanceada puede afectar a otras máquinas eléctricas rotativas, como los motores y generadores de CC y monofásicos, nuestro enfoque en este artículo se centrará en los motores jaula de ardilla trifásicos. Los dos temas principales son: La tracción magnética desequilibrada (UMP) y el descentrado del rotor (pullover).

Electric Motors: Repair or Replace? Sales/Marketing PowerPoint Tool

  • August 2021
  • Number of views: 4731
  • Article rating: 5.0
PowerPoint files

This PowerPoint presentation is available for members to use to present the factors that should be considered when customers are faced with making the difficult decision to repair their existing motor or purchase a replacement.

Sizing Pumps & Pump Motors

  • July 2021
  • Number of views: 2108
  • Article rating: No rating
Article

Service centers are often called on to provide replacement pumps or pump motors or to advise on pump retrofit and re-application projects. A good understanding of the parameters that govern pump performance is essential to help customers with these opportunities. The information here relates to rotodynamic pumps (centrifugal and axial flow impellers) and not to positive displacement pumps.

Cambios en el Bobinado: Como Afectan el Desempeño del Motor

  • June 2021
  • Number of views: 3606
  • Article rating: No rating
FREE for Members of EASA
Webinar recording

En este webinario explicaremos como los diferentes cambios efectuados en el bobinado impactan en el desempeño del motor. Si no es realizado de forma correcta, cualquier cambio en el bobinado podría llegar a tener consecuencias negativas.

Considerations for Inrush vs. Locked Rotor Amps

  • June 2021
  • Number of views: 5829
  • Article rating: No rating
Article

When an AC motor is initially energized at rated voltage (and frequency), the current drawn is many times rated current until the motor attains full operating speed. Consequences of starting current include short time overheating of stator windings and rotors, undesirable operation of overload protective devices and a sag in the supply voltage.

Consideraciones para los Amperios Inrush vs Rotor Bloqueado

  • June 2021
  • Number of views: 4602
  • Article rating: 1.7
Article

Cuando se energiza inicialmente un motor de CA a su voltaje nominal (y frecuencia), el motor toma varias veces la corriente nominal hasta que alcanza toda la velocidad de operación. Las consecuencias de la corriente de arranque incluyen: Breve sobrecalentamiento de los bobinados del estator y del rotor, disparos no deseados de los dispositivos de protección y caídas de voltaje en el suministro eléctrico.

EASA Technical Manual

  • May 2021
  • Number of views: 10168
  • Article rating: 3.3
FREE for Members of EASA
Book

Revised May 2021!
EASA's most comprehensive technical document is available FREE to EASA members. Download the complete manual or just the sections you're interested in.

Good Practice Guide to Maintain Motor Efficiency

Based on the 2019 and 2003 Rewind Studies of premium efficiency, energy efficient, and IE2 (formerly EF1) motors

  • January 2021
  • Number of views: 6555
  • Article rating: 5.0
Booklet

Intended primarily for service center personnel, 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. It contains repair tips, relevant motor terminology, and information about sources of losses in induction motors that affect efficiency.

Fact or Myth: Common Misconceptions About Motors

  • January 2021
  • Number of views: 3160
  • Article rating: 3.7
Article

Here is a random collection of some relatively common misconceptions about three-phase squirrel cage motor performance characteristics.

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

LEARN MORE AND DOWNLOAD MÁS INFORMACIÓN Y DESCARGAR BUY PRINTED COPIES

READ MORE ABOUT THE FEATURES AND BENEFITS

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.

DOWNLOAD THE FULL RESULTS

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.

DOWNLOAD - ENGLISH

DESCARGAR - ESPAÑOL

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.

VIEW & DOWNLOAD