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Stator Rewinds: When Things Get Tight

  • March 2024
  • Number of views: 624
  • Article rating: 4.0
Webinar recording

When preparing to rewind random or form-wound status, sometimes there just doesn’t seem to be enough room in the stator slot for the desired conductor area and insulation quantities. This presentation looks at balancing stator copper losses against insulation reliability.

Avoiding Pitfalls in Three-phase Windings with Unequal (Odd) Grouping

  • February 2023
  • Number of views: 2624
  • Article rating: 5.0
Article

This article uses examples to illustrate some of the pitfalls and subtle aspects regarding windings with unequal coil grouping.

Evitando Errores en Devanados Trifásicos con Grupos Desiguales

  • February 2023
  • Number of views: 1720
  • Article rating: No rating
Article
Este artículo usa ejemplos para ilustrar algunas de las trampas y aspectos sutiles con respecto a los devanados con agrupamiento desigual de bobinas.

Consider Winding Balance with Redesigns and Rewinds

  • December 2022
  • Number of views: 5464
  • Article rating: No rating
Article

Most AC stator windings installed by EASA service centers are balanced, three-phase, two-layer, lap windings. But, what does it mean for such a winding to be balanced?

Concentric, Lap or Full Slot Lap: When Is a Shortcut Not a Shortcut?

  • March 2022
  • Number of views: 6493
  • Article rating: 5.0
Article

While manufacturers use concentric windings due to their ability to wind the coils directly into a core, many repairers convert them to lap windings to take advantage of the superior MMF (magneto-motive force) curve. Although the former Tech Note 12 (see page 2-187 of the EASA Technical Manual), and the AC Motor Verification and Redesign Program, Version 4 allow us to convert a concentric winding to a comparable lap winding, there are still some winders using “shortcuts” they have learned over the years.

Concentrico, Excéntrico o Excéntrico a Ranura Llena: ¿Cuándo Un Atajo No Lo Es?

  • March 2022
  • Number of views: 5018
  • Article rating: No rating
Article

Mientras los fabricantes usan devanados concéntricos por su capacidad para bobinarlos directamente dentro del núcleo, muchos reparadores los convierten en bobinados excéntricos para aprovechar su curva FMM (fuerza magnetomotriz) superior.

Controlling Stator Copper Losses in Formed Coil Rewinds

  • May 2020
  • Number of views: 10518
  • Article rating: No rating
FREE for Members of EASA
Webinar recording

This webinar recording looks at several aspects of winding design to prevent increased temperature rise and decreased efficiency.

Insulation Technology Improvements and the Repair Market

  • July 2019
  • Number of views: 4969
  • Article rating: No rating
Webinar recording

Most modern rotating electric machines operate on the same principles their predecessors have for 100+ years. However, improvements in materials technology over that time have allowed for increasingly greater power density in machine design.

Getting to know fractional-slot concentrated windings (FSCW)

  • March 2019
  • Number of views: 10322
  • Article rating: No rating
Article

Fractional-slot concentrated windings (FSCW) have been used for decades, primarily in small machines. But continued technological advancement in power electronics along with the need for more efficient and power-dense machines is increasing use of FSCW in a variety of machine types and sizes.

Magnetic Wedges

  • February 2019
  • Number of views: 13628
  • Article rating: 5.0
Webinar recording

An increasing number of manufacturers are using magnetic wedges in their form-wound machines. When a winder fails to replace magnetic wedges in kind, the winding temperature rise can increase by 20°C, and the magnetizing current can increase by 20% or more.

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 September 2022
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