Revised September 2022!
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High-potential testing is routinely used to assess the ground insulation of AC stator windings in-process, after completion of a rewind and post-delivery. This webinar covers types of high-potential tests, testing standards, evaluating test results, and more.

There are applications where the end float inherent to a sleeve bearing machine is not desirable, and some means of limiting the axial movement is needed. This is usually accomplished by selecting an appropriate coupling and relying on the driven equipment to prevent axial movement of the motor shaft. 

The gear-hub style of coupling can be end-float limited by installing a “hockey-puck” spacer. The grid-style coupling can be limited by spacers inserted on both sides. 

Regardless of coupling style, unless the driven equipment has some internal means to limit end float, there are circumstances where some external means of preventing axial movement is needed.

La precisión y exactitud de los equipos de prueba & medida (M&TE) han sido tratadas en artículos previos de Currents (noviembre y diciembre de 2014). Un tema relacionado que no fue cubierto en dichos artículos es la resolución. Este artículo cubrirá ese tema.

When a customer requests a motor be rewound for a new set of conditions, that is typically what we in the service center industry provide them. However, there are occasions where the customer request may be fulfilled by reconnection; in some cases, this is done simply by revising the motor nameplate data. The purpose of this article is to identify and explain some of these scenarios.

Cuando un cliente solicita que un motor sea rebobinado para una nueva serie de condiciones, esto es lo que nosotros habitualmente le proporcionamos en la industria de los centros de servicio. No obstante, existen ocasiones en las que lo requerido por el cliente se puede llevar a cabo por reconexión; en algunos casos, esto se hace simplemente revisando los datos de placa del motor. El propósito de este artículo es identificar y explicar algunos de estos escenarios.

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".

Rapid changes in technology can mean better ways of doing things. In the EASA spirit of cooperation, we're asking for proven tips from members. Do you have a shortcut or tip for doing a job better? Is there a new tool that works particularly well for some motor-shop task? Share your knowledge! To kick things off, here are a few "Quick Tips" using technology that has been around for as long as I can remember...