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Considerations for Inrush vs. Locked Rotor Amps

  • June 2021
  • Number of views: 13667
  • Article rating: 1.0
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: 23699
  • Article rating: 3.6
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.

Working with motor locked-rotor test data

  • February 2016
  • Number of views: 7215
  • Article rating: 4.5
Article

Locked-rotor testing of three-phase squirrel cage induction motors is used for design validation and quality control; it also can be a valuable diagnostic tool. But, this testing isn’t a common task for most service centers. Two challenges service centers often face are dynamometer torque capacity and test panel electrical capacity. The work-around is usually reduced-voltage testing, which presents another challenge – how to extrapolate the test data to rated voltage with reasonable assurance of accuracy. If the extrapolation is too far off, we run the risk of either rejecting a good motor or accepting a bad one. 

Trabajando con los datos de la prueba a rotor bloqueado

  • February 2016
  • Number of views: 8372
  • Article rating: 4.3
Article

La prueba a rotor bloqueado de los motores trifásicos de jaula de ardilla se usa para validar un diseño y para el control de calidad; esta prueba también puede ser una herramienta de diagnóstico valiosa. Pero esta prueba no forma parte de las actividades rutinarias de la mayoría de los centros de servicios.

Dos retos que a menudo enfrentan los centros de servicio son: La capacidad de par del dinamómetro y la potencia del tablero de pruebas.

Generalmente, esto se soluciona haciendo las pruebas a voltaje reducido, lo que presenta otro reto- como extrapolar los datos de prueba al voltaje nominal, asegurando una precisión razonable. Si la extrapolación está muy desviada, corremos el riesgo de rechazar un motor bueno o aceptar uno malo.

El propósito de este artículo no es proporcionar procedimientos detallados para realizar las pruebas a rotor bloqueado, sino presentar un enfoque práctico para analizar los datos a voltaje reducido, empleando herramientas a las que la mayoría de los centros de servicio tienen acceso en sus instalaciones. Adicionalmente, mientras este artículo se centra en los datos de la prueba a rotor bloqueado, la metodología empleada seguramente puede ser utilizada en otras pruebas donde existan condiciones y relaciones similares.

Loaded question: How much do you know about motor load?

Careful evaluation of motor load requirements could yield long-term savings

  • January 2016
  • Number of views: 6924
  • Article rating: No rating
Trade press article — Plant Services

Right-sizing of three-phase induction motors for different applications – and striking a balance between reliability and efficiency – isn’t always easy, but it can be cost-effective.

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.

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