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This video explains how to check the ground insulation of an AC motor winding using the insulation resistance (IR) test.
One of the more mundane things we as repairers must be concerned with is motor storage. For many of us, storing large motors for major customers is its own profit center. For all of us, being aware of how our customers store the motors we repair and send to them is critical to customer satisfaction. A poorly stored motor is likely to suffer winding or bearing failure, and we don’t want unrealistic warranty claims over something outside our control.
Una de las cosas más mundanas de las que debemos preocuparnos como reparadores es el almacenamiento de los motores y para muchos, almacenar motores grandes para clientes importantes representa ganancias. Para todos nosotros, ser conscientes de cómo nuestros clientes almacenan los motores que les reparamos es crítico desde el punto de vista de la satisfacción del cliente. Es probable que un motor mal almacenado sufra fallos en el devanado o en los rodamientos, y no queremos reclamos por garantía poco realistas sobre algo que está fuera de nuestro control.
The open stator impedance test (a.k.a, ball test or dummy rotor test) is used by many service centers as a quality control check before winding treatment and/or a troubleshooting test. This webinar recording reviews test procedures, expected outcomes and incorporating thermal camera imaging.
When possible, it is good practice to perform an uncoupled, no-load run on an induction motor as an incoming diagnostic test. A no-load run should also be performed after assembly, and ANSI/EASA AR100-2020 states that “no-load running tests should be made at rated voltage and rated frequency.” In this article, we’ll discuss some of the reasons why this is important and some things to consider when you cannot meet both requirements.
Como forma de diagnóstico y cuando sea posible, una buena práctica consiste en probar en vacío un motor de inducción que entra al centro de servicios. Esta misma prueba también se debe efectuar después del ensamblaje y la norma ANSI/ EASA AR100-2020 establece que "las pruebas en vacío se deben realizar a la tensión y frecuencia nominales". En este artículo, discutiremos algunas de las razones por las que esto es importante y algunos factores a considerar cuando no se puede cumplir con ambos requisitos.
Induction motor stator cores can be manufactured using single-piece laminations, however, for larger stators, or when minimizing scrap material, the stator laminations are segmented. While most service center repairs of machines with segmented stator laminations require no special attention, this article reviews a few scenarios that are important to be mindful of.
Los núcleos de los motores de inducción se pueden fabricar con laminaciones de una sola pieza, sin embargo, para estatores muy grandes o cuando se minimiza el material de desecho, las laminaciones del estator son segmentadas. Aunque la mayoría de las reparaciones en el centro de servicio de las máquinas con estatores con laminaciones segmentadas no requieren atención especial, este artículo analiza algunos escenarios que es importante tener en cuenta.
High potential (hipot) testing procedures for motor and generator windings are usually performed with 50/60 Hz AC or DC as the power source. Hipot testing is a critical step in validating the quality of new windings. AC and DC hipot tests are also useful to understand the condition of aged insulation for machines in service. The disadvantage of the AC test at power frequency is when the size of the test set and/or complexity of the setup becomes problematic in motor repair and in the field. And the DC test stresses the end turns more. The very low frequency (VLF) test set has been successfully used to bridge the test gap between AC and DC hipot tests.
Los procedimientos de prueba de alto potencial (hipot) para devanados de motores y generadores generalmente se realizan con 50/60 Hz CA o CC como fuente de alimentación. La prueba de Hipot es un paso crítico para validar la calidad de los devanados nuevos. Las pruebas hipot de CA y CC también son útiles para comprender el estado del aislamiento envejecido de las máquinas en servicio. La desventaja de la prueba de CA a frecuencia industrial es cuando el tamaño del equipo de prueba y / o la complejidad de la configuración se vuelven problemáticos en la reparación del motor y en el campo. Y la prueba de CC enfatiza más los giros finales. El equipo de prueba de muy baja frecuencia (VLF) se ha utilizado con éxito para cerrar la brecha de prueba entre las pruebas hipot de CA y CC.
This 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:
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The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.
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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.
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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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