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A special discounted collection of 12 webinar recordings focusing on AC motor windings.
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With a steady increase in random wound AC motor sizes and the obvious superiority of the form coil winding, one area where we can help improve customers' motor reliability is by redesigning those large random wound motors to accept form coils. Most repairers would agree that machines rated larger than 600 hp (450 kW) should be designed as form coil machines. Likewise, those rated over 2 kV will be much more reliable as form coil machines.
No one wants to rewind a motor using 60 #14 AWG (62- 1.6 mm) wires in hand. With an abundance of niche suppliers of stator laminations, the cost and practicality of converting a random wound motor to form coil are available to nearly all service centers. Replacement laminations can be punched, laser-cut or water-cut, and supplied with very reasonable delivery times.
Con el aumento continuo de los tamaños de los motores CA y la obvia superioridad de los devanados con bobinas preformadas (pletina o solera), un área en la que podemos ayudar a mejorar la confiabilidad de los motores de nuestros clientes es rediseñando estos motores grandes de alambre redondo para que acepten bobinas preformadas. La mayoría de los reparadores estarían de acuerdo en que las máquinas de alambre redondo por arriba de 600 hp (450 kW) deberían rediseñarse con bobinas preformadas. Así mismo, aquellas con tensiones nominales superiores a 2 kV serían más confiables con bobinas de pletina.
Nadie quiere rebobinar un motor con 60 #14 AWG (62- 1.6 mm). Con la abundancia de proveedores especializados en laminaciones de estatores, el costo y la practicidad para convertir motores de alambre redondo a pletina está al alcance de casi todos los centros de servicio. Las laminaciones para reemplazar el núcleo pueden ser troqueladas o cortadas con láser o agua y entregadas en tiempos muy razonables.
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.
Manufacturers almost always utilize machine-inserted concentric windings for random-wound, three-phase stators when their processes can facilitate it due to lower manufacturing costs. Many service centers can produce concentric windings too, but the most common practice is to utilize the two-layer lap winding. For form-wound stators, the two-layer lap winding is almost always used by manufacturers and service centers alike. The purpose of this article is to provide some tips for working with odd-turn (unequal-turn) windings, or two-layer windings where the total number of turns per slot is an odd number (e.g., 3,5,7,9…n). In such cases, the top and bottom coil sides must have a different number of turns.
Cuando sus procesos pueden facilitarlo y para rebajar costos de fabricación, los fabricantes casi siempre emplean en los estatores trifásicos de alambre redondo, bobinados concéntricos insertados con máquinas. Muchos centros de servicio también pueden rebobinar bobinados concéntricos, pero la práctica más común es la de utilizar bobinados excéntricos de doble capa. Para los estatores con bobinas pre-formadas, los fabricantes y los centros de servicio utilizan la mayoría de las veces, bobinados excéntricos de doble capa.
La finalidad de este artículo es proporcionar algunos consejos para trabajar con bobinados con espiras diferentes (impares) o con bobinados excéntricos de doble capa donde el número de espiras por ranura es un número impar (Ej. 3,5,7,9…n). En estos casos, los lados superior e inferior de la bobina deben tener un número de espiras diferente.
This EASA software is a valuable interactive training tool ideal for training your novice(s) ... and even experienced winders will learn from it. The CD teaches how to wind in a richly detailed, step-by-step approach which includes narrative, animations and video clips, with tests to assess student comprehension.
Cette formation en ligne a été développée par EASA et a été traduite en français avec la collaboration de EASA, Chapitre Québec et les Maritimes et d’Élexpertise. Cette formation a été réalisée avec l’aide financière de la Commission des partenaires du marché du travail. L’objectif principal est de permettre à l’apprenant d’inscrire les données sur une fiche technique en faisant référence aux notions de base d’un stator triphasé. Les activités d’apprentissage touchent les principales étapes du bobinage. L’apprenant apprend l’entretien et la réparation d’un stator triphasé selon les normes en vigueur. Remarque: Cette formation sera accessible en ligne pour une période de 6 mois. Prix membre: $199 US Prix membre non: $599 US CONTENU INTRODUCTION MODULE 1- Notions de base sur le stator triphasé Structure du stator triphasé Schémas de raccordement du bobinage de stator Utilisation des fiches techniques MODULE 2 - Entretien et réparation d'un stator triphasé Mesures de sécurité Décapage du bobinage d’un stator triphasé Démoulage du bobinage d’un stator triphasé Préparation du noyau d’un stator triphasé Fabrication des enroulements d’un stator triphasé Insertion des enroulements dans un stator triphasé Raccordement des enroulements et des conducteurs électriques Laçage et renforcement du bobinage d’un stator triphasé Inspection du bobinage avant finition Test du bobinage d’un stator triphasé Finition du bobinage de stator triphasé CONCLUSION DURÉE: 10 heures
When an electric motor is expected to be stored for an appreciable time before it is placed into service, certain steps should be taken to ensure that it will be suitable for operation when it is needed. The practical limitation we need to recognize is that much of what we do when putting a motor into long-term storage has to be undone when the same motor is moved into operation. This article addresses common recommendations for stored motors.
When rewinding a motor, the service center is restricted by the original design. Sometimes, we encounter a motor design we wish had never been developed. Many winders would agree that the random-wound, 2300-volt motor design falls into that category. From the manufacturer's perspective, a random-wound, 2300-volt motor represents a substantial reduction in manufacturing cost. The great challenge to the service center is in successfully rewinding this design while maintaining profit.
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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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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