Inspecciones visuales in-situ para motores y generadores

Control ABB del entre hierro

Nuevo servicio que proporciona control visual del núcleo del estator, del núcleo de rotor y el bobinado sin la necesidad de retirar el rotor.

El nuevo servicio de control visual in situ de ABB utiliza un rastreador robótico - Control ABB del entre hierro - para examinar el núcleo del estator, del rotor y del bobinado de grandes motores y generadores. Las inspecciones hacen posible la comprobación de fallos sin la necesidad de retirar el rotor.

El rastreador robótico se mueve en el espacio de aire entre el estator y el rotor, atravesando las laminaciones del núcleo del estator utilizando pistas modulares y magnéticas. Se puede utilizar en todos los motores y generadores con espacios de aire de 10 mm y más. A diferencia de los dispositivos convencionales de inspección, que se limitan a turbogeneradores / hidroeléctricos con grandes espacios de aire, el control de ABB se puede utilizar en todos los grandes motores síncronos y generadores con espacios de aire de 10 mm o más.

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ABB Air Gap Inspector in questions and answers

Why should the crawler be used for inspection?

  • Reduced inspection cost.
  • In-situ inspection technologies enable motor or generator testing and inspection with the rotor in place.
  • Early problem detection.
  • Less risk of collateral damage from disassembly/reassembly.
  • Inspection time reduced by more than 33% compared to inspection with the rotor removed.
  • More time between rotor pulls.
  • Periodic monitoring of known conditions.

What kind of motors or generators can the crawler inspect?

  • Due to the low profile of the ABB Air Gap Inspector, it can be used to inspect synchronous motors as well as synchronous generators, turbo generators and hydro generators.
  • The low height of the crawler allows it to operate in any motor or generator with an air gap of 10 mm or more.
  • The crawler is designed to move over the stator teeth by means of magnetic attraction. It can therefore be used both when the rotor is in place and when it is removed.
  • The crawler’s drive module moves on ferric material, however, and normally only the teeth are made from this. Therefore the tracks on the drive module have to be aligned with the stator teeth. Since the dimensions of the teeth and the ratio of the tooth width to the wedge width vary across different motors/generators, the tracks have to be adjustable to match the tooth configuration for the motor/generator being serviced.
  • The crawler is highly configurable so that it can be adjusted to fit in a wide variety of stator designs. This makes the crawler unique as it can be adjusted so that it always stays aligned with the stator teeth.
    1. Height constraint: air gap 10 mm or greater.
    2. Diameter constraint: any diameter. Links to adjust the crawler will be available for standard motor/generator sizes as part of the kit. For specific motors/generators, links can be developed when the inspection order is booked to ensure alignment with the stator teeth.
    3. Access for the crawler: end shields, gas baffles, upper shields at both sides of the motor/generator, upper and lower shields, sometimes rotor fan blades. The requirements depend on the design of the motor/generator in question – sometimes just the outer doors and coolers are sufficient, sometimes many more parts have to be disassembled.

 

 

How many people do you need to carry out the inspection?

  • Two persons are required to carry out an effective inspection. This will allow one person to operate the crawler and the other to observe the results in real time.

How much time does it take to carry out an inspection?

  • The inspection time is directly dependent on the type of motor/generator, and also on the number of stator slots.
  • Experience shows that an inspection takes around 8 hours for an industrial synchronous motor/generator with about 100 slots.

What does ABB Air Gap Inspector offer in comparison to traditional inspections?

  • Unlike conventional inspection devices, which are restricted to turbo/hydro generators with very large air gaps, ABB Air Gap Inspector can be used on all large synchronous motors and generators which have an air gap of 10 mm or more.
  • Due to its modular structure, the inspection crawler can be adapted for a variety of motor/generator sizes by adjustment of the ABB proprietary design spacers.
  • The crawler is equipped with five cameras - three in front, one at the rear and one on the bottom. The camera focal length is adjustable to suit different types of motors and generators. The angle of the front-mounted side-facing cameras is adjustable to provide the best possible view of objects such as the stator teeth, air ducts, etc. The high resolution video feed from the cameras passes through the tether to the display and is saved for future analysis.

Does the crawler have CE certification?

  •  Yes, the crawler has CE certification. 
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