TECO Westinghouse Motor Company

Rosita North, TX, United States

TECO Westinghouse Motor Company

Rosita North, TX, United States
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Alewine K.,Shermco Industries | Chen W.,TECO Westinghouse Motor Company
2011 Electrical Insulation Conference, EIC 2011 | Year: 2011

A quantitative review of the failure modes of over 1200 wind turbine generators repaired or replaced since 2005 has uncovered that fewer that half of the failures were electrical in nature and most of those were due to mechanical failures of the insulation support structure. In this paper, we will discuss briefly the overall failures and, in more depth, the nature of the electrical failures. Many of the failures appear to be of a serial nature due to inadequate original design of the machine and/or the insulation system. Some possible suggestions will be offered regarding repairs after catastrophic failure to help insure that the same type of failure will be less likely to repeat during the projected life of the turbine. These generators are exposed, at least in some part, to the typical voltage irregularities and mechanical stresses of any machine that operates 100 meters in the atmosphere in a wide variety of weathers. However, they are also sometimes affected by poor power quality from the IGBT based convertors used in most turbines. These failures could result from voltage stresses created by the convertor in the turbine or from neighboring turbines or, as has been suggested, even from neighboring wind parks. Defining actual root causes is therefore very difficult, but the immediate causes within the generator will be reviewed. Statistical information from other industries will also be used as a comparison to the relatively short experience of wind energy equipment. Where proper maintenance and mechanical analytical predictive techniques can drive major improvements in the mechanical life of the generators, the electrical failures are more difficult to identify before failure. © 2011 IEEE.


Abolhassani M.,TECO Westinghouse Motor Company
IEEE Transactions on Power Electronics | Year: 2012

A new approach to improve the power quality of high-power medium voltage multilevel drives is presented. A modular transformers strategy in conjunction with modular power electronics cubes is developed. By applying this technology, the input current harmonics decreases to well below the requirement of IEEE 519-1992 while the amount of capacitance installed in the drive is significantly reduced. In addition, by employing modular transformers technology and efficient cooling, power density of the drive is increased by 15%. The input power factor of drive is also improved. This paper details the new approach, analyses, and test results. © 2011 IEEE.


Kulkarni D.P.,TECO Westinghouse Motor Company | Rupertus G.,TECO Westinghouse Motor Company | Chen E.,TECO Westinghouse Motor Company
IEEE Transactions on Energy Conversion | Year: 2012

The key to the successful implementation of water jacket frame cooling in high-power electric machines, such as permanent magnet, doubly fed induction, and synchronous generators, is the contact between the laminated stator core and the frame. For improved thermal design, it is important to quantify the contact thermal resistance between lamination and frame. This paper quantitatively presents the values of conventional stator lamination and frame interface resistance through experimental results. So far, no experimental investigation has been carried out to determine this resistance. The effects of several parameters, such as surface finish, shrink fit pressures, use of thermal grease, and phase change thermal interface material on thermal contact resistance, have been experimentally investigated. The obtained values of thermal contact resistance between laminations and frame can be applied for future thermal designs of electric machines to predict accurate thermal performance. © 2011 IEEE.


Chen W.,TECO Westinghouse Motor Company
Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials | Year: 2015

High potential (Hipot) tests have long been used by many on machine stator windings to assess the integrity of electrical insulation system in question. Most industrial standards limit those recommended test values on completed new machines ready for service or existing machines under service/maintenance conditions. There is only limited information available in the literature regarding tests done on globally VPI'ed windings at pre-VPI green coil and/or green winding stages, and its impact on insulation life. We are aware that a limited few users do specify green coil test requirements, with some of those criteria significantly different than our in-house test standard that has been used for many years with proven effectiveness. This study is to compare these two different test philosophies, to see the advantages and disadvantages between them, and to check whether those different test approaches would affect the ultimate goal: the long term insulation reliability of machines in service. © 2015 IEEE.


Heron C.,TECO Westinghouse Motor Company
IEEE Industry Applications Magazine | Year: 2015

Like some of us, the paper industry has been around a long time. Unfortunately, so has a lot of the installed equipment. There have been some upgrades and improvements to machine design over the years, particularly in the areas of insulation and condition monitoring. However, the installed base has not necessarily kept the pace, due in part to the reliability built into older machinery. Today's facilities are under deeper scrutiny as system efficiency, machine reliability, and equipment condition-monitoring improvements are becoming the norm as the industry tries to position itself for the next century. © 2015 IEEE.


Patent
TECO Westinghouse Motor Company | Date: 2015-12-21

In one embodiment, a power cell chamber for a drive system includes moveable and fixed portions. The moveable portion includes a rectifier stage to rectify an input signal received from a secondary winding of a transformer to provide a rectified signal and an inverter stage having a plurality of switching devices to receive a DC signal and output an AC signal. This moveable portion can be slidably adapted within a cabinet of the drive system. In turn, the fixed portion includes a DC link having at least one capacitor to receive the rectified signal and provide the DC signal to the inverter stage.


Patent
TECO Westinghouse Motor Company | Date: 2013-03-08

Cooling assemblies and methods, including, for example, at least one bar (e.g., electrically insulated and/or thermally conductive bar(s)), members (e.g., i-beams, rectangular members, and the like), stator laminations, rotor laminations, and/or combinations thereof, such as those configured to cool electric machines (e.g., electric motors and generators).


Patent
TECO Westinghouse Motor Company | Date: 2013-03-08

Cooling assemblies (e.g., tubes, members (e.g., i-beams, rectangular members, and the like), stator windings, stator laminations, and/or combinations thereof), such as those configured to cool electric machines (e.g., electric motors and generators).


Patent
TECO Westinghouse Motor Company | Date: 2013-03-08

Cooling apparatuses and methods comprising cooling apparatuses, such as those configured to be coupled to and/or cool electric machines (e.g., motors, generators, and the like).


Patent
TECO Westinghouse Motor Company | Date: 2013-03-15

Cooling assemblies, such as those configured to cool electric machines (e.g., electric motors and generators) and components of electric machines (e.g., rotors and stators).

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