On the energy optimized control of standard and high-efficiency induction motors in CT and HVAC applications

1998 ◽  
Vol 34 (4) ◽  
pp. 822-831 ◽  
Author(s):  
F. Abrahamsen ◽  
F. Blaabjerg ◽  
J.K. Pedersen ◽  
P.Z. Grabowski ◽  
P. Thogersen
Keyword(s):  
High Efficiency ◽  
Induction Motors

scholarly journals On The Design of High Efficiency Linear Induction Motors for Linear Metro

2000 ◽  
Vol 120 (8-9) ◽  
pp. 1008-1014 ◽  
Author(s):  
Tsuyoshi Higuchi ◽  
Sakutaro Nonaka ◽  
Masahiro Ando
Keyword(s):  
High Efficiency ◽  
Induction Motors ◽  
Linear Induction ◽  
Linear Induction Motors

A 100 Motor Study: Investigating Pre-EPA Motors as a Subset of the Industrial Motor Population for Its Effects on the Economic of Motor Replacement, Preliminary Results

2005 ◽  
Author(s):  
Nicole M. Kaufman ◽  
Daniel Welch ◽  
Richard R. Johnson
Keyword(s):  
Energy Savings ◽  
High Efficiency ◽  
Induction Motors ◽  
Preliminary Investigation ◽  
Economic Benefits ◽  
Analysis Software ◽  
Preliminary Results ◽  
Hard Data ◽  
Motor Efficiency ◽  
The Difference

In the absence of hard data, the engineering world tends to be overly conservative in estimating benefits of change. The hypothesis herein discussed is that with hard data, the economics of motor repair/replace decisions could change significantly. If true, this could appreciably boost the efficiency of the industrial motor population by affecting the penetration of high-efficiency motors, such as NEMA Premiums. The energy savings from motor replacement depend on the difference between the efficiency of the new motor and the old motor. There has been a great deal of work investigating new motor efficiency and very little work investigating the actual running efficiency of older motors in the field. Motors that have operated for years experiencing failures and repairs may operate below their original nameplate or assumed efficiency. This study is a preliminary investigation of the efficiency of motors in industrial settings with the purpose of updating currently available motor analysis software tools to more accurately reflect the economic benefits of utilizing high-efficiency industrial induction motors.

Using ESP Permanent Magnet Motor Technology in High-Temperature Geothermal Applications

2021 ◽  
Author(s):  
Natalia Lykova ◽  
Danila Martiushev
Keyword(s):  
High Temperature ◽  
Permanent Magnet ◽  
High Speed ◽  
Power Plants ◽  
High Efficiency ◽  
Induction Motors ◽  
Renewable Energy Sources ◽  
Hot Water ◽  
Heat Conducting ◽  
Permanent Magnet Motor

Abstract Geothermal energy is one of the more efficient renewable energy sources. It uses heat from the Earth's interior to produce electricity in geothermal power plants. In binary cycle power plants, geothermal water can often be produced naturally from high-pressure wells. But when reservoir pressure drops, these power plants need to add artificial lift to continue to produce needed quantities of hot water. The geothermal industry is looking at electrical submersible pumping (ESP) systems as a way to improve geothermal fluid production. But ESPs were designed for the conditions in oil wells and are subject to severe complicating factors in geothermal conditions that significantly reduce runlife, such as temperatures up to 200°C (390°F), highly corrosive fluid, and salt deposition (scale). At the same time, production rates need to be higher than those typical of oil production. The most commonly used geothermal pumps are driven by a transmission shaft and drive on the surface, or they use a submersible asynchronous induction motor. Surface-driven pumps, commonly called line-shaft pumps, have significant depth limitations. Submersible asynchronous induction motors cannot provide a sufficient volume of fluid supply and tend to overheat in high-temperature conditions. To compensate for the heat, induction motors must operate underloaded. Even so, they are subject to frequent premature failures with operating times of between 30 and 100 days. To solve the problem of cost-effective exploitation of geothermal fields, Novomet used its expertise with permanent magnet motors and high-speed pumps to develop an electrical submersible pumping system that would offer more reliability and runlife in geothermal conditions. A 254-mm (10-in.) geothermal submersible pumping (GSP) system was designed, manufactured, and tested with a production output of up to 12,000 m3/d (75,477 bbl/d, 139 l/s, 2201 gpm,). It featured new generation, high-efficiency pump stages and a permanent magnet motor with a capacity of up to 1.5 MW. The GSP system design was field tested in Turkey. Improvements to early system designs include the use of a heat-conducting filler in the materials used to compound the permanent magnet motor, the adoption of various high-temperature-rated components (AFLAS rubber elements, RYTON motor terminals, and heat-resistant motor oil), and the development of metal-to-metal sealing in the motor lead extension. One of the early GSP systems installed in the field performed reliably for 470 days at a frequency of 90 Hz, significantly exceeding the target runtime. More than thirty units with a total flow rate of 190,000 m3/d (1,195,000 bbl/d, 2199 l/s, 34,856 gpm) are currently in operation in Turkey. The electrical consumption savings average 25% for each GSP system with a permanent magnet motor compared to systems using asynchronous induction motors. While designed for geothermal applications, GSPs can also be used in oil and gas operations.

Microstructures and Electrical Conductivity of Cu-Ca Alloys for High Efficiency Induction Motors

2004 ◽  
Vol 449-452 ◽  
pp. 685-688 ◽  
Author(s):  
Keun Yong Sohn ◽  
Dong Woo Suh ◽  
Sang Yong Lee
Keyword(s):  
Electrical Conductivity ◽  
Grain Size ◽  
Thermomechanical Treatment ◽  
High Purity ◽  
High Efficiency ◽  
Induction Motors ◽  
Processing Condition ◽  
Molten Copper ◽  
Subsequent Heating ◽  
Semi Solid

The microstructures and electrical conductivity of newly developed Cu-Ca alloys for semi-solid forming have been investigated. High purity calcium was added to molten copper up to 1.4% by weight and mold-cast into a rod. Thermomechanical treatment (TMT) has been carried out to evaluate the variation in electrical conductivity and microstructures of Cu-Ca alloys. The electrical conductivity of copper was reduced linearly with the concentration of calcium by , where k is a constant having the values ranging from 16.7 to 20, depending on the processing condition. The introduction of prestrain significantly reduced the grain size during subsequent heating by recrystallization, influencing the electrical conductivity of Cu-Ca alloys.

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