Sökning: "stator"

Visar resultat 1 - 5 av 93 avhandlingar innehållade ordet stator.

1. 1. Diagnostics of stator insulatin by dielectric response and variable frequency partial discharge measurements a study of varied low frequencies in stator insulation, with particular attention to end-winding stress-grading

   Detta är en avhandling från Stockholm : KTH

   Författare :Nathaniel Taylor; KTH.; [2006]
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TECHNOLOGY Electrical engineering; electronics and photonics Electrical engineering; TEKNIKVETENSKAP Elektroteknik; elektronik och fotonik Elektroteknik;

   Sammanfattning : Stator insulation is a critical to the reliability of electrical generators and motors. It is common industrial practice to use electrical measurement of partial discharges (PD) and some form of current-voltage measurement as part of the condition assessment of stator insulation at maintenance times. LÄS MER

3. 2. Permanent magnet motor drives with switched stator windings

   Detta är en avhandling från Institutionen för elkraftteknik

   Författare :Eckart Nipp; KTH.; [1999]
   Nyckelord :;

   Sammanfattning : Permanent magnet (PM) motors aretoday regarded as aninteresting solution for a wide range ofinverter-fedvariable-speed drives. The generally increasedinterest in these motors hasled to many investigations on theirfeasibility for vehicle propulsion. LÄS MER

4. 3. Stator fault detection and parameter estimation in induction machines

   Detta är en avhandling från Luleå : Luleå tekniska universitet

   Författare :Mikael Stocks; Luleå tekniska universitet.; [2002]
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Reglerteknik; Control Engineering;

   Sammanfattning : In this licentiate thesis the fascinating area of induction machines is considered. Three different problems are treated, each one of them being more or less unsolved although many researchers around the world have addressed them extensively. LÄS MER

5. 4. Improved performance characteristics of induction machines with non-skewed symmetrical rotor slots

   Detta är en avhandling från Stockholm : KTH

   Författare :Rathna Chitroju; KTH.; [2009]
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; skewing; cross current losses; radial magnetic forces; magnetic noise; asymmetrical rotor slots; eccentricity; stator vibration; two-dimensional fast fourier transform; finite element method; TECHNOLOGY Electrical engineering; electronics and photonics; TEKNIKVETENSKAP Elektroteknik; elektronik och fotonik;

   Sammanfattning : Induction machines convert more than 55% of electrical energy into various other forms in industrial and domestic environments. Improved performance, especially by reduction of losses in induction machines hence can significantly reduce consumption of electricity. LÄS MER

7. 5. Flow over rough surfaces, and conjugate heat transfer, in engineering applications

   Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

   Författare :Bercelay Niebles Atencio; [2018]
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Skin-Friction Drag; Naphthalene Sublimation Tecnhique; correlation; RANS; Rotating Disk; stator channel; CFD; convective heat transfer; Antifouling paint; electric generator; Impinging Jet; Ship Hull; Roughness Function;

   Sammanfattning : This thesis focuses on two important topics in the field of fluid mechanics and heat transfer that were treated separately. On the one hand, the flow over rough surfaces, which is not yet completely understood, despite of the fact that it has an important implication in many engineering applications, especially in the naval industry for ships and boats because the friction drag caused by fouling, antifouling coatings and roughness in general impacts the fuel consumption and toxic emissions to the atmosphere. LÄS MER