Sökning: "induction machines"

Visar resultat 1 - 5 av 33 avhandlingar innehållade orden induction machines.

1. 1. Thermal Analysis and Management of High-Performance Electrical Machines

   Författare :Shafigh Nategh; Chandur Sadarangani; Aldo Boglietti; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Computational fluid dynamics; directly cooled electric machines; finite element analysis; heat transfer; hybrid electric vehicle; induction machines; lumped-parameter thermal model; permanent-magnet assisted synchronous reluctance machines.;

   Sammanfattning : This thesis deals with thermal management aspects of electric machinery used in high-performance  applications  with  particular  focus put  on electric machines designed for hybrid electric vehicle applications.In the first part of this thesis,  new thermal models of liquid (water and oil) cooled electric machines are proposed. LÄS MER

3. 2. Study of Induction Machines with Rotating Power Electronic Converter

   Författare :Yanmei Yao; Chandur Sadarangani; Zi-Qiang Zhu; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Brushless induction machine; efficiency improvement; optimum efficiency; rotating power electronic converter; unity power factor; variable power factor; wound rotor induction machine; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : This thesis investigates a novel induction machine topology that uses a rotating power electronic converter. Steady-state and dynamic performance of the topology is studied to understand its operational principle. Furthermore the potential of improving its efficiency and power factor is investigated. LÄS MER

4. 3. Analysis and Control Aspects of Brushless Induction Machines with Rotating Power Electronic Converters

   Författare :Naveed ur Rehman Malik; Chandur Sadarangani; Luca Peretti; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Doubly-fed induction generator; extended vector control; induction machine; internal model control; Lindmark concept; low voltage ride through; passive resistive network; rotating power electronic converter; rotating exciter; symmetrical faults; synchronous machine; unity power factor; unsymmetrical faults; vector control; wind turbines.; Järnvägsgruppen - Elsystem; Järnvägsgruppen - Elsystem;

   Sammanfattning : This thesis deals with the steady-state, dynamic and control aspects of new type of brushless configuration of a doubly-fed induction machine in which the slip rings and carbon brushes are replaced by rotating power electronics and a rotating exciter. The aim is to study the stability of this novel configuration of the generator under mechanical and grid disturbances for wind power applications. LÄS MER

5. 4. Measurements and Modelling of Low-frequency Disturbances in Induction Machines

   Författare :Torbjörn Thiringer; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Modelling; induction machine; measurements;

   Sammanfattning : in this thesis the low-frequency dynamic behavior of the induction machine is analyzed. disturbances in the shaft torque and supply voltage are investigated theoretically, The calculated response to shaft torque disturbances is verified with measurements on a 15 kW machine. LÄS MER

7. 5. Analysis and Reduction of Parasitic Effects in Induction Motors With Die-Cast Rotors

   Författare :Alexander Stening; Chandur Sadarangani; Nicola Bianchi; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Aluminium rotors; asynchronous torques; copper rotors; die-cast rotors; induction machines; inter-bar currents; modulated rotors; starting torque; stray losses; synchronous torques;

   Sammanfattning : This thesis presents a study of inter-bar current effects on induction motors with die-cast aluminium and die-cast copper rotors. The parasitic effects introduced by these currents are analyzed and possible solutions to these problems are presented. This is realized by developing analytical tools for the simulation of inter-bar current effects. LÄS MER