Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 83 for “"Induction motors"”.
-
Induction Motors With Rotor Helical Motion
… analysis of the twin-armature rotary-linear induction motor, a type of motor with two degrees of mechanical freedom, is the subject of this dissertation. The stator consists of a rotary armature and linear armature placed aside one another. Both armatures have a common rotor which can be …
-
Induction motors with modulated terminal voltage
… to the frequency and voltage control of induction motors as variable speed drives. The availability of these methods raises questions regarding their effect on the performance of the motor and the generation of harmonic currents in the electrical supply. After the initial use of numerical …
-
The Direct Torque Control of Induction Motors
… speed control methods of three phase, cage rotor induction motors with particular emphasis being given to vector control and direct torque control techniques. Modern control strategies such as vector control and direct torque control are investigated as well as the conventional methods such as …
-
Condition Monitoring of VSD-fed Induction Motors
Induction motor drives are presently the most fully fledged technology amidst the various motor drives not utilising commutators [1]. They consist of an induction motor (IM) fed from a variable frequency AC inverter. They are mostly used in applications which need good dynamic and steady state …
-
Studies in thyratron control of induction motors
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Electrical Engineering, 1946.
-
Models for Calculating Residual Voltage of Induction Motors.
Induction motors are commonly used in driving auxiliary equipment in coal-fired power plants. An external source of power must be connected to the auxiliary system for starting a turbine-generator. After the generator speed is increased to synchronous speed and synchronized with the power system, …
-
Improvements in direct torque control of induction motors
Electrical motors have been increasingly employed for more than a century to convert electrical energy into mechanical energy. The wide variety of existing applications requires in many cases a very precise control of the electrical motor by means of a variable speed drive incorporating …
-
Comparative performance analysis of drives for induction motors
The asynchronous polyphase induction motor has been the motor of choice in industrial settings for about the past half century because power electronics can be used to control its output behavior. Before that, the dc motor was widely used because of its easy speed and torque controllability. The …
-
Energy efficiency analysis of converter-fed induction motors
… in estimating the efficiency of converter-fed motors is the accurate determination of additional harmonic losses due to the PWM voltages and currents. Although the recently introduced IEC 60034-2-3 Technical Specification has proposed a method of determining these losses through experimental …
-
Parameter estimation of induction motors using PWM inverters
Induction motor parameter identification algorithms utilizing the DSP controlled 3 phase PWM inverter constructed in [12] are discussed. A single stator voltage test is carried out with the machine's rotor standing still. The resulting transient is used to determine machine electrical parameters. …
-
An investigation into the thermal modelling of induction motors.
Electric motors are the ubiquitous workhorses of the industry, working a in wide range of conditions and applications. Modern motors, designed to exact ratings using new materials improved manufacturing techniques, are now much smaller but have higher loadings. They are being operated much nearer …
-
Transient current analysis for fault detection in large induction motors.
… monitoring systems for polyphase squirrel cage induction machines, which employ the motors supply current as the diagnostic parameter, require the motor under investigation to be operating under fully loaded, steady state conditions before any useful information may be obtained. The aim of the …
-
A design and optimization assistant for induction motors and generators
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
-
Load-based energy savings in three-phase squirrel cage induction motors
… to reduce the energy consumed by US industry. Motors use almost 50 percent of the electricity in the United States. If motor efficiency could be increased then energy consumption could be reduced. There have been efforts to increase motor efficiency over past decade which lead to development of …
-
Modelling of induction motors for system faults and transient stability studies
… was mainly concerned with the effects of large induction motors and their transient performance in power systems. Computer packages using the three phase co-ordinate frame of reference were developed to simulate the induction motor transient performance. A technique using matrix algebra was …
-
Finite element analysis and design optimisation of shaded pole induction motors
… area of performance analysis of the Shaded Pole Induction Motors (SPIMs),much research has been done with different equivalent circuit models, but the results are generally not satisfactory. The emergence of Finite Element (FE) methods provides an opportunity to take a fresh look at the design of …
-
The impact of variable speed drives on energy efficient induction motors
… can prove essential in energy conservation. Induction motors and motorised loads consume an estimated 60% of the total energy required in the South African industry. This figure stands at 40% worldwide. Energy Efficient induction motors have proven to be an effective solution in the quest to …
-
Condition monitoring of induction motors in the nuclear power station environment
The induction motor is a highly utilised electrical machine in industry, with the nuclear industry being no exception. A typical nuclear power station usually contains more than 1000 motors, where they are used in safety and non-safety application. The efficient and fault-free operation of this …
Page 1 of 5