Search

The use of solid rotor and pole-plate synchronous machines has several advantages, among which is the fact that it provides a more robust rotor compared to laminated equivalents. This paper investigates the time and space harmonic losses in solid rotor synchronous machines. The work considers the use of copper coating on the pole-plates, studying the effect that this design modification has on the losses. A recommendation is given based on this study, which is considered to reduce the time harmonic losses without detrimental effects as far as the space harmonic losses are considered., QC 20150629

The use of VSD (variable speed drives) is becoming prominent in industry as it has the benefit of being more energy efficient than conventional process-control mechanisms (such as throttling). VSD usually rely on the use of inverters to produce the required frequency output, which contains time harmonics that eventually induce excess losses in the machine. These losses are the subject of analysis in this study. The results show that it is possible to influence the induced current magnitude (due to the space and time harmonics) through proper design modifications, as to reduce the consequent losses. The paper focuses specifically on DTC (direct torque control) VSD application on solid pole plate synchronous machines. One of the observed effects is that the time and space harmonics are distributed differently on the pole plates., QC 20120402

This paper presents a novel method in which eddy current losses in a solid rotor direct torque controlled synchronous machine are found by utilizing a combination of analytical and FEM (Finite Element Method) simulations. The method is presented along with the results obtained. The article also briefly presents a new method in which 3D (three dimensional) current flows can be modelled using a 2D (two dimensional) FEM model., QC 20110310

This paper presents the results obtained from testing of a Direct Torque Controlled (DTC) Field excited synchronous motor. The results obtained from testing will be compared to their equivalents obtained from simulation of the machine model using Finite Element Method (FEM) software., QC 20110222

This paper evaluates the effects of using zero voltage vectors in DTC (Direct Torque Control) applications. The evaluation considers a DTC-driven field wound synchronous motor, where the analysis is carried out using a combination of analytical and FEM (Finite Element Method) simulations. The simulations are assessed against a background of measurement results. The main emphasis of the analysis is placed on finding the losses in the motor, with a particular focus on those occurring in the solid rotor pole-plates. The paper will also utilise an innovative power difference method to estimate the time harmonic power losses in the machine., QC 20110304

This paper presents a study of eddy current rotor losses in solid pole synchronous machines, fed by a voltage source inverter. The main emphasis is on DTC (Direct Torque Control) application. The DTC operation loss analysis is carried out using FEM (Finite Element Method)-software. The article considers a novel modelling technique that can be used when simulating inverter-fed machines in 2D-FEM application. In addition this article includes a brief introduction into how DTC operates., QC 20110713