Electrical Machine modeling and simulation

For driving constant loads in industry, the use of direct-on-line-start permanent-magnet-assisted synchronous reluctance motors with ferrite magnets (DOL-Start-PMa-SynRM) is proposed. The bibliographic search demonstrated that this new motor has greater efficiency than one similar induction motor (IM). It was evidenced that the main element that is required for direct starting is to insert a squirrel cage into the rotor of a PMa-SynRM, which does not produce negative operational effects in a steady state. An economic evaluation was carried out in a sugar mill company, applying the differential net present value (NPV) method, and a sensitivity analysis, considering the four factors that present the most variation. It was demonstrated, by means of a Pareto diagram standardized for the NPV that the most significant factors are fuel factor, lifespan and the multiplication of both. With response surfaces that are obtained with a multilevel factorial experiment, it was determined that, by...

This paper concerns the thermal investigation of a surface-mounted permanent-magnet synchronous motor designed for high-temperature aerospace actuation applications. A finite-element package was developed, enabling accurate 3-D transient thermal analysis by considering complex and unsymmetrical actuator housing configurations. Its validity was verified by measurements carried out at different duty cycles and operating conditions.

This paper develops a model based on an original lumped-parameter network configuration for the thermal transient analysis of a permanent magnet synchronous motor (PMSM). The specific PMSM was designed and optimized for a demanding aerospace application. The validity of the proposed lumped-parameter model is verified by measurements carried out in a thermal chamber.

For driving constant loads in industry, the use of direct-on-line-start permanent-magnet-assisted synchronous reluctance motors with ferrite magnets (DOL-Start-PMa-SynRM) is proposed. The bibliographic search demonstrated that this new motor has greater efficiency than one similar induction motor (IM). It was evidenced that the main element that is required for direct starting is to insert a squirrel cage into the rotor of a PMa-SynRM, which does not produce negative operational effects in a steady state. An economic evaluation was carried out in a sugar mill company, applying the differential net present value (NPV) method, and a sensitivity analysis, considering the four factors that present the most variation. It was demonstrated, by means of a Pareto diagram standardized for the NPV that the most significant factors are fuel factor, lifespan and the multiplication of both. With response surfaces that are obtained with a multilevel factorial experiment, it was determined that, by...

This paper investigates the effects of rotor skew on the performance of permanent magnet synchronous generators. The main effects are concerning reduction of the electromotive force induced, stator current harmonics and torque ripple. The analysis performed is based on various 2D and 3D finite element techniques. Simulation results are compared to measurements.

The paper develops a special air-gap element based on the analytical solution of Laplace equation combined with standard finite elements, for analysis of electrical machines with rotor skew. It has been implemented for the analysis of a surface permanent magnet machine. The results obtained have been compared to the ones of a standard 3-D finite-element model and are in good agreement with the measured ones.

International Journal of Computer Science and Technology (IJCST) is devoted to fields of Computer Science and Technology. The IJCST is a open access peer-reviewed scientific journal published in electronic form as well as print form. The mission of this journal is to publish original contributions in its field in order to propagate knowledge amongst its readers and to be a reference publication.

The purpose of the present paper is the development of numerical techniques for the reduction of the computational cost of the 3D finite element (FE) transient analysis. The specific methodologies were applied for the electromagnetic and thermal transient analysis of a permanent magnet synchronous motor (PMSM) and an induction motor (IM) specifically designed and optimized for aerospace actuation applications.

For driving constant loads in industry, the use of direct-on-line-start permanent-magnet-assisted synchronous reluctance motors with ferrite magnets (DOL-Start-PMa-SynRM) is proposed. The bibliographic search demonstrated that this new motor has greater efficiency than one similar induction motor (IM). It was evidenced that the main element that is required for direct starting is to insert a squirrel cage into the rotor of a PMa-SynRM, which does not produce negative operational effects in a steady state. An economic evaluation was carried out in a sugar mill company, applying the differential net present value (NPV) method, and a sensitivity analysis, considering the four factors that present the most variation. It was demonstrated, by means of a Pareto diagram standardized for the NPV that the most significant factors are fuel factor, lifespan and the multiplication of both. With response surfaces that are obtained with a multilevel factorial experiment, it was determined that, by...

Three-phase induction machine mathematical model in canonical form.
An innovative 3 phase induction machine math. model. A more detailed paper (only in greek) was published on www.ti-soft (30/5/2000). It was titled  “Μαθηματικό μοντέλο και προσομοίωση 3φασικής επαγωγικής μηχανής” and can be found in “papers” folder.

We investigated effects of the two stimulus parameters, the stimulation intensity represented by the pulse amplitude and the pulse frequency, on the tactile sensations elicited by single-channel transcutaneous electrical stimulation. Two types of experiments were conducted. In the current experiment, the current was modulated with the frequency fixed at 20 Hz and 200 Hz. In the frequency experiment, the stimulation frequency was modulated with the amplitude fixed at 2, 4, 6, 8 and 10 mA, respectively. In the current experiment, tickling, pressure and the low-frequency vibration were elicited at 20 Hz in more than 90% of the subjects, but the high-frequency vibration mostly appeared at 200 Hz. The frequency experiment showed that the perceived vibration frequency increased with the stimulation frequency. However, the frequency at which the vibration appeared was consistent regardless of the stimulation intensity, implying that the stimulation intensity did not affect the perception frequency of the vibration. On the other hand, pressure was perceived stronger as either the stimulation intensity or the frequency increased. Our observations suggested that the perception frequency and the intensity of the vibration sensations were directly related to the stimulation frequency and the pulse amplitude, i.e. the stimulation intensity, respectively, and the perception intensity of pressure was affected by both the stimulation frequency and the pulse amplitude.

For driving constant loads in industry, the use of direct-on-line-start permanent-magnet-assisted synchronous reluctance motors with ferrite magnets (DOL-Start-PMa-SynRM) is proposed. The bibliographic search demonstrated that this new motor has greater efficiency than one similar induction motor (IM). It was evidenced that the main element that is required for direct starting is to insert a squirrel cage into the rotor of a PMa-SynRM, which does not produce negative operational effects in a steady state. An economic evaluation was carried out in a sugar mill company, applying the differential net present value (NPV) method, and a sensitivity analysis, considering the four factors that present the most variation. It was demonstrated, by means of a Pareto diagram standardized for the NPV that the most significant factors are fuel factor, lifespan and the multiplication of both. With response surfaces that are obtained with a multilevel factorial experiment, it was determined that, by...