Constantin Ghita

On the model of a Hybrid Step Motor

The paper presents numerical simulation results and experimental data used for modeling a hybrid step motor (HSM). Two different HSM models have been developed starting from available technical data of a HSM (2-phase, bipolar, frame size 56.4 mm). One of the models is adequate for analyzing the HSM response to different control strategies, while the second one can be used for performing an electromagnetic field analysis.

Considerations on modelling and simulation of stator winding distribution of a permanent magnet synchronous motor for driving a bicycle

In this paper, the authors present a comparative analysis by computation and modelling with the dedicated software ANSYS Maxwell 2D of winding distribution on slots and phases for a permanent magnet synchronous motor used for driving a bicycle. In order to facilitate and automate the computation of the stator winding elements (of the armature) was also developed a program of their own conception according to presented algorithm, developed in Visual Basic programming environment.

Influence of design parameters on a line start permanent magnet machine characteristics

This paper presents the design of a Line Start Permanent Magnets Synchronous Machine (LSPMSM) and the analysis of its starting capability. A preliminary sizing of the machine is carried out using an analytical procedure and the obtained solution is finally refined and completed by 2D Finite Element (FE) analysis. The effect of modifying the geometrical configuration of PMs, rotor bars and flux barriers on the LSPMSM starting capability is analyzed using the FLUX software package. This study is proved to be useful for the optimal design of the machine with the purpose of improving its start-up capability, one of the most sensible points of LSPMSM.

Cogging torque optimization of a four-pole PM machine

This paper presents a finite element based optimization study of a four-pole permanent magnets machine. The purpose of the analysis is to find a constructive solution characterized by a cogging torque less than 1% of the rated torque of the reference machine and reduced e.m.f. harmonics. The elements that are modified during the optimization process are the cross-section geometrical parameters of the permanent magnets and of the rotor core by keeping unchanged the magnets volume and stator geometry. Several constructive measures were studied, the best one being deeper analyzed. The numerical analysis is based on 2D magneto-static and transient magnetic type finite element models of the machine. Some of the numerical results are validated by experimental measurements.

Thermal study of induction machine using Motor-CAD

The paper presents thermal studies of three-phase induction motor during steady-state and transient regimes using Motor-CAD environment. The graphical interfaces for data input (motor geometry, materials properties) are also shown. The supposed duty cycles are S1, S2, and S3 (continuous, short-time and intermittent periodic duty respectively). As output data the temperatures for various motor parts (housing, stator windings, squirrel-cage rotor windings) are obtained.

PLC controlled elevator drive system

This paper presents a control method for an advanced electrical drive system for transportation, namely an elevator. For cost efficiency the control is performed with the simplest appropriate PLC. Thus, the software code was wisely developed to be fast and small size. Starting from an educational platform, which models a two floor elevator using a DC electrical drive, different sensors types and a PLC, the development of the actual driving sequences and PLC program, written using ladder diagram language, is detailed. In order to account for various normal operation and malfunctioning scenarios, some testing techniques are presented as well as their implemented into the PLCs program. Thereby, the paper has also an instructive aspect for engineers working in the automation field.

Considerations on the command and analysis of the low speed permanent magnet synchronous machines operating

In this paper the authors present an analysis of the command with rectangular (trapezoidal) printed currents of a permanent magnet synchronous motor (PMSM) for driving a bicycle. Constructive details and materials are presented. It also presents the results obtained from numerical simulations of the studied permanent magnet synchronous machine for its operating as a generator. In this operating regime, the magnetic field through machine was determined using 2D finite element method, and were represented the magnetic flux lines in a cross section of the machine and the magnetic induction map. Then the variation curves of the cogging torque of the machine, the phase voltages and the phase currents have been computed. On the studied machine were performed a series of measurements and experimental data acquisition which were then processed in order to validate some characteristics and computing parameters of the permanent magnet synchronous machine operating as a generator.

Some aspects of the cogging torque study of a permanent magnet synchronous motor to drive a bicycle

In this paper the authors present an analysis of the influence of different geometrical dimensions of the cross section of a permanent magnet synchronous motor to drive a bicycle on the size of its cogging torque. Thus are modified the stator slots isthmus width, the stator slots isthmus height, the stator teeth width (keeping slot pitch) and the width of the permanent magnet rotor (keeping the same mass of magnets and magnetic rotor yoke width). In order to achieve these objectives, is computed for each case, the inducer magnetic flux density of the motor by the 2D finite element method and the values of cogging torque in each of the considered cases.

Particular aspects of the cogging torque reduction for permanent magnet synchronous motors using specialized software

In this paper, the authors present the application of few important methods of the cogging torque reduction for a low speed permanent magnet synchronous motor used to drive a bicycle. The numerical modelling of the motor was made by using professional software based on the finite element method.

Numerical modeling of the electric linear generators based on the sea waves energy

The paper presents the design, the calculus and a numerical simulation of the magnetic field, the electromotive force and the electromagnetic forces for a direct driven permanent magnet linear generator buoy, used to generate electric energy based on the sea wavepsilas energy. The magnetic field is computed using finite element method applied on a 3D model of the generator.