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This paper presents the numerical analysis of a vector controlled permanent magnet synchronous motor (PMSM) by using circuit-coupled two-dimensional finite element method. The goal of the research was to estimate the performance of a vector controlled PMSM. In order to analyze the machines under rotating magnetic fields, the voltage source, symmetric boundary and slide boundary are considered. And...
The 3D finite element technique has been used to calculate transient electromagnetic fields and forces due to negative sequence currents in large synchronous turbogenerator rotors. The paper is devoted to the finite element analysis of electromagnetic forces in the joints of nonmagnetic slot wedges along the rotor length. Force distributions in the time and frequency domains are obtained. The results...
This report provides modified design of an ultrasonic motor stator transducer, whose top can vibrate along the figure-of-eight locus. The design employs two Langevin type ultrasonic transducers. Operating frequency of one transducer is just doubled as that of the other. Therefore this type of ultrasonic motor has been referred as multimode ultrasonic motor in this research. The modified design employs...
A coupled field-circuit method by taking into account the saturation is proposed in this paper. The stator winding inter-turn short circuit and the rotor eccentricity hybrid fault of permanent magnet synchronous generators (PMSG) is analyzed. The harmonic currents were used in order to investigate this kind of fault in a 7.5 kVA PMSG suitable for low-power wind generation applications. Simulation...
Main parts of the unit bears great temperature variation when turbine starts up, shuts down or operates under shaving peaking, which generates alternating thermal stress in rotator. The turbine operation experience indicates that alternating thermal stress is the key fact influencing ability of turbine to adapt to load variation and span loss. To a considerable degree, low cycle thermal fatigue span...
The present paper studies the flux densities distribution in the main parts of the reversed structure of the Lundell machine. The paper studies two different structures of such machines at the same power and dimensions. By classical calculations and 3D finite element method magnetic field analysis, the flux densities distributions are determined in all the machines regions.
This paper presents the design optimization method to maximize the torque of submersible motors. In optimization, genetic algorithms have been used because of its superior features over some other evolutionary algorithms. The magnetic analysis of motor has been implemented with two-dimensional finite elements method. The optimization results obtained from genetic algorithms have been verified by finite...
The permanent magnet synchronous motors are widely used in various industrial applications due to many advantages such as high power density, high efficiency, low manufacturing cost and so on, but cogging torque and moment of inertia are the most important factors affecting the performance and control precision. In this paper, firstly, the cogging torque can be effectively reduced by taking the auxiliary...
The paper deals with AC motor optimization. Optimized machine is three phases 14kW Surface Mount Permanent Magnet (SMPM) machine intended to work with servo amplifier. The optimization is based on Self Organizing Migrating Algorithm — SOMA with strategy "All to One". Artificial intelligence algorithms are effective methods for searching global extremes of the objective functions. Target...
Sensorless rotor position detection techniques have been gradually developed and proposed, which means that recently available methods can improperly work in some specific conditions. A proper and reliable method is needed. Consequently, a new sensorless rotor position detection technique of permanent magnetic synchronous machines (PMSMs) is proposed in this paper. The proposed method is achieved...
This paper presents a comparison between results, for two methods of obtaining the values of “d-axis” synchronous reactance Xsd and “q-axis” synchronous reactance Xsq, of the permanent magnet synchronous motor with radial magnets (RPMSM). The paper provides a background describing the benefits of using the RPMSM machine and how the synchronous reactance parameters are valuable in determining stability...
The circuit parameters involving the stray load loss and harmonic torques of high speed induction motors driven by inverters are determined by both finite element analysis and experiments. In the analysis, the parameters are directly determined from the electromagnetic field distribution of the motors under load conditions. On the other hand, in the experiment, the parameters are determined from no-load,...
In this paper, the core losses that occur in a 4-kVA flux-modulating synchronous machine (FMSM) were investigated using 2D finite element analysis (FEA), and the results were supported by experiments. A method for reducing the rotor core loss was also presented. The FMSM is a new type of multipole synchronous machine in which the stator field MMF is modulated by the air-gap permeance to generate the...
This paper introduces the design and performance analysis of an interior permanent magnet generator (IPMG) for applications in low speed wind turbine systems. The developed design is based on optimizing the geometry of double-layered permanent magnets (PMs), which are buried in the rotor body of an IPMG. The geometry of the double-layered permanent magnets is optimized and simulated using the 2-D...
Electric motors is the backbone of many industrial process, however it consumes of large portion of energy. Increasing energy costs create incentives for movement toward higher efficiency systems. Large high speed induction motors which are operating on variable frequency drives with flexible rotordynamic designs are often required to have an accurate prediction of its modal characteristics (natural...
In this paper, a combined wye-delta connection is introduced and compared with a common wye-connection of a concentrated winding. Because the combined wye-delta connection has a higher fundamental winding factor, the output torque is higher for the same current density when a sinusoidal current is imposed. As the combined wye-delta connection has only a minor influence on the losses in the machine,...
This paper discusses about the effects of cogging torque due to the amount of stator slot present in a typical permanent magnet generator using finite element analysis. All parameters other than stator slot number are kept at a constant to extract the cogging torque waveform on each run of the simulation using the weighted stress tensor method. The design of the generator itself is also kept at a...
This paper presents the effects of dynamic air-gap eccentricity (DE) on the performances of a 6/4 Switched Reluctance Machine (SRM) through finite Element Analysis by means of Finite Element Method Magnetics (FEMM). The Time-Frequency Representation (TFR) is carried out to study the effect of DE on the output torque signal. Time-frequency representation is an appropriate tool for detecting the mechanical...
A new torque cancelling system (TCS) that stabilizes mechanical sway in quick-motion robots is discussed in this paper. It cancels the reaction moment generated by the motion of an object by considering the precise dynamics of the object and the body of the robot itself. The reaction moment can be obtained accurately using the parallel solution scheme of inverse dynamics, which handles the dynamics...
The paper presents a new method for simulation of the cogging torque in a PM machine. The method benefits the numerical functions for modeling the magnetic system of the electrical machine. To compute the cogging torque by the numerical functions, it is necessary to model the permanent magnets and permeance of the machine. In this paper, we introduce two improved numerical functions to model them...
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