Temat: induction machine - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Moment elektromagnetyczny w maszynie indukcyjnej dwustronnie zasilanej
Electromagnetic torque generated by doubly fed induction machine
Autorzy:: Lerch, T.
Skwarczyński, J.
Tematy:: maszyna dwustronnie zasilana
moment elektromagnetyczny
maszyna indukcyjna pierścieniowa
doubly fed induction machine
electromagnetic torque
slip-ring induction machine; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/320402.pdf Link otwiera się w nowym oknie
Opis:: W pracy przedstawiono wyprowadzenie składowych momentu elektromagnetycznego generowanego w maszynie indukcyjnej, której stojan i wirnik zasilane są z niezależnych źródeł napięcia. Na podstawie wyprowadzonych zależności obliczono przebiegi poszczególnych składowych momentu zarówno przy pracy silnikowej, jak i generatorowej. Obliczenia zostały przeprowadzone dla maszyny o mocy 10 kW, dla prędkości podsynchronicznych i nadsynchronicznych.
The paper shows derivation of components of the electromagnetic torque generated by induction machine, the stator and rotor of witch are supplied by an independent voltage sources. The derived equations made it possible to calculate the characteristics of particular components of the torque during the work of the motor as well of the generator. The calculations have been made for the 10 kW machine, for the subsynchronous and supersynchronous speed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Model of the double-rotor induction motor in terms of electromagnetic differential
Autorzy:: Adamczyk, D.
Wilk, A.
Michna, M.
Tematy:: double rotor
electromagnetic differential
induction machine; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/140805.pdf Link otwiera się w nowym oknie
Opis:: The paper presents a concept, a construction, a circuit model and experimental results of the double-rotor induction motor. This type of a motor is to be implemented in the concept of the electromagnetic differential. At the same time it should fulfill the function of differential mechanism and the vehicle drive. One of the motor shafts is coupled to the direction changing mechanical transmission. The windings of the external rotor are powered by slip rings and brushes. The inner rotor has the squirrel-cage windings. The circuit model parameters were calculated based on the 7.5 kW real single-rotor induction motor (2p = 4). Experimental verification of the model was based on comparison between the mentioned single-rotor motor and double-rotor model with the outer rotor blocked. The presented results showed relatively good compliance between the model and real motor.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Induction machine pulsating torque analysis
Autorzy:: Skalka, M.
Janda, M.
Ondrušek, Č.
Tematy:: maszyna indukcyjna
maszyna elektryczna
induction machine
electric machine; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Powiązania:: https://bibliotekanauki.pl/articles/1372867.pdf Link otwiera się w nowym oknie
Opis:: This article contains a pulsating torque calculation of 3-phase induction machine with power 1.1 kW from electromagnetic field. Whole analysis is done by finite element method in ANSYS. The torque is calculated via a circular path integral of the Maxwell stress tensor. The Maxwell stress tensor provides a convenient way of computing forces acting on bodies by evaluating a surface integral.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Optimization of fan of induction motor in the Ansys Workbench
Autorzy:: Janda, M.
Makki, Z.
Deeb, R.
Tematy:: induction motor
electrical machines
Ansys Workbench
fan of induction machine; Pokaż więcej
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Powiązania:: https://bibliotekanauki.pl/articles/377573.pdf Link otwiera się w nowym oknie
Opis:: This paper deals with the optimization of cooling of electric machines using Ansys Workbench. In many areas of electrical machines are increasingly used optimization methods to achieve greater performance and improved efficiency of the individual parts of electrical machines. These methods are very often connecting to computer programs such as Ansys, in order to obtain the best results. The program Ansys Workbench is several optimization algorithms that can be connected to the analysis of any group of physical fields. This allows other programs without the need to achieve optimal results in the design of electrical machines. This article specifically addresses the application of these algorithms for the adaptation of design changes the fan induction motor. Optimization was used to size the fan blades to achieve the greatest possible pressure coolant. The main dimensions of this design are limited fan induction motor and therefore are not optimized. The article discussed the results of this optimization, and also summarizes the main advantages and disadvantages of using this procedure.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Magnetic Decoupling: Basis to Form New Electrical Machines
Autorzy:: Rao, Yalla Tirumala
Chakraborty, Chandan
Tematy:: brushless synchronous generator
induction machine
magnetic decoupling principle
synchronous machine; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/58970765.pdf Link otwiera się w nowym oknie
Opis:: Magnetic decoupling principle when applied to electrical machines states that if two windings are configured for different number of pole pairs, they would not interact with each other magnetically even though they share a common magnetic core. This principle forms the basis for developing special machines where two or more machines can be integrated with the same magnetic circuit. This paper deals with formulating the mathematical analysis that determines the validity of this principle during practical conditions (i.e. non-sinusoidal winding distribution, flux saturation, etc.). Extensive Finite Element Method (FEM) simulation results from the Ansys Maxwell-2D software platform closely obey the conclusions derived from the mathematical analysis. As an example, new brushless and magnetless synchronous machines (SMs) have been developed by using this principle. It is designed by embedding an induction machine (IM) with a SM. Experimental investigations conducted on the laboratory prototype support the mathematical analysis dealt with in this paper.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Comparison of selected properties of three- and five-phase induction motors
Autorzy:: Schreier, L.
Bendl, J.
Chomat, M.
Tematy:: silnik indukcyjny
maszyna indukcyjna
maszyna elektryczna
electric machine
induction motor
induction machine; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Powiązania:: https://bibliotekanauki.pl/articles/1372864.pdf Link otwiera się w nowym oknie
Opis:: The paper analyses the rise of higher space harmonics in three-phase and five-phase induction machines. The results of the analysis show that there is a group of harmonics which are associated with symmetrical components of phase currents. In five-phase machines, the spectrum of higher harmonics assigned to the component which generates the operating torque is shifted to higher orders. Due to this fact, the five-phase machines have several advantages compared with the three-phase machines. These advantages are apparent mainly in a steady-state operation at symmetrical feeding. The five-phase machines have, however, also improved properties in transient and fault states. This fact is shown at the example of operation of three-phase and five-phase machines after the two-phase short circuit at the terminals of two neighbouring phase stator windings. In this case, the five-phase machine can, for a short time, operate with a rated load, while a three-phase machine is not able to generate sufficient torque and the rotor speed rapidly decreases to the standstill.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Initial Rotor Position Detection of Induction Machines Using Feedforward Sensorless Saliency Separation
Autorzy:: Montero, Eduardo Rodriguez
Vogelsberger, Markus
Wolbank, Thomas
Tematy:: induction machine
harmonic compensation
rotor slotting saliency
sensorless control; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/1956005.pdf Link otwiera się w nowym oknie
Opis:: The use of induction machine spatial saliencies for sensorless vector control in the proximity of zero electrical frequency has been extensively researched over the last few decades. A robust technique to extract machine saliencies is called voltage step excitation, and it computes a saliency phasor out of phase current derivatives resulting from specific voltage steps generated by the inverter switching. Within the saliency phasor, all machine saliencies appear superposed. For some machine constructions, multiple saliencies are present, containing information about the spatial, magnetic and geometric state of the machine. Due to its direct relation with the rotor angle and its high accuracy, rotor slotting saliency is often chosen as the sensorless control signal. In order to exclusively access rotor slotting, saliency separation needs to be carried out, with the goal of eliminating all non-control saliencies from the saliency phasor. In this research, feedforward harmonic compensation based on look-up tables (LUTs) is chosen. The idea is to estimate each saliency in relation to amplitude and phase shift once, store such information in a torque-dependent LUT and use it for feedforward compensation. Yet, several saliencies are linked to the rotor position and, thus, the stored phase shift in the LUT is fixed to a defined rotor position at which the saliency estimation was performed. For the feedforward compensation to work during each sensorless start-up, an initial rotor slot detection must be carried out. This paper presents a technique to estimate initial rotor angle based only on the inherent characteristics of the induction machine multi-saliencies and an iterative feedforward compensation process that requires no extra resources and only a few PWM (Pulse Width Modulation) periods to achieve initial slot rotor angle. Experimental results measured at two different test benches prove the high accuracy of the method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Time-harmonic finite element model for brushless doubly-fed induction machine in natural operating mode
Autorzy:: Jagieła, Mariusz
Łukaniszyn, Marian
Tematy:: doubly-fed machine
finite elements
induction machine
mathematical modelling
steady state
synchronous machine; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59111717.pdf Link otwiera się w nowym oknie
Opis:: The natural mode of operation for the brushless doubly-fed induction machine is a particular instance of synchronism at a so-called natural rotor velocity when one stator winding is powered by an AC and the other by a DC voltage source. Consequently, in addition to the rotating magnetic field, there exists a magnetic field that is fixed to the stator frame of reference. Analysis in this specific mode is essential as the natural velocity arises from the choice of pole numbers, thereby determining machine efficiency. However, this presents a significant challenge when it comes to mathematical modeling using complex-valued steady-state models through either equivalent-circuit or finite element analysis. This paper presents a study on the extension of the recently-proposed steady-state complex-valued finite element model for the brushless doubly-fed induction machine to enable its application in the natural operating mode. A high correlation with the data obtained from a time-stepping model is obtained for the extended model when subjected to both low and high levels of saturation of the magnetic circuit. This extension makes the whole approach applicable in all operating conditions and modes of the brushless doubly-fed induction machine. Considering the nearly two orders of magnitude lower computational costs associated with analysis via the proposed model compared to time-stepping analysis, it is particularly useful in scenarios that involve extensive computations and require multiple cases to be considered such as design sensitivity analysis, topology optimization or a connection with machine learning techniques.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Genetic Algorithm Embedded into a Quality-Oriented Workflow of Methods for the Development of a Linear Drive used in Intralogistic Systems
Autorzy:: Wörner, L.
Kulig, S.
Willing, M.
Winzer, P.
Tematy:: DeCoDe
genetic algorithm
intralogistic systems
linear induction machine
system model; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/140602.pdf Link otwiera się w nowym oknie
Opis:: This paper presents the results of the DFG-project (Deutsche Forschungsgemeinschaft) Q-ELF (“Qualitätsorientierter Methodenworkflow für die Produktneuentwicklung eines Linearantriebs in der Fördertechnik”) carried out in cooperation of the TU Dortmund University (support code KU 1307/12-1) with the BUW Wuppertal (support code WI 1234-11/1). The project continues the former project SFB 696 (Sonderforschungsbereich) regarding the Demand Compliant Design (DeCoDe) and the corresponding system model that strengthens the knowledge management to create high-quality mechatronical systems. In contrast to the SFB, which comprised the reverse engineering of a belt conveyor, Q-ELF applied a workflow of methods for quality oriented development on a new product. The DeCoDe ensures a methodical development that connects different engineering domains. This connection is important because the most problems and malfunctions arise at the interface of different domains due to their different notations for example. This approach also enables a methodical comparison of different competing concepts to pick the best suited one. A genetic algorithm is presented to further decrease the design-space. The project was carried out to develop linear drives for intralogistic systems.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Sensorless backstepping control using a Luenberger observer for double-star induction motor
Autorzy:: Chaabane, Hadji
Eddine, Khodja Djalal
Salim, Chakroune
Tematy:: backstepping control
double star induction machine (DSIM) drive
Luenberger observer; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/141539.pdf Link otwiera się w nowym oknie
Opis:: In this paper, we propose sensorless backstepping control of a double-star induction machine (DSIM). First, the backstepping approach is designed to steer the flux and speed variables to their references and to compensate uncertainties. Lyapunov”s theory is used and it demonstrates that the dynamic tracking of trajectories tracking is asymptotically stable. Second, unfortunately, this law control called sophisticated is a major problem which leads to the necessity of using a mechanical sensor (speed, load torque). This imposes an additional cost and increases the complexity of the montage. In practice, this variable is unknown and its measurement is expensive. To restrain this problem we estimate speed and load torque by using a Luenberger observer (LO). Simulation results are provided to illustrate the performance of the proposed approach in high and low variable speeds and load torque disturbance.
Dostawca treści:: Biblioteka Nauki

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