EPE Association: EPE-PEMC 2000 - Topic 08e: Modelling and Simulation

EPE-PEMC 2000 - Topic 08e: Modelling and Simulation
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 08: Electrical Machines and Actuators > EPE-PEMC 2000 - Topic 08e: Modelling and Simulation

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   A Converter Fed Electrical Machine Modelling for Diagnostic
By Curea O., Dakyo B., Raharijaona J. [View]
[Download]

Abstract: This paper deals with application of special signal processing methods in the field of power electric systems such as converter fed permanent magnets synchronous motor. Firstly, the variable frequency behaviour requires period recognition for signal processing. Two relevant methods are discussed. Secondly, a Park model of the motor is implemented. For diagnostic purpose, neural network and polynomial modelling of delivered signals tied to Simulink simulation are investigated. Finally, a diagnostic possibility based on the symmetrical space phasor diagram is proposed.

   A Magnetic Equivalent Circuit Model of the Induction Machine for the Simulation of Magnetic Transients
By Wolbank T.M., Wohrnschimmel R. [View]
[Download]

Abstract: The simulation of transients in saturated electrical machines by means of an equivalent circuit model is already known and was published, for example, in [1]. Suggested methods to imply non-linear magnetic behaviour are usually an analytical approximation of the magnetisation curve or, as in most cases, sampled data of the B-H characteristic and an interpolation between those data-points. Both methods neglect the hysteresis effects of the material, what is admissible as long as magnetic transients are not of major interest. But they are essential for sensorless control schemes of electrical ac drives, which are based on spatial differences of the magnetic saturation level. One of these sensorless control methods is the so-called INFORM method (Indirect Flux detection by On-line Reactance Measurement) [2]. For this method the local differences of the leakage inductance along the circumference of the machine are used to estimate the flux position without mechanical sensor. Therefore, the change of the stator current space phasor due to stator voltage test phasors is evaluated. The paper gives an overview of an energetic model of the material, which is described in detail in the references [4], [5], and presents it's application to the machine model. Simulation as well as measurement results of the sensorless control signals are also given.

   Analytical Analysis of an Induction Machine Fed from a Component - Minimized PWM Voltage source Inverter
By Klíma J. [View]
[Download]

Abstract: This paper presents an analytical model and analysis of the time response of the motor currents and electromagnetic torque for a four -switch inverter driving a three-phase induction machine. As the phase voltages are in principle asymmetrical ,first the asymmetrical space vectors are expressed in the symmetrical form. Next the mathematical model uses mixed description in the p and z domains. The operation region of SV PWM control of a four-switch inverter is investigated theoretically in time domain, compared to SVPWM control of a conventional six-switch inverter.

   Finite Element Modelling of the Magnetic Field in Asynchronous Motors Taking Ferromagnetic Hysteresis into Account
By Saitz J., Arkkio A., Negrea M. [View]
[Download]

Abstract: This paper deals with the advanced computation of the magnetic field in induction motors. Unlike in a conventional way, the magnetic hysteresis of the iron core material is included in the computational algorithm, which consists of the vector Preisach hysteresis model integrated in a two-dimensional time-stepping finite element analysis. The nonlinear hysteretic system of algebraic equations is solved through the Fixed-Point iterative technique. The results of the magnetic field modeling and core loss computation for two induction motors are reported.

   High Frequency Modeling of Switched Reluctance Motor Drives
By Cacciato M., Consoli A., Scarcella G., Testa A.* [View]
[Download]

Abstract: The paper deals with a mathematical model of the Switched Reluctance Motor, useful to evaluate high frequency (150 kHz - 30 MHz) common mode and differential mode current components. The main problem in evaluating high frequency current components in a Switched Reluctance Motor drive relays in the fact that high frequency current paths change according to the topology of the converter. A suitable model structure is thus selected that can be used irrespectively of the converter topology. A parameter identification procedure is presented that allows to determine the parameters of the proposed model according to some experimental tests.

   Magnetic Field in Surroundings of Induction Motor
By Chmelík K., Vachala A. [View]
[Download]

Abstract: High reliability is one of the most important requirements of technical operations and can be assessed by estimation of the actual operational state. This operation is called technical diagnostics. Magnetic induction around an induction motor is taken as a value indicating the state of its functional properties. We practise modelling of magnetic field around the induction motor by means of the ANSYS program in order to get information about the shape of the magnetic field and about the size of magnetic induction both outside a faultless induction motor and a motor with an eccentric air gap. The results are then checked by measuring the outside magnetic field of the induction motor during its operation by means of the BELL apparatus.

   Modelling and Identification of a Synchronous Reluctance Machine with a Squirrel Cage
By Lubin T., Weinachter F., Razik H., Rezzoug A. [View]
[Download]

Abstract: This paper deals with the identification and the modelling of a low power (0.6 kW) synchronous reluctance machine. This machine has a salient-pole rotor with a squirrel cage. A mathematical model is based on the space phasor theory. The direct and quadrature parameters are measured with various methods and the results are compared. Therefore, a simulation of a rotor-oriented vector control is made by the use of a speed control based on fuzzy logic.

   Modelling of a Double-Star Induction Motor with an Arbitrary Shift Angle between its Three Phase Windings
By Hadiouche D., Razik H., Rezzoug A. [View]
[Download]

Abstract: In this paper, the analysis and the modelling of a Double-Star Induction Motor (DSIM) are presented. In particular, the effects of the shift angle between its three phase windings are studied. A complex steady state model is first established in order to analyse its harmonic behaviour when it is supplied by a non-sinusoidal voltage source. Then, a new transformation matrix is proposed to develop a suitable dynamic model. In both cases, the study is made using an arbitrary shift angle. Simulation results of its PWM control are also presented and compared to confirm the theoretical observations.

   Numerical Evaluation of Currents in Circuits with Ferromagnetic Cores on the Basis of Commutation Curve
By Wlodarski Z., Wlodarska J. [View]
[Download]

Abstract: The evaluation of currents in circuits with ferromagnetic cores leads to trouble-so-me graphical or numeri-cal procedures. In many cases the calculations may be simplified by the intro-duc-tion of an analytical approximation of commutation curve di-rectly into the induct-ance of a circuit. The influence of hysteresis loops can be taken into account by the introduction of an exponential correction for greater currents. The optimization of para-meters, numerical calculation of currents and graphical presen-tation of results may be done with the help of Mathcad program.

   Radial-Flux Double-Salient Machines Time Domain Simulation
By Viorel I.A., Tomescu I., Bíró K. A.A., Radu M. [View]
[Download]

Abstract: The double-salient (DS) machines combine the advantages of variable reluctance structure with the permanent magnet (PM) excitation, the switched reluctance machine (SRM), which belongs to the DS machines class, is the only one that has no PM excitation. Since the phase flux linkage of a DS machine varies with the rotor position and the phase current, the circuit-type mathematical model can not cover adequately the phenomenon. In the paper is presented a method, and the corresponding computer program, to calculate the transient and steady state characteristics of the DS machines. The computation is based on a simplified circuit-field mathematical model of the DS machines, which is not supported by finite element method (FEM) analysis. The program, which can be integrated in a sizing-dimensioning procedure, allows the driving system and DS machine supply source to be taken into consideration. The results obtained by computing the transient characteristics for two DS machines stand by to prove the program accuracy and versatility.

   Thermal Models of Turbogenerator Rotors for Different Cooling Systems Used in CAD
By Krok R., Miksiewicz R. [View]
[Download]

Abstract: The circuit models for thermal calculation of turbogenerator rotors with different ventilation systems have been presented in the paper. The worked out thermal electric networks for indirect and direct radial, axial-radial systems are shown. The calculation results of temperature distribution along the excitation winding for the mentioned above cooling system obtained by means of the worked out package of computer programs. The winding average temperatures have been compared with the measurement results. Possibilities of application this programs to CAD of different ventilation system have been shown.

EPE-PEMC 2000 - Topic 08e: Modelling and Simulation
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 08: Electrical Machines and Actuators > EPE-PEMC 2000 - Topic 08e: Modelling and Simulation
	[return to parent folder]

	A Converter Fed Electrical Machine Modelling for Diagnostic By Curea O., Dakyo B., Raharijaona J.	[View] [Download]
Abstract: This paper deals with application of special signal processing methods in the field of power electric systems such as converter fed permanent magnets synchronous motor. Firstly, the variable frequency behaviour requires period recognition for signal processing. Two relevant methods are discussed. Secondly, a Park model of the motor is implemented. For diagnostic purpose, neural network and polynomial modelling of delivered signals tied to Simulink simulation are investigated. Finally, a diagnostic possibility based on the symmetrical space phasor diagram is proposed.

	A Magnetic Equivalent Circuit Model of the Induction Machine for the Simulation of Magnetic Transients By Wolbank T.M., Wohrnschimmel R.	[View] [Download]
Abstract: The simulation of transients in saturated electrical machines by means of an equivalent circuit model is already known and was published, for example, in [1]. Suggested methods to imply non-linear magnetic behaviour are usually an analytical approximation of the magnetisation curve or, as in most cases, sampled data of the B-H characteristic and an interpolation between those data-points. Both methods neglect the hysteresis effects of the material, what is admissible as long as magnetic transients are not of major interest. But they are essential for sensorless control schemes of electrical ac drives, which are based on spatial differences of the magnetic saturation level. One of these sensorless control methods is the so-called INFORM method (Indirect Flux detection by On-line Reactance Measurement) [2]. For this method the local differences of the leakage inductance along the circumference of the machine are used to estimate the flux position without mechanical sensor. Therefore, the change of the stator current space phasor due to stator voltage test phasors is evaluated. The paper gives an overview of an energetic model of the material, which is described in detail in the references [4], [5], and presents it's application to the machine model. Simulation as well as measurement results of the sensorless control signals are also given.

	Analytical Analysis of an Induction Machine Fed from a Component - Minimized PWM Voltage source Inverter By Klíma J.	[View] [Download]
Abstract: This paper presents an analytical model and analysis of the time response of the motor currents and electromagnetic torque for a four -switch inverter driving a three-phase induction machine. As the phase voltages are in principle asymmetrical ,first the asymmetrical space vectors are expressed in the symmetrical form. Next the mathematical model uses mixed description in the p and z domains. The operation region of SV PWM control of a four-switch inverter is investigated theoretically in time domain, compared to SVPWM control of a conventional six-switch inverter.

	Finite Element Modelling of the Magnetic Field in Asynchronous Motors Taking Ferromagnetic Hysteresis into Account By Saitz J., Arkkio A., Negrea M.	[View] [Download]
Abstract: This paper deals with the advanced computation of the magnetic field in induction motors. Unlike in a conventional way, the magnetic hysteresis of the iron core material is included in the computational algorithm, which consists of the vector Preisach hysteresis model integrated in a two-dimensional time-stepping finite element analysis. The nonlinear hysteretic system of algebraic equations is solved through the Fixed-Point iterative technique. The results of the magnetic field modeling and core loss computation for two induction motors are reported.

	High Frequency Modeling of Switched Reluctance Motor Drives By Cacciato M., Consoli A., Scarcella G., Testa A.*	[View] [Download]
Abstract: The paper deals with a mathematical model of the Switched Reluctance Motor, useful to evaluate high frequency (150 kHz - 30 MHz) common mode and differential mode current components. The main problem in evaluating high frequency current components in a Switched Reluctance Motor drive relays in the fact that high frequency current paths change according to the topology of the converter. A suitable model structure is thus selected that can be used irrespectively of the converter topology. A parameter identification procedure is presented that allows to determine the parameters of the proposed model according to some experimental tests.

	Magnetic Field in Surroundings of Induction Motor By Chmelík K., Vachala A.	[View] [Download]
Abstract: High reliability is one of the most important requirements of technical operations and can be assessed by estimation of the actual operational state. This operation is called technical diagnostics. Magnetic induction around an induction motor is taken as a value indicating the state of its functional properties. We practise modelling of magnetic field around the induction motor by means of the ANSYS program in order to get information about the shape of the magnetic field and about the size of magnetic induction both outside a faultless induction motor and a motor with an eccentric air gap. The results are then checked by measuring the outside magnetic field of the induction motor during its operation by means of the BELL apparatus.

	Modelling and Identification of a Synchronous Reluctance Machine with a Squirrel Cage By Lubin T., Weinachter F., Razik H., Rezzoug A.	[View] [Download]
Abstract: This paper deals with the identification and the modelling of a low power (0.6 kW) synchronous reluctance machine. This machine has a salient-pole rotor with a squirrel cage. A mathematical model is based on the space phasor theory. The direct and quadrature parameters are measured with various methods and the results are compared. Therefore, a simulation of a rotor-oriented vector control is made by the use of a speed control based on fuzzy logic.

	Modelling of a Double-Star Induction Motor with an Arbitrary Shift Angle between its Three Phase Windings By Hadiouche D., Razik H., Rezzoug A.	[View] [Download]
Abstract: In this paper, the analysis and the modelling of a Double-Star Induction Motor (DSIM) are presented. In particular, the effects of the shift angle between its three phase windings are studied. A complex steady state model is first established in order to analyse its harmonic behaviour when it is supplied by a non-sinusoidal voltage source. Then, a new transformation matrix is proposed to develop a suitable dynamic model. In both cases, the study is made using an arbitrary shift angle. Simulation results of its PWM control are also presented and compared to confirm the theoretical observations.

	Numerical Evaluation of Currents in Circuits with Ferromagnetic Cores on the Basis of Commutation Curve By Wlodarski Z., Wlodarska J.	[View] [Download]
Abstract: The evaluation of currents in circuits with ferromagnetic cores leads to trouble-so-me graphical or numeri-cal procedures. In many cases the calculations may be simplified by the intro-duc-tion of an analytical approximation of commutation curve di-rectly into the induct-ance of a circuit. The influence of hysteresis loops can be taken into account by the introduction of an exponential correction for greater currents. The optimization of para-meters, numerical calculation of currents and graphical presen-tation of results may be done with the help of Mathcad program.

	Radial-Flux Double-Salient Machines Time Domain Simulation By Viorel I.A., Tomescu I., Bíró K. A.A., Radu M.	[View] [Download]
Abstract: The double-salient (DS) machines combine the advantages of variable reluctance structure with the permanent magnet (PM) excitation, the switched reluctance machine (SRM), which belongs to the DS machines class, is the only one that has no PM excitation. Since the phase flux linkage of a DS machine varies with the rotor position and the phase current, the circuit-type mathematical model can not cover adequately the phenomenon. In the paper is presented a method, and the corresponding computer program, to calculate the transient and steady state characteristics of the DS machines. The computation is based on a simplified circuit-field mathematical model of the DS machines, which is not supported by finite element method (FEM) analysis. The program, which can be integrated in a sizing-dimensioning procedure, allows the driving system and DS machine supply source to be taken into consideration. The results obtained by computing the transient characteristics for two DS machines stand by to prove the program accuracy and versatility.

	Thermal Models of Turbogenerator Rotors for Different Cooling Systems Used in CAD By Krok R., Miksiewicz R.	[View] [Download]
Abstract: The circuit models for thermal calculation of turbogenerator rotors with different ventilation systems have been presented in the paper. The worked out thermal electric networks for indirect and direct radial, axial-radial systems are shown. The calculation results of temperature distribution along the excitation winding for the mentioned above cooling system obtained by means of the worked out package of computer programs. The winding average temperatures have been compared with the measurement results. Possibilities of application this programs to CAD of different ventilation system have been shown.