EPE Association: EPE-PEMC 2008 - Topic: Analysis and Design of Electrical Drives Using Field-Circuit Models

EPE-PEMC 2008 - Topic: Analysis and Design of Electrical Drives Using Field-Circuit Models
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2008 - Conference > EPE-PEMC 2008 - Topic: Analysis and Design of Electrical Drives Using Field-Circuit Models

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   An Efficient Field-Circuit Coupling Method by a Dynamic Lumped Parameter Reduction of the FE Model
By F. Henrotte, E. Lange and K. Hameyer [View]
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Abstract: A field-circuit coupling method is presented, whose basic idea is to extract from the FE model, on basis of energy balance considerations, a temporary lumped parameter representation of the electrical machines, to be used in the circuit simulator model of the power electronic supply. The dynamic coupled model of the complete drive obtained this way can be iterated over a limited period of time, with a time step adapted to the high frequency of electronic commutations. When the temporary representation of the machine has come, or is expected to have come under a given accuracy threshold, a new FE simulation is performed in order to generate an updated set of lumped parameters, and the process is repeated. This method allows decoupling the time constants of the field problem from that of the circuit problem, which is typically one or two orders of magnitude smaller. This yields a considerable saving of computation time with a controllable, at least a posteriori, loss of accuracy. The method presented in this paper is also characterized by the fact that only known quantities of the nonlinear FE method are used in the identification process, which can therefore be done systematically and in an automated way.

   Coupled Field-Circuit-Mechanical Model of an Electromagnetic Actuator Operating in Error Actuated Control System
By Lech Nowak [View]
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Abstract: An algorithm of coupled field-circuit simulation of the dynamics of an electromagnetic linear actuator operating in error actuated control system is presented. The software consists of three main parts: (a) numerical model of the actuator dynamics which includes equations of a transient electromagnetic field in a non-linear conducting and moving medium, (b) discrete model of electric circuit and (c) optimization solver. Numerical implementation is based on the finite elements. The influence of the PID controller settings on the actuator operation is shown. In order to find optimal parameters of the system the genetic algorithm is applied. The simultaneous optimization of both: actuator structure and regulator settings has been carried out.

   Field and Field-Circuit Description of Electrical Machines
By Andrzej Demenko [View]
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Abstract: The field and coupled field-circuit models of electrical machines are presented. The field model consists of: (a) finite element (FE) equations for the magnetic field, (b) equations describing eddy-currents and (c) equations, which describe the currents in the machine's windings. Moreover the FE equations are coupled by the electromagnetic torque to the differential equations of motion. In the presented field-circuit model the flux linkages with the windings are expressed by two components. One component with inductances and the other described by edge or nodal values of the magnetic potential. The FE equations are derived by using the notation of circuit theory. The approach to consider the differential equation of motion in the simulation is discussed in the paper.

   Modern Design Optimisation Exploiting Field Simulation
By Jan K. Sykulski [View]
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Abstract: The presentation will review some of the new developments in optimisation techniques and their relevance to the design of electrical machines and drive systems. Cost effective algorithms will be explored for computationally expensive modelling processes such as encountered when field simulation techniques are employed in CAD aided design. Surrogate modelling, kriging-assisted methods, pareto-optimality and design sensitivity will be emphasised.

   Simulation and Investigation of Magnetorheological Fluid Brake
By Wiesław Łyskawiński [View]
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Abstract: The paper deals with coupled electromagnetic, hydrodynamic and mechanical motion phenomena in magnetorheological fluid (or simply MRF) brakes. The governing equations of these phenomena are presented. The numerical implementation of the mathematical model is based on the finite element method. Elaborated computer program is used to simulate the operation of MRF brake prototype. In order to verify elaborated algorithm and program, the investigation of the prototype of MR brake is carried out. The dynamic properties as well as mechanical and control characteristics of the brake are determined. The influence of MR fluid properties on functional parameters of the brake is also considered. Chosen results of simulations and measurements are presented.

   Transmission-Line Modelling of Wave Propagation Effects in Machine Windings
By Herbert De Gersem [View]
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Abstract: In this paper, the parameters of a transmissionline model for electrical machine windings are calculated on the basis of a finite-element model of the winding crosssection. Three finite-element formulations are compared: a low-frequency approximation, a high-frequency approximation and an eddy-current formulation. Combining wires into windings and the connection of parts in series or parallel is treated on the level of the transmission-line model. The application to a particular winding configuration indicates the validity ranges of the low- and high-frequency approximations in comparison with the eddy-current formulation. The propagating modes are examined.

EPE-PEMC 2008 - Topic: Analysis and Design of Electrical Drives Using Field-Circuit Models
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2008 - Conference > EPE-PEMC 2008 - Topic: Analysis and Design of Electrical Drives Using Field-Circuit Models
	[return to parent folder]

	An Efficient Field-Circuit Coupling Method by a Dynamic Lumped Parameter Reduction of the FE Model By F. Henrotte, E. Lange and K. Hameyer	[View] [Download]
Abstract: A field-circuit coupling method is presented, whose basic idea is to extract from the FE model, on basis of energy balance considerations, a temporary lumped parameter representation of the electrical machines, to be used in the circuit simulator model of the power electronic supply. The dynamic coupled model of the complete drive obtained this way can be iterated over a limited period of time, with a time step adapted to the high frequency of electronic commutations. When the temporary representation of the machine has come, or is expected to have come under a given accuracy threshold, a new FE simulation is performed in order to generate an updated set of lumped parameters, and the process is repeated. This method allows decoupling the time constants of the field problem from that of the circuit problem, which is typically one or two orders of magnitude smaller. This yields a considerable saving of computation time with a controllable, at least a posteriori, loss of accuracy. The method presented in this paper is also characterized by the fact that only known quantities of the nonlinear FE method are used in the identification process, which can therefore be done systematically and in an automated way.

	Coupled Field-Circuit-Mechanical Model of an Electromagnetic Actuator Operating in Error Actuated Control System By Lech Nowak	[View] [Download]
Abstract: An algorithm of coupled field-circuit simulation of the dynamics of an electromagnetic linear actuator operating in error actuated control system is presented. The software consists of three main parts: (a) numerical model of the actuator dynamics which includes equations of a transient electromagnetic field in a non-linear conducting and moving medium, (b) discrete model of electric circuit and (c) optimization solver. Numerical implementation is based on the finite elements. The influence of the PID controller settings on the actuator operation is shown. In order to find optimal parameters of the system the genetic algorithm is applied. The simultaneous optimization of both: actuator structure and regulator settings has been carried out.

	Field and Field-Circuit Description of Electrical Machines By Andrzej Demenko	[View] [Download]
Abstract: The field and coupled field-circuit models of electrical machines are presented. The field model consists of: (a) finite element (FE) equations for the magnetic field, (b) equations describing eddy-currents and (c) equations, which describe the currents in the machine's windings. Moreover the FE equations are coupled by the electromagnetic torque to the differential equations of motion. In the presented field-circuit model the flux linkages with the windings are expressed by two components. One component with inductances and the other described by edge or nodal values of the magnetic potential. The FE equations are derived by using the notation of circuit theory. The approach to consider the differential equation of motion in the simulation is discussed in the paper.

	Modern Design Optimisation Exploiting Field Simulation By Jan K. Sykulski	[View] [Download]
Abstract: The presentation will review some of the new developments in optimisation techniques and their relevance to the design of electrical machines and drive systems. Cost effective algorithms will be explored for computationally expensive modelling processes such as encountered when field simulation techniques are employed in CAD aided design. Surrogate modelling, kriging-assisted methods, pareto-optimality and design sensitivity will be emphasised.

	Simulation and Investigation of Magnetorheological Fluid Brake By Wiesław Łyskawiński	[View] [Download]
Abstract: The paper deals with coupled electromagnetic, hydrodynamic and mechanical motion phenomena in magnetorheological fluid (or simply MRF) brakes. The governing equations of these phenomena are presented. The numerical implementation of the mathematical model is based on the finite element method. Elaborated computer program is used to simulate the operation of MRF brake prototype. In order to verify elaborated algorithm and program, the investigation of the prototype of MR brake is carried out. The dynamic properties as well as mechanical and control characteristics of the brake are determined. The influence of MR fluid properties on functional parameters of the brake is also considered. Chosen results of simulations and measurements are presented.

	Transmission-Line Modelling of Wave Propagation Effects in Machine Windings By Herbert De Gersem	[View] [Download]
Abstract: In this paper, the parameters of a transmissionline model for electrical machine windings are calculated on the basis of a finite-element model of the winding crosssection. Three finite-element formulations are compared: a low-frequency approximation, a high-frequency approximation and an eddy-current formulation. Combining wires into windings and the connection of parts in series or parallel is treated on the level of the transmission-line model. The application to a particular winding configuration indicates the validity ranges of the low- and high-frequency approximations in comparison with the eddy-current formulation. The propagating modes are examined.