Field‐circuit model of the dynamics of electromechanical device supplied by electronic power converters

Nowak, Lech; Mikołajewicz, Jacek

doi:10.1108/03321640410553409

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…In a single time step, the field distribution is calculated dozens or even hundreds of times, and therefore it is very important to elaborate an effective procedure for the x n determination. In the proposed algorithm, the displacement in the first iteration of each time step is assumed on the basis of Newton's polynomial extrapolationxðtÞ of the function x(t) (Nowak and Mikołajewicz, 2003). Then the mesh is re-generated and field distribution F n and electromagnetic force F en are computed.…”

Section: Discrete Model Of the Dynamicsmentioning

confidence: 99%

“…If the computed and assumed values of the displacement x n differ more than it is permitted by incorrectness 1 x then, using the chord procedure, the next value of x n is assumed. After the iteration process is over, the velocity v n is determined using formula ( 9) and subsequently substituted into the set of the FEM equations (Nowak and Mikołajewicz, 2003).…”

Section: Discrete Model Of the Dynamicsmentioning

confidence: 99%

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Reducing power losses in axisymmetric electromechanical converters

Mikołajewicz

Nowak

2006

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. AbstractPurpose -The aim of the paper is to find the effective methods of power loss reduction in axisymmetric electromagnetic devices and improve their dynamic parameters. As an example the linear tubular motor is considered. Design/methodology/approach -The elaborated algorithm has been applied to analyze the dynamic operation of axisymmetric electromagnetic devices, especially tubular linear induction motors. The mathematical model of transients includes: the equation of electromagnetic field, the equations of electric circuits and the equation of motion. The model is based on the finite element method. For the time-stepping, the Cranck-Nicholson scheme is applied. In order to include non-linearity, the Newton-Raphson process is adopted. Findings -In order to reduce the influence of eddy currents, it is suggested that the solid core should be equipped with one or several radial slots. In such a case, the radial component of eddy currents occurs near the slot and disturbs the axial symmetry of the system. However, when the width of the slot is small, the fields generated by the radial component of eddy currents on both sides of the slot practically cancel one another and the system can still be considered axisymmetric. Another solution given in the paper consists of replacing the cylindrical core with a system of flat laminated segments. In such a case, saturation of the ferromagnetic parts is greater than in the case of classical axisymmetric core. Originality/value -In the paper, new quasi-2D axisymmetrical field-circuit methodology for electromagnetic device dynamics analysis has been elaborated. Proposed constructional solutions enable one to reduce the power losses in the primary core by half and total losses by 30 percent.

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Section: Discrete Model Of the Dynamicsmentioning

confidence: 99%

Section: Discrete Model Of the Dynamicsmentioning

confidence: 99%

Reducing power losses in axisymmetric electromechanical converters

Mikołajewicz

Nowak

2006

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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“…Magnetic field distribution inside the electric machine has been calculated by 2D [7,8] and 3D FEM [9]. An external electric circuit can include an inverter supply system [10], distorted voltage-excited sources [9] and even control loops [11]. Commercially available software such as Ansys Maxwell or Comsol allows for simulating transient states based on FC-FEM [11,12].…”

Section: Introductionmentioning

confidence: 99%

Two Models for Time-Domain Simulation of Hybrid Magnetic Bearing’s Characteristics

Wajnert

Tomczuk

2022

Sensors

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A comparison of two developed simulation models for a hybrid magnetic bearing (HMB) transient states is presented. This applies to analyses using the flux-circuit directly coupled magnetic equivalent circuit and field-circuit indirectly coupled finite element analysis. The required control system was implemented for both models. The results obtained from the simulations were compared with those obtained from measurement tests.

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Optimization of the synchronous motor with hybrid permanent magnet excitation system

Knypiński

Nowak

Demenko

2015

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose -The purpose of this paper is to elaborate an algorithm and the software for the rotor structure optimization of the permanent magnet synchronous motor (PMSM) with a magnet composed of two materials made with the use of different technologies: sintered Neodymium magnets and powder dielectromagnets. To execute of optimization of selected motor structure using the non-deterministic procedure. Design/methodology/approach -The mathematical model of the devices includes: the equation of the electromagnetic field, the electric circuit equations and equation of mechanical motion. The numerical implementation is based on finite element method and step-by-step algorithm. The genetic algorithm has been applied in the optimization procedures. The computer code has been developed. Findings -The elaborated computer software has been applied for the optimization and design of PMSMs. The elaborated algorithm has been tested and a good convergence has been attained. The parameters of two optimal structures of PMSM motors have been compared. Originality/value -The presented approach and computer software can be successfully applied to the design and optimization of different structure of PMSM with different type of rotors. IntroductionThe continuous development of materials engineering has made it possible to produce permanent magnets of high energy density, with better magnetic and thermal properties. Nowadays, manufacturers and users of electrical machines pay special attention to energy efficiency of the devices. Hence, in order to make permanent magnet motors more and more efficient there is an enormous interest in the development of their constructions. In comparison to other types of electrical machines, the permanent magnet synchronous motors (PMSMs) have many advantages: high efficiency, low operating costs, long operational life, large torque-to-mass ratio and good dynamics performance (Lindth et al., 2009). Diversity of motors applications and variety of permanent magnet types have an essential effect on the structures of this kind of machines. The PMSM rotor construction, i.e. location, size and shape of the permanent magnets has substantial effect on the machine properties (Barcaro and Bianchi, 2013). The magnets may be glued to the rotor surface (surface mounted magnet) or buried in the rotor (buried magnet) (Hahn, 2012;Faggion et al., 2013).Recent years have witnessed rapid development of magnetic powder technology. This concerns both: soft and hard magnetic material. The powder technology enables free formation of the element geometries and control over their magnetic properties -depending on the admixtures used. The design and construction of excitation systems consisting of two or more different materials is also possible (Nowak, 2013).

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Field‐circuit model of the dynamics of electromechanical device supplied by electronic power converters

Cited by 5 publications

References 3 publications

Reducing power losses in axisymmetric electromechanical converters

Reducing power losses in axisymmetric electromechanical converters

Two Models for Time-Domain Simulation of Hybrid Magnetic Bearing’s Characteristics

Optimization of the synchronous motor with hybrid permanent magnet excitation system

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