Improving efficiency in determining the inductance for the active part of an electric machine's armature by methods of field modeling

Kotsur, M.; Yarymbash, D. S.; Коцур, Игорь Михайлович; Yarymbash, S. T.

doi:10.15587/1729-4061.2019.185136

Cited by 13 publications

(8 citation statements)

References 26 publications

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“…The mathematical description of electromagnetic processes assumes the isotropic nature of the electrophysical and electromagnetic properties of materials, the absence of displacement currents and free charges [20]. In this case, the transient electromagnetic processes in ISEM in the short-circuit mode can be described by a coupled system of nonlinear partial differential equations [21]:…”

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confidence: 99%

“…where A is the magnetic vector potential; V is the electric scalar potential; B is the magnetic flux density; µ, ε r , σ() ate, respectively, the relative magnetic and dielectric permeability, specific electrical conductivity (for each calculation domain it is specified separately according to the magnetic, electrophysical and dielectric properties of materials);  is the temperature; ω is the angular frequency; J e is the density of the external current source; subscripts j correspond to subdomains of the geometric calculation domain. In accordance with [20,21], the system of equations ( 1) is supplemented by the Coulomb gauge condition div(A)=0. Uniform boundary conditions are set on the outer boundaries of the 3D domain of the generalized ISEM geometric model [21]:…”

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“…In accordance with [20,21], the system of equations ( 1) is supplemented by the Coulomb gauge condition div(A)=0. Uniform boundary conditions are set on the outer boundaries of the 3D domain of the generalized ISEM geometric model [21]:…”

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“…Relative to the zero points «0+» and «0-», to which the constant voltage is supplied, it is single-phase, with the number of pairs of poles 2р 2 =8. When studying the processes of electromagnetic energy conversion in ISEM, it is assumed that it is connected to a network with unlimited power and a symmetrical system of phase voltages [21]. Therefore, the initial conditions correspond to the first commutation law [21]:…”

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“…When studying the processes of electromagnetic energy conversion in ISEM, it is assumed that it is connected to a network with unlimited power and a symmetrical system of phase voltages [21]. Therefore, the initial conditions correspond to the first commutation law [21]:…”

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Development of methods for adapting the parameters of spatial end winding sections in 2D circuit-field models of induction-synchronous electric machines

Kotsur

2024

Electrical Engineering & Electromechanics

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Introduction. Recently, the theory of a special class of cascade slow-speed non-contact induction-synchronous electrical machines (ISEM) has been developed. This allowed to obtain a combination of positive properties from conventional induction and synchronous electric machines. Problem. The lack of circuit and field models of ISEM imposes restrictions on further research of electromagnetic, mechanical and energy processes, in transient and quasi-steady modes of its operation. Goal. Development of 3D and adapted 2D circuit-field models of ISEM, decomposition methods, and dynamic synthesis with adaptation of electromagnetic parameter coupling conditions at the boundaries of calculated subdomains of ISEM. Methodology. Spatial elements of ISEM design are represented by separate spatial calculation subareas. The conditions of compliance with electromagnetic processes, which are formed by a complete calculation area and separate spatial calculation subareas of ISEM, are accepted. The influence of end effects and the parameters of the frontal parts of ISEM windings are determined by the inequality of the magnetic field energy of separate calculation subareas. These parameters, including end effects, are displayed as circuit elements in the 2D circuit-field model. Results. The obtained combination of 3D area decomposition methods and dynamic synthesis with adaptation of electromagnetic parameters coupling conditions at the boundaries of its calculated ISEM’s subdomains. The proposed technique for determining the resistance and inductive resistances of the frontal parts of the ISEM windings, taking into account edge effects. The accuracy and effectiveness of the proposed methods is confirmed by the results of an experimental study. Originality. An adapted dynamic 2D circuit-field model of transient processes of ISEM has been developed, which allows taking into account parameters of the frontal parts of its windings. Practical value. The proposed methods can be used for various types of electrical machines. References 27, tables 3, figures 12.

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