Electromagnetic system with adjustable magnetic biasing in the magnetic circuit
By installing an inductor with a core part and bias winding in the central hole of the magnetic core, connected to radial protrusions, the design addresses material and loss issues in transformers, enhancing compactness and efficiency.
Patent Information
- Authority / Receiving Office
- UA · UA
- Patent Type
- Utility models
- Current Assignee / Owner
- MYKOLAYIV NATIONAL AGRARIAN UNIVERSITY
- Filing Date
- 2026-02-12
- Publication Date
- 2026-07-01
AI Technical Summary
Existing transformer designs with longitudinal or transverse biasing suffer from increased material consumption, active power losses, and manufacturing complexity due to separate winding sections and central holes in core elements, which affect performance and compactness.
A design where an inductor with a core part and bias winding is installed in the central hole of the magnetic core, connected to radial protrusions formed by bending ferromagnetic tubular blanks, minimizing coil lengths and eliminating central holes, thus reducing material usage and losses.
This design reduces material consumption and active power losses by 6-10% and enhances compactness and manufacturing simplicity, improving the mass-value indicators and energy efficiency of multiphase transformers and reactors.
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Abstract
Description
The utility model belongs to the field of transformer construction and can be used in production of multiphase transformers and reactors with bias control magnetic core with direct current to change voltage and inductance. The technical result of the utility model is a reduction in material consumption, active power losses and laboriousness of production. Known electromagnetic transformer system with magnetic flux and voltage regulation by longitudinal biasing, which contains a symmetric spatial magnetic circuit with yoke and rod elements and winding coils of alternating current phases and longitudinal direct current biasing (USSR A.S. No. 792303, class H01F 31 / 06, 12 / 30 / 1980). The yoke elements of the magnetic circuit form separate circuits separated by a gap. Coils the bias windings cover the areas of the yoke elements separated by the specified gap, and create constant contour magnetic fields. Superimposing a constant component of a magnetic field on a variable one causes nonlinear distortions. of the resulting magnetic field, which leads to a deterioration in the transformer performance. The specified the negative impact is eliminated by mutual compensation of nonlinear phase distortions electromotive forces, which is achieved by counter-switching the contour bias coils. However, the presence of two magnetic circuit circuits and the division of the bias winding into two separate sections with coil sides located in the gap leads to a deterioration in mass-values transformer performance and increased losses. The features of the specified electromagnetic system that coincide with the utility model are the presence of symmetrical spatial magnetic circuit with yoke and rod elements, as well as winding coils of alternating current phases and direct current biasing. Also known is the electromagnetic system of a transformer or reactor with a transverse magnetization by direct current, which contains a symmetrical spatial magnetic circuit with flat end surfaces and a central hole, with jugular and rod elements, as well as winding coils of alternating current phases and transverse bias (patent of Ukraine No. 70866A, class H01F 29 / 14, 10 / 15 / 2024), which is accepted as a prototype. The transverse bias coils cover the middle parts of the core elements and their sides located in the central holes of these elements. Transverse bias eliminates nonlinear distortion when adjusting alternating magnetic flux, voltage and inductance, respectively, transformer and reactor. Material consumption and losses are reduced by using a single transverse winding bias instead of two oppositely connected winding sections of longitudinal bias. However, the presence of central holes in the core elements increases the dimensions of the external the contour of the rods and leads to an increase in the average length of the turns of the alternating current phase coils, material consumption and losses. The features of a close analogue that coincide with the utility model are that the electromagnetic the system contains a symmetric spatial magnetic circuit with flat end surfaces and with a central hole, with yoke and rod elements, as well as phase winding coils alternating current and transverse bias. The utility model is based on the task of improving the design of the electromagnetic system with regulation of the bias of the magnetic core, in which the combination of design features provides reduction of material consumption and active power losses of multiphase regulated transformers and reactors. The problem is solved by the fact that in an electromagnetic system with regulation magnetization of a magnetic circuit, which contains a symmetric spatial magnetic circuit with flat end surfaces and a central hole, with jugular and rod elements, as well as winding coils of alternating current phases and transverse bias, according to the utility model, in An inductor with a core part covered by a magnetic core is installed in the central hole of the magnetic core. a bias winding and connected to radial protrusions adjacent to the end surfaces of the jugular elements. Radial protrusions are formed by bending at 90° the sections between the slots at the ends of the ferromagnetic tubular blanks and forming flat surfaces on these areas. The combination of the above features, namely the installation of an inductor in the central hole of the magnetic core with a core part covered by a bias winding and connected to radial protrusions, adjacent to the areas of the jugular end surfaces, ensures the minimization of average lengths turns of the bias winding and alternating current phase coils. At the same time, the mass of the magnetic core is reduced due to the removal of the central holes in core elements. Accordingly, losses in the windings and magnetic core are reduced, and the mass-value and energy indicators and the compactness of the adjustable transformer increases or reactor. Formation of radial protrusions of the inductor by bending the sections between the slots at the ends at 90° ferromagnetic tubular blanks and forming flat surfaces on these areas simplifies design and reduces the complexity of manufacturing the inductor. The utility model is illustrated with drawings explaining the essence of the designs of the variants electromagnetic systems with transverse magnetization of magnetic cores. In Fig. 1 and 2, as well as in Fig. Figures 3 and 4 show top and side views of a three-phase reactor and transformer converter. phase numbers from m1=3 to m2=6 with sections explaining the essence of their structure, and Fig. 5 and 6 show the diagrams tubular billet and solid structure of the transverse bias inductor. The electromagnetic systems shown in Fig. 1-4 contain symmetrical twisted magnetic circuits 1 with flat end surfaces 2 and a central hole 3, with jugular 4 and rod 5 elements, as well as winding coils of alternating current phases 6 and coils of transverse bias 7. An inductor 8 with a core part 9 is installed in the central hole 3 of the magnetic core 1, covered by the bias winding 7 and connected to the radial protrusions 10 adjacent to sections 11 of the end surfaces 12 of the jugular elements 4. In the designs shown in Fig. 3 and 4, the radial protrusions 10 of the inductor 8 are formed by a 90° bend. sections 13 between slots 14 at the ends of ferromagnetic tubular blanks (Fig. 5) and crimping these areas 13 with the formation of flat surfaces 15. When the reactor (Fig. 1, 2) or transformer (Fig. 3, 4) is operating, the coils 7 form a flux of a constant magnetic field, which is closed through the rod part 9 and the protrusions 10 of the inductor 8 and sections 11 of the yoke elements 4 between the end surfaces 12. Lines of force of a constant magnetic field in sections 11, the yoke elements 4 are directed orthogonally to the direction of the alternating magnetic field. By weakening or strengthening the direct current in the coils 7, in the absence of nonlinear distortions, regulation of magnetic permeability and alternating magnetic flux magnetic core 1, which leads to regulation of reactance and output voltage, respectively, reactor and transformer. Compared to the prototype, the use of technical solutions (Fig. 1-6) due to the minimization of volumes and metal capacity of active elements improves mass-value indicators of varieties of inductive static devices by 6…10% with a reduction of 4…6% in active power losses. Thanks to the installation inductor into the central axial cavity increases the compactness of electromagnetic systems (Fig. 1- 4). Replacing the assembly of the inductor's magnetic core from separate elements with its integral one forming from tubular ferromagnetic blanks (Fig. 5, 6) reduces metal content and the complexity of manufacturing the biasing device.
Claims
1. An electromagnetic system with regulation of the bias of the magnetic circuit, which contains symmetrical spatial magnetic circuit with flat end surfaces and a central hole, yoke and rod elements, as well as winding coils of alternating current phases and transverse bias, which is characterized by the fact that in the central hole an inductor with a core part covered by a winding is installed in the magnetic core biasing and combined with radial protrusions adjacent to the end surfaces of the jugular elements.
2. The system according to claim 1, characterized in that the radial protrusions of the inductor are formed by bending at 90° sections between the slots at the ends of ferromagnetic tubular blanks and the forming on these areas of flat surfaces.