6 results about "Magnetic path length" patented technology

The invention relates to a special-shaped magnetic core loss test method. The method comprises the following steps: determining an equivalent standard magnetic core based on the shape of a special-shaped magnetic core; calculating the effective sectional area, the effective magnetic path length and the effective volume of the special-shaped magnetic core based on the equivalent standard magnetic core; calculating a test working voltage required by the magnetic core loss test based on a test working frequency, a test working magnetic flux density, the effective sectional area and the number of effective coils; and performing the magnetic core loss test based on the number of the effective coils, the test working frequency, the test working voltage, the effective sectional area, the effective magnetic path length and the effective volume. Therefore, the loss test of the special-shaped magnetic core can be realized.

A special-shaped magnetic column structure of an electric reactor is characterized by comprising a first magnetic column set composed of two cylindrical magnetic columns and a second magnetic column set composed of two semi-arc-shaped magnetic columns, the first magnetic column set and the second magnetic column set are arranged in an orthogonal mode, the two cylindrical magnetic columns are arranged oppositely, and the two semi-arc-shaped magnetic columns are arranged oppositely. According to the utility model, the magnetic columns forming the magnetic core are designed into special-shaped structures, so that the winding space and the magnetic circuit length are effectively increased, and the load resistance of the product is effectively enhanced; the magnetic core outer column is changed from a square to a circle, and the circumference of the circle is shortest under the condition that the sectional areas of the magnetic cores are equal, so that the copper wire consumption can be reduced, and the product cost can be reduced.

This invention provides a method for detecting and calculating the austenite content in steel based on a permeability meter, relating to the fields of steel and electromagnetics. Based on the theoretical differences in saturation magnetization of different phases in ferromagnetic materials, this invention establishes a theoretical calculation model and detection method for measuring austenite content using a permeability meter. A standard-prepared sample is placed in a magnetic pole shoe, and the magnetic field strength H corresponding to the maximum permeability of the ferromagnetic material is first measured. μ Then at ≥1.5H μ Under a magnetic field strength of J, the polarization intensity of the magnetic field strength at multiple points was measured at continuous intervals. m Then, based on the saturation magnetization approximation law and derivation law, the saturation magnetization Js is fitted and solved. Finally, the austenite content is determined according to the theoretical calculation model of austenite content. The method described in this invention solves the influence of the constantly changing effective magnetic path length of traditional magnetometers on the measurement results. The method for determining austenite content is simple, has a solid theoretical basis, high measurement accuracy, and strong data repeatability.

The application relates to the technical field of transformer assembly, and discloses a power-saving device three-dimensional winding core assembly which comprises a core assembly and a mounting shell, the core assembly comprises a lower support fixedly installed at the bottom of the inner cavity of the mounting shell, the top end of the lower support is fixedly installed with a core, and an upper support is arranged at the top end of the three groups of cores to fix the top end, and a pull rod with a hollow structure is arranged between the lower support and the upper support. The power-saving device three-dimensional winding core assembly effectively avoids the problem of lap joint seams in the core, so that there is no obvious high-resistance area or the phenomenon of magnetic flux density distortion at the lap joint seams, and the magnetic path length of the three groups of cores is completely equal and the sum of the magnetic path lengths is the shortest, and the magnetic paths among the three groups of cores are completely symmetrical and the no-load current is completely balanced.

This invention discloses a modular integrated plate-type saturated reactor assembly, comprising a main body, a magnetic core, and a base. The magnetic core is fixedly mounted on the upper surface of the base, and several windings are fixedly arranged on its peripheral side. Several partition structures and busbar assemblies are provided on the magnetic core, and several guide brackets are positioned above it. A magnetically guided slider slides within each guide bracket. A driving mechanism is provided within the guide brackets to drive the magnetically guided sliders to slide along the guide brackets. When the driving mechanism is activated, the magnetically guided sliders move above two adjacent magnetic core partitions, connecting or disconnecting these two partitions in the magnetic circuit. This invention uses magnetically shielding sheets filled in the partition slots to divide the magnetic core into multiple independent partitions. Electromagnets drive the magnetically guided sliders to move above two adjacent magnetic core partitions, connecting or disconnecting these two partitions in the magnetic circuit, thereby changing the magnetic circuit length and volt-second product of the magnetic core, avoiding customized design and reducing repetitive work.

This invention provides a magnetic sensitive element, a method for measuring an external magnetic field using the same, and a magnetic sensor. The magnetic sensitive element includes first and second magnetic cores, and first and second coils. The first and second coils have equal numbers of turns, equal magnetic circuit lengths, and opposite winding directions. The first and second magnetic cores have equal permeability, and the cross-sectional areas of each section perpendicular to the magnetic circuit direction in the first and second magnetic cores are equal. Under the action of an excitation current I(t) of the same magnitude but opposite direction, the first and second coils generate a magnetic field. When the excitation current is +I... s to‑I s When the magnetic field strength varies within the range of +H, s To -H s The B-H characteristic curves of the first and second magnetic cores exhibit linear variation within a given range. This component has a simple structure, reducing the requirements for the magnetic cores and lowering costs. In actual measurements, the first and second magnetic cores operate within this linear range. By measuring the inductance values ​​of the two sets of coils, the applied external magnetic field information can be obtained. This method is simple and easy to implement, and it improves detection accuracy.