Analysis method of bias magnet characteristic of electric sheet

Abstract

The invention relates to an analysis method of a bias magnet characteristic of an electric sheet. According to design parameters and power input conditions, an independent Kirchhoff voltage and current equation set of an equivalent circuit is established, and the pressure drop of a cored winding is represented by a series connection form of a change rate dB / dt of magnetic density B, leakage inductance L and a winding resistance rL. In the analog computation, according to a typical hysteresis loop and a magnetization curve of ferrous materials, the maximum flux density Bm and the maximum coercive force Hc are determined, an initial value can start from zero and stepwise perform uplink increase or downlink increase according to history operating points which reflect the hysteresis characteristic in the hysteresis loop, another hysteresis loop process is started after one cycle period, and obtained delta B / delta t and H value of corresponding current must meet the Kirchhoff voltage and current equation set. A method of numerical approximation includes that under constraint conditions limited by the maximum hysteresis loops Bm and Hc, equal interval time delta t is used for simulating B-H tracks under any bias magnet conditions. The analysis method of the bias magnet characteristic of the electric sheet is simple in process and thinking, practical and convenient.

Description

technical field [0001] The invention is an analysis method for the bias magnetic properties of electrical steel sheets, in particular to an analysis method for the electromagnetic properties presented by ferromagnetic materials in practical applications. It is an important auxiliary means for the design of motors, transformers, and reactors, and belongs to electrical steel sheets. The innovative technology of the analysis method of the reactance characteristic reflected under the bias magnetic condition. Background technique [0002] Electrical steel sheet is a kind of soft ferromagnetic material, and it is also the basic raw material for the production of power transformers, reactors and motors. Its characteristics determine the performance and quality of these power equipment. In the traditional design, it is generally designed according to the typical magnetization curve provided by the manufacturer, but the typical curve provided by the manufacturer is generally a pure A...

AI Technical Summary

Problems solved by technology

[0003] With the rapid development of various fields of electrical engineering, various intelligent control technologies based on modern control theory continue to emerge, and then the nonlinear hysteresis characteristics presented in the practical application of ferromagnetic materials involved in electrical engineering give advanced control Technology has brought great difficulties, especially the working performance of ferromagnetic materials under biased magnetic conditions is even more difficult to estimate. The biggest feature of this process is that the hysteresis characteristics of ferromagnetic materials are related to historical working conditions, and this characteristic It is the key that is difficult to deal with in the design of various electrical equipment based on electromagnetic coupling, such as the prevention of various asymmetric faults, and the design of magnetic control reactors. This also brings uncertainty to the switch design for electrical control, making the equipment Reduced overall reliability

Images