Three-dimensional standard magnetic field generating device based on phase synchronization

Abstract

Disclosed is a three-dimensional standard magnetic field generating device based on phase synchronization. The device is composed of a variable-frequency power source module, a capacitance matching module, a phase detecting module and a three-dimensional Helmholtz coil. Firstly, voltage and frequency of the variable-frequency power source module are set by the variable-frequency power source module according to requirements, and corresponding capacitance is chosen by the capacitance matching module so as to reduce the influence of coil inductance on magnetic induction intensity, and then one side of adjusted three-phase power source signals is connected to the phase detecting module so as to ensure the phase synchronization of a three-dimensional magnetic field by adjusting an initial angel of a variable-frequency power source according to the phase detecting result, and another side of the adjusted three-phase power source signals is connected to the three-dimensional Helmholtz coil so as to enable the three-dimensional Helmholtz coil to generate a dynamic alternating magnetic field. Magnetic fields with even height in alternating current or direct current can be generated in any direction so as to provide a magnetic field environment for characteristic testing of a magneto-dependent sensor. The three-dimensional standard magnetic field generating device is good in practical value and application prospect in the technical field of electronic measurement.

Description

technical field [0001] The invention relates to a three-dimensional standard magnetic field generating device based on phase synchronization of a three-phase power supply, belonging to the technical field of electronic measurement. Background technique [0002] With the development and wide application of magnetic sensors, their characteristic testing has attracted more and more attention. However, due to the incomplete research on its mechanism and the harshness of the required test conditions, the current testing methods lag far behind the development of sensors. . The standard magnetic field generating device with wide width and wide frequency characteristics is the premise to realize the comprehensive test of the characteristics of the magnetic sensor. As a standard magnetic field environment for magnetic sensors, the requirements for the magnetic field are mainly reflected in three aspects: magnetic field strength, magnetic field uniformity, and magnetic field space. ...

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Problems solved by technology

However, the traditional one-dimensional or two-dimensional Helmholtz coils only generate one-dimensional or two-dimensional DC magnetic fields. Although the existing three-dimensional Helmholtz coils can generate AC and DC magnetic fields in any direction, due to the influence of coil inductance , the magnetic induction intensity generated by the coils will be limited. In addition, due to the different resistance and inductance ratios of the three coils, the current phases generated by the power supply with the same phase are different, which will lead to different phases of the generated dynamic magnetic field, which will not be conducive to the synthesis of the three-dimensional magnetic field

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