Rectangular open magnetic field type low-frequency vibration calibration table with double-magnetic-circuit two-end symmetric excitation

Abstract

The invention provides a rectangular open magnetic field type low-frequency vibration calibration table with double-magnetic-circuit two-end symmetric excitation, belonging to the field of vibration measurement technology. A rectangular open magnetic field type magnetic circuit structure is provided. Two permanent magnets are symmetrically installed at two ends of a center magnet yoke and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The strong magnetic field distribution with high uniformity is generated in air gaps. After a working coil is energized, the working coil is affected by Lorentz force in a magnetic field, and precisely controllable electromagnetic drive force is generated. The surfaces of the magnet yokes adjacent to the air gaps are provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. The organic integration design of air lubricated guide technology is employed, and outstanding electromagnetic drive mechanical performance and high movement guide precision are obtained at the same time. According to the rectangular open magnetic field type low-frequency vibration calibration table, large stroke, high thrust, a linear electromagnetic driving force characteristic and high movement guide precision can be considered, and the high performance low frequency vibration calibration table is provided for low-frequency / ultra-low frequency vibration calibration.

Description

technical field

[0001] The invention belongs to the technical field of vibration measurement, and mainly relates to a rectangular open magnetic field type low-frequency vibration calibration platform with symmetrical excitation at both ends of a double magnetic circuit. Background technique

[0002] In the field of vibration measurement technology, the vibration calibration table that generates standard vibration signals is the core equipment to achieve high-precision vibration calibration, and it is also an important equipment that constitutes the national vibration measurement technology system. The high-precision vibration calibration table generally adopts the form of electromagnetic vibration table. In recent years, aerospace, building bridges, earthquake prevention and disaster reduction and other fields have raised the need for low-frequency / ultra-low-frequency vibration calibration. In order to improve the signal-to-noise ratio of the standard vibration signal and e...

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