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.