The invention provides a double-row permanent
magnet centripetal excitation rectangular open
magnetic field type
low frequency vibration table with
eddy current compensation, belonging to the field of
vibration measurement technology. A rectangular open
magnetic field type
magnetic circuit structure is provided. Two rows of permanent magnets are symmetrically installed at the inner side surfaces of a long
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 surface of a center magnet yoke adjacent to the air gaps is 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 double-row permanent magnet centripetal excitation rectangular open magnetic field type
low frequency vibration table, large
stroke, high thrust, a linear electromagnetic driving force characteristic and high movement guide precision can be considered, and a high precision and large
stroke high performance
low frequency vibration calibration table technical scheme is provided for low-frequency / ultra-
low frequency vibration calibration.