Cylindrical enclosed magnetic-field-type electromagnetic shake table magnetic circuit structure centripetally excited by long permanent magnetism tube

A cylindrical enclosed magnetic-field-type electromagnetic shake table magnetic circuit structure centripetally excited by a long permanent magnetism tube belongs to the technical field of vibration measurement. A cylindrical enclosed magnetic field structure is provided, the permanent magnetism tube is coaxially assembled in the inner part of a long cylindrical outer magnet yoke in a bonded manner, magnetic poles of the inner cylindrical surface of the permanent magnetism tube are identical in polarity, an enclosed magnetic circuit is formed through magnet yokes, and a magnetic field high in uniformity is generated in an air gap. After a working coil is powered on, the working coil in the magnetic field is affected by a Lorentz force and generates a precise and controllable electromagnetic driving force. The surface, adjacent to the air gap, of a central magnet yoke is provided with an array-type microstructure arranged in a deep channel mode, and the eddy current loss can be effectively inhibited. According to the invention, a large stroke, high magnetic field uniformity, a large thrust and linear electromagnetic driving force characteristics can be considered at the same time, defects of an existing technical scheme are effectively overcome, and a high-precision and large-stoke electromagnetic shake table magnetic circuit structure technical scheme is provided for low-frequency/ultralow-frequency vibration calibration.