Long cylindrical tube closed permanent magnetic field electromagnetic shaker excitation magnetic structure centripetal

Long permanent tube vibration measurement to the technical field of magnetic cylindrical closed electromagnetic shaker excitation magnetic structure heart; to provide a cylindrical design enclosed magnetic field, the permanent adhesive tube coaxially fitted in a long cylindrical inside the outer yoke, the permanent magnet tube inner cylindrical surface of the same polarity magnetic pole, a closed magnetic circuit through the yoke, resulting in high uniformity of magnetic field distribution in the air gap, the work coil is energized by the Lorentz force in a magnetic field, electromagnetic drive force generated in a tightly controlled, and the center of the air gap adjacent surface of the yoke is provided with an array of deep trenches in the form of micro structure, can effectively suppress the eddy current loss; the present invention can be both large stroke, high magnetic field homogeneity, a large thrust and a linear electromagnetic driving force characteristic, can effectively solve the deficiencies of the prior art solutions exist to provide a high precision low frequency / ultra-low frequency vibration calibration, a large electromagnetic shaker travel to the constitution of the magnetic circuit.