Magnetic particle clutch - brake must have the necessary material in the magnetic powder (granular magnetic powder), the application field is very wide. But how to detect magnetic particles, is a lot of users have not been exposed. Magnetic particle inspection on the workpiece surface defect detection sensitivity is very high, however, such as the degree of the workpiece surface defect is higher, the detection sensitivity will quickly drop to zero. The principle of magnetic particle detection, when the material or workpiece is magnetized, if the surface of the workpiece or the surrounding surface cracks, cracks and other defects, they will appear in the magnetic leakage field. This magnetic particle will attract, gather the applied magnetic particles in the process of detection to form a display of defects.

In addition, after the parts are magnetic powder, and not all of the defects are able to produce leakage magnetic phenomenon. The relative position of the surface distance of MFL production and defect shape, and defects and lines, the material of the workpiece, the workpiece surface roughness also causes the magnetic leakage phenomenon. At the same time, these factors will affect or reduce the accuracy of magnetic particle testing. Magnetic particle clutch brake can also be combined with the factors of the review of magnetic particle testing whether magnetic leakage phenomenon, such as magnetic flux leakage will affect the performance of the magnetic particle clutch and torque.