Main shaft bearing internal damage detection system and method based on magnetic field induction

The invention discloses a main shaft bearing internal damage detection system based on magnetic field induction, which is characterized in that the main shaft bearing internal damage detection system comprises a bearing main body and at least one detection device installed at a bearing cavity, and the bearing main body is located in the bearing cavity so as to be lubricated by lubricating grease in the bearing cavity; the detection device comprises a magnet extending into the bearing cavity and a Hall effect sensor used for detecting the magnetic field change of the magnet. When ferromagnetic metal particles generated by damage of the bearing main body and parts in contact with the bearing main body are adsorbed to one end of the magnet, the magnetic flux density at the Hall effect sensor probe located at the other end of the magnet changes, so that the internal damage condition of the main shaft bearing can be monitored by monitoring signals sent by the Hall effect sensor. The invention further discloses a m