A vibration sensor is made of permanent magnet components based on levitation theory

magnetic force simulation on permanent magnet component is carried out applying ANSYS

the optimal combination of factor order which affects the magnetic force can be found.According to theory of magnetic circuits

magnetic force formula can be derived

and magnetic force formula is verified by ANSYS simulation

it can be found that within the area of micro displacement

simulation value is fit to theoretical value

and there is a linear relationship between amplitude and magnetic force of hybrid magnet.Second order equations in dynamics of sensor system can be derived.After testing of the vibration sensor through standard vibrator

the sensitivity is 213 V·s·m-1

which is higher than traditional magnetoelectric sensor.The sensor is used for collecting low frequency vibration signal very well.