Magnetic levitation system generally uses electromagnet to realize suspension control of suspended substance

electromagnetic force between electromagnet and suspended substance is closely related to its air-gap of magnetic field

high-precision detection of magnetic field gap concern suspension control performance. A magnetic field air-gap detection solution based on TMR array is put forward. Choose small size

high sensitivity

high precision TMR as magnetic sensing component

multiple spot is carried out in air-gap magnetic field to detect the whole air-gap magnetic field distribution by sensor array. Based on the solution

develop magnetic field detection experimental system to carry out test verification

focus on establishment of standard magnetic field and design of magnetic shielding structure. The experimental results show that the air-gap magnetic field detection solution based on TMR is proved to acquire good result

measurement uncertainty after compensation may reach to ± 0. 5 % FS.