Abstract:A novel double differential voice coil motor with shaft support is proposed to meet the demands of high supporting rigidness and big thrust force, which realizes the optimal using of the magnetic field in compact space and increases the motion efficiency of voice coil motor. The mechanical design was performed, which used two loop-shaped permanent to build inner and external working magnetic airgap. Each airgap have one coil set. The magnetic field was designed by analysis of the finite element model. The structure parameters were optimized under the aim of magnetic field’s evenness and maximum magnetic strength. The prototype was manufactured and the characteristics of output force, frequency characteristics were tested. The test results demonstrated that the differential voice coil motor has a higher thrust force, and the motion is smooth in the working range, and the motion efficiency can meet the design expectation.