Torque calculation model and structural optimisation of axial magnetic drive mechanism

A torque calculation model based on the magnetic energy theory is established to give a more effective calculation method of torque for axial magnetic mechanism. The relationship between the torque and the relative rotation angle, the gap and the magnetic flux leakage coefficient is analysed. On this basis the structural optimisation model is established and solved. Its purpose is to use the minimum volume magnet to meet the torque requirement. The analysis shows that the gap and the magnetic flux leakage coefficient should be small as much as possible under meeting the structural conditions, and there is a certain relative rotation angle to make torque reach a maximum value. The experiment was carried out and experiment results were compared with the calculation results. The results show when the structure is reasonable, the calculated values of torque are very consistent with the measured values, and the calculation model and structural optimisation model are very effective.