For the sake of study the pressure capability of ferrofluid seals with small sealing gap,a diverging stepped ferrofluid structure with small sealing gap was designed according to the theory of stepped ferrofluid and magnetic path design,and the length and cross-sectional area of the permanent magnet(NeFeB)are obtained.On the basis of these parameters,the ferrofluid distribution of seal gap is calculated by using the magnetic ferrofluid element method,and the pressure capability is obtained,then the reliability of the magnetic path design is obtained according to the capability of withstand voltage.There are some findings as following after analysis and comparison.It is the magnetic flux leakage at the junction of the pole boot and NeFeB that cause pressure capability calculated by the magnetic path method is lower than that calculated by the finite element method.
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