The spin eccentricity of the ball rotor of a fuze or the bias of the center of the figure of the ball rotor about the spin axis of a projectile during arming is an important parameter in analysis and calculation of the working character for the ball rotor of a fuze.

The aims of study and analysis on fuze ball rotor structure are delaying the arming time, decreasing the spread of the arming time and enhancing the reliability of the fuze, so that this typical fuze structure which is simple can be used better than before and applied to a large-caliber spinning projectile.

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Fuze ball rotor not only can ensure detonator safety,but also is one of arming delay devices.

The safe separation of a projectile is analyzed from both explosion shocks and fragment killability respectively and the requirements of the muzzle safety of a projectile fuze are discussed according to the requirements on the arming delay in 《Safety Criteria for Fuze Design》 by using ballistics, explosion dynamics and power design theory.

It not only can ensure primary explosive safety, but also is one ofarming delay devices.

In order to accurately determine the performance index of the mortar shell fuze arming distance,the mass center exterior ballistics of mortar shell is computed,the power characteristics of mortar shell and rifled-bore gun shell are contrasted,the delay arming performance of foreign standard mortar shell fuze is concluded,the firing operation conditions of mortar shell are analyzed.

The centroid-variable slider theory which is applied to the fuze delay arming is put forward in this paper.

According to the characteristics of the ball-rotor and pellet, the principle and structure frame of the ball-rotor with variable moment of inertia are first put forward, the work speciality of this new delay arming device in small caliber fuze are analysed and studied in this paper.