That means you need your vectorfield to be continuous and differentiable everywhere on the surface s.
也就是，向量场是连续的，且在曲面s上处处可微。
2
The continuous rotating magnet field is transformed into discrete step field in the torque vector control and the electromagnet torque is controlled by means of regulating the stator current.
在矩角控制过程中将连续的旋转磁场离散为步进磁场，通过控制电机定子电流实现对电磁转矩的控制。
3
Based on the conservative condition of vector lines of variable field in the continuous medium, the problems of electromagnetic field in the moving system are discussed in this paper.