Like synchronous motor, rotor magnetic pole center line could lagged behind an Angle of that of air-gap magnetic field under the function of load torque (called angular displacement).
步进电动机象同步电动机一样，在负载转矩的作用下，转子磁极中心线将滞后于气隙磁场的中心线一个角度，称为失调角。
The velocity of center line is maximum, and the edge is minimum with the same time interval. The velocity of magnetic fluid reduces from the center line to edge.
相同的时间间隔内，泵腔中心线处的速度最快，向两侧处的速度逐渐降低，两侧处的速度最低。
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