There are two causes or cogging force in linear permanent magnet motors, resulting from the slotting and the finite length of the iron-cored. 永磁直线电机的定位力是由铁心开槽及铁心的有限长产生的。
The exact expression is obtained by integration method for a tightly wound rectangular solenoid of finite length, the result is plotted and discussed. 通过直接积分得到了有限长密绕矩形螺线管自感系数的精确表达式，并对结果进行了图示和讨论。
