Based upon the analysis of the operation of cable reel and its torque motor performance, this article presents methods of calculating cable tension, required capacity of torque motor and main parameters of cable reel. Relevant data are also given in the article for design use. 在分析力矩电动机特性及电缆卷筒工作情况的基础上,文章给出了计算电缆张力、力矩电动机容量以及电缆卷筒主参数的方法,并给出了有关的计算数据,供设计时选用。