摘要
本文分析了电动缝纫机在空载和轻载时的损耗与效率的关系，如果将带动缝纫机的电动机串联一双向可控硅即可减小损耗。
This paper analyzes the relation between efficiency and loss of motor - sewing -machines on no - leaded condition and light - loaded condition. The efficiency of the machines can be increased of their motors are in series with two -way scrs.
