There are many shortcomings in difficult starting in the synchromotor. Its application is limited to a great extent.
但同步电动机存在起动困难的缺点，使它的应用在很大程度上受到了限制。
2
A new device which can change the optical frequency shift is described. It consists of a rotating grating, a synchromotor and a power supply whose frequency can be adjusted.
本文描述一台能改变光频移频率的新装置，它由旋转光栅、同步电机和调频电源组成。
3
The paper presents a kind of circuit to solve the starting of the high capacity synchromotor, and introduces the formation of the starting device and th…