synchronous

形容词 synchronous:

1. occurring or existing at the same time or having the same period or phase
   同义词：synchronal, synchronic
2. (digital communication) pertaining to a transmission technique that requires a common clock signal (a timing reference) between the communicating devices in order to coordinate their transmissions

1. The periodic variation in speed of a synchronous motor with respect to the current.
   (同步电动机的)速度偏差同步电机运行速度的周期性变化