机车滚动试验台以轨道轮模拟钢轨，必须解决同步问题。本文对采用机械同步机构的试验台与机车构成的机电系统进行力学和电学的综合分析，寻求产生同步力矩的各种因素，引入不均度的概念，推导出最大同步力矩的计算方法，以此作为机械设计及电路调整中的参考依据。 Locomotive rolling test rig to rail wheel simulation rail, we must solve the synchronization problem. In this paper, the mechanical and electrical systems consisting of the test rig and the locomotive with mechanical synchronous mechanism are analyzed synthetically, and the factors that generate synchronous torque are sought. The concept of unevenness is introduced to derive the calculation method of the maximum synchronizing torque. As a mechanical design and circuit adjustment reference.