this paper deal with three-loop control system for synchronouns motor, stator current loop, var-current loop, exciter current loop . how to monitoring synchronizing error, and using 80196kc to control exciter 本文讨论了三环控制的同步电动机励磁系统,即定子电流环,无功电流环和励磁电流环。以及同步电动机失步检测及以80196kc进行控制的方法。