做同步电机的仿真,PI控制中老出错,错误提示:Derivative input 1 of 'xitong4/PI3/Integrator1' at time 0 is Inf or NaN. Stopping simulation. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances).
请高手指点一下,该怎么办!