在matlab/simulink下用S-function实现了用递推最小二乘法的系统在线辨识，对象是开关磁阻电动机，在转矩和转速可测的前提下，得出转动惯量，摩擦系数和负载转矩的在线辨识。-In the matlab/simulink using S-function realization of the recursive least squares method using the system online identification, the target is switched reluctance motor, the torque and speed can be measured under the premise reached the moment of inertia, friction coefficient and load transfer Moment of online identification.