Investigation on Mathematical Exact Model for Actual System.

Motor systems are mainly acted as the devices which produce driving forces. Besides, it is found by carefully observing the condition of motor system that the motor systems may have an examining function about work conditions. In this case, it is required that parameters of the motor systems can be accurately identified, and the mathematical model established for these motor systems must be correct. Nevertheless, the mathematical model established for these motor systems is sometimes ambiguous, or the mathematical model sometimes changes with the change of work conditions. Under these circumstances, the mathematical model established originally is not agree with the actual motor system. So it is impossible to identify the correct parameters. In this paper, an example is given as the case that the mathematical model established originally is not correct. Subsequently, the error between the ambiguous mathematical model and current value of the actual motor system is evaluated. Finally, on the basis of the error evaluation, we try to propose the mathematical model with higher precision.