Patent ID: 8868365

Claim:
A system of generating an external parameter value for a separately excited motor controller, comprising a digital signal processor, a calibration coefficient generating module, a calibration coefficient storing module, and an external parameter generating module, wherein: the digital signal processor is adapted to convert a received analog electrical signal into a digital signal and to scale the digital signal, so as to generate a parameter value in conformity with a data format of the system; the external parameter generating module is adapted to adjust the parameter value with a calibration coefficient to obtain an external parameter value, the calibration coefficient being generated by the calibration coefficient generating module and being pre-stored in the calibration coefficient storing module; and the calibration coefficient generating module is adapted to read the parameter value generated by the digital signal processor and at the same time obtain an actual measuring value as a reference parameter value, to calculate a difference value between the parameter value from the digital signal processor and the reference parameter value, and to generate the calibration coefficient from a ratio of the reference parameter value to the parameter value obtained from the digital signal processor if the difference value exceeds a preset value.