Identification of the parameters of a.c. machines

Modern developments in electrical drives require methods for exact determination of the parameters of electrical machines. Users are mostly interested by methods for parameter identification with a little additional expenditure in device components, but a higher expenditure in software components is usually accepted. The paper describes a parameter identification method by a.c. induction machines, based on a transient run-up test. No additional load or additional speed measurement are required. The supply voltage and the transient behaviour of the stator current during run-up test have to be measured only. For the parameter identification a nonlinear optimization procedure is used. Practical results with small single-phase capacitor motors and three-phase squirrel-cage induction motors are presented.