Asynchronous motor´s more-accurate equivalent circuit parameter determining by auto 2fit

The accuracy of the equivalent circuit parameters of asynchronous motor always abstracts special concern and is also a hot research item for high performance control. Based on the deduced parameter equations, using auto 2fit software, a more accurate numerical solution to the parameter determining through a no-load experiment, a locked-rotor experiment plus an additional load experiment distinguished to the traditional method can be worked out directly and quickly without assumptions in physics or any given initial values for calculation. The possibilities are also studied for a more accurate equivalent circuit parameters determining by solving three pure load parameters´ equations that are closer to the motor´s practical condition as well as by nonlinear regression, and the preliminary study shows that nonlinear regression using auto 2fit maybe more suitable for asynchronous motor´s parameter determining than directly solving three pure load parameters´ equations.