Analytical method for starting performance calculation of induction motors considering skin effect and leakage flux saturation

Due to skin effect and of the leakage flux saturation, the stator and rotor leakage impedance parameters of cage induction motors are variable in start process, which may cause the changes in electromotive force and affect the calculation accuracy of starting performance. In order to accurately calculate the induction motor starting performance with the above factors considered, this paper establishes a new analytical model, in which the dynamic variation of the parameters, such as stator leakage, rotor leakage and rotor resistance can be considered effectively. Then, taking YKK710-4 3150kW motor as an example, the starting current, starting torque and speed performance are contrastive analyzed. The results show that the leakage reactance is smaller and the starting current increase and starting response is faster.