多因素耦合影响下SPLIM等效电磁参数计算OA

The short primary linear induction motor(SPLIM)contains both longitudinal dynamic end effect and core saturation effect during operation,and its equivalent electromagnetic parameters are difficult to be calculated accurately by the traditional analytical method due to the mutual coupling and nonlinear influence of these two effects.To this end,the analytical calculation method of the equivalent electromagnetic parameters of SPLIM under the influence of multi-factor coupling was proposed.Firstly,the improved equivalent circuit of SPLIM under the influence of multi-factor coupling was analyzed.Secondly,the one-dimensional electromagnetic field model of SPLIM and the magnetic circuit considering the core reluctance were established,and the differential equations of the air-gap flux density containing the speed factor and core permeability were derived according to Ampère's circuital law.The air-gap flux density at each position was calculated by the iterative method and the core magnetization curves.Next,the excitation inductance and secondary resistance under different operating conditions were calculated according to the magnetic chain method and the equivalent loss method,respectively.Finally,a transient field simulation model of SPLIM was established in ANSYS Maxwell.Results reveal that the maximum error between the analytical results for excitation inductance and the finite element results is 6.8％,while the maximum error between the analytical results for secondary resistance and the finite element results is 6.4％.The thrust calculated based on equivalent parameters is in good agreement with the experimental data,further validating the accuracy of the proposed analytical method.