Characteristics of inductance parameters and thrust linear modeling of PMLSM with combinational iron-cored primary

The performance of motion control on a PMLSM is greatly affected by nonlinearities caused by thrust ripple. The approach of combinational iron-cored primary suggests a thrust ripple-free PMLSM. This paper investigates inductance parameter characteristics and thrust linear modeling of the PMLSM with combinational iron-cored primary. Inductance parameters are derived based on parameters of its armature modular, and symmetric and constant value characteristic of parameters is verified. Based on parameters property of the PMLSM, a thrust linear model is suggested. In comparison with a conventional PMLSM, the PMLSM resolves coupling of inductance parameters between d-axis and q-axis by Parks transformation, and a linear thrust model with a simple lumped parameter is achieved. The validation of the model is verified by simulation of finite-element method. The research predicts that a linear thrust model can be applied to implement a reliable, high efficiency and high performance control of PMLSM.