Strategies Of Out-of-Step Fault Symptom Acquisition And Prevention Control For Permanent Magnet Linear Motor

Permanent Magnet Linear Synchronous Motor with multi-segment primary (PMLSM)driven lifting system is oriented, the parameter variation law before the vertical-moving PMLSM begins to be out-of-step, strategies of out-of-step fault symptom acquisition and prevention control are researched. Based on the analysis of the basic structure and working principle of PMLSM multi-segment primary, the relationship equation between power angle and mover position angle is derived, the mover position angle measurement strategy of the salient pole PMLSM is proposed based on high frequency injection method, an analytic equation among high-frequency current-armature inductance-mover position angle is established, and the measurment method of the electrical parameters is established, the mover position angle measurement strategy and its mathematical formula of non-salient pole PMLSM are proposed based on the additional high-frequency windings of mover, out-of-step prevention dual-mode fuzzy control algorithm of PMLSM with multi-segment primary is present, out-of-step protection strategy of PMLSM with multi-segment primary is proposed,the mathematical model of dynamic braking is established, and the dynamic braking characteristics are obtained.