Dead-Time Correction Applied for Extended Flux-Based Sensorless Control of Assisted PMSMs in Electric Vehicles

Sensorless control technology of PMSMs is great importance for safety and reliability in electric vehicles. Among all existing methods, only the extended flux-based method has performance over speed range. However, accuracy flux rotor position observer are greatly affected by dead-time effect. In this paper, adopted to develop a sensorless system. The influence effect on analyzed correction specially designed guarantee whole A comparison estimation precision among method, electromotive force (EMF)-based high frequency signal injection given simulations. proposed system verified experiments. experimental results show that with satisfactory full range both loaded non-loaded situations. error within 4% working conditions. improves effectively.