Sensorless control for buried magnet PMSM based on direct flux control and fuzzy logic

Direct flux control (DFC) is one of the sensorless methods, which is used to acquire the electrical rotor position of permanent magnet synchronous machines (PMSMs) for all speeds. The DFC is implemented on a TriCore PXROS platform, which is connected to the real PMSM. Flux linkage signals are measured to calculate the electrical rotor position by using an approximation function. Due to the weak intensity of the measured flux linkage signals of the buried magnet PMSM, a fuzzy logic is selected as a tool to overcome the mentioned problem. The fuzzy logic is designed based on the flux intensity characteristics, which are recognized by driving the motors. Thus, a flux intensity management (FIM) strategy by fuzzy logic is proposed in this paper to solve the obstacle. Consequently, the buried magnet PMSM electrical rotor positions can be acquired for all speeds by employing the DFC and the FIM methods.