Direct Flux Control (DFC): A New Sensorless Control Method for PMSM

Due to the fact that none of the existing techniques for sensorless rotor position detection of permanent magnet synchronous machines (PMSMs) works for aU speeds, including standstill, a new technique, Direct Flux Control (DFC), is proposed in this paper, which provides a solution to this. The DFC method is based on flux linkage signals, which are measured and utilized to calculate the electrical rotor position. The flux linkage signals can be obtained by simply measuring the different voltage between the machine neutral point and an artificial neutral point during switching pulses. The proposed DFC method has been tested by employing it in both software simulation and hardware implementation. The software simulation environment is a cooperative simulation with Simplorer and Maxwell. Regarding the hardware implementation, the real PMSM and the attached power stack are connected to a TriCore PXROS platform The results are verified through both implementations. Furthermore, the DFC method is analyzed to point out the method configurations and also examine the acquired flux linkage signals and the calculated electrical position characteristics, which strongly confirms the capability of DFC.