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Career perspectives are known to motivate software engineers. However, so far, career perspectives have been mostly studied within traditional software development companies. In our work we take a complementary approach and study career paths of open source developers, focusing on their advancement through the code review hierarchy, from developers to reviewers and further to core reviewers.To gain...
In this paper, a dead-beat direct torque and flux control with a novel sliding-mode stator flux observer is proposed for electric vehicle (EV) drives. Compared to the direct torque control, the proposed scheme exhibits both static and dynamic performances. Since the system parameters have impact on the control effect of the permanent magnet synchronous motor (PMSM) deadbeat-direct torque control (DB-DTC)...
To improve the performance of an open winding interior permanent magnet synchronous motor (IPMSM) drive system, a space vector modulation based direct torque control (SVM DTC) strategy combined with Maximum Torque per Ampere (MTPA) concept is proposed in this paper. The MTPA trajectories are analyzed in rotor voltage frame, and then combined with SVM DTC in torque flux linkage frame. An imaginary...
For the continuous infinite horizon time-invariant linear quadratic regulator problem (LQR), in the paper, the optimal state feedback controller based on the estimated state of the observer can be decoupled by the proposed approach which resulting one continuous time algebraic Riccati equation (CARE) for the controller design and one matrix equality equation (MEE) for the observer design. A coupling...
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