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This paper studies a speed sensorless permanent magnet synchronous motor (PMSM) drive system based on the adaptive observer method, analyzes the problem of instability in the low-speed electric mode according to the observer linearization method. To solve this problem, the observer augmented with a signal injection technique is researched. The simulation results show that the method is effective to...
In this paper, the reason for the instability of the full-order flux observer in high speed region is analyzed. The feedback gain matrix is designed to stabilize the discrete system. Simulation results in Saber are presented to validate the efficiency of the proposed method.
In traditional direct torque control (DTC), speed regulator is widely based on conventional proportional integral derivative (PID) controller, which has to depend on precise math model of the subject However, PID cannot easily achieve swift response, small overshooting and fine speed control precision especially in low speed range. This paper introduces a nonlinear control technology-auto disturbance...
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