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This paper proposes a novel current sensorless drive system with only position sensor for permanent magnet synchronous motor drive in order to reduce costs and avoid problems caused by faults of the current sensor. Generally a pmsm drive controller needs at least two phase-current sensors, in this paper, the current sensors is omitted by replacing estimated stator current with extended kalman filter...
This paper analyses the theory of dead time in Direct Predictive Control, and then proposes a novel dead-time compensation method which can optimize the process of selecting the Voltage Vector by the cost function. The simulation results show that the THD of phase current is decreased and the waveform is improved after using the proposed method, which verifies the analysis and confirms the performance...
This paper proposes an improved Sliding Mode Observer (SMO). Compared with the traditional SMO, it can estimate position and speed information of the rotor more accurately. Its stability is proved by Lyapunov Stability. A control scheme of Permanent Magnet Synchronous Motor (PMSM) under Direct Torque Control (DTC) is designed, using the improved SMO as the feedback of speed information. The results...
The predictive current control algorithm of permanent magnet synchronous motor (PMSM) drives has precise current tracking, constant switching frequency and is suitable for digital implementation. However, the conventional deadbeat predictive current control algorithm is sensitive to the stator inductance parameter mismatch. This paper presents an improved deadbeat predictive current control algorithm...
Efficient manipulation and locomotion skills of a humanoid robot largely depends on the performance of the servo controllers which are used at wrists, elbows, shoulders, ankles, knees, and hip joints. The requirements for humanoid robot joint servo controller include small size, low dissipation, high power density, high response speed and high control precision. Aiming at these technical requirements,...
The dynamic response of the permanent magnet AC servo system is restricted by the bandwidth of current loop, which is the innermost loop. In digital control AC servo system, there are two major limiting factors for current-loop bandwidth, switching frequency and digital delay which means sum of A/D sampling time, algorithm execution time and PWM duty cycle update delay. The bandwidth expansion of...
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