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Voltage reference that contains cross-coupling term between the q- and d-axis is commonly utilized as input of sensorless schemes, and this might cause coupling between speed and position estimation and deteriorate system dynamic performance, which is unacceptable in some applications such as electric vehicle and industrial robot. By employing decoupled voltage reference as observer input, this paper...
This paper is concerned with speed tracking control problem for permanent-magnet synchronous drives (PMSM) in the presence of an variable load torque and unknown model parameters. The disturbance of speed control caused by inaccuracy of model parameters has been investigated. A load torque observer has been proposed to observe the load torque and estimate the disturbance caused by inaccuracy of model...
In most servo motor drive applications, speed control is affected not only by disturbance torque but also by mechanical parameters such as inertia and friction coefficient. This paper presents a new technique for the inertia and friction identification which are based on adaptive identification. The strategy has been simulated and implemented in a drive system. The results demonstrate the high performance...
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