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Permanent-magnet synchronous-motor is a multi-variable, non-linear, strong coupling system that is highly sensitive to the outer interfere and inter perturbation. To improve the system robustness, the non-linear mapping is built based on the properties of local time frequency characteristics, zooming index, adaptive study, strong robustness and non-linear approaching of wavelet neural network. By...
This paper presents a new sensorless speed and position estimation method for salient-pole Permanent Magnet Synchronous Motor (PMSM) based on a new mathematical model. All the system variables are expressed in a γδ estimated rotating reference frame. The modified back Electromotive Force (EMF) observer estimates the rotor speed and position utilizing the equivalent control signals of a sliding mode...
A Robust Current-Loop Controller (RCLC) based on the theory of Sliding Model Control (SMC) for Permanent Magnet Synchronous Motors (PMSMs) is proposed in this paper. The Field Oriented Control (FOC) scheme for PMSMs drive is constructed to achieve the better performance. Meanwhile in order to damp the chattering brought by the basic principle of SMC, three ways are presented, which can ensure the...
In this paper, a robust MIMO output control law for Permanent Magnet Synchronous Machines (PMSM) is considered. The nonlinear model of the motor is presented, and a control strategy is proposed, based on high order sliding manifold dynamic output control concepts. A rigorous proof of the stability is presented, based on nonlinear Lyapunov theory and fuzzy mathematics tools (although the controller...
The paper studies sliding mode variable structure control system for a novel gearless windlass balance oil pumping unit (GWBOPU) driven by low-speed and high-torque permanent magnet synchronous motor (PMSM). By analyzing the correlative relationships of the motor and the load, a mathematics model for GWBOPU is established. Base on this model, a speed sliding mode controller is designed by regarding...
A nonlinear speed controller for permanent magnet synchronous motor (PMSM) was designed to achieve speed tracing control and robust adaptive control. The proposed strategy was composed of nominal model method, backstepping control, sliding mode approach and RBF network approach. The controller included two parts: the model controller and the robust controller. The former was designed to ensure a desired...
Conventional PI regular is a simple control method that is widely applied in permanent magnet synchronous motor (PMSM) control systems. However, in most cases, it cannot meet the requirements of high performance control. In order to improve system robustness and response, this paper adopts sliding mode variable structure control strategy in the design of a double-loop controller (speed loop and current...
In this paper, a sliding mode control based on reaching law control (RLC) is proposed for permanent magnet synchronous motors (PMSM) drive system. The PMSM is a typical multi-variable nonlinear system with strong coupling. It is sensitive to load disturbances and changes of interior parameters, so conventional PID control can't meet the application requirements where high performance is required....
One of the disadvantages of permanent magnet synchronous motors (PMSM) is the output torque ripples which degrade the performance of the system. Actual torque feedback to the system reduces output torque ripple but increases costs through the use of a torque transducer. Thus, a torque estimator which can provide accurate instantaneous torque feedback to the system will be highly desirable. However,...
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