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Based on a nonlinear complete order model of a synchronous motor, a robust sliding mode observer-based control scheme is proposed. To design this scheme, a sliding mode (SM) super-twisting control algorithm and adaptive backstepping technique, are implemented. A nonlinear observer with a 3rd order SM super-twisting algorithm is designed to estimate the rotor fluxes in presence of rotor and stator...
The pole placement control with motion decoupling and integral action, according to the full modal synthesis, is addressed in this paper, to control a 1 kW, 18000 min−1 double conical Bearingless Permanent Magnet Synchronous Motor prototype. An electro-mechanical model of the prototype is derived analytically together with the design of the control scheme. The design of a pole placement scheme, with...
The position sensorless vector control scheme for the brushless excited synchronous motor based on the IGCT converter is presented in this paper. Since the instantaneous excitation current cannot be directly measured in this application, an adaptive rotor position and speed observer, which does not rely on the explicit estimation of the excitation current, is developed for the brushless excited synchronous...
In a conventional ac motor drive using field-oriented control, a dc-link voltage, speed, and at least two current sensors are required. Hence, in the event of sensor failure, the performance of the drive system can be severely compromised. This paper presents a sensor fault-tolerant control strategy for interior permanent-magnet synchronous motor (IPMSM) drives. Three independent observers are proposed...
New method of rotor speed and vector of stator flux linkages identification for doubly fed induction motor was proposed the present paper. This method is based on adaptive system that used full-order observer of electromagnetic processes in induction motor. Results of digital simulation for synthesized algorithm of sensorless vector control are presented.
A adaptive sliding mode observer was proposed for the speed identification of a sensor-less vector control system of doubly fed wind turbine. This strategy combines adaptive control with variable structure control, and selects the rotor currents as model outputs, and formulates a slide mode surface according current error to get speed observer expression. By using small signal model, the convergence...
In order to cancel mechanical sensors in the speed controller system of PMSM, a method of rotor position detection speed/position observation based on active control is proposed. It composed active control strategy of observer according to the error between measured current and observed current, then the rotor's speed/position can be calculated with back-EMF which is estimated. Simulation results...
We address the tracking control problem for sensorless (nonsalient-pole surface) permanent magnet synchronous motors with unknown constant load torque. On the basis of stator current and voltage measurements only and without relying on nonrobust open loop integration of motor dynamics, a novel sixth order nonlinear adaptive control algorithm is designed, which guarantees, under persistency of excitation,...
The present paper describes a new flux-weakening (FW) algorithm for speed control of permanent magnet synchronous machine (PMSM) using a sliding mode observer (SMO) for rotor speed and position estimation. In flux weakening techniques needed to applications requiring constant torque and power operation, the produced torque is depended on the negative d-axis stator current applied to waken the magnetic...
An improved initial rotor position estimation method based on signal injection for position sensorless interior permanent magnet synchronous motor (PMSM) at standstill is presented. In first step, high-frequency rotating voltage signal is injected into stator wingding to obtain magnetic pole position. A PI tracing observer is used to regulate the error signal containing magnetic pole position information...
In the motion control of the sensorless permanent magnet synchronous motor system, the accurate detection of the rotor position at low or zero speed can improve control precision and enhance reliability. In this paper, a sliding mode observer is proposed based on the high frequency signal injection to estimate rotor position of the sensorless permanent magnet synchronous motor. Simulation results...
This paper proposes a sensorless direct torque and flux control system using indirect space vector modulation for matrix converter driven IPM synchronous machine, operating over a wide speed range including standstill. A novel stator flux observer is enhanced by introducing a correction term in the adaptive model, derived from the d-axis current estimation error at high and medium speeds and from...
In order to solve the problem of sensorless PMSM starting, according to the mathematical model of PMSM and electrical steady-state principle, an electrical steady-state model observer of PMSM is built, which is used to estimate the rotor position and speed at low speed in the starting of PMSM. The method in this paper can start the sensorless PMSM stably and has the advantages of low complexity, low...
The application of the slide-mode observer in the sensorless vector-control of permanent magnet synchronous motor (PMSM) is proposed. Design a slide-mode observer to estimate the information of rotor position. Establish the adaptive rule and analysis the stability of the slide-mode observer. The application of the space vector pulse width modulation (SVPWM) is introduced in the control scheme of the...
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