Comparison of two position and speed estimation techniques used in PMSM sensorless vector control
ABSTRACT The paper describes the comparison between two different high-performance techniques used for the sensorless estimation of the motor shaft position in Permanent Magnet Synchronous Motor Sensorless Drives. Rotor position and speed are estimated from measured terminal voltages and currents, and are used as feedback in a sensorless vector control scheme, achieving almost the same high-performance of a sensored drive. The paper point out the differences, by using experimental implementation, between an open-loop flux estimator based on the electrical model of the machine, and a reduced flux observer.
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ABSTRACT: The sensorless vector control method for the high speed Permanent Magnet Synchronous Machine (PMSM) used as integrated starter-generator (ISG) applied in the microturbine generation system (MTG) is investigated in depth in this paper. For its characteristic of high rotating speed and low inductance, an improved open-loop back-EMF estimation method is proposed to estimate the position and velocity of the high speed PMSM. The tracking differentiator is used instead of the classic differentiator to overcome the problem of noise amplification. The variable parameter low-pass filter optimized based on the velocity is adopted to filter the estimated back-EMF. Moreover, the estimation errors caused by the low-pass filter and sampling delay are also compensated. The effects of voltage distortion caused by dead time on the estimation accuracy are weakened by dead-time compensation. Based on the proceeding estimation, the sensorless vector control system for the high speed PMSM used in a 30 kW MTG is designed and implemented. The simulation and experimental results show the proposed sensorless vector control method is simple, practical and possessing good estimation accuracy at large-scale speeds. It can satisfy the requirements in terms of fast and stability during the operation of microtubine generation system, and ensure that the system has good static and dynamic performance.
Conference Paper: Sensorless Control of Permanent Magnet Synchronous Motor[Show abstract] [Hide abstract]
ABSTRACT: Vector control of permanent magnet synchronous machine PMSM is one of the new techniques have been developed in recent years. It's based on the use of measures from the mechanical sensor. In order to reduce the cost and improve the reliability of this variable speed drive, the paper presents a control method without sensor using the estimation of the electromotive force EMF to determine the speed and the position. The resulting algorithm is implemented in embedded dasiaCpsila language on DSP board and tested on 500 W PMSM.Multimedia Computing and Systems, 2009. ICMCS '09. International Conference on; 05/2009
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ABSTRACT: The paper presents a method to estimate the speed and the rotor position of the permanent magnet synchronous motor (PMSM) drive. The development is done using sliding mode theory. The method proposed is based on the model of the PMSM in the stationary reference frame and uses two sliding mode (SM) observers to estimate the variables of interest: the states, the rotor position and the motor speed. A distinct advantage of the proposed approach is that speed is obtained algebraically - some previous speed estimation methods described in the state of the art use adaptation theory; however, this is usually not reliable. In the development, the motor voltages and currents are measured. A first SM observer estimates the EMFs of the PMSM model. Then, these are fed into a second SM observer which estimates the derivatives of the EMFs. The equivalent controls of the two observers are used to compute the speed. The paper discusses some of the approaches available to estimate the speed with known EMFs. The theoretical developments are supported with simulations.Power Electronics and Drive Systems (PEDS), 2013 IEEE 10th International Conference on; 01/2013