1,386 research outputs found
Synchronous Motor Observability Study and an Improved Zero-speed Position Estimation Design
International audienceThis paper deals with the Permanent Magnet Synchronous Motor (PMSM) observability analysis for sensorless control design. The problem of loss of observability at low frequency range is always recognized in experimental settings. Nevertheless, there are no sufficient theoretical observability analyses for the PMSM. In the literature, only the sufficient observability condition has been presented. Therefore, the current work is aimed especially to the necessary observability condition analysis. Furthermore, an Estimator/Observer Swapping system is designed here for the surface Permanent Magnet SynchronousMotor (PMSM) to overcome position observability problems at zero speed which is an unobservable state point
Local weak observability conditions of sensorless AC drives
Alternating current (AC) electrical drive control without mechanical sensors
is an active research topic. This paper studies the observability of both
induction machine and synchronous machine sensorless drives. Observer-based
sensorless techniques are known for their deteriorated performance in some
operating conditions. An observability analysis of the machines helps
understanding (and improving) the observer's behavior in the aforementioned
conditions.Comment: arXiv admin note: text overlap with arXiv:1512.0366
Observability analysis of sensorless synchronous machine drives
This paper studies the local observability of synchronous machines using a
unified approach. Recently, motion sensorless control of electrical drives has
gained high interest. The main challenge for such a technology is the poor
performance in some operation conditions. One interesting theory that helps
understanding the origin of this problem is the observability analysis of
nonlinear systems. In this paper, the observability of the wound-rotor
synchronous machine is studied. The results are extended to other synchronous
machines, adopting a unified analysis. Furthermore, a high-frequency
injection-based technique is proposed to enhance the sensorless operation of
the wound-rotor synchronous machine at standstill
Signal injection and averaging for position estimation of Permanent-Magnet Synchronous Motors
Sensorless control of Permanent-Magnet Synchronous Motors at low velocity
remains a challenging task. A now well-established method consists in injecting
a high-frequency signal and use the rotor saliency, both geometric and
magnetic-saturation induced. This paper proposes a clear and original analysis
based on second-order averaging of how to recover the position information from
signal injection; this analysis blends well with a general model of magnetic
saturation. It also experimentally demonstrates the relevance for position
estimation of a simple parametric saturation model recently introduced by the
authors
The generation of dual wavelength pulse fiber laser using fiber bragg grating
A stable simple generation of dual wavelength pulse fiber laser on experimental method is proposed and demonstrated by using Figure eight circuit diagram. The generation of dual wavelength pulse fiber laser was proposed using fiber Bragg gratings (FBGs) with two different central wavelengths which are 1550 nm and 1560 nm. At 600 mA (27.78 dBm) of laser diode, the stability of dual wavelength pulse fiber laser appears on 1550 nm and 1560 nm with the respective peak powers of -54.03 dBm and -58.00 dBm. The wavelength spacing of the spectrum is about 10 nm while the signal noise to ratio (SNR) for both peaks are about 8.23 dBm and 9.67 dBm. In addition, the repetition rate is 2.878 MHz with corresponding pulse spacing of about 0.5 ÎŒs, is recorded
Design of an easy tunable soft sensor for real-time speed and position estimation of PMSM
Volume 4 Issue 2 (February 2016
Adaptive Non-Linear High Gain Observer Based Sensorless Speed Estimation of an Induction Motor
International audienc
Application of homogeneous observers with variable exponent to a mechatronic system
International audiencePreventive maintenance becomes nowadays more and more essential in many industrial applications. In fact, researchers are always looking for new techniques and analysis tools to monitor the dynamic behavior of their machines. In this context, firstly, we deal with the modeling of an electromechanical system which is accounted for by a hybrid model obtained by assembling the mechanical model of a gear element and the electrical model of an asynchronous motor. Secondly, we use Sliding Mode Observers to supervise the gear dynamic behavior. The observers parameters are suitably chosen to ensure rapid and accurate convergence between the real and the estimated system quantities. Finally, a comparative study between three simulations is presented in order to illustrate the observers performances and the influence of the mechanical dynamics on the electrical ones
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