Hybrid active flux estimation technique takes advantage of both the voltage model for high-speed operation and current low-speed, which considerably enlarges system operating range. However, accuracy motor parameters, particularly stator resistance, severely impacts robustness this technique, especially at low speeds ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\leq 5$</tex-math></inline-formula> % per...

In this work, we propose a new adaptive-observer-based encoderless control for permanent magnet synchronous motor (PMSM) drives. The proposed solution achieves <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">full</i> speed range operation xmlns:xlink="http://www.w3.org/1999/xlink">without</i> signal injection. To enable and enhance zero- very low-speed with large load, technique drop voltage adaptation law to precisely identify compensate the...

This paper addresses a novel hybrid active flux observer based encoderless control scheme for AC motors. An Extended State Observer (ESO) is used to combine voltage model (VM) and current (CM), stabilizes the critically stable VM. Moreover, an adaptive law designed identify compensate errors caused by inverter nonlinearities. The low-speed operation performance improved via proposed scheme. Experimental results conducted on asynchronous motor verify effectiveness of proposal.

Permanent magnet synchronous motor drives with encoderless control techniques will simplify servo system de-sign, reduce cost, and improve reliability, which has therefore attracted decades of research in both the areas academia industry. Owing to its simple structure reduced application requirements, model-based methods have been widely used. Active flux model based technique shows good robustness thanks low parameter dependence. However, inverter non-linearity, dead time, IGBT voltage drop...

It can generally cause a great pressure surge and noise when the speed of an actuator is quickly changed in large-scale hydraulic system. In this paper, considered as response system to input signal order obtain optimal control for minimum shortest conversion time. The dynamic performance valve controlled cylinder studied described by space state equations, obtained simplex method 3 indices. microprocessor used test results numerical computer simulation experimental are similar. also shows...

This paper presents a general description of the mode coupling in optical waveguide containing magnetostatic forward volume wave(MSFVW). The power-conversion efficiency TEI-TMm modes have been obtained for several kinds 1/m, which are corresponding to different center frequency. multi-band modulator has predicted and advantage modulation by MSFVW over MSSW discussed.

The hydraulic servo control system is widely used in electrode of electric-arc furnace. But the mathematical model and dynamic performance such a are not researched detail. In this papers by analyzing system, 7th order for established its ramp-step response calculated numerical simulation.

A sensor is proposed for measuring the displacement of a moving part in hydraulic system. Magnetosensitive resistance used as sensing element; measured reflected by variation magnetic field and sensed magnetosensitive resistance. The element thin film with strong magnetism. It very sensitive not only to intensity but also change direction field. has high sensitivity good temperature characteristic. relationship between output voltage linear making compensation easy.

This paper proposes a new control scheme for the electrode servo system in an electricarc furnace. The cylinder is controlled by valve along with two on-off valves. optimal opening and closing time of valves determined principle optimality. can protect zero velocity acceleration at stopping point as well minimum response time. By this kind control, gives fast high position accuracy under small disturbance provides impact following large disturbace. Experiment digital simulation are carried...

Commande optimale d'un cylindre hydraulique commande par une soupape (optimisation dans le cas changement rapide de vitesse)

Abstract Combining with the failure analysis of a class import motor-driven devices valve and design new kinds, several problems worth noticing in have been discussed. These are redesign changeover mechanism between manual operating motor driving, setting way for opening, reform measurement transmission selections parameters about velocity force device. Based on these analyses, redesigned successfully applied industry. The conclusions obtained certain referential values to related research.

In view of the large time delay temperature control system hydraulic system, a self-learning cerebellar model articulation controller (CMAC) algorithm is proposed to cooling system. The precision exceeds Grade A ISO standard (50/spl plusmn/1/spl deg/C) and reaches level 50/spl plusmn/0.5/spl deg/C. composed digital proportional controllers in hybrid form. This can increase precision. Considering speciality an inverse dynamics different from one commonly used established. computing speed CMAC...

Abstract Based on PWM (Pulse Width Modules) theory, this paper proposes a controlled cooling system by using the on-off water value, cost of is decreased and reliability improved. Moreover, self-learning control algorithm for nonlinear with large time-delay taking advantage MNN (Memmory Neuron Network), it used in oil temperature hydraulic system, result satisfactory, has been within 50±0.5 °C.

Abstract A new kind of neural network based on RBFN and CMAC is proposed in this paper. The learning speed very fast so that it can be used to identify the hydraulic servo system line. model structure for identification with large alternating disturbance also simulation results are satisfactory.