The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In order to realize a system that supports human actions timely, the system must have a certain model of human actions. Therefore, we propose a modeling method of human actions. In this method, it is supposed that a person changes his action according to the situation around him, and the causality between the situation around a person and the change of a human action is modeled. This causality is...
This paper presents an observer-based position sensorless control method with signal injection. An extended electromotive force (EEMF) observer is suitable for salient-pole synchronous motors, because position information of EMF and saliency are both included. Signal injection is needed to make use of the position information of saliency at low speed. However, observer consists of a low-pass filter...
This paper proposes a position sensor-less control by reduced-order extended-flux observer applicable to IPMSM with concentrated windings. Generally, the performance of position estimation degrades due to spatial harmonics caused by concentrated windings. This paper realizes position sensorless control using the proposed flux observer, which can suppress influences of inductance spatial harmonics...
This paper presents an analysis of torque ripple caused by current signal injections for sensorless controls at low speed. The torque ripple caused by the injections of signal currents can be represented by a cross product of a virtual flux and a differential current vector. By using the current components parallel to the direction of the virtual flux, signal injection method without torque ripple...
This paper describes a fast torque control system of permanent magnet synchronous motor (PMSM) based on model predictive control (MPC) considering overmodulation region of inverter. In overmodulation region, output voltage of inverter contains harmonic voltage which influences performance of current control and can't be avoided. To consider influences of harmonic voltage, we use a harmonic voltage...
Recently, synchronous reluctance motors (SynRMs) have attracted study because of their favorable properties, including limited thermal expansion of the shaft due to low heat generation by the rotor, the ability to drive at high velocity, a low degree of torque ripple and an absence of demagnetization problems. Sensorless control of SynRMs is now desired, and several methods have been proposed. These...
In this paper, a voltage limiter calculation method for the fast torque response of an interior permanent magnet synchronous motor (IPMSM) when an inverter operates in the overmodulation range is considered. The relation between torque response of an IPMSM and voltage phase angle in the overmodulation range is analyzed, and based on this relation, the optimal voltage limiter calculation method that...
Conventional intelligent systems require humans to acquire knowledge and technique about the systems in order that humans receive their benefits. This means that humans must adapt to the systems. For this problem, it is necessary to realize such systems that can support humans, in other words, the systems that adapt to humans by considering human behaviors. In order to realize this idea, we propose...
This paper describes a fast torque control system of permanent magnet synchronous motor (PMSM) based on model predictive control (MPC). This torque controller selects directly one of the voltage vector of voltage source PWM inverter considering voltage saturation explicitly. To obtain the fast torque response at the transient state and the stable current response at the steady state, the problem with...
This paper presents maximum torque control with inductance settings in extended EMF observers for sensorless controls. The maximum torque control is defined on maximum torque control frame (f-t axes), whose f-axis is parallel to tangential lines of the constant torque curves in the d-q current axes. The angle between f-t axes and d-q axes denoted by ?? is defined as the tangential angles of the constant...
Robot motions are designed according to the properties such as the number of joints, the range of each joint, the length of each frame and so on. Structure changes such as joint failures or frame distortion make the tasks of prepared motions unaccomplished. Identification of structure changes on multi degree-of-freedom (DOF) robots like humanoid is so difficult that the traditional approaches based...
This paper presents a signal injection method without torque variation for the position sensorless control. Proposed method utilizes the maximum torque control frame that makes torque ripple caused by a signal injection minimized. It is proved from the definition of the maximum torque control frame and evaluated by experimental results.
In this paper, torque control scheme for PMSM when an inverter operates in the overmodulation range is proposed and examined. The torque control system has our proposed closed-loop current control system, which harmonic current compensation scheme is used to improve the stability in the overmodulation range. Finally, the overall torque control performance will be evaluated by the experimental results.
For stability of current control system of PMSM in the overmodulation range of an inverter, many harmonic current estimation and compensation methods have been proposed. In these proposed methods, for estimating harmonic currents, the harmonic current models are used, and in these models, parameters of PMSM which are resistance, d and q axis inductances are necessary. The estimation accuracy depends...
This paper describes realization of a fast current control system of permanent magnet synchronous motor (PMSM) based on model predictive control (MPC). This current controller directly selects one of the switching modes of a PWM inverter, while conventional one generates voltage reference regarding an inverter as ideal amplifier. The problem with selecting the switching mode to output is formulated...
Unstable problem of PMSM current control system in the overmodulation range of an inverter is a well known problem, however, the cause and mechanism of this problem are still not investigated well. Actually, the main reasons which are large amount of harmonic components and voltage saturation of an inverter in this range are already known. However, the effects from current controller such as PI controller...
In a sensor network, a lot of distributed sensor nodes observe a certain area or environment, and transmit the observed data to a sink. The observed data sequences may have space- and/or time-dependent correlation. This correlation is regarded as redundant information and can be used for error correction by the joint decoding. In this paper, we propose the joint decoding scheme using the time-dependent...
In this paper, we propose two new voltage calculation methods for fast torque response of IPMSM in voltage saturation region, which are maximum torque response method and constant current response ratio method. Compared with the usual methods, which are constant phase angle method, constant back emf method and constant d-axis voltage method, the proposed methods give faster torque response confirmed...
In this paper, we propose a novel current control system for PMSM when an inverter operates in the overmodulation range. Because of the effect from harmonic components generated from an inverter in this range, an unstable problem in current control system will occur. For solving this problem, the method of harmonic currents compensation is proposed. However, the difficulty in this method is that how...
The focus of this paper is mental tension detection in speech to assist control the tension in day-to-day business such as conferences and operations in a call center. It is difficult to use classical techniques for mental tension detection in day-to-day business because those techniques require invasion body by electrodes or squirts and tied up by cables. In order to achieve a non-invasive, non-contact...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.