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.
To improve the performance of a proton exchange membrane fuel cell (PEMFC) stack, it is important to avoid the hydrogen and oxygen/air starvation of electrochemical reaction, prevent the dehydration and drying of the membrane, and track the output power. This paper conducts research in a comprehensive control strategy of the operation parameters of an uninterruptible power system (UPS) with backup...
With the wide application of permanent magnet synchronous motors (PMSMs), particularly the surface mounted type, the limitations of the conventional PMSM model have become apparent, in which no saturation saliency is incorporated. As a result, the numerical simulation is not applicable for the initial rotor position estimation, which is vital for sensorless motor operation. To avoid the difficulty...
Recently research and development concerning applications of high temperature superconducting (HTS) transformers have been progressed actively in the world. Besides the HTS rated current capability, it is also essential to develop the relevant and precise performance test and protection systems for HTS transformers. This paper mainly presents elementary test and protection methods of HTS transformers...
The paper introduces the basic principle of space vector pulse width modulation simply and expatiates a method for implementing space vector pulse width modulation in detail based on MATLAB/SIMULINK, designs modeling and simulation of AC servo system with PMSM (permanent magnet synchronous motor), the simulation results show that the model is effective, and the method provides a base for both software...
High temperature superconductor (HTS) bulk can produce strong levitation force and has attracted strong interest of application in maglev transportation systems, to which a linear motion drive has advantages to be incorporated. This paper presents the design and performance analysis of a linear synchronous motor drive for a levitated object by HTS bulks. The analysis results show that the developed...
This paper presents a control strategy suitable for hydrogen/air proton-exchange membrane fuel cells (PEMFCs), based on the process modeling using fuzzy logic. The control approach is tested using a PEMFC stack consisting of 32 cells with parallel channels. An optimal fuzzy-PI controller is designed to mainly control the hydrogen and air/oxygen mass flows, and auxiliary variables such as the temperature,...
This paper presents an improved phase variable model and field-circuit coupling method for the design and performance analysis of a high speed surface mounted permanent magnet brushless DC motor. In the design of the motor, magnetic field finite element analysis is conducted to calculate the key motor parameters such as the air gap flux, back electromotive force, and inductance, etc. Based on the...
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.