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A new dual 3-phase flux-switching permanent magnet (FSPM) machine having 12/11-stator/rotor-pole is proposed and analyzed in this paper. Compared with the conventional 12/11-pole 3-phase FSPM machine, it is analytically deduced that the proposed dual 3-phase machine has better torque characteristics, i.e. higher torque density due to larger distribution factor and smaller torque ripple due to 30 electrical...
This paper presents a fault diagnosis technique for high-resistance connection (HRC) in nine-phase flux switching permanent magnet (FSPM) machine, which is based on zero sequence voltage components (ZSVC). Firstly, a nine-phase FSPM machine topology is introduced and no-load back electromotive force (EMF) waveforms are analyzed. Then the nine-phase FSPM machine with HRC is modeled and the influence...
This paper studies the fault tolerant control schemes for the active neutral-point-clamping three-level (ANPC-3L) inverters under different fault conditions. The fault conditions include the device-level faults in one inverter leg, the inverter-leg faults, and the open-circuit faults in load. The impacts of faults in devices, inverter leg and load on output voltage levels and mid-point voltages of...
Flux-switching permanent magnet (FSPM) machine has attracted wide attention. However, the temperature rise may be a key point in application due to the unique machine structure. In this paper the thermal analysis and cooling design are carried out so as to keep temperature of the machine within the safe range and enhance the reliability. The equivalent thermal network (ETN) is developed to get the...
The dual-stator brushless doubly-fed induction generator-based wind energy conversion system (DSBDFIG-WECS) is promising in future wind energy development due to the merits of compact structure, low cost and high reliability. This paper makes the first attempt to compare the performance of vector control (VC) and direct torque control (DTC) based on the DSBDFIG-WECS. The comprehensive comparison results...
A simple initial rotor position identification method is proposed for surface-mounted permanent magnet synchronous machines (SPMSMs) in this paper. The magnetic saturation of iron core is taken into account and the saturated d-axis current is generated by injecting voltage vector pulses. The space vector pulse width modulation (SVPWM) is used to acquire the voltage vector pulses and an assumed rotor...
Objective Researching a safety management system tool, it can manage airports safety in a high efficient level???Methods Based on B/S structure, It is established that an airport safety management system. It has implemented the daily work of airport safety management and risk management integration. Results The system designs a function framwork, including predictive subsystem, proactive subsystem,...
The study applies Asp.Net Web Service technology to develop network services and technology such as COM-MapObjects and XML to develop client software. Finally, a water resources management decision support system has been developed on the basis of C/S (Client/Server) and ComGIS. The system implements dynamic management, timely updated information about water resources management, visual query, visual...
Detailed crash analyses indicate that poor gap selection, rather than stop sign violation, is the primary causal factor in crashes at rural, unsignalized intersections. To determine under what conditions the gap selection process fails, a transportable rural intersection surveillance system has been designed and implemented. The system can be installed at any rural intersection, and can be used to...
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