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In general engine generators, the engine and generator are separate units connected by a mechanical coupling. This tends to increase the package size of general engine generators. In this paper, we are able to achieve miniaturization and high output power of the generator by adopting an axial-gap structure through using ferrite permanent magnets. At the same time, the package size is reduced dramatically...
This paper presents a stand-alone ship shaft generator system based on brushless doubly-fed machine (BDFM). In this system, the output voltage amplitude and frequency of BDFM are kept constant under variable rotor speed and load by regulating the control winding (CW) excitation current of BDFM appropriately. The control scheme is proposed, and the hardware design for the control system is developed...
In this paper, different axial gap permanent magnet generators are designed and compared for one of the Caterpillar truck applications. Various axial gap designs with multiple stators and rotors are carried out and compared with a conventional PM generator in terms of torque density, efficiency, loss, heat dissipation, volume, inertia and weight. The results reveal the advantages of axial gap generators...
In order to overcome the excitation problem of the brushless synchronous machine used as starter for engine cranking in the variable frequency starter/generator system, this paper presented a novel three phase open-winding structure of the excitation generator with double inverters for supplying the integrated AC and DC excitation power to the major machine. The control strategies of three-phase AC...
In offshore installations, there is more and more focus on reliability of electrical power to manage safety-related control functions, which must be always available and run all the time. Back-up power systems based on emergency gen-sets are designed to ensure this continuity of operation, even in case of loss of the main electrical power.
The reliability problems associated with transmission or gearbox equipped wind turbines and the existing solutions of using direct drive gearless turbines and torque-splitting, are reviewed. As alternative solutions we propose the Geared Turbofan Engine (GTF) technology, and magnetically-levitated bearings from the aerospace industry, and the consideration of Continuously Variable Transmissions (CVTs)...
An ultra-portable power system driven by a mesoscaled internal combustion swing engine (MICSE) is introduced. The characteristics of a permanent magnet (PM) AC generator operating under oscillatory motion are shown and the velocity profile of the rotor is approximated by a simple mathematical function suitable for use in a FEA simulation. A generator topology is presented and the effects of certain...
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