| The energy storage pulsed alternator is one of the most promising development direction in the application of pulsed high power supplies. In the contemporary pulsed high power sources based on pulsed generator, how to achieve high reliability, high efficiency and high power density energy storage has always drawn a lot of scholars’ attention at home and abroad. Compared with all kinds of energy storage technology, flywheel energy storage systems(FESS), because of its favorable feature of simple principle and easy control, was very suitable for the energy storage pulsed alternator system. Meanwhile, homopolar inductor machines(HIM) will be chosen as the great part in FESS with its advantageous traits such as simple structure, high mechanical strength, high-speed operation ability, large rotational inertia, high efficiency and power density. But in this kind of pulsed high power sources systems, the pulsed generator is usually driven by a prime mover to the set speed and then discharge, which complicates the structure of the system, reduces the density of energy storage and power and lowers the system reliability. In consideration of the above unfavorable factors, this paper researches a homopolar inductor machine as the starter/generator integrated energy storage pulsed alternator.Firstly, this paper selected the homopolar inductor energy storage pulsed machine as research subject. The basic structure and working principle of the inductor machine are analyzed, and then the mathematical model is studied and established. Besides, the analytic calculation method of inductance parameter was given.Based on the research on the working principle and the feature of HIM, using 3-D finite element analytic method(FEM) to compute and simulate the magnetic field distribution of inductor machine. According to the results of 3-D FEM, the machine’s magnetic flux density per pole in different exciting current has been obtained. This paper also proposes two different simplified equivalent 2-D finite-element model which is based on the actual 3-D situation. Then the air-gap flux density, flux linkage and flux distribution of the homopolar inductor machine are analyzed and computed. By the comparison of 2-D and 3-D results obtained above, the simplified equivalent 2-D finite-element model is verified to be feasible.Through theoretical analysis and research about the 3-D finite-element model and simplified 2-D equivalent finite-element model, the homopolar inductor alternator is essentially similar to a salient pole synchronous generator. Its complicated 3-dimensional magnetic field structure can also be analyzed by using the equivalent 2-D salient pole synchronous generator model. This paper studies the motor control method of the HIM based on the simplified 2-D equivalent model, and then establishes the simulative model of HIM’s drive system combining with the mathematical model in MATLAB/Simulink. The system performance is verified by the simulation results.Finally, this paper introduced the basic structure and principle of HIM drive system in detail, and then researched and analyzed the design of hardware and software of the complete drive control system. At the same time, the experimental verification has also been completed. The experimental results show that this drive control strategy can drive HIM running as motor successfully, which achieve the starter/generator integrated control on energy storage pulse alternator and simplifies the whole structure of energy storage pulsed alternator system. |
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