Design of Permanent Magnet Hybrid Magnetic Bearing with Minimum Salient Poles

概要

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In order to reduce greenhouse gas emissions, the generation of renewable energy is required. Therefore, this paper focused on a small-sized hydraulic generator, since small scale hydropower has a large potential for power generation. Standard mechanical bearings are installed in conventional small-sized hydraulic generators to support the rotating shaft. However, mechanical ball bearings cause rotational loss, noise and limitation of device durability. In order to upgrade the performance of a hydraulic generator, a new type of permanent magnet hybrid type magnetic bearing is proposed in this study. The stator is designed by finite element method magnetic field analysis. According to the analytical result, by making the root of stator salient pole wider and eliminating magnetic saturation, stronger bearing power was obtained. The analytical attractive force and negative spring force characteristics were then verified under static operation conditions with a simple experimental setup. Moreover, in order to confirm dynamic performance in the time domain, the impulse response was measured with the result showing good performance. In addition, by using the measured coefficient of attractive force and negative spring force, a numerical simulation was carried out to check the dynamic performance in the frequency domain and compared with an experimental result. The result of the frequency response showed good control performance in frequency domain.