Abstract
In general, high-speed machines should be designed to satisfy electromagnetic and mechanical characteristics. In this study, the design of high-speed permanent magnet synchronous generator with two different shaft materials considering overhang effect and mechanical characteristics was performed. It was confirmed that the leakage magnetic flux generated by the two shaft materials electromagnetically affects the high-speed generator. Additionally, it is important to accurately predict the natural frequency mode and critical speed to prevent damage and vibration of the rotating body owing to scattering during high-speed rotation. Therefore, the mechanical characteristics of the designed model were analyzed. In this study, we propose a design method that considers both the electromagnetic effects and mechanical characteristics. Subsequently, verification was performed through experiments and comparisons for the validity and reliability of the proposed design method.
Highlights
With the advancement of manufacturing technologies, permanent magnet (PM) machines are widely adopted in various industrial fields, such as machines using PMs with high coercive force and residual magnetic flux density
After considering the electromagnetic characteristics of permanent magnet synchronous generator (PMSG) with Inconel 718 shaft material, mechanical characteristics analysis was performed using the same method as that for PMSG constructed with STS420-J2 material
Through heat treatment of the rotor, the paramagnetic characteristics of STS420-J2 were transformed into ferromagnetic characteristics, and the magnetic flux leaked to the shaft, increasing the leakage inductance
Summary
With the advancement of manufacturing technologies, permanent magnet (PM) machines are widely adopted in various industrial fields, such as machines using PMs with high coercive force and residual magnetic flux density. Machines rotating at high speed have the advantage of miniaturization and cost reduction through the application of a direct-drive system connected directly to the shaft of an electric machine without using a gear system [1,2,3,4,5]. It has the advantage of high device output and efficiency according to the power conversion device development [6,7]. The choice of the shaft material has a significant influence on the electromagnetic and mechanical characteristics of high-speed machines [8]
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