Feasibility investigation of sinusoidal radial excitation force loading of high-speed motors. (February 2023)

• Record Type: Journal Article
• Authors: Song, Yuchen; Li, Liyi; Cao, Jiwei; Liu, Yuqing
• Is Part Of: Sustainable energy technologies and assessments. Volume 55(2023)
• Publication Date: 2023-02
• Subjects: Cross stiffness -- Dynamic stiffness measurement -- Electromagnetic radial force -- Permanent magnet synchronous generator; Renewable energy sources -- Periodicals; Energy development -- Technological innovations -- Periodicals; Electric power production -- Periodicals; Energy storage -- Periodicals; 333.79
• DOI: 10.1016/j.seta.2022.102980
• Languages: English
• ISSNs: 2213-1388

Abstract

Highlights: Make PMG sense dynamic stiffness of itself, which improves reliability. The proposed device has low loss, high efficiency and compact structure. Cross stiffness is measured, which is suitable for gas bearings in wind turbines. The proposed methods do not need additional rotor angle sensors and reduce costs. Abstract: Permanent magnet generators have been found most suitable for sustainable energy conversion owing to their relatively simple design, compact structure and high efficiency. To utilize high power density of permanent magnets, this paper integrates a novel function in the permanent magnet generators. Continuous monitoring dynamic stiffness of high-speed rotors and safeguarding the rotor from failure is made possible through a compact double winding stator. In this way, the reliability and maintainability of the generator can be improved and the maintenance costs can be reduced. First, models of the double-winding generator as well as the rotor system are established. Second, the needed radial force for dynamic stiffness measurement is investigated, including rotation force vector and constant direction excitation force. Two control methods without rotor angle position feedback, double frequency current injection and sensorless loading method, are discussed. Then, loading capacity of the loading methods and error of dynamic stiffness at different operating frequencies is analyzed. Finally, experiments at different rotation speeds and loading force frequencies are performed. The results verify the feasibility of the loading methods, the prototype can effectively produce a wide frequency range (0.02–2.5 kHz) of radial force while operating at high-speed (up to 60krpm).