Influence of Driving Voltage on Starting Performance of High-Speed Permanent Magnet Synchronous Starter–Generator for Micro-gas Turbine

The high-speed electrical machine as a critical power conversion unit in the micro gas turbine generation system needs to integrate the functions of starter and generator, which makes the control system of the machine more complex. In order to simplify the control system and improve the starting speed of the generation system with the help of the intrinsic starting ability of the machine, a high-speed starter–generator with multilayer composite solid rotor is proposed. The machine with the proposed solid rotor can realize self-start when it works in starting mode. Taking a 40 kW 20,000r/min high-speed permanent magnet machine as an example, the finite element model of the machine is established. The influence of driving voltage on the machine starting performance is analyzed and the start-up time, locked rotor parameters of the machine under different driving voltages are further studied. Furthermore, in order to reveal the influence mechanism of driving voltage on the machine starting performance, the starting torque is decoupled and the influence of driving voltage on the decoupled torques is studied. Finally, the machine prototype is tested, and the correctness of the finite element model is verified by comparing the experimental data with the finite element calculation data.