Multiphysics analysis of high‐speed permanent magnet generators for waste heat application

Abstract

In the direct drive waste heat power system, the turbine is directly connected to high-speed permanent magnet generators (HSPMGs), and the transmission efficiency, service life and system volume can be obviously improved by removing the gearbox and screw rod. However, in the design of high-speed electrical machines, a comprehensive multiphysics analysis must be conducted in order to meet various requirements of electromagnetic, mechanical and thermal specifications simultaneously. The design of one HSPMG by the multiphysics approach for the electromagnetic and loss characteristics, rotor stress, rotor dynamics and fluid-thermal parameters, which satisfies all specified multiphysics constraints, is presented. The theoretical results are confirmed by the experimental results on a prototype in terms of electromagnetic, mechanical and thermal characteristics, such as induced voltage, load current, rotor continuous operation and temperature distribution.

Comprehensive Comparison of a High-Speed Permanent Magnet Synchronous Motor Considering Rotor Length–Diameter Ratio

“…In recent years, with the development of electronic devices, high-speed permanent magnet machines (HSPMMs) access industry and life more and more widely, because of their excellent electromagnetic performance and simple control characteristics [1][2][3]. However, when the HSPMMs rotate at high speed, various problems occur, which hinder the development of HSPMMs, and solving these problems has become a research focus and hot spot for researchers [4][5][6].…”

Multi‐objective optimisation of the HSPMM rotor based on the multi‐physics surrogate model

“…High-speed permanent magnetic machine (HSPMM) is gaining popularity in the industry due to its high power density, compact size, small rotating inertia, and rapid response capability [1,2]. It has been extensively used in applications such as electric vehicles, high-speed railways, air compressors, gas turbines, flywheels, and so on [3,4].…”