Abstract
The key driving elements for any electrical machine (EM) used in aerospace and other safety critical applications are the reliability, mass, volume, and efficiency. To reduce mass/volume while satisfying the power required, the option is to increase the EM speed. The possible failure of the mechanical bearings at high speed, the higher bearing losses, and the excessive rotor displacement at high speed are some of the design challenges encountered when the speed increases. The main objectives of applying this MSBRM concept is to achieve the magnetic levitation of the rotor to (a) overcome the bearing reliability issues, as well as eliminating the bearing friction, (b) apply online radial force control on the rotor to mitigate the rotor displacement/whirling, and (c) reducing requirements for maintenance and monitoring. In this paper, the multi-sector windings bearing relief electric machine (MSBRM) concept is applied to high torque density permanent magnet EM. The electromagnetic characterization and the radial force control concept of the highly saturated EM has been studied deeply in this paper.
Highlights
The Climate Change Act of the UK government (2008) [1]–[3], aim to reduce UK greenhouse gas emissions by at least 80%, compared to 1990 levels, by 2050
Different sets of the desired mechanical outputs of the electrical machine (EM) have been imported to the radial force control algorithm
It can be note that the average value of the radial forces over one turn has a good agreement with the reference values imported to the control algorithm
Summary
The Climate Change Act of the UK government (2008) [1]–[3], aim to reduce UK greenhouse gas emissions by at least 80%, compared to 1990 levels, by 2050. All the systems conventionally powered by combustion engines, chemical accumulators or fuel cells, will undergo drastic changes to meet the current and future regulations [4]. In accordance with these targets, aircraft industry is seeking for developing more fuel-efficient and environmentally friendly aircraft to alleviate pollution concerns and to comply with the goals of the 2050 strategy. The main target is to push towards more electric aircraft, both hybrid and full electric aircrafts For both generation and propulsion systems, the electric machine requirements are very demanding in terms of power density (40kVA/kg by 2050) [5], speed, efficiency, thermal management, volume, mass, cost, and reliability
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