WORKS
FY2022
| Project Name | Characterization of a prototype Halbach motor |
|---|---|
| Progress status and Results summary | In the ‘Creating Industry through Research and Development of Compact and Lightweight Electrification Systems’ project, which Akita Prefectural Government applied for with the participation of Akita University, was approved by the Cabinet Office, the characteristics of the prototype Halbach motor (maximum output 250 kW) were tested. |
| Results | See below Succeeded in developing a prototype high-power aircraft propulsion motor (Halbach motor). |
※Halbach motor（Photo from the side, with cover）
※Halbach motor（Front view photo, no cover）
| Project Name | Research and development on control design of redundant electric fuel metering system |
|---|---|
| Progress status and Results summary | A redundant electric fuel metering system has been devised as a research and development for the electrification of aircraft fuel systems. In this system, the fuel pump is directly driven by an electric motor, and the electric fuel pumps are configured in parallel and redundantly to improve reliability [Result 1]. We study the redundant control function of this system and aim to build a basic theory for application technology of high-performance electric motors. In addition, we also aim to evaluate and verify fault tolerance performance as a redundant configuration. So far, to build a nonlinear model of the system, we have devised a method of modeling the nonlinear characteristics by adding a limiter for the flow rate increase to the linear model obtained by system identification, and We confirmed that the simulation results agree well with the experimental results [Result 2]. Currently, we are working on the fault-tolerant control design of the system with the optimized control system and the construction of an estimation model for improving the control accuracy. |
| Results | [Result 1] N. Morioka, H. Oyori, N. Seki, T. Fukuda et al.： “Thermal management system for the MEE and Engine embedded electric machine” ，ASME GT2018-76356，（2018） [Result 2] Y. Yamamoto, Y. Shibuya, H. Oyori, and M. Muraoka.： “Control Design under Limitation of Motor Current for Electric Fuel Metering System with Redundancy on Aircraft Electrification”,SAE 2023-01-0987，（2023） |
※ Redundant Electric Fuel Metering System(EFMS)
（Quoted from Result1）
※ The nonlinear Redundant EFMS model with the flow command increment limiter（Quoted from Result 2）
| Project Name | The study of thermal air management system for aircraft air conditioning system |
|---|---|
| Progress status and Results summary | In recent years, the trend for Net Zero in the aviation industry has accelerated, and many R&D efforts are conducted to reduce fuel consumption. In aircraft systems, the air conditioning system is a major energy consumer, and the energy is the compressed air produced by the jet engine. However, using that energy for the air conditioning system reduces the efficiency of the jet engine. We are developing a thermal air management system which improves the efficiency by using an electric turbocharger integrated with an electric compressor and a turbine. The electric compressor supplies compressed air instead of a jet engine, and the turbine recovers the energy of the compressed air and the heat from passengers and avionics. In FY2022, we built a sub-scale ground test rig with a reduced flow rate to confirm the system feasibility and demonstrated tests simulating cruise conditions. Currently, we are evaluating the test results and considering the test conditions for an operational feasibility study. This article is based on results obtained from a project, JPNP15005, commissioned by the New Energy and Industrial Technology Development Organization (NEDO). |
| Results | None |
※Conceptual diagram of the thermal air management experimental system
※The thermal air management experimental system