2005 Fiscal Year Final Research Report Summary
Study on Ultra High-Speed Electric Drive of Automotive Turbocharger to Improve Environmental Compatibility and Drive Performance
| Project/Area Number |
16360137
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
電力工学・電気機器工学
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
NOGUCHI Toshihiko Nagaoka University of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10237828)
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| Co-Investigator(Kenkyū-buntansha) |
SAITO Kazuo Nagaoka University of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (10143827)
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| Project Period (FY) |
2004 – 2005
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| Keywords | Ultra High-Speed Motor Drive / Turbocharger / Supercharger / Pseudo Current-Source Inverter / Rare Earth Permanent Magnet / Magnetic Field Analysis / Combustion Engine / Energy Saving |
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| Research Abstract |
During the financial support by this research project (fiscal year 2004-2005), grant-in-aid for scientific research, Ultra High-Speed Electric Drive of Automotive Turbocharger to Improve Environmental Compatibility and Drive Performance were studied and the following knowledge and results were obtained :
(1) Development of Ultra High-Speed Electric Drive for Turbocharger
A prototype of an ultra high-speed permanent-magnet motor/generator for an electrically assisted turbocharger was developed. 6-slot concentrated winding structure was employed in the stator core, which was made of 0.15-mm super thin electromagnetic steel plates. The rotor was composed with a cylindrical Neodymium permanent-magnet, which was reinforced with a carbon fiber and a metal alloy sleeve. This ultra high-speed machine was fed by a pseudo current-source inverter with 72-V DC bus voltage, and the inverter power circuit and its drive circuit were implemented with a 4-layer large-current printed wire board. From expe
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rimental results of the system, regenerative power of 1.3 kW at 120,000 r/min was confirmed and inverter output power of 2.2 kW at 220,000 r/min was obtained in a motoring operation. In addition, turbo lag was improved by 45 % compared with a conventional mechanical turbocharger, using this electrically assisted system.
(2) Development of Ultra High-Speed Electric Drive for Supercharger
A prototype of an electrically driven supercharger was developed, which employed an ultra high-speed permanent-magnet motor. The motor has three-slot stator core structure with concentrated windings and Samarium-Cobalt permanent-magnet on the rotor. A pseudo current-source inverter was used to drive the motor as well as an electrically assisted turbocharger. As a result of experimental tests, 2.7-kW inverter output power was confirmed at 160,000 r/min and boost pressure response (turbo lag) was shortened to 0.5 s.
(3) Efficiency Measurement and Losses Analysis of Ultra High-Speed Motor
A motor-generator set composed with 2 ultra high-speed permanent-magnet motors was set up on the basis of the electrically driven supercharger. As a result of motor operation using this experimental setup, the maximum efficiency and the power factor was 79 % and 62 %, respectively. Also, it was found from FEM based losses analysis that eddy-current loss on the permanent-magnet was dominant and 38 % of the total loss. Less
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Research Products
(14 results)
