Sim, Kyuho Lee, Yong-Bok Jang, Seok-Myeng Kim, Tae Ho 2024-01-20T05:32:15Z 2024-01-20T05:32:15Z 2021-09-03 2015-12 1738-494X https://pubs.kist.re.kr/handle/201004/124688 This paper presents the modeling of mechanical loss in Gas foil bearings (GFBs) that support a Permanent magnet (PM) motor. This paper also presents parametric studies to evaluate the effects of carrier harmonics in the input current and cooling-air supply on the motor thermal performance. Because GFB functions not only as a heat source but also as a thermal resistance, we model it as an equivalent element comprising a thermal conductor. The calculation of the bearing loss from the hydrodynamic analysis shows one-order-ofmagnitude smaller values than the electromagnetic losses, thus indicating a slight effect on the PM motor performance. A case study shows the strong effects of the carrier harmonics and cooling-air supply on the motor thermal performance at a rotor speed of 35 krpm. A further study at an increased speed of 60 krpm shows significant increases in the motor losses and temperatures. English KOREAN SOC MECHANICAL ENGINEERS DESIGN Thermal analysis of high-speed permanent magnet motor with cooling flows supported on gas foil bearings: part II - bearing modeling and case studies Article 10.1007/s12206-015-1149-z 1 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, v.29, no.12, pp.5477 - 5483 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 29 12 5477 5483 scie scopus kci ART002053071 000366368600051 2-s2.0-84949591323 Engineering, Mechanical Engineering Article DESIGN Permanent magnet (PM) motor Gas foil bearings (GFBs) Bearing loss Electromagnetic losses Input current carrier harmonics Cooling Thermal performance