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PHEV용 IPMSM의 권선에 따른 고조파 특성에 관한 연구
장익상(Ik-Sang Jang),이기덕(Ki-Doek Kim),김미정(Mi-Jung Kim),손병욱(Byoung-Ook Son),방기창(Ki-Chang Bang),이주(Ju Lee) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Interior permanent magnet synchronous motors(IPMSMs) produce not only the magnetic torque, but also the reluctance torque, which is due to the difference between the d-axis and q-axis inductance, by geometrical rotor structure. Therefore, using flux-weakening control, IPMSMs can be driven at higher speed than surface mount permanent magnet synchronous motors(SPMSMs). As Traction Motors Require wide operation range and high torque density, IPMSMs are suitable for traction applications. In this paper, efficiency and characteristics are compared with concentric and distribute winding.
권중학(Kwon, Joong-Hak),김광석(Kim, Kwang-Suk),방기창(Bang, Ki-Chang),황상문(Hwang, Sang-Moon) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.4
With the advent of mobile phone, digital multimedia broadcasting(DMB) service is to be realized for multimedia data communication. For an acoustic part, a smaller and lighter microspeaker is also soon to be realized as an MP3 song player and a speakerphone. Sound quality in the microspeaker is becoming more important in mobile phones. It is evaluated by total harmonic distortion(THD). THD is the proportion of higher order frequencies output response to sinusoidal input signal. It is affected by uneven magnetic distribution and nonlinear response of diaphragm. In this paper, harmonic distortion is analyzed by considering magnetic and mechanical coupling effects. Simulated results of THD are compared with experimental data. Results show that THD in lower frequency range is higher due to high displace on voice coil and high mechanical response of high order frequency.