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T. Kosaka,C. Higashihama,T. Ishihara,H. Matsumori,N. Matsui 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
This paper presents design study on a lightweight quasi-coreless surface permanent magnet synchronous motor (SPMSM) employing Carbon Fiber Reinforced Plastics (CFRP) as the stator body to make it lighter. Stator body is composed of CFRP, a little soft magnetic composites core and aluminum winding for high power density. The design procedure for lightening the quasi-coreless SPMSM and experimental drive performance evaluation results are reported. Finally, remaining issues which have been founded are discussed.
Experimental Studies on Drive Performances of Less Rare-Earth PM Hybrid Excitation Motor
T. Kosaka,T. Hirose,N. Matsui 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents feasibility studies on hybrid excitation motor (HEM) as a candidate of less rare-earth permanent magnet and high power density machine for hybrid electric vehicle drives. The construction, the basic working principle focusing on variable field control capability and the design concept of HEM are overviewed. After making the design restrictions and specifications clear, the drive performances of HEM designed are evaluated based on 3D-FEA. As a result, the proposed motor makes possible to reduce the volume of rare permanent magnet by approximately half of that used in existing interior permanent magnet synchronous motor for LEXUS RX400h while keeping the power density intact. With comparisons between the measured and the computed drive performances of the trial manufacturing of the downsized motor, it is verified that HEM becomes an attractive candidate as a less-rare-earth permanent magnet and high power density motor for HEV drives.
E. Sulaiman,T. Kosaka,N. Matsui 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Hybrid excitation flux switching synchronous machine (HEFSSM) has several attractive features compared to interior permanent magnet synchronous machines (IPMSM) conventionally employed in hybrid electric vehicles (HEV). Among various types of HEFSSM, the machine with both permanent magnet (PM) and field excitation coil (FEC) on the stator has the advantages of robust rotor structure together with variable flux control capabilities that make this machine becoming more attractive to apply for high-speed motor drive systems. This paper presents an investigation into the design possibility and parameter optimization study of 12Slot-10Pole HEFSSM for traction drives in HEV. The research target is to design a machine with reduced amount of rare-earth magnet, a maximum torque of 210Nm, a maximum power of more than 123㎾, and a maximum power density of more than 3.5㎾/㎏. Extensions in speed and torque ranges are chosen for optimization aims. The deterministic design approach is used to treat ten design parameters in an effort to achieve the target performances. As a result, the designed HEFSSM with 0.4㎏ PM is able to get much higher power density compared to existing IPMSM installed on a commercial SUV-HEV.
M. Sridharbabu,T. Kosaka,N. Matsui 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents design analysis and improvement of the proposed high speed hybrid excitation motor (HEM) for main spindle drive in machine tools based on experimental results obtained using prototype motor. The proposed HEM is intentionally designed using 3D-FEA for target application taking into account of practical design constraints. The basic working principle and the unique field weakening control method of the proposed HEM are studied from the prototype machine. The influence of manufacturing constraints in the design parameters of the motor are studied carefully and an improved design of the proposed HEM is analyzed. In particular, the induced voltage distortion, magnetic flux saturation in the stator pole shoe have been a major factor which has impact in the performance of the test machine, are considered in the improvement of machine design.
Goto, K.,Kajihara, Y.,Kosaka, S.,Koba, M.,Nakanishi, Y.,Ogawa, K.,Oku, T.,Fujiyama, M.,Yoshida, Y. Asian Australasian Association of Animal Productio 1989 Animal Bioscience Vol.2 No.4
Bovine blastocysts were obtained by totally in-vitro technique and then transferred to recipient cows. Total of 15 calves (including 4 premature calves) were obtained from 11 recipients. Four calves were obtained from the transfers of fresh blastocysts and 9 calves were obtained from the transfers of frozen-thawed blastocysts. Two calves were obtained from the bisected fresh blastocyst. The males and 5 females were delivered. Birth weight of calves was within normal range except one female, and all calves appeared to be completely normal.
M. Z. Ahmad,E. Sulaiman,T. Kosaka 한국자기학회 2015 Journal of Magnetics Vol.20 No.3
In recent years, flux switching machines (FSMs) have been an attractive research topic owing to their tremendous advantages of robust rotor structure, high torque, and high power capability suitable for intensive applications. However, most of the investigations are focusing on the inner-rotor structure, which is incongruous for direct drive applications. In this study, high torque and power densities of a new 12S-14P outer-rotor permanent magnet (PM) FSM with a DC excitation coil was investigated based on two-dimensional finite element analysis for in-wheel direct drive electric vehicle (EV). Based on some design restrictions and specifications, design refinements were conducted on the original design machine by using the deterministic optimization approach. With only 1.0 kg PM, the final design machine achieved the maximum torque and power densities of 12.4 Nm/kg and 5.93 kW/kg, respectively, slightly better than the inner-rotor HEFSM and interior PM synchronous machine design for EV.